| 1 | // RUN: %libomp-compile-and-run |
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| 2 | #include <stdio.h> |
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| 3 | #include "omp_testsuite.h" |
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| 4 | |
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| 5 | /* |
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| 6 | * This test will hang if the nowait is not working properly |
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| 7 | * |
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| 8 | * It relies on a one thread skipping to the last single construct to |
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| 9 | * release the threads in the first three single constructs |
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| 10 | */ |
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| 11 | volatile int release; |
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| 12 | volatile int count; |
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| 13 | |
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| 14 | void wait_for_release_then_increment(int rank) |
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| 15 | { |
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| 16 | fprintf(stderr, format: "Thread nr %d enters first section" |
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| 17 | " and waits.\n" , rank); |
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| 18 | while (release == 0); |
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| 19 | #pragma omp atomic |
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| 20 | count++; |
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| 21 | } |
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| 22 | |
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| 23 | void release_and_increment(int rank) |
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| 24 | { |
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| 25 | fprintf(stderr, format: "Thread nr %d sets release to 1\n" , rank); |
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| 26 | release = 1; |
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| 27 | #pragma omp atomic |
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| 28 | count++; |
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| 29 | } |
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| 30 | |
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| 31 | int test_omp_single_nowait() |
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| 32 | { |
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| 33 | release = 0; |
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| 34 | count = 0; |
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| 35 | |
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| 36 | #pragma omp parallel num_threads(4) |
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| 37 | { |
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| 38 | int rank; |
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| 39 | rank = omp_get_thread_num (); |
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| 40 | #pragma omp single nowait |
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| 41 | { |
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| 42 | wait_for_release_then_increment(rank); |
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| 43 | } |
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| 44 | #pragma omp single nowait |
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| 45 | { |
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| 46 | wait_for_release_then_increment(rank); |
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| 47 | } |
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| 48 | #pragma omp single nowait |
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| 49 | { |
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| 50 | wait_for_release_then_increment(rank); |
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| 51 | } |
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| 52 | |
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| 53 | #pragma omp single |
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| 54 | { |
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| 55 | release_and_increment(rank); |
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| 56 | } |
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| 57 | } |
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| 58 | // Check to make sure all four singles were executed |
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| 59 | return (count==4); |
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| 60 | } /* end of check_single_nowait*/ |
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| 61 | |
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| 62 | int main() |
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| 63 | { |
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| 64 | int i; |
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| 65 | int num_failed=0; |
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| 66 | |
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| 67 | for(i = 0; i < REPETITIONS; i++) { |
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| 68 | if(!test_omp_single_nowait()) { |
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| 69 | num_failed++; |
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| 70 | } |
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| 71 | } |
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| 72 | return num_failed; |
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| 73 | } |
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| 74 | |
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