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55 lines
1008 B
55 lines
1008 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 "../test.h"
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static const long kNumThreads = 4;
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long global;
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long global2;
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static dispatch_once_t once_token;
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static dispatch_once_t once_token2;
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void f(void *a) {
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global2 = 42;
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usleep(100000);
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}
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void *Thread(void *a) {
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barrier_wait(&barrier);
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dispatch_once(&once_token, ^{
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global = 42;
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usleep(100000);
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});
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long x = global;
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dispatch_once_f(&once_token2, NULL, f);
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long x2 = global2;
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fprintf(stderr, "global = %ld\n", x);
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fprintf(stderr, "global2 = %ld\n", x2);
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return 0;
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}
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int main() {
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fprintf(stderr, "Hello world.\n");
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barrier_init(&barrier, kNumThreads);
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pthread_t t[kNumThreads];
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for (int i = 0; i < kNumThreads; i++) {
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pthread_create(&t[i], 0, Thread, 0);
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}
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for (int i = 0; i < kNumThreads; i++) {
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pthread_join(t[i], 0);
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}
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fprintf(stderr, "Done.\n");
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}
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// CHECK: Hello world.
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// CHECK: Done.
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