c92a253cf0
Before this patch, `try_acquire` blocks instead of returning false. This is because `__libcpp_thread_poll_with_backoff` interprets zero as meaning infinite, causing `try_acquire` to wait indefinitely. Thanks to Pablo Busse (pabusse) for the patch! Differential Revision: https://reviews.llvm.org/D98334
47 lines
1.2 KiB
C++
47 lines
1.2 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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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++03, c++11
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// This test requires the dylib support introduced in D68480, which shipped in
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// macOS 11.0.
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
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// TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
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// UNSUPPORTED: linux && 32bits-on-64bits
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// <semaphore>
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#include <cassert>
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#include <semaphore>
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#include <thread>
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#include "make_test_thread.h"
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#include "test_macros.h"
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int main(int, char**)
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{
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std::counting_semaphore<> s(1);
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assert(s.try_acquire());
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assert(!s.try_acquire());
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s.release();
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assert(s.try_acquire());
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assert(!s.try_acquire());
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s.release(2);
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std::thread t = support::make_test_thread([&](){
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assert(s.try_acquire());
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});
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t.join();
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assert(s.try_acquire());
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assert(!s.try_acquire());
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return 0;
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}
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