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| // condition_variable -*- C++ -*- |
| |
| // Copyright (C) 2008-2015 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include <condition_variable> |
| #include <cstdlib> |
| |
| #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| #ifdef __GTHREAD_COND_INIT |
| condition_variable::condition_variable() noexcept = default; |
| #else |
| condition_variable::condition_variable() noexcept |
| { |
| __GTHREAD_COND_INIT_FUNCTION(&_M_cond); |
| } |
| #endif |
| |
| condition_variable::~condition_variable() noexcept |
| { |
| // XXX no thread blocked |
| /* int __e = */ __gthread_cond_destroy(&_M_cond); |
| // if __e == EBUSY then blocked |
| } |
| |
| void |
| condition_variable::wait(unique_lock<mutex>& __lock) |
| { |
| int __e = __gthread_cond_wait(&_M_cond, __lock.mutex()->native_handle()); |
| |
| if (__e) |
| __throw_system_error(__e); |
| } |
| |
| void |
| condition_variable::notify_one() noexcept |
| { |
| int __e = __gthread_cond_signal(&_M_cond); |
| |
| // XXX not in spec |
| // EINVAL |
| if (__e) |
| __throw_system_error(__e); |
| } |
| |
| void |
| condition_variable::notify_all() noexcept |
| { |
| int __e = __gthread_cond_broadcast(&_M_cond); |
| |
| // XXX not in spec |
| // EINVAL |
| if (__e) |
| __throw_system_error(__e); |
| } |
| |
| extern void |
| __at_thread_exit(__at_thread_exit_elt*); |
| |
| namespace |
| { |
| __gthread_key_t key; |
| |
| void run(void* p) |
| { |
| auto elt = (__at_thread_exit_elt*)p; |
| while (elt) |
| { |
| auto next = elt->_M_next; |
| elt->_M_cb(elt); |
| elt = next; |
| } |
| } |
| |
| void run() |
| { |
| auto elt = (__at_thread_exit_elt*)__gthread_getspecific(key); |
| __gthread_setspecific(key, nullptr); |
| run(elt); |
| } |
| |
| struct notifier final : __at_thread_exit_elt |
| { |
| notifier(condition_variable& cv, unique_lock<mutex>& l) |
| : cv(&cv), mx(l.release()) |
| { |
| _M_cb = ¬ifier::run; |
| __at_thread_exit(this); |
| } |
| |
| ~notifier() |
| { |
| mx->unlock(); |
| cv->notify_all(); |
| } |
| |
| condition_variable* cv; |
| mutex* mx; |
| |
| static void run(void* p) { delete static_cast<notifier*>(p); } |
| }; |
| |
| |
| void key_init() { |
| struct key_s { |
| key_s() { __gthread_key_create (&key, run); } |
| ~key_s() { __gthread_key_delete (key); } |
| }; |
| static key_s ks; |
| // Also make sure the callbacks are run by std::exit. |
| std::atexit (run); |
| } |
| } |
| |
| void |
| __at_thread_exit(__at_thread_exit_elt* elt) |
| { |
| static __gthread_once_t once = __GTHREAD_ONCE_INIT; |
| __gthread_once (&once, key_init); |
| |
| elt->_M_next = (__at_thread_exit_elt*)__gthread_getspecific(key); |
| __gthread_setspecific(key, elt); |
| } |
| |
| void |
| notify_all_at_thread_exit(condition_variable& cv, unique_lock<mutex> l) |
| { |
| (void) new notifier{cv, l}; |
| } |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 |