diff options
Diffstat (limited to 'final/runtime/test/worksharing/for/omp_for_nowait.c')
-rw-r--r-- | final/runtime/test/worksharing/for/omp_for_nowait.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/final/runtime/test/worksharing/for/omp_for_nowait.c b/final/runtime/test/worksharing/for/omp_for_nowait.c new file mode 100644 index 0000000..95a4775 --- /dev/null +++ b/final/runtime/test/worksharing/for/omp_for_nowait.c @@ -0,0 +1,77 @@ +// RUN: %libomp-compile-and-run +#include <stdio.h> +#include "omp_testsuite.h" + +/* + * This test will hang if the nowait is not working properly. + * + * It relies on a thread skipping to the second for construct to + * release the threads in the first for construct. + * + * Also, we use static scheduling to guarantee that one + * thread will make it to the second for construct. + */ +volatile int release; +volatile int count; + +void wait_for_release_then_increment(int rank) +{ + fprintf(stderr, "Thread nr %d enters first for construct" + " and waits.\n", rank); + while (release == 0); + #pragma omp atomic + count++; +} + +void release_and_increment(int rank) +{ + fprintf(stderr, "Thread nr %d sets release to 1\n", rank); + release = 1; + #pragma omp atomic + count++; +} + +int test_omp_for_nowait() +{ + release = 0; + count = 0; + + #pragma omp parallel num_threads(4) + { + int rank; + int i; + + rank = omp_get_thread_num(); + + #pragma omp for schedule(static) nowait + for (i = 0; i < 4; i++) { + if (i < 3) + wait_for_release_then_increment(rank); + else { + fprintf(stderr, "Thread nr %d enters first for and goes " + "immediately to the next for construct to release.\n", rank); + #pragma omp atomic + count++; + } + } + + #pragma omp for schedule(static) + for (i = 0; i < 4; i++) { + release_and_increment(rank); + } + } + return (count==8); +} + +int main() +{ + int i; + int num_failed=0; + + for(i = 0; i < REPETITIONS; i++) { + if(!test_omp_for_nowait()) { + num_failed++; + } + } + return num_failed; +} |