text: /* -*- 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"
  
  /* -- Begin Profiling Symbol Block for routine MPI_Sendrecv */
  #if defined(HAVE_PRAGMA_WEAK)
  #pragma weak MPI_Sendrecv = PMPI_Sendrecv
  #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  #pragma _HP_SECONDARY_DEF PMPI_Sendrecv  MPI_Sendrecv
  #elif defined(HAVE_PRAGMA_CRI_DUP)
  #pragma _CRI duplicate MPI_Sendrecv as PMPI_Sendrecv
  #elif defined(HAVE_WEAK_ATTRIBUTE)
  int MPI_Sendrecv(const void *sendbuf, int sendcount, MPI_Datatype sendtype, int dest,
                   int sendtag, void *recvbuf, int recvcount, MPI_Datatype recvtype,
                   int source, int recvtag, MPI_Comm comm, MPI_Status * status)
      __attribute__ ((weak, alias("PMPI_Sendrecv")));
  #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_Sendrecv
  #define MPI_Sendrecv PMPI_Sendrecv
  
  #endif
  
  #undef FUNCNAME
  #define FUNCNAME MPI_Sendrecv
  #undef FCNAME
  #define FCNAME MPL_QUOTE(FUNCNAME)
  /*@
      MPI_Sendrecv - Sends and receives a message
  
  Input Parameters:
  + sendbuf - initial address of send buffer (choice)
  . sendcount - number of elements in send buffer (integer)
  . sendtype - type of elements in send buffer (handle)
  . dest - rank of destination (integer)
  . sendtag - send tag (integer)
  . recvcount - number of elements in receive buffer (integer)
  . recvtype - type of elements in receive buffer (handle)
  . source - rank of source (integer)
  . recvtag - receive tag (integer)
  - comm - communicator (handle)
  
  Output Parameters:
  + recvbuf - initial address of receive buffer (choice)
  - status - status object (Status).  This refers to the receive operation.
  
  .N ThreadSafe
  
  .N Fortran
  
  .N FortranStatus
  
  .N Errors
  .N MPI_SUCCESS
  .N MPI_ERR_COMM
  .N MPI_ERR_COUNT
  .N MPI_ERR_TYPE
  .N MPI_ERR_TAG
  .N MPI_ERR_RANK
  
  @*/
  int MPI_Sendrecv(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
                   int dest, int sendtag,
                   void *recvbuf, int recvcount, MPI_Datatype recvtype,
                   int source, int recvtag, MPI_Comm comm, MPI_Status * status)
  {
      int mpi_errno = MPI_SUCCESS;
      MPIR_Comm *comm_ptr = NULL;
      MPIR_Request *sreq = NULL;
      MPIR_Request *rreq = NULL;
      MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_SENDRECV);
  
      MPIR_ERRTEST_INITIALIZED_ORDIE();
  
      MPID_THREAD_CS_ENTER(VNI_GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
      MPIR_FUNC_TERSE_PT2PT_ENTER_BOTH(MPID_STATE_MPI_SENDRECV);
  
      /* Validate handle parameters needing to be converted */
  #ifdef HAVE_ERROR_CHECKING
      {
          MPID_BEGIN_ERROR_CHECKS;
          {
              MPIR_ERRTEST_COMM(comm, mpi_errno);
          }
          MPID_END_ERROR_CHECKS;
      }
  #endif /* HAVE_ERROR_CHECKING */
  
      /* Convert handles to MPI objects. */
      MPIR_Comm_get_ptr(comm, comm_ptr);
  
  #ifdef HAVE_ERROR_CHECKING
      {
          MPID_BEGIN_ERROR_CHECKS;
          {
              /* Validate communicator */
              MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, FALSE);
              if (mpi_errno)
                  goto fn_fail;
  
              /* Validate count */
              MPIR_ERRTEST_COUNT(sendcount, mpi_errno);
              MPIR_ERRTEST_COUNT(recvcount, mpi_errno);
  
              /* Validate status (status_ignore is not the same as null) */
              MPIR_ERRTEST_ARGNULL(status, "status", mpi_errno);
  
              /* Validate tags */
              MPIR_ERRTEST_SEND_TAG(sendtag, mpi_errno);
              MPIR_ERRTEST_RECV_TAG(recvtag, mpi_errno);
  
              /* Validate source and destination */
              if (comm_ptr) {
                  MPIR_ERRTEST_SEND_RANK(comm_ptr, dest, mpi_errno);
                  MPIR_ERRTEST_RECV_RANK(comm_ptr, source, mpi_errno);
              }
  
              /* Validate datatype handles */
              MPIR_ERRTEST_DATATYPE(sendtype, "datatype", mpi_errno);
              MPIR_ERRTEST_DATATYPE(recvtype, "datatype", mpi_errno);
  
