/*
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Copyright(c) 2017 Intel Corporation.
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#ifndef PSM2_MQ_H
#define PSM2_MQ_H
#include <psm2.h>
#ifdef __cplusplus
extern "C" {
#endif
/*!
* @file psm2_mq.h
* @brief PSM2 Matched Queues
*
* @page psm2_mq Matched Queues interface
*
* The Matched Queues (MQ) interface implements a queue-based communication
* model with the distinction that queue message consumers use a 3-tuple of
* metadata to match incoming messages against a list of preposted receive
* buffers. These semantics are consistent with those presented by MPI-1.2
* and all the features and side-effects of Message-Passing find their way into
* Matched Queues. There is currently a single MQ context,
* If need be, MQs may expose a function to allocate more than
* one MQ context in the future. Since an MQ is implicitly bound to a locally
* opened endpoint, handle all MQ functions use an MQ handle instead of an EP
* handle as a communication context.
*
* @section tagmatch MQ Tag Matching
*
* A successful MQ tag match requires an endpoint address (@ref psm2_epaddr_t)
* and a 3-tuple of tag objects. Two of the tag objects are provided by the
* receiver when posting a receive buffer (@ref psm2_mq_irecv) and the last is
* provided by the sender as part of every message sent (@ref psm2_mq_send and
* @ref psm2_mq_isend). Since MQ is a receiver-directed communication model,
* the tag matching done at the receiver involves matching the sent message's
* origin and send tag (@c stag) with the source endpointer address, tag (@c
* rtag), and tag selector (@c rtagsel) attached to every preposted receive
* buffer. The incoming @c stag is compared to the posted @c rtag but only for
* significant bits set to @c 1 in the @c rtagsel. The @c rtagsel can be used
* to mask off parts (or even all) of the bitwise comparison between sender and
* receiver tags. A successful match causes the message to be received into
* the buffer with which the tag is matched. If the incoming message is too
* large, it is truncated to the size of the posted receive buffer. The
* bitwise operation corresponding to a successful match and receipt of an
* expected message amounts to the following expression evaluating as true:
*
* @verbatim ((stag ^ rtag) & rtagsel) == 0 @endverbatim
*
* It is up to the user to encode (pack) into the 64-bit unsigned
* integers, including employing the @c rtagsel tag selector as a method to
* wildcart part or all of the bits significant in the tag matching operation.
* For example, MPI uses triple based on context (MPI communicator), source
* rank, send tag. The following code example shows how the triple can be
* packed into 64 bits:
*
* @code{.c}
//
// 64-bit send tag formed by packing the triple:
//
// ( context_id_16bits | source_rank_16bits | send_tag_32bits )
//
stag = ( (((context_id)&0xffffULL)<<48)| \
(((source_rank)&0xffffULL)<<32)| \
(((send_tag)&0xffffffffULL)) );
@endcode
*
* Similarly, the receiver applies the @c rtag matching bits and @c rtagsel
* masking bits against a list of send tags and returns the first successful
* match. Zero bits in the @c tagsel can be used to indicate wildcarded bits
* in the 64-bit tag which can be useful for implementing MPI's
* @c MPI_ANY_SOURCE and @c MPI_ANY_TAG. Following the example bit splicing in
* the above @c stag example:
*
* @code{.c}
// Example MPI implementation where MPI_COMM_WORLD implemented as 0x3333
// MPI_Irecv source_rank=MPI_ANY_SOURCE, tag=7, comm=MPI_COMM_WORLD
rtag = 0x3333000000000007;
rtagsel = 0xffff0000ffffffff;
// MPI_Irecv source_rank=3, tag=MPI_ANY_TAG, comm=MPI_COMM_WORLD
rtag = 0x3333000300000000;
rtagsel = 0xffffffff80000000; // can't ignore sign bit in tag
// MPI_Irecv source_rank=MPI_ANY_SOURCE, tag=MPI_ANY_TAG, comm=MPI_COMM_WORLD
rtag = 0x3333000300000000;
rtagsel = 0xffff000080000000; // can't ignore sign bit in tag
@endcode
*
*
* Applications that do not follow tag matching semantics can simply always
* pass a value of @c 0 for @c rtagsel, which will always yield a successful
* match to the first preposted buffer. If a message cannot be matched to any
* of the preposted buffers, the message is delivered as an unexpected
* message.
*
* @section mq_receive MQ Message Reception
*
* MQ messages are either received as @e expected or @e unexpected: @li The
* received message is @e expected if the incoming message tag matches the
* combination of tag and tag selector of at least one of the user-provided
* receive buffers preposted with @ref psm2_mq_irecv.
*
* @li The received message is @e unexpected if the incoming message tag @b
* doesn't match any combination of tag and tag selector from all the
* user-provided receive buffers preposted with @ref psm2_mq_irecv.
*
* Unexpected messages are messages that the MQ library buffers until the
* user provides a receive buffer that can match the unexpected message.
* With Matched Queues and MPI alike, unexpected messages can occur as a
* side-effect of the programming model, whereby the arrival of messages can be
* slightly out of step with the ordering in which the user
* provides receive buffers. Unexpected messages can also be triggered by the
* difference between the rate at which a sender produces messages and the rate
* at which a paired receiver can post buffers and hence consume the messages.
*
* In all cases, too many @e unexpected messages will negatively affect
* performance. Users can employ some of the following mechanisms to reduce
* the effect of added memory allocations and copies that result from
* unexpected messages:
* @li If and when possible, receive buffers should be posted as early as
* possible and ideally before calling into the progress engine.
* @li Use of rendezvous messaging that can be controlled with
* @ref PSM2_MQ_RNDV_HFI_SZ and @ref PSM2_MQ_RNDV_SHM_SZ options. These
* options default to values determined to make effective use of
* bandwidth and are hence not advisable for all communication message
* sizes, but rendezvous messages inherently prevent unexpected
* messages by synchronizing the sender with the receiver beforehand.
* @li The amount of memory that is allocated to handle unexpected messages
* can be bounded by adjusting the Global @ref PSM2_MQ_MAX_SYSBUF_MBYTES
* option.
* @li MQ statistics, such as the amount of received unexpected messages and
* the aggregate amount of unexpected bytes are available in the @ref
* psm2_mq_stats structure.
*
* Whenever a match occurs, whether the message is expected or unexpected, it
* is generally up to the user to ensure that the message is not truncated.
* Message truncation occurs when the size of the preposted buffer is less than
* the size of the incoming matched message. MQ will correctly handle
* message truncation by always copying the appropriate amount of bytes as to
* not overwrite any data. While it is valid to send less data than the amount
* of data that has been preposted, messages that are truncated will be marked
* @ref PSM2_MQ_TRUNCATION as part of the error code in the message status
* structure (@ref psm2_mq_status_t or @ref psm2_mq_status2_t).
*
* @section mq_completion MQ Completion Semantics
*
* Message completion in Matched Queues follows local completion semantics.
