| 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 | // <condition_variable> |
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| 12 | |
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| 13 | // class condition_variable_any; |
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| 14 | |
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| 15 | // void notify_all(); |
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| 16 | |
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| 17 | #include <condition_variable> |
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| 18 | #include <mutex> |
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| 19 | #include <thread> |
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| 20 | #include <vector> |
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| 21 | #include <atomic> |
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| 22 | #include <cassert> |
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| 23 | |
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| 24 | #include "make_test_thread.h" |
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| 25 | #include "test_macros.h" |
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| 26 | |
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| 27 | std::condition_variable_any cv; |
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| 28 | |
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| 29 | typedef std::timed_mutex L0; |
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| 30 | typedef std::unique_lock<L0> L1; |
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| 31 | |
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| 32 | L0 m0; |
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| 33 | |
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| 34 | const unsigned threadCount = 2; |
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| 35 | bool pleaseExit = false; |
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| 36 | std::atomic<unsigned> notReady; |
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| 37 | |
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| 38 | void helper() { |
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| 39 | L1 lk(m0); |
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| 40 | --notReady; |
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| 41 | while (pleaseExit == false) |
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| 42 | cv.wait(lock&: lk); |
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| 43 | } |
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| 44 | |
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| 45 | int main(int, char**) |
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| 46 | { |
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| 47 | notReady = threadCount; |
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| 48 | std::vector<std::thread> threads(threadCount); |
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| 49 | for (unsigned i = 0; i < threadCount; i++) |
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| 50 | threads[i] = support::make_test_thread(helper); |
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| 51 | { |
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| 52 | while (notReady > 0) |
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| 53 | std::this_thread::yield(); |
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| 54 | // At this point, both threads have had a chance to acquire the lock and are |
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| 55 | // either waiting on the condition variable or about to wait. |
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| 56 | L1 lk(m0); |
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| 57 | pleaseExit = true; |
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| 58 | // POSIX does not guarantee reliable scheduling if notify_all is called |
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| 59 | // without the lock being held. |
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| 60 | cv.notify_all(); |
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| 61 | } |
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| 62 | // The test will hang if not all of the threads were woken. |
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| 63 | for (unsigned i = 0; i < threadCount; i++) |
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| 64 | threads[i].join(); |
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| 65 | |
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| 66 | return 0; |
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| 67 | } |
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| 68 | |
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