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shmem_double_swap(3), shmem_float_swap(3), shmem_int_swap(3),
shmem_long_swap(3), shmem_swap(3), shmem_int4_swap(3), shmem_int8_swap(3),
shmem_real4_swap(3), shmem_real8_swap(3), shmem_longlong_swap(3) - Performs
an atomic swap to a remote data object
C or C++:
#include <mpp/shmem.h>
double shmem_double_swap(double *target, double value,
int pe);
float shmem_float_swap(float *target, float value, int pe);
int shmem_int_swap(int *target, int value, int pe);
long shmem_long_swap(long *target, long value, int pe);
long long shmem_longlong_swap(long long *target,
long long value, int pe);
long shmem_swap(long *target, long value, int pe);
Fortran:
INCLUDE "mpp/shmem.fh"
INTEGER pe
INTEGER SHMEM_SWAP
ires = SHMEM_SWAP(target, value, pe)
INTEGER(KIND=4) SHMEM_INT4_SWAP
ires = SHMEM_INT4_SWAP(target, value, pe)
INTEGER(KIND=8) SHMEM_INT8_SWAP
ires = SHMEM_INT8_SWAP(target, value, pe)
REAL(KIND=4) SHMEM_REAL4_SWAP
res = SHMEM_REAL4_SWAP(target, value, pe)
REAL(KIND=8) SHMEM_REAL8_SWAP
res = SHMEM_REAL8_SWAP(target, value, pe)
The atomic swap routines write value to address target on
PE pe, and return the previous contents of target in one atomic operation.
The arguments are as follows:
- target
- The remotely accessible integer data
object to be updated on the remote PE. If you are using C/C++, the type
of target should match that implied in the SYNOPSIS section. If you are
using Fortran, it must be of the following type:
- SHMEM_SWAP: Integer of
default kind
- SHMEM_INT4_SWAP: 4-byte integer
- SHMEM_INT8_SWAP: 8-byte integer
- SHMEM_REAL4_SWAP: 4-byte real
- SHMEM_REAL8_SWAP: 8-byte real
- value
- Value to
be atomically written to the remote PE. value is the same type as target.
- 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.
The
term remotely accessible is defined in intro_shmem(3).
The
contents that had been at the target address on the remote PE prior to
the swap is returned.
intro_shmem(3)
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