* When sending an MQ message, it is deemed complete when MQ guarantees that
* the source data has been sent and that the entire input source data memory
* location can be safely overwritten. As with standard Message-Passing,
* MQ does not make any remote completion guarantees for sends. MQ does
* however, allow a sender to synchronize with a receiver to send a synchronous
* message which sends a message only after a matching receive buffer has been
* posted by the receiver (@ref PSM2_MQ_FLAG_SENDSYNC).
*
* A receive is deemed complete after it has matched its associated receive
* buffer with an incoming send and that the data from the send has been
* completely delivered to the receive buffer.
*
* @section mq_progress MQ Progress Requirements
*
* Progress on MQs must be @e explicitly ensured by the user for correctness.
* The progress requirement holds even if certain areas of the MQ
* implementation require less network attention than others, or if progress
* may internally be guaranteed through interrupts. The main polling function,
* @ref psm2_poll, is the most general form of ensuring process on a given
* endpoint. Calling @ref psm2_poll ensures that progress is made over all the
* MQs and other components instantiated over the endpoint passed to @ref
* psm2_poll.
*
* While @ref psm2_poll is the only way to directly ensure progress, other MQ
* functions will conditionally ensure progres depending on how they are used:
*
* @li @ref psm2_mq_wait employs polling and waits until the request is
* completed. For blocking communication operations where the caller is
* waiting on a single send or receive to complete, psm2_mq_wait usually
* provides the best responsiveness in terms of latency.
*
* @li @ref psm2_mq_test can test a particular request for completion, but @b
* never directly or indirectly ensures progress as it only tests the
* completion status of a request, nothing more. See functional documentation
* in @ref psm2_mq_test for a detailed discussion.
*
* @li @ref psm2_mq_ipeek ensures progress if and only if the MQ's completion
* queue is empty and will not ensure progress as long as the completion queue
* is non-empty. Users that always aggressively process all elements of the MQ
* completion queue as part of their own progress engine will indirectly always
* ensure MQ progress. The ipeek mechanism is the preferred way for
* ensuring progress when many non-blocking requests are in flight since ipeek
* returns requests in the order in which they complete. Depending on how the
* user initiates and completes communication, this may be preferable to
* calling other progress functions on individual requests.
*/
/*! @defgroup mq PSM Matched Queues
*
* @{
*/
/** @brief Initialize the MQ component for MQ communication
*
* This function provides the Matched Queue handle necessary to perform all
* Matched Queue communication operations.
*
* @param[in] ep Endpoint over which to initialize Matched Queue
* @param[in] ignored
* @param[in] opts Set of options for Matched Queue
* @param[in] numopts Number of options passed
* @param[out] mq User-supplied storage to return the Matched Queue handle
* associated to the newly created Matched Queue.
*
* @remark This function can be called many times to retrieve the MQ handle
* associated to an endpoint, but options are only considered the first
* time the function is called.
*
* @post The user obtains a handle to an instantiated Match Queue.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK A new Matched Queue has been instantiated across all the
* members of the group.
*
* @code{.c}
int try_open_endpoint_and_initialize_mq(
psm2_ep_t *ep, // endpoint handle
psm2_epid_t *epid, // unique endpoint ID
psm2_uuid_t job_uuid, // unique job uuid, for ep_open
psm2_mq_t *mq, // MQ handle initialized on endpoint 'ep'
uint64_t communicator_bits) // Where we store our communicator or
// context bits in the 64-bit tag.
{
// Simplified open, see psm2_ep_open documentation for more info
psm2_ep_open(job_uuid,
NULL, // no options
ep, epid);
// We initialize a matched queue by telling PSM the bits that are
// order-significant in the tag. Point-to-point ordering will not be
// maintained between senders where the communicator bits are not the
// same.
psm2_mq_init(ep,
communicator_bits,
NULL, // no other MQ options
0, // 0 options passed
mq); // newly initialized matched Queue
return 1;
}
@endcode
*/
psm2_error_t
psm2_mq_init(psm2_ep_t ep, uint64_t ignored,
const struct psm2_optkey *opts, int numopts, psm2_mq_t *mq);
#define PSM2_MQ_ORDERMASK_NONE 0ULL
/**< This macro is reserved for future tag order masking support. */
#define PSM2_MQ_ORDERMASK_ALL 0xffffffffffffffffULL
/**< This macro is reserved for future tag order masking support. */
/** @brief Finalize (close) an MQ handle
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK A given Matched Queue has been freed and use of the future
* use of the handle produces undefined results.
*/
psm2_error_t
psm2_mq_finalize(psm2_mq_t mq);
#define PSM2_MQ_TAG_ELEMENTS 4
/**< Represents the number of 32-bit tag elements in the psm2_mq_tag_t
* type plus one extra element to keep alignment and padding
* as 16 bytes. */
/** @struct psm2_mq_tag
** @brief MQ Message tag
*
* Extended message tag type introduced in PSM 2.0. The previous 64 bit tag
* values are replaced by a struct containing three 32 bit tag values for a
* total of 96 bits. Matching semantics are unchanged from the previous 64-bit
* matching scheme; the only difference is that 96 bits are matched instead of
* 64. For interoperability with existing PSM routines, 64 bit tags are
* extended to a 96 bit tag by setting the upper 32 bits (tag[2] or tag2) to
* zero. Other than this caveat, all of the existing routines using 64-bit
* tags are interchangeable with PSM2 routines using this psm2_mq_tag_t type.
* For example, a message sent using @ref psm2_mq_send can be received using
* @ref psm2_mq_irecv2, provided the tags match as described above.
*/
typedef
//struct psm2_mq_tag {
union psm2_mq_tag {
// union {
uint32_t tag[PSM2_MQ_TAG_ELEMENTS]; /* No longer specifying
* alignment as it makes
* code break with newer
* compilers. */
/**< 3 x 32bit array representation of @ref psm2_mq_tag */
struct {
uint32_t tag0; /**< 1 of 3 uint32_t tag values */
uint32_t tag1; /**< 2 of 3 uint32_t tag values */
uint32_t tag2; /**< 3 of 3 uint32_t tag values */
};
// };
} psm2_mq_tag_t;
/** @brief MQ Non-blocking operation status
*
* Message completion status for asynchronous communication operations.
* For wait and test functions, MQ fills in the structure upon completion.
* Upon completion, receive requests fill in every field of the status
* structure while send requests only return a valid error_code and context
* pointer.
*/
typedef
struct psm2_mq_status {
/** Sender's original message tag (receive reqs only) */
uint64_t msg_tag;
/** Sender's original message length (receive reqs only) */
uint32_t msg_length;
/** Actual number of bytes transfered (receive reqs only) */
uint32_t nbytes;
/** MQ error code for communication operation */
psm2_error_t error_code;
/**< User-associated context for send or receive */
void *context;
} psm2_mq_status_t;
/** @brief MQ Non-blocking operation status
*
* Message completion status for asynchronous communication operations. For
* wait and test functions, MQ fills in the structure upon completion. Upon
* completion, requests fill in every field of the status structure with the
* exception of the nbytes field, which is only valid for receives. Version 2
* of the status type contains an @ref psm2_mq_tag_t type to represent the tag
* instead of a 64-bit integer value and is for use with PSM v2 routines.
