46 lines · cpp
1// This test verifies that dispatch_sync() doesn't actually copy the block under TSan (without TSan, it doesn't).2 3// RUN: %clangxx_tsan %s -o %t_no_tsan -fno-sanitize=thread4// RUN: %clangxx_tsan %s -o %t_with_tsan5 6// RUN: %run %t_no_tsan 2>&1 | FileCheck %s7// RUN: %run %t_with_tsan 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'8 9#include <dispatch/dispatch.h>10 11#include <stdio.h>12 13struct MyClass {14 static int copyCount;15 static void printCopyCount() {16 fprintf(stderr, "copyCount = %d\n", copyCount);17 }18 MyClass(){};19 MyClass(const MyClass &obj) { copyCount++; };20 void foo() const {21 fprintf(stderr, "MyClass::foo\n");22 }23};24int MyClass::copyCount = 0;25 26int main(int argc, const char* argv[]) {27 dispatch_queue_t q = dispatch_queue_create("my.queue", NULL);28 MyClass obj;29 MyClass::printCopyCount();30 void (^block)(void) = ^{31 obj.foo();32 };33 MyClass::printCopyCount();34 dispatch_sync(q, block);35 MyClass::printCopyCount();36 37 fprintf(stderr, "Done.\n");38 return 0;39}40 41// CHECK: copyCount = 042// CHECK: copyCount = 143// CHECK: MyClass::foo44// CHECK: copyCount = 145// CHECK: Done.46