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view libgomp/testsuite/libgomp.c/appendix-a/a.39.1.c @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | a06113de4d67 |
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/* { dg-do run } */ #include <stdio.h> #include <omp.h> void skip (int i) { } void work (int i) { } int main () { omp_lock_t lck; int id; omp_init_lock (&lck); #pragma omp parallel shared(lck) private(id) { id = omp_get_thread_num (); omp_set_lock (&lck); /* only one thread at a time can execute this printf */ printf ("My thread id is %d.\n", id); omp_unset_lock (&lck); while (!omp_test_lock (&lck)) { skip (id); /* we do not yet have the lock, so we must do something else */ } work (id); /* we now have the lock and can do the work */ omp_unset_lock (&lck); } omp_destroy_lock (&lck); return 0; }