*/
typedef
struct psm2_mq_status2 {
/** Remote peer's epaddr */
psm2_epaddr_t msg_peer;
/** Sender's original message tag */
psm2_mq_tag_t msg_tag __attribute__ ((aligned(16)));/* Alignment added
* to preserve the
* layout as is
* expected by
* existent code */
/** Sender's original message length */
uint32_t msg_length;
/** Actual number of bytes transfered (receiver only) */
uint32_t nbytes;
/** MQ error code for communication operation */
psm2_error_t error_code;
/** User-associated context for send or receive */
void *context;
} psm2_mq_status2_t;
/** @brief PSM2 Communication handle (opaque) */
typedef struct psm2_mq_req *psm2_mq_req_t;
/** @brief MQ Request Struct
*
* Message completion request for asynchronous communication operations.
* Upon completion, requests are filled with the valid data for the
* corresponding send/recv operation that was completed. This datatype
* contains the status data and is converted into the
* mq_status structures in wait/test functions.
*/
struct psm2_mq_req_user {
/* Tag matching vars */
psm2_epaddr_t peer;
psm2_mq_tag_t tag __attribute__ ((aligned(16)));/* Alignment added
* to preserve the
* layout as is
* expected by
* existent code */
psm2_mq_tag_t tagsel; /* used for receives */
/* Buffer attached to request. May be a system buffer for unexpected
* messages or a user buffer when an expected message */
uint8_t *buf;
uint32_t buf_len;
uint32_t error_code;
uint32_t recv_msglen; /* Message length we are ready to receive */
uint32_t send_msglen; /* Message length from sender */
/* Used for request to send messages */
void *context; /* user context associated to sends or receives */
uint64_t user_reserved[4];
};
/*! @} */
/*! @ingroup mq
* @defgroup mq_options PSM Matched Queue Options
* @{
*
* MQ options can be modified at any point at runtime, unless otherwise noted.
* The following example shows how to retrieve the current message size at
* which messages are sent as synchronous.
*
* @code{.c}
uint32_t get_hfirv_size(psm2_mq_t mq)
{
uint32_t rvsize;
psm2_getopt(mq, PSM2_MQ_RNDV_HFI_SZ, &rvsize);
return rvsize;
}
@endcode
*/
/** @brief Get an MQ option (Deprecated. Use psm2_getopt with PSM2_COMPONENT_MQ)
*
* Function to retrieve the value of an MQ option.
*
* @param[in] mq Matched Queue handle
* @param[in] option Index of option to retrieve. Possible values are:
* @li @ref PSM2_MQ_RNDV_HFI_SZ
* @li @ref PSM2_MQ_RNDV_SHM_SZ
* @li @ref PSM2_MQ_MAX_SYSBUF_MBYTES
*
* @param[in] value Pointer to storage that can be used to store the value of
* the option to be set. It is up to the user to ensure that the
* pointer points to a memory location large enough to accommodate
* the value associated to the type. Each option documents the size
* associated to its value.
*
* @returns PSM2_OK if option could be retrieved.
* @returns PSM2_PARAM_ERR if the option is not a valid option number
*/
psm2_error_t psm2_mq_getopt(psm2_mq_t mq, int option, void *value);
/** @brief Set an MQ option (Deprecated. Use psm2_setopt with PSM2_COMPONENT_MQ)
*
* Function to set the value of an MQ option.
*
* @param[in] mq Matched Queue handle
* @param[in] option Index of option to retrieve. Possible values are:
* @li @ref PSM2_MQ_RNDV_HFI_SZ
* @li @ref PSM2_MQ_RNDV_SHM_SZ
* @li @ref PSM2_MQ_MAX_SYSBUF_MBYTES
*
* @param[in] value Pointer to storage that contains the value to be updated
* for the supplied option number. It is up to the user to
* ensure that the pointer points to a memory location with a
* correct size.
*
* @returns PSM2_OK if option could be retrieved.
* @returns PSM2_PARAM_ERR if the option is not a valid option number
* @returns PSM2_OPT_READONLY if the option to be set is a read-only option
* (currently no MQ options are read-only).
*/
psm2_error_t psm2_mq_setopt(psm2_mq_t mq, int option, const void *value);
/*! @} */
/*! @ingroup mq
* @{
*/
#define PSM2_MQ_FLAG_SENDSYNC 0x01
/**< MQ Send Force synchronous send */
#define PSM2_MQ_REQINVALID ((psm2_mq_req_t)(NULL))
/**< MQ request completion value */
#define PSM2_MQ_ANY_ADDR ((psm2_epaddr_t)NULL)
/**< MQ receive from any source epaddr */
/** @brief MQ fast-path operation enumeration
*
* To provide for quick enqueing of send/receives from within an AM handler
* PSM2 provdes fast path send/recv options that will enqueue those ops
* into the MQ. The supported operations to call in fast path are enumerated
* in the @ref psm2_mq_fp_op enum.
*/
enum psm2_mq_fp_op {
PSM2_MQ_ISEND_FP = 1,
PSM2_MQ_IRECV_FP,
};
/** @brief Post a fast-path isend/irecv into the MQ
*
* Function to only enqueue fast-path non-blocking sends or non-blocking recvs
* into a particular MQ. These calls only work if the process already holds
* the mq progress lock, this case traditionally only applies to calls from
* a registered AM Handler.
*
* This function helps to enable one-sided communication models from middleware
* such as OFI to provide fast >2KB message transfers for RMA operations.
*
* When posting irecvs every MQ message received on a particular MQ,
* the @c tag and @c tagsel parameters are used against the incoming
* message's send tag as described in @ref tagmatch.
*
* When posting isends the user gurantees that the source data will remain
* unmodified until the send is locally completed through a call such as
* @ref psm2_mq_wait or @ref psm2_mq_test.
*
* Progress on the operations enqueued into the MQ will may not occur until
* the next PSM2 progress API is invoked.
*
* @param[in] ep PSM2 endpoint
* @param[in] mq Matched Queue Handle
* @param[in] addr Destination EP address (used only on isends)
* @param[in] tag Send/Receive tag
* @param[in] tagsel Receive tag selector (used only on irecvs)
* @param[in] flags Send/Receive Flags
* @param[in] buf Send/Receive buffer
* @param[in] len Send/Receive buffer length
* @param[in] context User context pointer, available in @ref psm2_mq_status_t
* upon completion
* @param[in] fp_type Fast-path op requested
* @param[out] req PSM MQ Request handle created by the preposted receive, to
* be used for explicitly controlling message receive
* completion.
*
* @post The supplied buffer is given to MQ to match against incoming
* messages unless it is cancelled via @ref psm2_mq_cancel @e before any
* match occurs.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The receive buffer has successfully been posted to the MQ.
