osatomics-add.mm
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// RUN: %clangxx_tsan %s -o %t -framework Foundation -std=c++11
// RUN: %run %t 2>&1 | FileCheck %s
#import <Foundation/Foundation.h>
#import <libkern/OSAtomic.h>
#include <thread>
volatile int64_t retainCount = 0;
long g = 0;
void dealloc() {
g = 42;
}
void release() {
if (OSAtomicAdd64Barrier(-1, &retainCount) == 0) {
dealloc();
}
}
void retain() {
OSAtomicAdd64Barrier(1, &retainCount);
}
int main(int argc, const char * argv[]) {
fprintf(stderr, "start\n");
retain();
retain();
std::thread t([]{
release();
});
g = 47;
release();
t.join();
fprintf(stderr, "end, g = %ld\n", g);
return 0;
}
// CHECK: start
// CHECK: end, g = 42
// CHECK-NOT: WARNING: ThreadSanitizer