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159 lines
3.8 KiB
C++
159 lines
3.8 KiB
C++
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// condition_variable -*- C++ -*-
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// Copyright (C) 2008-2018 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <condition_variable>
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#include <cstdlib>
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#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#ifdef __GTHREAD_COND_INIT
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condition_variable::condition_variable() noexcept = default;
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#else
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condition_variable::condition_variable() noexcept
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{
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__GTHREAD_COND_INIT_FUNCTION(&_M_cond);
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}
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#endif
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condition_variable::~condition_variable() noexcept
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{
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// XXX no thread blocked
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/* int __e = */ __gthread_cond_destroy(&_M_cond);
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// if __e == EBUSY then blocked
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}
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void
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condition_variable::wait(unique_lock<mutex>& __lock) noexcept
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{
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int __e = __gthread_cond_wait(&_M_cond, __lock.mutex()->native_handle());
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if (__e)
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std::terminate();
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}
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void
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condition_variable::notify_one() noexcept
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{
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int __e = __gthread_cond_signal(&_M_cond);
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// XXX not in spec
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// EINVAL
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if (__e)
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__throw_system_error(__e);
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}
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void
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condition_variable::notify_all() noexcept
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{
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int __e = __gthread_cond_broadcast(&_M_cond);
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// XXX not in spec
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// EINVAL
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if (__e)
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__throw_system_error(__e);
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}
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extern void
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__at_thread_exit(__at_thread_exit_elt*);
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namespace
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{
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__gthread_key_t key;
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void run(void* p)
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{
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auto elt = (__at_thread_exit_elt*)p;
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while (elt)
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{
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auto next = elt->_M_next;
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elt->_M_cb(elt);
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elt = next;
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}
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}
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void run()
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{
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auto elt = (__at_thread_exit_elt*)__gthread_getspecific(key);
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__gthread_setspecific(key, nullptr);
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run(elt);
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}
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struct notifier final : __at_thread_exit_elt
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{
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notifier(condition_variable& cv, unique_lock<mutex>& l)
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: cv(&cv), mx(l.release())
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{
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_M_cb = ¬ifier::run;
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__at_thread_exit(this);
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}
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~notifier()
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{
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mx->unlock();
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cv->notify_all();
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}
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condition_variable* cv;
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mutex* mx;
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static void run(void* p) { delete static_cast<notifier*>(p); }
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};
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void key_init() {
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struct key_s {
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key_s() { __gthread_key_create (&key, run); }
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~key_s() { __gthread_key_delete (key); }
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};
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static key_s ks;
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// Also make sure the callbacks are run by std::exit.
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std::atexit (run);
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}
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}
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void
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__at_thread_exit(__at_thread_exit_elt* elt)
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{
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static __gthread_once_t once = __GTHREAD_ONCE_INIT;
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__gthread_once (&once, key_init);
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elt->_M_next = (__at_thread_exit_elt*)__gthread_getspecific(key);
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__gthread_setspecific(key, elt);
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}
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void
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notify_all_at_thread_exit(condition_variable& cv, unique_lock<mutex> l)
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{
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(void) new notifier{cv, l};
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
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