*/
psm2_error_t
psm2_mq_fp_msg(psm2_ep_t ep, psm2_mq_t mq, psm2_epaddr_t addr, psm2_mq_tag_t *tag,
psm2_mq_tag_t *tagsel, uint32_t flags, void *buf, uint32_t len,
void *context, enum psm2_mq_fp_op fp_type, psm2_mq_req_t *req);
/** @brief Post a receive to a Matched Queue with tag selection criteria
*
* Function to receive a non-blocking MQ message by providing a preposted
* buffer. For every MQ message received on a particular MQ, the @c tag and @c
* tagsel parameters are used against the incoming message's send tag as
* described in @ref tagmatch.
*
* @param[in] mq Matched Queue Handle
* @param[in] rtag Receive tag
* @param[in] rtagsel Receive tag selector
* @param[in] flags Receive flags (None currently supported)
* @param[in] buf Receive buffer
* @param[in] len Receive buffer length
* @param[in] context User context pointer, available in @ref psm2_mq_status_t
* upon completion
* @param[out] req PSM MQ Request handle created by the preposted receive, to
* be used for explicitly controlling message receive
* completion.
*
* @post The supplied receive buffer is given to MQ to match against incoming
* messages unless it is cancelled via @ref psm2_mq_cancel @e before any
* match occurs.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The receive buffer has successfully been posted to the MQ.
*/
psm2_error_t
psm2_mq_irecv(psm2_mq_t mq, uint64_t rtag, uint64_t rtagsel, uint32_t flags,
void *buf, uint32_t len, void *context, psm2_mq_req_t *req);
/** @brief Post a receive to a Matched Queue with source and tag selection
* criteria
*
* Function to receive a non-blocking MQ message by providing a preposted
* buffer. For every MQ message received on a particular MQ, the @c src, @c tag
* and @c tagsel parameters are used against the incoming message's send tag as
* described in @ref tagmatch.
*
* @param[in] mq Matched Queue Handle
* @param[in] src Source (sender's) epaddr (may be PSM2_MQ_ANY_ADDR)
* @param[in] rtag Receive tag
* @param[in] rtagsel Receive tag selector
* @param[in] flags Receive flags (None currently supported)
* @param[in] buf Receive buffer
* @param[in] len Receive buffer length
* @param[in] context User context pointer, available in @ref psm2_mq_status2_t
* upon completion
* @param[out] req PSM MQ Request handle created by the preposted receive, to
* be used for explicitly controlling message receive
* completion.
*
* @post The supplied receive buffer is given to MQ to match against incoming
* messages unless it is cancelled via @ref psm2_mq_cancel @e before any
* match occurs.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The receive buffer has successfully been posted to the MQ.
*/
psm2_error_t
psm2_mq_irecv2(psm2_mq_t mq, psm2_epaddr_t src, psm2_mq_tag_t *rtag,
psm2_mq_tag_t *rtagsel, uint32_t flags, void *buf, uint32_t len,
void *context, psm2_mq_req_t *req);
/** @brief Post a receive to a Matched Queue with matched request
*
* Function to receive a non-blocking MQ message by providing a preposted
* buffer. The provided request should already be matched using the @ref
* psm2_mq_improbe or @ref psm2_mq_improbe2 routines. It is an error to pass a
* request that has not already been matched by one of those routines.
*
* @param[in] mq Matched Queue Handle
* @param[in] flags Receive flags (None currently supported)
* @param[in] buf Receive buffer
* @param[in] len Receive buffer length
* @param[in] context User context pointer, available in @ref psm2_mq_status_t
* upon completion
* @param[inout] reqo PSM MQ Request handle matched previously by a matched
* probe routine (@ref psm2_mq_improbe or @ref
* psm2_mq_improbe2), also to be used for explicitly
* controlling message receive completion.
*
* @post The supplied receive buffer is given to MQ to deliver the matched
* message.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The receive buffer has successfully been posted to the MQ.
*/
psm2_error_t
psm2_mq_imrecv(psm2_mq_t mq, uint32_t flags, void *buf, uint32_t len,
void *context, psm2_mq_req_t *reqo);
/** @brief Send a blocking MQ message
*
* Function to send a blocking MQ message, whereby the message is locally
* complete and the source data can be modified upon return.
*
* @param[in] mq Matched Queue Handle
* @param[in] dest Destination EP address
* @param[in] flags Message flags, currently:
* @li PSM2_MQ_FLAG_SENDSYNC tells PSM to send the message
* synchronously, meaning that the message will not be sent until
* the receiver acknowledges that it has matched the send with a
* receive buffer.
* @param[in] stag Message Send Tag
* @param[in] buf Source buffer pointer
* @param[in] len Length of message starting at @c buf.
*
* @post The source buffer is reusable and the send is locally complete.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* @note This send function has been implemented to best suit MPI_Send.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The message has been successfully sent.
*/
psm2_error_t
psm2_mq_send(psm2_mq_t mq, psm2_epaddr_t dest, uint32_t flags, uint64_t stag,
const void *buf, uint32_t len);
/** @brief Send a blocking MQ message
*
* Function to send a blocking MQ message, whereby the message is locally
* complete and the source data can be modified upon return.
*
* @param[in] mq Matched Queue Handle
* @param[in] dest Destination EP address
* @param[in] flags Message flags, currently:
* @li PSM2_MQ_FLAG_SENDSYNC tells PSM to send the message
* synchronously, meaning that the message will not be sent until
* the receiver acknowledges that it has matched the send with a
* receive buffer.
* @param[in] stag Message Send Tag
* @param[in] buf Source buffer pointer
* @param[in] len Length of message starting at @c buf.
*
* @post The source buffer is reusable and the send is locally complete.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* @note This send function has been implemented to best suit MPI_Send.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The message has been successfully sent.
*/
psm2_error_t
psm2_mq_send2(psm2_mq_t mq, psm2_epaddr_t dest, uint32_t flags,
psm2_mq_tag_t *stag, const void *buf, uint32_t len);
/** @brief Send a non-blocking MQ message
*
* Function to initiate the send of a non-blocking MQ message, whereby the
* user guarantees that the source data will remain unmodified until the send
* is locally completed through a call such as @ref psm2_mq_wait or @ref
* psm2_mq_test.
*
* @param[in] mq Matched Queue Handle
* @param[in] dest Destination EP address
* @param[in] flags Message flags, currently:
* @li PSM2_MQ_FLAG_SENDSYNC tells PSM to send the message
* synchronously, meaning that the message will not be sent until
* the receiver acknowledges that it has matched the send with a
* receive buffer.
* @param[in] stag Message Send Tag
* @param[in] buf Source buffer pointer
* @param[in] len Length of message starting at @c buf.
* @param[in] context Optional user-provided pointer available in @ref
* psm2_mq_status_t when the send is locally completed.
* @param[out] req PSM MQ Request handle created by the non-blocking send, to
* be used for explicitly controlling message completion.
*
* @post The source buffer is not reusable and the send is not locally complete
* until its request is completed by either @ref psm2_mq_test or @ref
* psm2_mq_wait.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* @note This send function has been implemented to suit MPI_Isend.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The message has been successfully initiated.
