61 lines · c
1// Check that dispatch_once() is always intercepted.2 3// RUN: %clang_tsan %s -o %t4// RUN: not %env_tsan_opts=ignore_noninstrumented_modules=0 %run %t 2>&1 | FileCheck %s5 6#include <dispatch/dispatch.h>7 8#include <pthread.h>9#include <stdio.h>10 11#include "../test.h"12 13long g = 0;14long h = 0;15 16__attribute__((disable_sanitizer_instrumentation))17void f() {18 static dispatch_once_t onceToken;19 dispatch_once(&onceToken, ^{20 g++;21 });22 h++;23}24 25// Required for dyld macOS 12.0+26#if (__APPLE__)27__attribute__((weak))28#endif29__attribute__((disable_sanitizer_instrumentation))30extern void31__tsan_on_report() {32 fprintf(stderr, "Report.\n");33 34 // Without these annotations this test deadlocks for COMPILER_RT_DEBUG=ON35 // builds. Conceptually, the TSan runtime does not support reentrancy from36 // runtime callbacks, but the main goal here is just to check that37 // dispatch_once() is always intercepted.38 AnnotateIgnoreSyncBegin(__FILE__, __LINE__);39 f();40 AnnotateIgnoreSyncEnd(__FILE__, __LINE__);41}42 43int main() {44 fprintf(stderr, "Hello world.\n");45 46 f();47 48 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;49 pthread_mutex_unlock(&mutex); // Unlock of an unlocked mutex50 51 fprintf(stderr, "g = %ld.\n", g);52 fprintf(stderr, "h = %ld.\n", h);53 fprintf(stderr, "Done.\n");54}55 56// CHECK: Hello world.57// CHECK: Report.58// CHECK: g = 159// CHECK: h = 260// CHECK: Done.61