1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: libcpp-has-no-threads 10 11 // <mutex> 12 13 // struct once_flag; 14 15 // template<class Callable, class ...Args> 16 // void call_once(once_flag& flag, Callable&& func, Args&&... args); 17 18 // This test is supposed to be run with ThreadSanitizer and verifies that 19 // call_once properly synchronizes user state, a data race that was fixed 20 // in r280621. 21 22 #include <mutex> 23 #include <thread> 24 #include <cassert> 25 26 #include "make_test_thread.h" 27 #include "test_macros.h" 28 29 std::once_flag flg0; 30 long global = 0; 31 init0()32void init0() 33 { 34 ++global; 35 } 36 f0()37void f0() 38 { 39 std::call_once(flg0, init0); 40 assert(global == 1); 41 } 42 main(int,char **)43int main(int, char**) 44 { 45 std::thread t0 = support::make_test_thread(f0); 46 std::thread t1 = support::make_test_thread(f0); 47 t0.join(); 48 t1.join(); 49 assert(global == 1); 50 51 return 0; 52 } 53