*
* @code{.c}
psm2_mq_req_t
non_blocking_send(const psm2_mq_t mq, psm2_epaddr_t dest_ep,
const void *buf, uint32_t len,
int context_id, int send_tag, const my_request_t *req)
{
psm2_mq_req_t req_mq;
// Set up our send tag, assume that "my_rank" is global and represents
// the rank of this process in the job
uint64_t tag = ( ((context_id & 0xffff) << 48) |
((my_rank & 0xffff) << 32) |
((send_tag & 0xffffffff)) );
psm2_mq_isend(mq, dest_ep,
0, // no flags
tag,
buf,
len,
req, // this req is available in psm2_mq_status_t when one
// of the synchronization functions is called.
&req_mq);
return req_mq;
}
@endcode
*/
psm2_error_t
psm2_mq_isend(psm2_mq_t mq, psm2_epaddr_t dest, uint32_t flags, uint64_t stag,
const void *buf, uint32_t len, void *context, psm2_mq_req_t *req);
/** @brief Send a non-blocking MQ message
*
* Function to initiate the send of a non-blocking MQ message, whereby the
* user guarantees that the source data will remain unmodified until the send
* is locally completed through a call such as @ref psm2_mq_wait or @ref
* psm2_mq_test.
*
* @param[in] mq Matched Queue Handle
* @param[in] dest Destination EP address
* @param[in] flags Message flags, currently:
* @li PSM2_MQ_FLAG_SENDSYNC tells PSM to send the message
* synchronously, meaning that the message will not be sent until
* the receiver acknowledges that it has matched the send with a
* receive buffer.
* @param[in] stag Message Send Tag, array of three 32-bit values.
* @param[in] buf Source buffer pointer
* @param[in] len Length of message starting at @c buf.
* @param[in] context Optional user-provided pointer available in @ref
* psm2_mq_status2_t when the send is locally completed.
* @param[out] req PSM MQ Request handle created by the non-blocking send, to
* be used for explicitly controlling message completion.
*
* @post The source buffer is not reusable and the send is not locally complete
* until its request is completed by either @ref psm2_mq_test or @ref
* psm2_mq_wait.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* @note This send function has been implemented to suit MPI_Isend.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The message has been successfully initiated.
*
* @code{.c}
psm2_mq_req_t
non_blocking_send(const psm2_mq_t mq, psm2_epaddr_t dest_ep,
const void *buf, uint32_t len,
int context_id, int send_tag, const my_request_t *req)
{
psm2_mq_req_t req_mq;
// Set up our send tag, assume that "my_rank" is global and represents
// the rank of this process in the job
psm2_mq_tag_t tag;
tag.tag[0] = send_tag;
tag.tag[1] = my_rank;
tag.tag[2] = context_id;
psm2_mq_isend(mq, dest_ep,
0, // no flags
&tag,
buf,
len,
req, // this req is available in psm2_mq_status2_t when one
// of the synchronization functions is called.
&req_mq);
return req_mq;
}
@endcode
*/
psm2_error_t
psm2_mq_isend2(psm2_mq_t mq, psm2_epaddr_t dest, uint32_t flags,
psm2_mq_tag_t *stag, const void *buf, uint32_t len, void *context,
psm2_mq_req_t *req);
/** @brief Try to Probe if a message is received matching tag selection
* criteria
*
* Function to verify if a message matching the supplied tag and tag selectors
* has been received. The message is not fully matched until the user
* provides a buffer with the successfully matching tag selection criteria
* through @ref psm2_mq_irecv.
* Probing for messages may be useful if the size of the
* message to be received is unknown, in which case its size will be
* available in the @c msg_length member of the returned @c status.
*
* Function ensures progress if matching request wasn’t found
* after the first attempt.
*
* @param[in] mq Matched Queue Handle
* @param[in] rtag Message receive tag
* @param[in] rtagsel Message receive tag selector
* @param[out] status Upon return, @c status is filled with information
* regarding the matching send.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The iprobe is successful and status is updated if non-NULL.
* @retval PSM2_MQ_NO_COMPLETIONS The iprobe is unsuccessful and status is
* unchanged.
*/
psm2_error_t
psm2_mq_iprobe(psm2_mq_t mq, uint64_t rtag, uint64_t rtagsel,
psm2_mq_status_t *status);
/** @brief Try to Probe if a message is received matching source and tag
* selection criteria
*
* Function to verify if a message matching the supplied source, tag, and tag
* selectors has been received. The message is not fully matched until the
* user provides a buffer with the successfully matching tag selection criteria
* through @ref psm2_mq_irecv. Probing for messages may be useful if the size
* of the message to be received is unknown, in which case its size will be
* available in the @c msg_length member of the returned @c status.
*
* Function ensures progress if matching request wasn’t found
* after the first attempt.
*
* @param[in] mq Matched Queue Handle
* @param[in] src Source (sender's) epaddr (may be PSM2_MQ_ANY_ADDR)
* @param[in] rtag Message receive tag
* @param[in] rtagsel Message receive tag selector
* @param[out] status Upon return, @c status is filled with information
* regarding the matching send.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The iprobe is successful and status is updated if non-NULL.
* @retval PSM2_MQ_NO_COMPLETIONS The iprobe is unsuccessful and status is
* unchanged.
*/
psm2_error_t
psm2_mq_iprobe2(psm2_mq_t mq, psm2_epaddr_t src, psm2_mq_tag_t *rtag,
psm2_mq_tag_t *rtagsel, psm2_mq_status2_t *status);
/** @brief Try to Probe if a message is received matching tag selection
* criteria
*
* Function to verify if a message matching the supplied source, tag, and tag
* selectors has been received. If a match is successful, the message is
* removed from the matching queue and returned as a request object. The
* message can be received using @ref psm2_mq_imrecv. It is erroneous to use
* the request object returned by @ref psm2_mq_improbe for any purpose other
* than passing to @ref psm2_mq_imrecv. Probing for messages may be useful if
* the size of the message to be received is unknown, in which case its size
* will be available in the @c msg_length member of the returned @c status.
*
* Function ensures progress if matching request wasn’t found
* after the first attempt.
*
* @param[in] mq Matched Queue Handle
* @param[in] rtag Message receive tag
* @param[in] rtagsel Message receive tag selector
* @param[out] req PSM MQ Request handle, to be used for receiving the matched
* message.
* @param[out] status Upon return, @c status is filled with information
* regarding the matching send.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The iprobe is successful and status is updated if non-NULL.
* @retval PSM2_MQ_NO_COMPLETIONS The iprobe is unsuccessful and status is unchanged.
*/
psm2_error_t
psm2_mq_improbe(psm2_mq_t mq, uint64_t rtag, uint64_t rtagsel, psm2_mq_req_t *req,
psm2_mq_status_t *status);
/** @brief Try to Probe if a message is received matching source and tag
* selection criteria
*
* Function to verify if a message matching the supplied tag and tag selectors
* has been received. If a match is successful, the message is removed from
* the matching queue and returned as a request object. The message can be
* received using @ref psm2_mq_imrecv. It is erroneous to use the request
* object returned by @ref psm2_mq_improbe for any purpose other than passing to
* @ref psm2_mq_imrecv. Probing for messages may be useful if the size of the
* message to be received is unknown, in which case its size will be available
* in the @c msg_length member of the returned @c status.
