int MPID_Iprobe(int source, int tag, MPID_Comm *comm, int context_offset,
int *flag, MPI_Status *status)
{
const int context = comm->recvcontext_id + context_offset;
int found = 0;
int mpi_errno = MPI_SUCCESS;
MPIDI_STATE_DECL(MPID_STATE_MPID_IPROBE);
MPIDI_FUNC_ENTER(MPID_STATE_MPID_IPROBE);
if (source == MPI_PROC_NULL)
{
MPIR_Status_set_procnull(status);
/* We set the flag to true because an MPI_Recv with this rank will
return immediately */
*flag = TRUE;
goto fn_exit;
}
/* Check to make sure the communicator hasn't already been revoked */
if (comm->revoked &&
MPIR_AGREE_TAG != MPIR_TAG_MASK_ERROR_BITS(tag & ~MPIR_Process.tagged_coll_mask) &&
MPIR_SHRINK_TAG != MPIR_TAG_MASK_ERROR_BITS(tag & ~MPIR_Process.tagged_coll_mask)) {
MPIU_ERR_SETANDJUMP(mpi_errno,MPIX_ERR_REVOKED,"**revoked");
}
#ifdef ENABLE_COMM_OVERRIDES
if (MPIDI_Anysource_iprobe_fn) {
if (source == MPI_ANY_SOURCE) {
/* if it's anysource, check shm, then check the network.
If still not found, call progress, and check again. */
/* check shm*/
MPIU_THREAD_CS_ENTER(MSGQUEUE,);
found = MPIDI_CH3U_Recvq_FU(source, tag, context, status);
MPIU_THREAD_CS_EXIT(MSGQUEUE,);
if (!found) {
/* not found, check network */
mpi_errno = MPIDI_Anysource_iprobe_fn(tag, comm, context_offset, &found, status);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
if (!found) {
/* still not found, make some progress*/
mpi_errno = MPIDI_CH3_Progress_poke();
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
/* check shm again */
MPIU_THREAD_CS_ENTER(MSGQUEUE,);
found = MPIDI_CH3U_Recvq_FU(source, tag, context, status);
MPIU_THREAD_CS_EXIT(MSGQUEUE,);
if (!found) {
/* check network again */
mpi_errno = MPIDI_Anysource_iprobe_fn(tag, comm, context_offset, &found, status);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
}
}
}
int MPID_Probe(int source, int tag, MPID_Comm * comm, int context_offset,
MPI_Status * status)
{
MPID_Progress_state progress_state;
const int context = comm->recvcontext_id + context_offset;
int mpi_errno = MPI_SUCCESS;
MPIDI_STATE_DECL(MPID_STATE_MPID_PROBE);
MPIDI_FUNC_ENTER(MPID_STATE_MPID_PROBE);
if (source == MPI_PROC_NULL)
{
MPIR_Status_set_procnull(status);
goto fn_exit;
}
#ifdef ENABLE_COMM_OVERRIDES
if (MPIDI_Anysource_iprobe_fn) {
if (source == MPI_ANY_SOURCE) {
/* if it's anysource, loop while checking the shm recv
queue and iprobing the netmod, then do a progress
test to make some progress. */
do {
int found;
MPIU_THREAD_CS_ENTER(MSGQUEUE,);
found = MPIDI_CH3U_Recvq_FU(source, tag, context, status);
MPIU_THREAD_CS_EXIT(MSGQUEUE,);
if (found) goto fn_exit;
mpi_errno = MPIDI_Anysource_iprobe_fn(tag, comm, context_offset, &found, status);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
if (found) goto fn_exit;
MPIU_THREAD_CS_YIELD(ALLFUNC,);
mpi_errno = MPIDI_CH3_Progress_test();
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
} while (1);
} else {
/* it's not anysource, see if this is for the netmod */
MPIDI_VC_t * vc;
MPIDI_Comm_get_vc_set_active(comm, source, &vc);
if (vc->comm_ops && vc->comm_ops->iprobe) {
/* netmod has overridden iprobe */
do {
int found;
mpi_errno = vc->comm_ops->iprobe(vc, source, tag, comm, context_offset, &found,
status);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
if (found) goto fn_exit;
MPIU_THREAD_CS_YIELD(ALLFUNC,);
mpi_errno = MPIDI_CH3_Progress_test();
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
} while (1);
}
/* fall-through to shm case */
}
}
