| 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 | #include <assert.h> |
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| 8 | |
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| 9 | int main() { |
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| 10 | fprintf(stderr, format: "start\n" ); |
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| 11 | dispatch_semaphore_t done = dispatch_semaphore_create(0); |
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| 12 | |
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| 13 | dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); |
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| 14 | dispatch_queue_t serial_q = dispatch_queue_create("my.queue" , DISPATCH_QUEUE_SERIAL); |
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| 15 | assert(background_q != serial_q); |
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| 16 | |
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| 17 | dispatch_async(background_q, ^{ |
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| 18 | __block long block_var = 0; |
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| 19 | |
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| 20 | dispatch_sync(serial_q, ^{ |
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| 21 | block_var = 42; |
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| 22 | }); |
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| 23 | |
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| 24 | fprintf(stderr, "block_var = %ld\n" , block_var); |
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| 25 | |
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| 26 | dispatch_semaphore_signal(done); |
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| 27 | }); |
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| 28 | |
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| 29 | dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER); |
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| 30 | fprintf(stderr, format: "done\n" ); |
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| 31 | } |
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| 32 | |
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| 33 | // CHECK: start |
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| 34 | // CHECK: block_var = 42 |
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| 35 | // CHECK: done |
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| 36 | |
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