*
* Function ensures progress if matching request wasn’t found
* after the first attempt.
*
* @param[in] mq Matched Queue Handle
* @param[in] src Source (sender's) epaddr (may be PSM2_MQ_ANY_ADDR)
* @param[in] rtag Message receive tag
* @param[in] rtagsel Message receive tag selector
* @param[out] reqo PSM MQ Request handle, to be used for receiving the matched
* message.
* @param[out] status Upon return, @c status is filled with information
* regarding the matching send.
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The iprobe is successful and status is updated if non-NULL.
* @retval PSM2_MQ_NO_COMPLETIONS The iprobe is unsuccessful and status is unchanged.
*/
psm2_error_t
psm2_mq_improbe2(psm2_mq_t mq, psm2_epaddr_t src, psm2_mq_tag_t *rtag,
psm2_mq_tag_t *rtagsel, psm2_mq_req_t *reqo,
psm2_mq_status2_t *status);
/** @brief Query for non-blocking requests ready for completion.
*
* Function to query a particular MQ for non-blocking requests that are ready
* for completion. Requests "ready for completion" are not actually considered
* complete by MQ until they are returned to the MQ library through @ref
* psm2_mq_wait or @ref psm2_mq_test.
*
* If the user can deal with consuming request completions in the order in
* which they complete, this function can be used both for completions and for
* ensuring progress. The latter requirement is satisfied when the user
* peeks an empty completion queue as a side effect of always aggressively
* peeking and completing all an MQ's requests ready for completion.
*
*
* @param[in] mq Matched Queue Handle
* @param[in,out] req MQ non-blocking request
* @param[in] status Optional MQ status, can be NULL.
*
* @post The user has ensured progress if the function returns @ref
* PSM2_MQ_NO_COMPLETIONS
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The peek is successful and @c req is updated with a request
* ready for completion. If @c status is non-NULL, it is also
* updated.
*
* @retval PSM2_MQ_NO_COMPLETIONS The peek is not successful, meaning that there
* are no further requests ready for completion.
* The contents of @c req and @c status remain
* unchanged.
* @code{.c}
// Example that uses ipeek_mq_ipeek to make progress instead of psm2_poll
// We return the amount of non-blocking requests that we've completed
int main_progress_loop(psm2_mq_t mq)
{
int num_completed = 0;
psm2_mq_req_t req;
psm2_mq_status_t status;
psm2_error_t err;
my_request_t *myreq;
do {
err = psm2_mq_ipeek(mq, &req,
NULL); // No need for status in ipeek here
if (err == PSM2_MQ_NO_COMPLETIONS)
return num_completed;
else if (err != PSM2_OK)
goto errh;
num_completed++;
// We obtained 'req' at the head of the completion queue. We can
// now free the request with PSM and obtain our original reques
// from the status' context
err = psm2_mq_test(&req, // will be marked as invalid
&status); // we need the status
myreq = (my_request_t *) status.context;
// handle the completion for myreq whether myreq is a posted receive
// or a non-blocking send.
}
while (1);
}
@endcode
*/
psm2_error_t
psm2_mq_ipeek(psm2_mq_t mq, psm2_mq_req_t *req, psm2_mq_status_t *status);
/** @brief Query for non-blocking requests ready for completion.
*
* Function to query a particular MQ for non-blocking requests that are ready
* for completion. Requests "ready for completion" are not actually considered
* complete by MQ until they are returned to the MQ library through @ref
* psm2_mq_wait or @ref psm2_mq_test.
*
* If the user can deal with consuming request completions in the order in
* which they complete, this function can be used both for completions and for
* ensuring progress. The latter requirement is satisfied when the user
* peeks an empty completion queue as a side effect of always aggressively
* peeking and completing all an MQ's requests ready for completion.
*
*
* @param[in] mq Matched Queue Handle
* @param[in,out] req MQ non-blocking request
* @param[in] status Optional MQ status, can be NULL.
*
* @post The user has ensured progress if the function returns @ref
* PSM2_MQ_NO_COMPLETIONS
*
* @remark This function may be called simultaneously from multiple threads
* as long as different MQ arguments are used in each of the calls.
*
* The following error codes are returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The peek is successful and @c req is updated with a request
* ready for completion. If @c status is non-NULL, it is also
* updated.
*
* @retval PSM2_MQ_NO_COMPLETIONS The peek is not successful, meaning that there
* are no further requests ready for completion.
* The contents of @c req and @c status remain
* unchanged.
* @code{.c}
// Example that uses ipeek_mq_ipeek to make progress instead of psm2_poll
// We return the amount of non-blocking requests that we've completed
int main_progress_loop(psm2_mq_t mq)
{
int num_completed = 0;
psm2_mq_req_t req;
psm2_mq_status2_t status;
psm2_error_t err;
my_request_t *myreq;
do {
err = psm2_mq_ipeek2(mq, &req,
NULL); // No need for status in ipeek here
if (err == PSM2_MQ_NO_COMPLETIONS)
return num_completed;
else if (err != PSM2_OK)
goto errh;
num_completed++;
// We obtained 'req' at the head of the completion queue. We can
// now free the request with PSM and obtain our original reques
// from the status' context
err = psm2_mq_test2(&req, // will be marked as invalid
&status); // we need the status
myreq = (my_request_t *) status.context;
// handle the completion for myreq whether myreq is a posted receive
// or a non-blocking send.
}
while (1);
}
@endcode
*/
psm2_error_t
psm2_mq_ipeek2(psm2_mq_t mq, psm2_mq_req_t *req, psm2_mq_status2_t *status);
/** @brief User defined Callback function handling copy of MQ request into user datatype
*
* Callback function used to convert an MQ request into a user's desired
* status structure. The user's callback function converts the MQ request into
* the provided status_array at the specified index.
*
* @param[in] req MQ External non-blocking Request structure
* @param[in] status_array Array of User defined status datatypes
* @param[in] entry_index Index in array where the converted request will be
* stored if successful
*
* The following error codes are returned.
*
* @retval < 0 The MQ conversion failed with a user defined error.
*
* @retval 0 The MQ was successfully processed, but was not saved
* in the provided @c status_array.
*
* @retval 1 The MQ was successfully processed and was saved in the
* @c status_array at the specified index.
*
* @retval >1 The MQ was successfully processed and was saved in the
* @c status_array at the specified index. This should
* be the last MQ converted in the batch, even if there
* are still spaces in @c status_array.
*/
typedef int (*psmi_mq_status_copy_user_t) (struct psm2_mq_req_user *req,
void *status_array, int entry_index);
/** @brief Check and dequeue MQ requests into a user's status array using a callback.
