wait.c

刚才是说明 现在是安装程序在 LINUX环境下进行编程的MPICH安装文件

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"

/* -- Begin Profiling Symbol Block for routine MPI_Wait */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Wait = PMPI_Wait
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Wait  MPI_Wait
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Wait as PMPI_Wait
#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
#define MPI_Wait PMPI_Wait

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Wait

/*@
    MPI_Wait  - Waits for an MPI send or receive to complete

Input Parameter:
. request - request (handle) 

Output Parameter:
. status - status object (Status) .  May be 'MPI_STATUS_IGNORE'.

.N waitstatus

.N fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_REQUEST
.N MPI_ERR_ARG
@*/
int MPI_Wait(MPI_Request *request, MPI_Status *status)
{
    static const char FCNAME[] = "MPI_Wait";
    MPID_Request * request_ptr = NULL;
    int active_flag;
    int mpi_errno = MPI_SUCCESS;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_WAIT);

    /* Verify that MPI has been initialized */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_INITIALIZED(mpi_errno);
	    if (request != NULL)
	    {
		MPIR_ERRTEST_REQUEST(*request, mpi_errno);
	    }
            if (mpi_errno) {
                return MPIR_Err_return_comm( 0, FCNAME, mpi_errno );
            }
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */
	    
    MPID_MPI_PT2PT_FUNC_ENTER(MPID_STATE_MPI_WAIT);

    /* Check the arguments */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_REQUEST(request, mpi_errno);
	    /* NOTE: MPI_STATUS_IGNORE != NULL */
	    MPIR_ERRTEST_ARGNULL(status, "status", mpi_errno);
	    if (mpi_errno) {
		goto fn_exit;
            }
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */
    
    /* If this is a null request handle, then return an empty status */
    if (*request == MPI_REQUEST_NULL)
    {
	MPIR_Status_set_empty(status);
	goto fn_exit;
    }
    
    /* Convert MPI request handle to a request object pointer */
    MPID_Request_get_ptr(*request, request_ptr);
    
    /* Validate object pointers if error checking is enabled */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            MPID_Request_valid_ptr( request_ptr, mpi_errno );
            if (mpi_errno) {
		goto fn_exit;
            }
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    MPIR_Wait(request_ptr);
    mpi_errno = MPIR_Request_complete(request, request_ptr, status,
				      &active_flag);
    if (mpi_errno == MPI_SUCCESS)
    {
	mpi_errno = request_ptr->status.MPI_ERROR;
    }

  fn_exit:
    MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_WAIT);
    return (mpi_errno == MPI_SUCCESS) ? MPI_SUCCESS :
	MPIR_Err_return_comm(request_ptr?request_ptr->comm:0, FCNAME, mpi_errno);
}