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// RUN: %clang_tsan %s -o %t
// RUN: %run %t 2>&1 | FileCheck %s
#include "dispatch/dispatch.h"
#include <stdio.h>
long global;
static const long nIter = 1000;
int main() {
fprintf(stderr, "Hello world.\n");
dispatch_semaphore_t done = dispatch_semaphore_create(0);
dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
global = 42;
for (int i = 0; i < nIter; i++) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_sync(serial_q, ^{
global = i;
if (i == nIter - 1) {
dispatch_semaphore_signal(done);
}
});
});
}
dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
fprintf(stderr, "Done.\n");
}
// CHECK: Hello world.
// CHECK: Done.
// CHECK-NOT: WARNING: ThreadSanitizer
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