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// Check that dispatch_once() is always intercepted.
// RUN: %clang_tsan %s -o %t
// RUN: not %env_tsan_opts=ignore_noninstrumented_modules=0 %run %t 2>&1 | FileCheck %s
#include <dispatch/dispatch.h>
#include <pthread.h>
#include <stdio.h>
#include "../test.h"
long g = 0;
long h = 0;
__attribute__((disable_sanitizer_instrumentation))
void f() {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
g++;
});
h++;
}
// Required for dyld macOS 12.0+
#if (__APPLE__)
__attribute__((weak))
#endif
__attribute__((disable_sanitizer_instrumentation))
extern void
__tsan_on_report() {
fprintf(stderr, "Report.\n");
// Without these annotations this test deadlocks for COMPILER_RT_DEBUG=ON
// builds. Conceptually, the TSan runtime does not support reentrancy from
// runtime callbacks, but the main goal here is just to check that
// dispatch_once() is always intercepted.
AnnotateIgnoreSyncBegin(__FILE__, __LINE__);
f();
AnnotateIgnoreSyncEnd(__FILE__, __LINE__);
}
int main() {
fprintf(stderr, "Hello world.\n");
f();
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_unlock(&mutex); // Unlock of an unlocked mutex
fprintf(stderr, "g = %ld.\n", g);
fprintf(stderr, "h = %ld.\n", h);
fprintf(stderr, "Done.\n");
}
// CHECK: Hello world.
// CHECK: Report.
// CHECK: g = 1
// CHECK: h = 2
// CHECK: Done.
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