/* -*- 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_Waitany */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Waitany = PMPI_Waitany
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Waitany MPI_Waitany
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Waitany as PMPI_Waitany
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Waitany(int count, MPI_Request array_of_requests[], int *indx, MPI_Status * status)
__attribute__ ((weak, alias("PMPI_Waitany")));
#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_Waitany
#define MPI_Waitany PMPI_Waitany
#undef FUNCNAME
#define FUNCNAME MPIR_Waitany
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Waitany_impl(int count, MPIR_Request * request_ptrs[], int *indx, MPI_Status * status)
{
int mpi_errno = MPI_SUCCESS;
MPID_Progress_state progress_state;
int i;
int found_nonnull_req;
int n_inactive;
MPID_Progress_start(&progress_state);
for (;;) {
n_inactive = 0;
found_nonnull_req = FALSE;
for (i = 0; i < count; 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) {
++n_inactive;
continue;
}
/* we found at least one non-null request */
found_nonnull_req = TRUE;
if (MPIR_Request_has_poll_fn(request_ptrs[i])) {
mpi_errno = MPIR_Grequest_poll(request_ptrs[i], status);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
}
if (MPIR_Request_is_complete(request_ptrs[i])) {
if (MPIR_Request_is_active(request_ptrs[i])) {
*indx = i;
goto fn_exit;
} else {
++n_inactive;
request_ptrs[i] = NULL;
if (n_inactive == count) {
*indx = MPI_UNDEFINED;
/* status is set to empty by MPIR_Request_completion_processing */
goto fn_exit;
}
}
}
}
if (!found_nonnull_req) {
/* all requests were NULL */
*indx = MPI_UNDEFINED;
if (status != NULL) /* could be null if count=0 */
MPIR_Status_set_empty(status);
goto fn_exit;
}
mpi_errno = MPID_Progress_test();
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
/* Avoid blocking other threads since I am inside an infinite loop */
MPID_THREAD_CS_YIELD(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
}
fn_exit:
MPID_Progress_end(&progress_state);
return mpi_errno;
fn_fail:
goto fn_exit;
}
#endif
#undef FUNCNAME
#define FUNCNAME MPI_Waitany
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
MPI_Waitany - Waits for any specified MPI Request to complete
Input Parameters:
+ count - list length (integer)
- array_of_requests - array of requests (array of handles)
Output Parameters:
+ indx - index of handle for operation that completed (integer). In the
range '0' to 'count-1'. In Fortran, the range is '1' to 'count'.
- status - status object (Status). May be 'MPI_STATUS_IGNORE'.
Notes:
If all of the requests are 'MPI_REQUEST_NULL', then 'indx' is returned as
'MPI_UNDEFINED', and 'status' is returned as an empty status.
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.
.N waitstatus
.N ThreadSafe
.N Fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_REQUEST
.N MPI_ERR_ARG
@*/
int MPI_Waitany(int count, MPI_Request array_of_requests[], int *indx, MPI_Status * status)
{
MPIR_Request *request_ptr_array[MPIR_REQUEST_PTR_ARRAY_SIZE];
MPIR_Request **request_ptrs = request_ptr_array;
int i;
int active_flag;
int last_disabled_anysource = -1;
int first_nonnull = count;
int mpi_errno = MPI_SUCCESS;
MPIR_CHKLMEM_DECL(1);
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_WAITANY);
MPIR_ERRTEST_INITIALIZED_ORDIE();
MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
MPIR_FUNC_TERSE_REQUEST_ENTER(MPID_STATE_MPI_WAITANY);
/* Check the arguments */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_ERRTEST_COUNT(count, mpi_errno);
if (count != 0) {
MPIR_ERRTEST_ARGNULL(array_of_requests, "array_of_requests", mpi_errno);
/* NOTE: MPI_STATUS_IGNORE != NULL */
MPIR_ERRTEST_ARGNULL(status, "status", mpi_errno);
}
MPIR_ERRTEST_ARGNULL(indx, "indx", mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif /* HAVE_ERROR_CHECKING */
/* ... body of routine ... */
/* Convert MPI request handles to a request object pointers */
if (count > MPIR_REQUEST_PTR_ARRAY_SIZE) {
MPIR_CHKLMEM_MALLOC_ORJUMP(request_ptrs, MPIR_Request **, count * sizeof(MPIR_Request *),
mpi_errno, "request pointers", MPL_MEM_OBJECT);
}
*indx = MPI_UNDEFINED;
for (i = 0; i < count; i++) {
#ifdef HAVE_ERROR_CHECKING
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_ERRTEST_ARRAYREQUEST_OR_NULL(array_of_requests[i], i, mpi_errno);
}
MPID_END_ERROR_CHECKS;
#endif /* HAVE_ERROR_CHECKING */
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 (unlikely(MPIR_Request_is_anysrc_mismatched(request_ptrs[i]))) {
last_disabled_anysource = i;
}
/* Since waitany is likely to return as soon as a
* completed request is found, the first loop here is
* taking the longest. We can check for any completed
* request here, and we can poll from the first entry
* which is not null. */
if (MPIR_Request_is_complete(request_ptrs[i])) {
if (MPIR_Request_is_active(request_ptrs[i])) {
*indx = i;
break;
} else {
request_ptrs[i] = NULL;
}
} else {
if (first_nonnull == count)
first_nonnull = i;
}
} else {
request_ptrs[i] = NULL;
}
}
if (*indx == MPI_UNDEFINED) {
if (unlikely(last_disabled_anysource != -1)) {
int flag;
mpi_errno = MPI_Testany(count, array_of_requests, indx, &flag, status);
goto fn_exit;
}
mpi_errno = MPID_Waitany(count - first_nonnull, &request_ptrs[first_nonnull], indx, status);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
if (*indx != MPI_UNDEFINED) {
*indx += first_nonnull;
} else {
goto fn_exit;
}
}
mpi_errno = MPIR_Request_completion_processing(request_ptrs[*indx], status, &active_flag);
if (!MPIR_Request_is_persistent(request_ptrs[*indx])) {
MPIR_Request_free(request_ptrs[*indx]);
array_of_requests[*indx] = MPI_REQUEST_NULL;
}
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
/* ... end of body of routine ... */
fn_exit:
if (count > MPIR_REQUEST_PTR_ARRAY_SIZE) {
MPIR_CHKLMEM_FREEALL();
}
MPIR_FUNC_TERSE_REQUEST_EXIT(MPID_STATE_MPI_WAITANY);
MPID_THREAD_CS_EXIT(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_waitany",
"**mpi_waitany %d %p %p %p",
count, array_of_requests, indx, status);
#endif
mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
goto fn_exit;
/* --END ERROR HANDLING-- */
}