1 // RUN: %clang_tsan %s -o %t 2 // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer' 3 4 #include "dispatch/dispatch.h" 5 6 #include <stdio.h> 7 8 long global; 9 10 static const long nIter = 1000; 11 main()12int main() { 13 fprintf(stderr, "Hello world.\n"); 14 dispatch_semaphore_t done = dispatch_semaphore_create(0); 15 16 dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL); 17 18 global = 42; 19 for (int i = 0; i < nIter; i++) { 20 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 21 dispatch_sync(serial_q, ^{ 22 global = i; 23 24 if (i == nIter - 1) { 25 dispatch_semaphore_signal(done); 26 } 27 }); 28 }); 29 } 30 31 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER); 32 fprintf(stderr, "Done.\n"); 33 } 34 35 // CHECK: Hello world. 36 // CHECK: Done. 37