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