SHMEM\_QUIET(3)

NAME

shmem_quiet(3) - Waits for completion of all outstanding remote writes issued by a processing element (PE).

SYNOPSIS

C or C++:
#include <mpp/shmem.h>

void shmem_quiet(void);
Fortran:
CALL SHMEM_QUIET

DESCRIPTION

shmem_quiet ensures ordering of put (remote write) operations. All put operations issued to any processing element (PE) prior to the call to shmem_quiet are guaranteed to be visible to all other PEs no later than any subsequent memory load or store, remote put or get, or synchronization operations that follow the call to shmem_quiet.

NOTES

shmem_quiet is most useful as a way of ensuring ordering of delivery of several put operations. For example, you might use shmem_quiet to await delivery of a block of data before issuing another put, which sets a completion flag on another PE.
shmem_quiet is not usually needed if shmem_barrier_all(3) or shmem_barrier(3) are called. The barrier routines all wait for the completion of outstanding remote writes (puts).

EXAMPLES

PROGRAM COMPFLAG
  INCLUDE "mpp/shmem.fh"

  INTEGER FLAG_VAR, ARRAY(100), RECEIVER, SENDER
  COMMON/FLAG/FLAG_VAR
  COMMON/DATA/ARRAY
  INTRINSIC MY_PE

  FLAG_VAR = 0
  CALL SHMEM_BARRIER_ALL ! wait for FLAG_VAR to be initialized
  SENDER = 0                        ! PE 0 sends the data
  RECEIVER = 1                      ! PE 1 receives the data

  IF (MY_PE() .EQ. 0) THEN
    ARRAY = 33
    CALL SHMEM_PUT(ARRAY, ARRAY, 100, RECEIVER) ! start sending data
    CALL SHMEM_QUIET                ! wait for delivery
    CALL SHMEM_PUT(FLAG_VAR, 1, 1, RECEIVER) ! send completion flag
  ELSE IF (MY_PE() .EQ. RECEIVER) THEN
    CALL SHMEM_UDCFLUSH
    CALL SHMEM_WAIT(FLAG_VAR, 0)
    PRINT *,ARRAY                       ! ARRAY has been delivered
  ENDIF
END

SEE ALSO

intro_shmem(3), shmem_barrier(3), shmem_barrier_all(3), shmem_fence(3), shmem_put(3), shmem_wait(3)