*
* Function to atomically check and dequeue MQ entries from the completed
* queue and copy the MQ requests into a user's status datatype through a
* status_copy callback function.
*
* Once the MQ request has been successfully converted by the callback, the
* MQ request is freed and the next entry is processed making the supplied
* Request pointer invalid.
*
* The variable "count" passed in will only be increased if the MQ request was
* successfully stored into the user's passed in array. Otherwise the count
* variable is unchanged.
*
* NOTE: a count of 0 passed into psm2_mq_ipeek_dequeue_multi will result in
* no MQ elements being processed.
*
* @param[in] mq Matched Queue Handle
* @param[in] status_array Array of User defined status datatypes
* @param[in] status_copy Callback function pointer to convert
* MQ to caller datatype
* @param[in/out] count [in]Size of status_array, [out]number of elements
* populated into status_array or user's error return code
*
* The following error codes are returned.
*
* @retval PSM2_OK The dequeue operation was successful and populated the
* full @c status_array up to @c count entries. The parameter
* @c count is equal to the count passed in by the user.
*
* @retval PSM2_MQ_NO_COMPLETIONS The dequeue operation was not able to read
* @c count entries into the @c status_array. The number
* of entries that were successfully written to the
* @c status_array is set in the @c count for the user.
*
* @retval PSM2_INTERNAL_ERR The @c status_copy failed to successfully
* copy the status entry into the user's datatype.
* @c count is set to the return code from the
* @c status_copy.
*/
psm2_error_t
psm2_mq_ipeek_dequeue_multi(psm2_mq_t mq, void *status_array,
psmi_mq_status_copy_user_t status_copy, int *count);
/** @brief Check and dequeue the first request entry from the completed queue.
*
* Function to atomically check and dequeue the first entry from the completed
* queue. It must be paired with function psm2_mq_req_free, which returns the
* request to PSM2 library.
*
* @param[in] mq Matched Queue Handle
* @param[out] req PSM MQ Request handle, to be used for receiving the matched
* message.
*
* The following error codes are returned.
*
* @retval PSM2_OK The dequeue operation was successful and @c req is updated
* with a request ready for completion.
*
* @retval PSM2_MQ_NO_COMPLETIONS The dequeue operation was not successful,
* meaning that there are no further requests ready
* for completion. The contents of @c req remain
* unchanged.
*/
psm2_error_t
psm2_mq_ipeek_dequeue(psm2_mq_t mq, psm2_mq_req_t *req);
/** @brief Return the request to PSM2 library.
*
* Function returns the request previously obtained via psm2_mq_ipeek_dequeue
* to the PSM2 library.
*
* @param[in] mq Matched Queue Handle
* @param[in] req PSM MQ Request handle to be returned to PSM2 library.
If @p req is NULL, no operation is performed.
*
* The following error codes are returned.
*
* @retval PSM2_OK Return of an object to PSM2 library pool was successful.
*/
psm2_error_t
psm2_mq_req_free(psm2_mq_t mq, psm2_mq_req_t req);
/** @brief Wait until a non-blocking request completes
*
* Function to wait on requests created from either preposted receive buffers
* or non-blocking sends. This is the only blocking function in the MQ
* interface and will poll until the request is complete as per the progress
* semantics explained in @ref mq_progress.
*
* @param[in,out] request MQ non-blocking request
* @param[out] status Updated if non-NULL when request successfully completes
*
* @pre The user has obtained a valid MQ request by calling @ref psm2_mq_isend
* or @ref psm2_mq_irecv and passes a pointer to enough storage to write
* the output of a @ref psm2_mq_status_t or NULL if status is to be
* ignored.
*
* @pre Since MQ will internally ensure progress while the user is
* suspended, the user need not ensure that progress is made prior to
* calling this function.
*
* @post The request is assigned the value @ref PSM2_MQ_REQINVALID and all
* associated MQ request storage is released back to the MQ library.
*
* @remark This function may be called simultaneously from multiple threads
* as long as the requests that are used in each of the calls are
* associated with different MQs.
*
* @remarks
* @li This function ensures progress on the endpoint as long as the request
* is incomplete.
* @li @c status can be NULL, in which case no status is written upon
* completion.
* @li If @c request is @ref PSM2_MQ_REQINVALID, the function returns
* immediately.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The request is complete or the value of @c was
* @ref PSM2_MQ_REQINVALID.
*
*/
psm2_error_t
psm2_mq_wait(psm2_mq_req_t *request, psm2_mq_status_t *status);
/** @brief Wait until a non-blocking request completes
*
* Function to wait on requests created from either preposted receive buffers
* or non-blocking sends. This is the only blocking function in the MQ
* interface and will poll until the request is complete as per the progress
* semantics explained in @ref mq_progress.
*
* @param[in,out] request MQ non-blocking request
* @param[out] status Updated if non-NULL when request successfully completes
*
* @pre The user has obtained a valid MQ request by calling @ref psm2_mq_isend
* or @ref psm2_mq_irecv and passes a pointer to enough storage to write
* the output of a @ref psm2_mq_status2_t or NULL if status is to be
* ignored.
*
* @pre Since MQ will internally ensure progress while the user is
* suspended, the user need not ensure that progress is made prior to
* calling this function.
*
* @post The request is assigned the value @ref PSM2_MQ_REQINVALID and all
* associated MQ request storage is released back to the MQ library.
*
* @remark This function may be called simultaneously from multiple threads
* as long as the requests that are used in each of the calls are
* associated with different MQs.
*
* @remarks
* @li This function ensures progress on the endpoint as long as the request
* is incomplete.
* @li @c status can be NULL, in which case no status is written upon
* completion.
* @li If @c request is @ref PSM2_MQ_REQINVALID, the function returns
* immediately.
*
* The following error code is returned. Other errors are handled by the PSM
* error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The request is complete or the value of @c was
* @ref PSM2_MQ_REQINVALID.
*
*/
psm2_error_t
psm2_mq_wait2(psm2_mq_req_t *request, psm2_mq_status2_t *status);
/** @brief Test if a non-blocking request is complete
*
* Function to test requests created from either preposted receive buffers or
* non-blocking sends for completion. Unlike @ref psm2_mq_wait, this function
* tests @c request for completion and @e never ensures progress directly or
* indirectly. It is up to the user to employ some of the progress functions
* described in @ref mq_progress to ensure progress if the user chooses to
* exclusively test requests for completion.
*
* Testing a request for completion @e never internally ensure progress in
* order to be useful to construct higher-level completion tests over arrays to
* test some, all or any request that has completed. For testing arrays of
* requests, it is preferable for performance reasons to only ensure progress
* once before testing a set of requests for completion.
*
* @param[in,out] request MQ non-blocking request
* @param[out] status Updated if non-NULL and the request successfully
* completes
*
* @pre The user has obtained a valid MQ request by calling @ref psm2_mq_isend
* or @ref psm2_mq_irecv and passes a pointer to enough storage to write
* the output of a @ref psm2_mq_status_t or NULL if status is to be
* ignored.
