| 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 <stdio.h> |
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| 7 | |
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| 8 | long global; |
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| 9 | |
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| 10 | static const long nIter = 1000; |
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| 11 | |
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| 12 | int main() { |
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| 13 | fprintf(stderr, format: "Hello world.\n" ); |
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| 14 | dispatch_semaphore_t done = dispatch_semaphore_create(0); |
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| 15 | |
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| 16 | dispatch_queue_t serial_q = dispatch_queue_create("my.queue" , DISPATCH_QUEUE_SERIAL); |
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| 17 | |
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| 18 | global = 42; |
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| 19 | for (int i = 0; i < nIter; i++) { |
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| 20 | dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ |
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| 21 | dispatch_sync(serial_q, ^{ |
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| 22 | global = i; |
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| 23 | |
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| 24 | if (i == nIter - 1) { |
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| 25 | dispatch_semaphore_signal(done); |
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| 26 | } |
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| 27 | }); |
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| 28 | }); |
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| 29 | } |
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| 30 | |
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| 31 | dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER); |
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| 32 | fprintf(stderr, format: "Done.\n" ); |
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| 33 | } |
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| 34 | |
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| 35 | // CHECK: Hello world. |
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| 36 | // CHECK: Done. |
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| 37 | |
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