int
ompi_osc_sm_start(struct ompi_group_t *group,
int assert,
struct ompi_win_t *win)
{
ompi_osc_sm_module_t *module =
(ompi_osc_sm_module_t*) win->w_osc_module;
int my_rank = ompi_comm_rank (module->comm);
OBJ_RETAIN(group);
if (!OPAL_ATOMIC_CMPSET_PTR(&module->start_group, NULL, group)) {
OBJ_RELEASE(group);
return OMPI_ERR_RMA_SYNC;
}
if (0 == (assert & MPI_MODE_NOCHECK)) {
int size;
int *ranks = ompi_osc_sm_group_ranks (module->comm->c_local_group, group);
if (NULL == ranks) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
size = ompi_group_size(module->start_group);
for (int i = 0 ; i < size ; ++i) {
int rank_byte = ranks[i] >> 6;
uint64_t old, rank_bit = ((uint64_t) 1) << (ranks[i] & 0x3f);
/* wait for rank to post */
while (!(module->posts[my_rank][rank_byte] & rank_bit)) {
opal_progress();
opal_atomic_mb();
}
opal_atomic_rmb ();
do {
old = module->posts[my_rank][rank_byte];
} while (!opal_atomic_cmpset_64 ((int64_t *) module->posts[my_rank] + rank_byte, old, old ^ rank_bit));
}
free (ranks);
}
int main(int argc, char *argv[])
{
#if OPAL_HAVE_POSIX_THREADS
int tid;
pthread_t *th;
#endif
if (argc != 2) {
printf("*** Incorrect number of arguments. Skipping test\n");
return 77;
}
nthreads = atoi(argv[1]);
/* first test single-threaded functionality */
/* -- cmpset 32-bit tests -- */
vol32 = 42, old32 = 42, new32 = 50;
assert(opal_atomic_cmpset_32(&vol32, old32, new32) == 1);
opal_atomic_rmb();
assert(vol32 == new32);
vol32 = 42, old32 = 420, new32 = 50;
assert(opal_atomic_cmpset_32(&vol32, old32, new32) == 0);
opal_atomic_rmb();
assert(vol32 == 42);
vol32 = 42, old32 = 42, new32 = 50;
assert(opal_atomic_cmpset_acq_32(&vol32, old32, new32) == 1);
assert(vol32 == new32);
vol32 = 42, old32 = 420, new32 = 50;
assert(opal_atomic_cmpset_acq_32(&vol32, old32, new32) == 0);
assert(vol32 == 42);
vol32 = 42, old32 = 42, new32 = 50;
assert(opal_atomic_cmpset_rel_32(&vol32, old32, new32) == 1);
opal_atomic_rmb();
assert(vol32 == new32);
vol32 = 42, old32 = 420, new32 = 50;
assert(opal_atomic_cmpset_rel_32(&vol32, old32, new32) == 0);
opal_atomic_rmb();
assert(vol32 == 42);
/* -- cmpset 64-bit tests -- */
#if OPAL_HAVE_ATOMIC_MATH_64
vol64 = 42, old64 = 42, new64 = 50;
assert(1 == opal_atomic_cmpset_64(&vol64, old64, new64));
opal_atomic_rmb();
assert(new64 == vol64);
vol64 = 42, old64 = 420, new64 = 50;
assert(opal_atomic_cmpset_64(&vol64, old64, new64) == 0);
opal_atomic_rmb();
assert(vol64 == 42);
vol64 = 42, old64 = 42, new64 = 50;
assert(opal_atomic_cmpset_acq_64(&vol64, old64, new64) == 1);
assert(vol64 == new64);
vol64 = 42, old64 = 420, new64 = 50;
assert(opal_atomic_cmpset_acq_64(&vol64, old64, new64) == 0);
assert(vol64 == 42);
vol64 = 42, old64 = 42, new64 = 50;
assert(opal_atomic_cmpset_rel_64(&vol64, old64, new64) == 1);
opal_atomic_rmb();
assert(vol64 == new64);
vol64 = 42, old64 = 420, new64 = 50;
assert(opal_atomic_cmpset_rel_64(&vol64, old64, new64) == 0);
opal_atomic_rmb();
assert(vol64 == 42);
#endif
/* -- cmpset int tests -- */
volint = 42, oldint = 42, newint = 50;
assert(opal_atomic_cmpset(&volint, oldint, newint) == 1);
