| // RUN: %clang_tsan %s -o %t |
| // RUN: %deflake %run %t 2>&1 | FileCheck %s |
| |
| #include <dispatch/dispatch.h> |
| |
| #include "../test.h" |
| |
| long global; |
| |
| int main(int argc, const char *argv[]) { |
| barrier_init(&barrier, 2); |
| fprintf(stderr, "start\n"); |
| |
| // Warm up GCD (workaround for macOS Sierra where dispatch_apply might run single-threaded). |
| dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ }); |
| |
| dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT); |
| dispatch_apply(2, q, ^(size_t i) { |
| global = i; |
| barrier_wait(&barrier); |
| }); |
| |
| fprintf(stderr, "done\n"); |
| return 0; |
| } |
| |
| // CHECK: start |
| // CHECK: WARNING: ThreadSanitizer: data race |
| // CHECK: Location is global 'global' |
| // CHECK: done |
