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// RUN: %clangxx_tsan %s -o %t -framework Foundation
// RUN: %run %t 2>&1 | FileCheck %s
#import <Foundation/Foundation.h>
int main() {
fprintf(stderr, "start\n");
dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_queue_t main_q = dispatch_get_main_queue();
dispatch_async(background_q, ^{
__block long block_var = 0;
dispatch_sync(main_q, ^{
block_var = 42;
});
fprintf(stderr, "block_var = %ld\n", block_var);
dispatch_sync(dispatch_get_main_queue(), ^{
CFRunLoopStop(CFRunLoopGetCurrent());
});
});
CFRunLoopRun();
fprintf(stderr, "done\n");
}
// CHECK: start
// CHECK: block_var = 42
// CHECK: done
// CHECK-NOT: WARNING: ThreadSanitizer
// CHECK-NOT: CHECK failed
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