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72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
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//===----------------------------------------------------------------------===//
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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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#include <condition_variable>
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#include <thread>
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#if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
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# pragma comment(lib, "pthread")
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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// ~condition_variable is defined elsewhere.
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void condition_variable::notify_one() noexcept { __libcpp_condvar_signal(&__cv_); }
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void condition_variable::notify_all() noexcept { __libcpp_condvar_broadcast(&__cv_); }
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void condition_variable::wait(unique_lock<mutex>& lk) noexcept {
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if (!lk.owns_lock())
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__throw_system_error(EPERM, "condition_variable::wait: mutex not locked");
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int ec = __libcpp_condvar_wait(&__cv_, lk.mutex()->native_handle());
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if (ec)
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__throw_system_error(ec, "condition_variable wait failed");
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}
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void condition_variable::__do_timed_wait(unique_lock<mutex>& lk,
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chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) noexcept {
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using namespace chrono;
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if (!lk.owns_lock())
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__throw_system_error(EPERM, "condition_variable::timed wait: mutex not locked");
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nanoseconds d = tp.time_since_epoch();
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if (d > nanoseconds(0x59682F000000E941))
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d = nanoseconds(0x59682F000000E941);
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__libcpp_timespec_t ts;
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seconds s = duration_cast<seconds>(d);
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typedef decltype(ts.tv_sec) ts_sec;
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constexpr ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
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if (s.count() < ts_sec_max) {
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ts.tv_sec = static_cast<ts_sec>(s.count());
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ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
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} else {
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ts.tv_sec = ts_sec_max;
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ts.tv_nsec = giga::num - 1;
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}
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int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts);
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if (ec != 0 && ec != ETIMEDOUT)
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__throw_system_error(ec, "condition_variable timed_wait failed");
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}
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void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk) {
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auto& tl_ptr = __thread_local_data();
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// If this thread was not created using std::thread then it will not have
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// previously allocated.
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if (tl_ptr.get() == nullptr) {
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tl_ptr.set_pointer(new __thread_struct);
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}
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__thread_local_data()->notify_all_at_thread_exit(&cond, lk.release());
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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