| // RUN: %clang_tsan %s -o %t |
| // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer' |
| |
| #include "dispatch/dispatch.h" |
| |
| #include <stdio.h> |
| #include <assert.h> |
| |
| int main() { |
| fprintf(stderr, "start\n"); |
| dispatch_semaphore_t done = dispatch_semaphore_create(0); |
| |
| dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); |
| dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL); |
| assert(background_q != serial_q); |
| |
| dispatch_async(background_q, ^{ |
| __block long block_var = 0; |
| |
| dispatch_sync(serial_q, ^{ |
| block_var = 42; |
| }); |
| |
| fprintf(stderr, "block_var = %ld\n", block_var); |
| |
| dispatch_semaphore_signal(done); |
| }); |
| |
| dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER); |
| fprintf(stderr, "done\n"); |
| } |
| |
| // CHECK: start |
| // CHECK: block_var = 42 |
| // CHECK: done |