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// RUN: %clang_tsan %s -o %t
// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
#include <dispatch/dispatch.h>
#include <stdio.h>
long global;
int main() {
fprintf(stderr, "Hello world.");
global = 42;
dispatch_semaphore_t sem = dispatch_semaphore_create(0);
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
global = 43;
dispatch_semaphore_signal(sem);
});
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
global = 44;
fprintf(stderr, "Done.");
return 0;
}
// CHECK: Hello world.
// CHECK: Done.
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