opal_atomic_rmb();
assert(volint ==newint);
volint = 42, oldint = 420, newint = 50;
assert(opal_atomic_cmpset(&volint, oldint, newint) == 0);
opal_atomic_rmb();
assert(volint == 42);
volint = 42, oldint = 42, newint = 50;
assert(opal_atomic_cmpset_acq(&volint, oldint, newint) == 1);
assert(volint == newint);
volint = 42, oldint = 420, newint = 50;
assert(opal_atomic_cmpset_acq(&volint, oldint, newint) == 0);
assert(volint == 42);
volint = 42, oldint = 42, newint = 50;
assert(opal_atomic_cmpset_rel(&volint, oldint, newint) == 1);
opal_atomic_rmb();
assert(volint == newint);
volint = 42, oldint = 420, newint = 50;
assert(opal_atomic_cmpset_rel(&volint, oldint, newint) == 0);
opal_atomic_rmb();
assert(volint == 42);
/* -- cmpset ptr tests -- */
volptr = (void *) 42, oldptr = (void *) 42, newptr = (void *) 50;
assert(opal_atomic_cmpset_ptr(&volptr, oldptr, newptr) == 1);
opal_atomic_rmb();
assert(volptr == newptr);
volptr = (void *) 42, oldptr = (void *) 420, newptr = (void *) 50;
assert(opal_atomic_cmpset_ptr(&volptr, oldptr, newptr) == 0);
opal_atomic_rmb();
assert(volptr == (void *) 42);
volptr = (void *) 42, oldptr = (void *) 42, newptr = (void *) 50;
assert(opal_atomic_cmpset_acq_ptr(&volptr, oldptr, newptr) == 1);
assert(volptr == newptr);
volptr = (void *) 42, oldptr = (void *) 420, newptr = (void *) 50;
assert(opal_atomic_cmpset_acq_ptr(&volptr, oldptr, newptr) == 0);
assert(volptr == (void *) 42);
volptr = (void *) 42, oldptr = (void *) 42, newptr = (void *) 50;
assert(opal_atomic_cmpset_rel_ptr(&volptr, oldptr, newptr) == 1);
opal_atomic_rmb();
assert(volptr == newptr);
volptr = (void *) 42, oldptr = (void *) 420, newptr = (void *) 50;
assert(opal_atomic_cmpset_rel_ptr(&volptr, oldptr, newptr) == 0);
opal_atomic_rmb();
assert(volptr == (void *) 42);
/* -- add_32 tests -- */
val32 = 42;
assert(opal_atomic_add_32(&val32, 5) == (42 + 5));
opal_atomic_rmb();
assert((42 + 5) == val32);
/* -- add_64 tests -- */
#if OPAL_HAVE_ATOMIC_MATH_64
val64 = 42;
assert(opal_atomic_add_64(&val64, 5) == (42 + 5));
opal_atomic_rmb();
assert((42 + 5) == val64);
#endif
/* -- add_int tests -- */
valint = 42;
opal_atomic_add(&valint, 5);
opal_atomic_rmb();
assert((42 + 5) == valint);
/* threaded tests */
val32 = 0;
#if OPAL_HAVE_ATOMIC_MATH_64
val64 = 0ul;
#endif
valint = 0;
/* -- create the thread set -- */
#if OPAL_HAVE_POSIX_THREADS
th = (pthread_t *) malloc(nthreads * sizeof(pthread_t));
if (!th) {
perror("malloc");
exit(EXIT_FAILURE);
}
for (tid = 0; tid < nthreads; tid++) {
if (pthread_create(&th[tid], NULL, thread_main, (void *) (unsigned long) tid) != 0) {
perror("pthread_create");
exit(EXIT_FAILURE);
}
}
/* -- wait for the thread set to finish -- */
for (tid = 0; tid < nthreads; tid++) {
void *thread_return;
if (pthread_join(th[tid], &thread_return) != 0) {
perror("pthread_join");
exit(EXIT_FAILURE);
}
}
free(th);
opal_atomic_rmb();
assert((5 * nthreads * nreps) == val32);
#if OPAL_HAVE_ATOMIC_MATH_64
opal_atomic_rmb();
assert((5 * nthreads * nreps) == val64);
#endif
opal_atomic_rmb();
assert((5 * nthreads * nreps) == valint);
#endif
return 0;
}