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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>
#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
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