*
* @pre The user has ensured progress on the Matched Queue if @ref
* psm2_mq_test is exclusively used for guaranteeing request completions.
*
* @post If the request is complete, the request is assigned the value @ref
* PSM2_MQ_REQINVALID and all associated MQ request storage is released
* back to the MQ library. If the request is incomplete, the contents of
* @c request is unchanged.
*
* @post The user will ensure progress on the Matched Queue if @ref
* psm2_mq_test is exclusively used for guaranteeing request completions.
*
* @remark This function may be called simultaneously from multiple threads
* as long as the requests that are used in each of the calls are
* associated with different MQs.
*
* The following two errors are always returned. Other errors are handled by
* the PSM error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The request is complete and @c request is set to @ref
* PSM2_MQ_REQINVALID or the value of @c was PSM2_MQ_REQINVALID
*
* @retval PSM2_MQ_NO_COMPLETIONS The request is not complete and @c request is
* unchanged.
*
* @code{.c}
// Function that returns the first completed request in an array
// of requests.
void *
user_testany(psm2_ep_t ep, psm2_mq_req_t *allreqs, int nreqs)
{
int i;
void *context = NULL;
// Ensure progress only once
psm2_poll(ep);
// Test for at least one completion and return it's context
psm2_mq_status_t stat;
for (i = 0; i < nreqs; i++) {
if (psm2_mq_test(&allreqs[i], &stat) == PSM2_OK) {
context = stat.context;
break;
}
}
return context;
}
@endcode
*/
psm2_error_t
psm2_mq_test(psm2_mq_req_t *request, psm2_mq_status_t *status);
/** @brief Test if a non-blocking request is complete
*
* Function to test requests created from either preposted receive buffers or
* non-blocking sends for completion. Unlike @ref psm2_mq_wait, this function
* tests @c request for completion and @e never ensures progress directly or
* indirectly. It is up to the user to employ some of the progress functions
* described in @ref mq_progress to ensure progress if the user chooses to
* exclusively test requests for completion.
*
* Testing a request for completion @e never internally ensure progress in
* order to be useful to construct higher-level completion tests over arrays to
* test some, all or any request that has completed. For testing arrays of
* requests, it is preferable for performance reasons to only ensure progress
* once before testing a set of requests for completion.
*
* @param[in,out] request MQ non-blocking request
* @param[out] status Updated if non-NULL and the request successfully
* completes
*
* @pre The user has obtained a valid MQ request by calling @ref psm2_mq_isend
* or @ref psm2_mq_irecv and passes a pointer to enough storage to write
* the output of a @ref psm2_mq_status2_t or NULL if status is to be
* ignored.
*
* @pre The user has ensured progress on the Matched Queue if @ref
* psm2_mq_test is exclusively used for guaranteeing request completions.
*
* @post If the request is complete, the request is assigned the value @ref
* PSM2_MQ_REQINVALID and all associated MQ request storage is released
* back to the MQ library. If the request is incomplete, the contents of
* @c request is unchanged.
*
* @post The user will ensure progress on the Matched Queue if @ref
* psm2_mq_test is exclusively used for guaranteeing request completions.
*
* @remark This function may be called simultaneously from multiple threads
* as long as the requests that are used in each of the calls are
* associated with different MQs.
*
* The following two errors are always returned. Other errors are handled by
* the PSM error handler (@ref psm2_error_register_handler).
*
* @retval PSM2_OK The request is complete and @c request is set to @ref
* PSM2_MQ_REQINVALID or the value of @c was PSM2_MQ_REQINVALID
*
* @retval PSM2_MQ_NO_COMPLETIONS The request is not complete and @c request is
* unchanged.
*
* @code{.c}
// Function that returns the first completed request in an array
// of requests.
void *
user_testany(psm2_ep_t ep, psm2_mq_req_t *allreqs, int nreqs)
{
int i;
void *context = NULL;
// Ensure progress only once
psm2_poll(ep);
// Test for at least one completion and return it's context
psm2_mq_status2_t stat;
for (i = 0; i < nreqs; i++) {
if (psm2_mq_test2(&allreqs[i], &stat) == PSM2_OK) {
context = stat.context;
break;
}
}
return context;
}
@endcode
*/
psm2_error_t
psm2_mq_test2(psm2_mq_req_t *request, psm2_mq_status2_t *status);
/** @brief Cancel a preposted request
*
* Function to cancel a preposted receive request returned by @ref
* psm2_mq_irecv. It is currently illegal to cancel a send request initiated
* with @ref psm2_mq_isend.
*
* @pre The user has obtained a valid MQ request by calling @ref psm2_mq_isend.
*
* @post Whether the cancel is successful or not, the user returns the
* request to the library by way of @ref psm2_mq_test or @ref
* psm2_mq_wait.
*
* @remark This function may be called simultaneously from multiple threads
* as long as the requests that are used in each of the calls are
* associated with different MQs.
*
* Only the two following errors can be returned directly, without being
* handled by the error handler (@ref psm2_error_register_handler):
*
* @retval PSM2_OK The request could be successfully cancelled such that the
* preposted receive buffer could be removed from the preposted
* receive queue before a match occurred. The associated @c
* request remains unchanged and the user must still return
* the storage to the MQ library.
*
* @retval PSM2_MQ_NO_COMPLETIONS The request could not be successfully cancelled
* since the preposted receive buffer has already
* matched an incoming message. The @c request
* remains unchanged.
*
*/
psm2_error_t psm2_mq_cancel(psm2_mq_req_t *req);
/*! @brief MQ statistics structure */
struct psm2_mq_stats {
/** Bytes received into a matched user buffer */
uint64_t rx_user_bytes;
/** Messages received into a matched user buffer */
uint64_t rx_user_num;
/** Bytes received into an unmatched system buffer */
uint64_t rx_sys_bytes;
/** Messages received into an unmatched system buffer */
uint64_t rx_sys_num;
/** Total Messages transmitted (shm and hfi) */
uint64_t tx_num;
/** Messages transmitted eagerly */
uint64_t tx_eager_num;
/** Bytes transmitted eagerly */
uint64_t tx_eager_bytes;
/** Messages transmitted using expected TID mechanism */
uint64_t tx_rndv_num;
/** Bytes transmitted using expected TID mechanism */
uint64_t tx_rndv_bytes;
/** Messages transmitted (shm only) */
uint64_t tx_shm_num;
/** Messages received through shm */
uint64_t rx_shm_num;
/** Number of system buffers allocated */
uint64_t rx_sysbuf_num;
/** Bytes allcoated for system buffers */
uint64_t rx_sysbuf_bytes;
/** Internally reserved for future use */
uint64_t _reserved[16];
};
#define PSM2_MQ_NUM_STATS 13 /**< How many stats are currently used in @ref psm2_mq_stats */
/*! @see psm2_mq_stats */
typedef struct psm2_mq_stats psm2_mq_stats_t;
/** @brief Retrieve statistics from an instantiated MQ */
void
psm2_mq_get_stats(psm2_mq_t mq, psm2_mq_stats_t *stats);
/*! @} */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif