e1ce3dabf0
We never noticed it because our CI doesn't actually build against a C library that doesn't have threading functionality, however building against a truly thread-free platform surfaces these issues. Differential Revision: https://reviews.llvm.org/D114242
53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: libcpp-has-no-threads
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// <mutex>
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// struct once_flag;
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// template<class Callable, class ...Args>
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// void call_once(once_flag& flag, Callable&& func, Args&&... args);
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// This test is supposed to be run with ThreadSanitizer and verifies that
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// call_once properly synchronizes user state, a data race that was fixed
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// in r280621.
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#include <mutex>
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#include <thread>
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#include <cassert>
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#include "make_test_thread.h"
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#include "test_macros.h"
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std::once_flag flg0;
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long global = 0;
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void init0()
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{
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++global;
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}
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void f0()
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{
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std::call_once(flg0, init0);
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assert(global == 1);
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}
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int main(int, char**)
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{
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std::thread t0 = support::make_test_thread(f0);
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std::thread t1 = support::make_test_thread(f0);
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t0.join();
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t1.join();
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assert(global == 1);
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return 0;
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}
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