SHMEM_FADD(3) Open MPI SHMEM_FADD(3)
NAME
shmem_int4_fadd(3), shmem_int8_fadd(3), shmem_int_fadd(3),
shmem_long_fadd(3), shmem_longlong_fadd(3) - Performs an atomic
fetch-and-add operation on a remote data object
SYNOPSIS
C or C++:
#include <mpp/shmem.h>
int shmem_int_fadd(int *target, int value, int pe);
long shmem_long_fadd(long *target, long value, int pe);
long long shmem_longlong_fadd(long long *target, longlong value,
int pe);
Fortran:
INCLUDE "mpp/shmem.fh"
INTEGER pe
INTEGER(KIND=4) SHMEM_INT4_FADD, ires, target, value
ires = SHMEM_INT4_FADD(target, value, pe)
INTEGER(KIND=8) SHMEM_INT8_FADD, ires, target, value
ires = SHMEM_INT8_FADD(target, value, pe)
DESCRIPTION
shmem_fadd functions perform an atomic fetch-and-add operation. An
atomic fetch-and-add operation fetches the old target and adds value to
target without the possibility of another process updating target be-
tween the time of the fetch and the update. These routines add value
to target on Processing Element (PE) pe and return the previous con-
tents of target as an atomic operation.
The arguments are as follows:
target The remotely accessible integer data object to be updated on the
remote PE. The type of target should match that implied in the
SYNOPSIS section.
value The value to be atomically added to target. The type of value
should match that implied in the SYNOPSIS section.
pe An integer that indicates the PE number on which target is to be
updated. If you are using Fortran, it must be a default integer
value.
NOTES
The term remotely accessible is defined in intro_shmem(3).
RETURN VALUES
The contents that had been at the target address on the remote PE prior
to the atomic addition operation.
SEE ALSO
intro_shmem(3)
4.1.2 Nov 24, 2021 SHMEM_FADD(3)
Generated by dwww version 1.14 on Fri Jan 24 06:08:38 CET 2025.