/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
#if !defined(MPIR_REQUEST_PTR_ARRAY_SIZE)
#define MPIR_REQUEST_PTR_ARRAY_SIZE 16
#endif
/* -- Begin Profiling Symbol Block for routine MPI_Waitsome */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Waitsome = PMPI_Waitsome
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Waitsome MPI_Waitsome
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Waitsome as PMPI_Waitsome
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Waitsome(int incount, MPI_Request array_of_requests[], int *outcount,
int array_of_indices[], MPI_Status array_of_statuses[])
__attribute__ ((weak, alias("PMPI_Waitsome")));
#endif
/* -- End Profiling Symbol Block */
/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Waitsome
#define MPI_Waitsome PMPI_Waitsome
#undef FUNCNAME
#define FUNCNAME MPIR_Waitsome_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Waitsome_impl(int incount, MPIR_Request * request_ptrs[],
int *outcount, int array_of_indices[], MPI_Status array_of_statuses[])
{
MPID_Progress_state progress_state;
int i;
int n_active;
int n_inactive;
int mpi_errno = MPI_SUCCESS;
/* Bill Gropp says MPI_Waitsome() is expected to try to make
* progress even if some requests have already completed;
* therefore, we kick the pipes once and then fall into a loop
* checking for completion and waiting for progress. */
mpi_errno = MPID_Progress_test();
if (mpi_errno != MPI_SUCCESS) {
/* --BEGIN ERROR HANDLING-- */
goto fn_fail;
/* --END ERROR HANDLING-- */
}
n_active = 0;
MPID_Progress_start(&progress_state);
for (;;) {
n_inactive = 0;
for (i = 0; i < incount; i++) {
if ((i + 1) % MPIR_CVAR_REQUEST_POLL_FREQ == 0) {
mpi_errno = MPID_Progress_test();
if (mpi_errno != MPI_SUCCESS) {
MPID_Progress_end(&progress_state);
goto fn_fail;
}
}
if (request_ptrs[i] != NULL) {
if (MPIR_Request_has_poll_fn(request_ptrs[i])) {
mpi_errno = MPIR_Grequest_poll(request_ptrs[i], &array_of_statuses[i]);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
}
if (MPIR_Request_is_complete(request_ptrs[i])) {
if (MPIR_Request_is_active(request_ptrs[i])) {
array_of_indices[n_active] = i;
n_active += 1;
} else {
request_ptrs[i] = NULL;
n_inactive += 1;
}
}
} else {
n_inactive += 1;
}
}
if (n_active > 0) {
*outcount = n_active;
break;
} else if (n_inactive == incount) {
*outcount = MPI_UNDEFINED;
break;
}
mpi_errno = MPID_Progress_test();
if (mpi_errno != MPI_SUCCESS) {
/* --BEGIN ERROR HANDLING-- */
MPID_Progress_end(&progress_state);
goto fn_fail;
/* --END ERROR HANDLING-- */
}
/* Avoid blocking other threads since I am inside an infinite loop */
MPID_THREAD_CS_YIELD(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
}
MPID_Progress_end(&progress_state);
fn_exit:
return mpi_errno;
fn_fail:
goto fn_exit;
}
#endif
#undef FUNCNAME
#define FUNCNAME MPI_Waitsome
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
MPI_Waitsome - Waits for some given MPI Requests to complete
Input Parameters:
+ incount - length of array_of_requests (integer)
- array_of_requests - array of requests (array of handles)
Output Parameters:
+ outcount - number of completed requests (integer)
. array_of_indices - array of indices of operations that
completed (array of integers)
- array_of_statuses - array of status objects for
operations that completed (array of Status). May be 'MPI_STATUSES_IGNORE'.
Notes:
The array of indicies are in the range '0' to 'incount - 1' for C and
in the range '1' to 'incount' for Fortran.
Null requests are ignored; if all requests are null, then the routine
returns with 'outcount' set to 'MPI_UNDEFINED'.
While it is possible to list a request handle more than once in the
array_of_requests, such an action is considered erroneous and may cause the
program to unexecpectedly terminate or produce incorrect results.
'MPI_Waitsome' provides an interface much like the Unix 'select' or 'poll'
calls and, in a high qualilty implementation, indicates all of the requests
that have completed when 'MPI_Waitsome' is called.
However, 'MPI_Waitsome' only guarantees that at least one
request has completed; there is no guarantee that `all` completed requests
will be returned, or that the entries in 'array_of_indices' will be in
increasing order. Also, requests that are completed while 'MPI_Waitsome' is
executing may or may not be returned, depending on the timing of the
completion of the message.