              /* Validate datatype objects */
              if (HANDLE_GET_KIND(sendtype) != HANDLE_KIND_BUILTIN) {
                  MPIR_Datatype *datatype_ptr = NULL;
  
                  MPIR_Datatype_get_ptr(sendtype, datatype_ptr);
                  MPIR_Datatype_valid_ptr(datatype_ptr, mpi_errno);
                  if (mpi_errno)
                      goto fn_fail;
                  MPIR_Datatype_committed_ptr(datatype_ptr, mpi_errno);
                  if (mpi_errno)
                      goto fn_fail;
              }
              if (HANDLE_GET_KIND(recvtype) != HANDLE_KIND_BUILTIN) {
                  MPIR_Datatype *datatype_ptr = NULL;
  
                  MPIR_Datatype_get_ptr(recvtype, datatype_ptr);
                  MPIR_Datatype_valid_ptr(datatype_ptr, mpi_errno);
                  if (mpi_errno)
                      goto fn_fail;
                  MPIR_Datatype_committed_ptr(datatype_ptr, mpi_errno);
                  if (mpi_errno)
                      goto fn_fail;
              }
  
              /* Validate buffers */
              MPIR_ERRTEST_USERBUFFER(sendbuf, sendcount, sendtype, mpi_errno);
              MPIR_ERRTEST_USERBUFFER(recvbuf, recvcount, recvtype, mpi_errno);
          }
          MPID_END_ERROR_CHECKS;
      }
  #endif /* HAVE_ERROR_CHECKING */
  
      /* ... body of routine ...  */
  
      mpi_errno =
          MPID_Irecv(recvbuf, recvcount, recvtype, source, recvtag, comm_ptr,
                     MPIR_CONTEXT_INTRA_PT2PT, &rreq);
      if (mpi_errno != MPI_SUCCESS)
          goto fn_fail;
  
      /* FIXME - Performance for small messages might be better if MPID_Send() were used here instead of MPID_Isend() */
      mpi_errno =
          MPID_Isend(sendbuf, sendcount, sendtype, dest, sendtag, comm_ptr, MPIR_CONTEXT_INTRA_PT2PT,
                     &sreq);
      if (mpi_errno != MPI_SUCCESS) {
          /* --BEGIN ERROR HANDLING-- */
          if (mpi_errno == MPIX_ERR_NOREQ)
              MPIR_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**nomem");
          /* FIXME: should we cancel the pending (possibly completed) receive request or wait for it to complete? */
          MPIR_Request_free(rreq);
          goto fn_fail;
          /* --END ERROR HANDLING-- */
      }
  
      if (!MPIR_Request_is_complete(sreq) || !MPIR_Request_is_complete(rreq)) {
          MPID_Progress_state progress_state;
  
          MPID_Progress_start(&progress_state);
          while (!MPIR_Request_is_complete(sreq) || !MPIR_Request_is_complete(rreq)) {
              mpi_errno = MPID_Progress_wait(&progress_state);
              if (mpi_errno != MPI_SUCCESS) {
                  /* --BEGIN ERROR HANDLING-- */
                  MPID_Progress_end(&progress_state);
                  goto fn_fail;
                  /* --END ERROR HANDLING-- */
              }
  
              if (unlikely(MPIR_Request_is_anysrc_mismatched(rreq))) {
                  /* --BEGIN ERROR HANDLING-- */
                  mpi_errno = MPIR_Request_handle_proc_failed(rreq);
                  if (!MPIR_Request_is_complete(sreq)) {
                      MPID_Cancel_send(sreq);
                      MPIR_STATUS_SET_CANCEL_BIT(sreq->status, FALSE);
                  }
                  goto fn_fail;
                  /* --END ERROR HANDLING-- */
              }
          }
          MPID_Progress_end(&progress_state);
      }
  
      mpi_errno = rreq->status.MPI_ERROR;
      MPIR_Request_extract_status(rreq, status);
      MPIR_Request_free(rreq);
  
      if (mpi_errno == MPI_SUCCESS) {
          mpi_errno = sreq->status.MPI_ERROR;
      }
      MPIR_Request_free(sreq);
  
      if (mpi_errno != MPI_SUCCESS)
          goto fn_fail;
  
      /* ... end of body of routine ... */
  
    fn_exit:
      MPIR_FUNC_TERSE_PT2PT_EXIT_BOTH(MPID_STATE_MPI_SENDRECV);
      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_sendrecv",
                                   "**mpi_sendrecv %p %d %D %i %t %p %d %D %i %t %C %p", sendbuf,
                                   sendcount, sendtype, dest, sendtag, recvbuf, recvcount, recvtype,
                                   source, recvtag, comm, status);
      }
  #endif
      mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);
      goto fn_exit;
      /* --END ERROR HANDLING-- */
  }
  