File: osatomics-add.mm

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,634,792 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (48 lines) | stat: -rw-r--r-- 725 bytes parent folder | download | duplicates (40) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
// 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