sync-race.c
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// 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() {
fprintf(stderr, "Hello world.\n");
print_address("addr=", 1, &global);
dispatch_semaphore_t done = dispatch_semaphore_create(0);
barrier_init(&barrier, 2);
dispatch_queue_t q1 = dispatch_queue_create("my.queue1", DISPATCH_QUEUE_CONCURRENT);
dispatch_queue_t q2 = dispatch_queue_create("my.queue2", DISPATCH_QUEUE_CONCURRENT);
global = 42;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_sync(q1, ^{
global = 43;
barrier_wait(&barrier);
});
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_sync(q2, ^{
barrier_wait(&barrier);
global = 44;
dispatch_semaphore_signal(done);
});
});
dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
fprintf(stderr, "Done.\n");
}
// CHECK: Hello world.
// CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (sync-race.c.tmp+0x{{[0-9,a-f]+}})
// CHECK: Done.