Commit ed749773 authored by Kenneth Raffenetti's avatar Kenneth Raffenetti
Browse files

answer FIXME in comment for MPIDI_CH3U_Recvq_FDU

Signed-off-by: default avatarHalim Amer <>
parent d2680c3c
......@@ -318,8 +318,14 @@ MPID_Request * MPIDI_CH3U_Recvq_FDU(MPI_Request sreq_id,
/* Note that since this routine is used only in the case of send_cancel,
there can be only one match if at all. */
/* FIXME: Why doesn't this exit after it finds the first match? */
* there can be only one match, if at all. The reason the loop continues
* after finding a match is that send request handles are reused. In the
* case multiple requests with the same sender_req_id are present, only
* the last message is cancellable. This is because previous instances
* must have been tested or waited on the sender side, indicating completion
* and freeing the handle for reuse. Those completed operations cannot be
* cancelled.
cur_rreq = recvq_unexpected_head;
while (cur_rreq != NULL) {
MPIR_T_PVAR_TIMER_START(RECVQ, time_matching_unexpectedq);
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