.N waitstatus
.N ThreadSafe
.N Fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_REQUEST
.N MPI_ERR_ARG
.N MPI_ERR_IN_STATUS
@*/
int MPI_Waitsome(int incount, MPI_Request array_of_requests[],
int *outcount, int array_of_indices[], MPI_Status array_of_statuses[])
{
MPIR_Request *request_ptr_array[MPIR_REQUEST_PTR_ARRAY_SIZE];
MPIR_Request **request_ptrs = request_ptr_array;
MPI_Status *status_ptr;
int i;
int n_inactive;
int active_flag;
int rc = MPI_SUCCESS;
int disabled_anysource = FALSE;
int mpi_errno = MPI_SUCCESS;
MPIR_CHKLMEM_DECL(1);
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_WAITSOME);
MPIR_ERRTEST_INITIALIZED_ORDIE();
MPID_THREAD_CS_ENTER(VNI_GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
MPIR_FUNC_TERSE_REQUEST_ENTER(MPID_STATE_MPI_WAITSOME);
/* Check the arguments */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_ERRTEST_COUNT(incount, mpi_errno);
if (incount != 0) {
MPIR_ERRTEST_ARGNULL(array_of_requests, "array_of_requests", mpi_errno);
MPIR_ERRTEST_ARGNULL(array_of_indices, "array_of_indices", mpi_errno);
/* NOTE: MPI_STATUSES_IGNORE != NULL */
MPIR_ERRTEST_ARGNULL(array_of_statuses, "array_of_statuses", mpi_errno);
}
MPIR_ERRTEST_ARGNULL(outcount, "outcount", mpi_errno);
for (i = 0; i < incount; i++) {
MPIR_ERRTEST_ARRAYREQUEST_OR_NULL(array_of_requests[i], i, mpi_errno);
}
}
MPID_END_ERROR_CHECKS;
}
#endif /* HAVE_ERROR_CHECKING */
/* ... body of routine ... */
*outcount = 0;
/* Convert MPI request handles to a request object pointers */
if (incount > MPIR_REQUEST_PTR_ARRAY_SIZE) {
MPIR_CHKLMEM_MALLOC_ORJUMP(request_ptrs, MPIR_Request **, incount * sizeof(MPIR_Request *),
mpi_errno, "request pointers", MPL_MEM_OBJECT);
}
n_inactive = 0;
for (i = 0; i < incount; i++) {
if (array_of_requests[i] != MPI_REQUEST_NULL) {
MPIR_Request_get_ptr(array_of_requests[i], request_ptrs[i]);
/* Validate object pointers if error checking is enabled */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_Request_valid_ptr(request_ptrs[i], mpi_errno);
if (mpi_errno != MPI_SUCCESS) {
goto fn_fail;
}
}
MPID_END_ERROR_CHECKS;
}
#endif
/* If one of the requests is an anysource on a communicator that's
* disabled such communication, convert this operation to a testall
* instead to prevent getting stuck in the progress engine. */
if (unlikely(MPIR_Request_is_anysrc_mismatched(request_ptrs[i]))) {
disabled_anysource = TRUE;
}
} else {
n_inactive += 1;
request_ptrs[i] = NULL;
}
}
if (n_inactive == incount) {
*outcount = MPI_UNDEFINED;
goto fn_exit;
}
if (unlikely(disabled_anysource)) {
mpi_errno =
MPI_Testsome(incount, array_of_requests, outcount, array_of_indices, array_of_statuses);
goto fn_exit;
}
mpi_errno = MPID_Waitsome(incount, request_ptrs, outcount, array_of_indices, array_of_statuses);
if (mpi_errno != MPI_SUCCESS) {
/* --BEGIN ERROR HANDLING-- */
goto fn_fail;
/* --END ERROR HANDLING-- */
}
if (*outcount == MPI_UNDEFINED)
goto fn_exit;
for (i = 0; i < *outcount; i++) {
int idx = array_of_indices[i];
status_ptr =
(array_of_statuses != MPI_STATUSES_IGNORE) ? &array_of_statuses[i] : MPI_STATUS_IGNORE;
rc = MPIR_Request_completion_processing(request_ptrs[idx], status_ptr, &active_flag);
if (!MPIR_Request_is_persistent(request_ptrs[idx])) {
MPIR_Request_free(request_ptrs[idx]);
array_of_requests[idx] = MPI_REQUEST_NULL;
}
if (rc == MPI_SUCCESS) {
request_ptrs[idx] = NULL;
} else {
mpi_errno = MPI_ERR_IN_STATUS;
if (status_ptr != MPI_STATUS_IGNORE) {
status_ptr->MPI_ERROR = rc;
}
}
}
if (mpi_errno == MPI_ERR_IN_STATUS) {
if (array_of_statuses != MPI_STATUSES_IGNORE) {
for (i = 0; i < *outcount; i++) {
if (request_ptrs[array_of_indices[i]] == NULL) {
array_of_statuses[i].MPI_ERROR = MPI_SUCCESS;
}
}
}
}
/* ... end of body of routine ... */
fn_exit:
if (incount > MPIR_REQUEST_PTR_ARRAY_SIZE) {
MPIR_CHKLMEM_FREEALL();
}
MPIR_FUNC_TERSE_REQUEST_EXIT(MPID_STATE_MPI_WAITSOME);
MPID_THREAD_CS_EXIT(VNI_GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
return mpi_errno;
fn_fail:
/* --BEGIN ERROR HANDLING-- */
#ifdef HAVE_ERROR_CHECKING
mpi_errno =
MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,
"**mpi_waitsome", "**mpi_waitsome %d %p %p %p %p", incount,
array_of_requests, outcount, array_of_indices, array_of_statuses);
#endif
mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
goto fn_exit;
/* --END ERROR HANDLING-- */
}