| 1 | // RUN: %clang_tsan %s -o %t |
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| 2 | // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer' |
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| 3 | |
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| 4 | #include <dispatch/dispatch.h> |
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| 5 | |
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| 6 | #include "../test.h" |
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| 7 | |
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| 8 | static const long kNumThreads = 4; |
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| 9 | |
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| 10 | long global; |
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| 11 | long global2; |
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| 12 | |
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| 13 | static dispatch_once_t once_token; |
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| 14 | static dispatch_once_t once_token2; |
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| 15 | |
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| 16 | void f(void *a) { |
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| 17 | global2 = 42; |
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| 18 | usleep(useconds: 100000); |
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| 19 | } |
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| 20 | |
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| 21 | void *Thread(void *a) { |
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| 22 | barrier_wait(barrier: &barrier); |
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| 23 | |
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| 24 | dispatch_once(&once_token, ^{ |
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| 25 | global = 42; |
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| 26 | usleep(useconds: 100000); |
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| 27 | }); |
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| 28 | long x = global; |
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| 29 | |
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| 30 | dispatch_once_f(&once_token2, NULL, f); |
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| 31 | long x2 = global2; |
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| 32 | |
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| 33 | fprintf(stderr, format: "global = %ld\n" , x); |
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| 34 | fprintf(stderr, format: "global2 = %ld\n" , x2); |
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| 35 | return 0; |
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| 36 | } |
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| 37 | |
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| 38 | int main() { |
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| 39 | fprintf(stderr, format: "Hello world.\n" ); |
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| 40 | barrier_init(barrier: &barrier, count: kNumThreads); |
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| 41 | |
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| 42 | pthread_t t[kNumThreads]; |
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| 43 | for (int i = 0; i < kNumThreads; i++) { |
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| 44 | pthread_create(newthread: &t[i], attr: 0, start_routine: Thread, arg: 0); |
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| 45 | } |
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| 46 | for (int i = 0; i < kNumThreads; i++) { |
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| 47 | pthread_join(th: t[i], thread_return: 0); |
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| 48 | } |
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| 49 | |
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| 50 | fprintf(stderr, format: "Done.\n" ); |
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| 51 | } |
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| 52 | |
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| 53 | // CHECK: Hello world. |
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| 54 | // CHECK: Done. |
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| 55 | |
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