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36 lines
874 B
36 lines
874 B
4 months ago
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// RUN: %clang_tsan %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
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#include "dispatch/dispatch.h"
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#include <stdio.h>
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#include <assert.h>
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int main() {
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fprintf(stderr, "start\n");
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dispatch_semaphore_t done = dispatch_semaphore_create(0);
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dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
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assert(background_q != serial_q);
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dispatch_async(background_q, ^{
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__block long block_var = 0;
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dispatch_sync(serial_q, ^{
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block_var = 42;
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});
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fprintf(stderr, "block_var = %ld\n", block_var);
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dispatch_semaphore_signal(done);
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});
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dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
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fprintf(stderr, "done\n");
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}
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// CHECK: start
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// CHECK: block_var = 42
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// CHECK: done
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