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-rw-r--r--test/tsan/Darwin/gcd-once.mm55
1 files changed, 55 insertions, 0 deletions
diff --git a/test/tsan/Darwin/gcd-once.mm b/test/tsan/Darwin/gcd-once.mm
new file mode 100644
index 000000000000..17757d203751
--- /dev/null
+++ b/test/tsan/Darwin/gcd-once.mm
@@ -0,0 +1,55 @@
+// RUN: %clang_tsan %s -o %t -framework Foundation
+// RUN: %run %t 2>&1
+
+#import <Foundation/Foundation.h>
+
+#import "../test.h"
+
+static const long kNumThreads = 4;
+
+long global;
+long global2;
+
+static dispatch_once_t once_token;
+static dispatch_once_t once_token2;
+
+void f(void *) {
+ global2 = 42;
+ usleep(100000);
+}
+
+void *Thread(void *a) {
+ barrier_wait(&barrier);
+
+ dispatch_once(&once_token, ^{
+ global = 42;
+ usleep(100000);
+ });
+ long x = global;
+
+ dispatch_once_f(&once_token2, NULL, f);
+ long x2 = global2;
+
+ fprintf(stderr, "global = %ld\n", x);
+ fprintf(stderr, "global2 = %ld\n", x2);
+ return 0;
+}
+
+int main() {
+ fprintf(stderr, "Hello world.\n");
+ barrier_init(&barrier, kNumThreads);
+
+ pthread_t t[kNumThreads];
+ for (int i = 0; i < kNumThreads; i++) {
+ pthread_create(&t[i], 0, Thread, 0);
+ }
+ for (int i = 0; i < kNumThreads; i++) {
+ pthread_join(t[i], 0);
+ }
+
+ fprintf(stderr, "Done.\n");
+}
+
+// CHECK: Hello world.
+// CHECK: Done.
+// CHECK-NOT: WARNING: ThreadSanitizer