22ac021be4
2008-05-14 Benjamin Kosnik <bkoz@redhat.com> * include/std/mutex (mutex::try_lock): Eat errors. (mutex::unlock): Same. (recursive_mutex::try_lock): Eat errors. (recursive_mutex::unlock): Same. * testsuite/30_threads/mutex/dest/destructor_locked.cc: Add -pthreads, adjust line numbers. * testsuite/30_threads/mutex/native_handle/1.cc: Same. * testsuite/30_threads/mutex/cons/1.cc: Same. * testsuite/30_threads/mutex/try_lock/1.cc: Same. * testsuite/30_threads/mutex/try_lock/2.cc: Same. * testsuite/30_threads/mutex/lock/1.cc: Same. * testsuite/30_threads/mutex/unlock/1.cc: Same. * testsuite/30_threads/recursive_mutex/dest/destructor_locked.cc: Same. * testsuite/30_threads/recursive_mutex/native_handle/1.cc: Same. * testsuite/30_threads/recursive_mutex/cons/1.cc: Same. From-SVN: r135321
368 lines
8.0 KiB
C++
368 lines
8.0 KiB
C++
// <mutex> -*- C++ -*-
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// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
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// 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 2, 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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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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// Boston, MA 02110-1301, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file mutex
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_MUTEX
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#define _GLIBCXX_MUTEX 1
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#pragma GCC system_header
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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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# include <c++0x_warning.h>
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#endif
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#include <exception>
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#include <cstddef>
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#include <bits/functexcept.h>
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#include <bits/gthr.h>
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namespace std
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{
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// XXX
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class system_time;
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/// mutex
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class mutex
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{
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public:
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typedef __gthread_mutex_t native_handle_type;
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mutex()
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{
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// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
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#if defined __GTHREAD_MUTEX_INIT
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native_handle_type __tmp = __GTHREAD_MUTEX_INIT;
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_M_mutex = __tmp;
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#else
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__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
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#endif
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}
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void
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lock()
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{
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int __e = __gthread_mutex_lock(&_M_mutex);
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// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
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if (__e)
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__throw_system_error(__e);
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}
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bool
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try_lock()
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{
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// XXX EINVAL, EAGAIN, EBUSY
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return !__gthread_mutex_trylock(&_M_mutex);
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}
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void
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unlock()
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{
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// XXX EINVAL, EAGAIN, EPERM
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__gthread_mutex_unlock(&_M_mutex);
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}
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native_handle_type
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native_handle()
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{ return _M_mutex; }
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private:
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native_handle_type _M_mutex;
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mutex(const mutex&);
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mutex& operator=(const mutex&);
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};
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/// recursive_mutex
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class recursive_mutex
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{
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public:
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typedef __gthread_recursive_mutex_t native_handle_type;
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recursive_mutex()
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{
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// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
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#if defined __GTHREAD_RECURSIVE_MUTEX_INIT
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native_handle_type __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
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_M_mutex = __tmp;
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#else
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__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
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#endif
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}
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void
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lock()
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{
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int __e = __gthread_recursive_mutex_lock(&_M_mutex);
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// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
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if (__e)
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__throw_system_error(__e);
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}
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bool
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try_lock()
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{
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// XXX EINVAL, EAGAIN, EBUSY
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return !__gthread_recursive_mutex_trylock(&_M_mutex);
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}
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void
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unlock()
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{
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// XXX EINVAL, EAGAIN, EBUSY
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__gthread_recursive_mutex_unlock(&_M_mutex);
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}
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native_handle_type
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native_handle() { return _M_mutex; }
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private:
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native_handle_type _M_mutex;
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recursive_mutex(const recursive_mutex&);
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recursive_mutex& operator=(const recursive_mutex&);
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};
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// class timed_mutex;
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// class recursive_timed_mutex;
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/// Do not acquire ownership of the mutex.
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struct defer_lock_t { };
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/// Try to acquire ownership of the mutex without blocking.
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struct try_to_lock_t { };
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/// Assume the calling thread has already obtained mutex ownership
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/// and manage it.
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struct adopt_lock_t { };
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extern const defer_lock_t defer_lock;
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extern const try_to_lock_t try_to_lock;
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extern const adopt_lock_t adopt_lock;
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/// Thrown to indicate errors with lock operations.
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class lock_error : public exception
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{
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public:
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virtual const char*
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what() const throw();
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};
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/// @brief Scoped lock idiom.
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// Acquire the mutex here with a constructor call, then release with
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// the destructor call in accordance with RAII style.
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template<typename _Mutex>
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class lock_guard
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{
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public:
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typedef _Mutex mutex_type;
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explicit lock_guard(mutex_type& __m) : _M_device(__m)
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{ _M_device.lock(); }
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lock_guard(mutex_type& __m, adopt_lock_t __a) : _M_device(__m)
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{ _M_device.lock(); }
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~lock_guard()
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{ _M_device.unlock(); }
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private:
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mutex_type& _M_device;
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lock_guard(lock_guard const&);
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lock_guard& operator=(lock_guard const&);
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};
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/// unique_lock
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template<typename _Mutex>
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class unique_lock
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{
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public:
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typedef _Mutex mutex_type;
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unique_lock() : _M_device(NULL), _M_owns(false) { }
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explicit unique_lock(mutex_type& __m) : _M_device(&__m)
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{
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lock();
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_M_owns = true;
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}
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unique_lock(mutex_type& __m, defer_lock_t)
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: _M_device(&__m), _M_owns(false) { }
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unique_lock(mutex_type& __m, try_to_lock_t)
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: _M_device(&__m), _M_owns(_M_device->try_lock()) { }
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unique_lock(mutex_type& __m, adopt_lock_t)
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: _M_device(&__m), _M_owns(true)
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{
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// XXX calling thread owns mutex
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}
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unique_lock(mutex_type& __m, const system_time& abs_time);
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template<typename _Duration>
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unique_lock(mutex_type& __m, const _Duration& rel_time);
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~unique_lock()
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{
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if (_M_owns)
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unlock();
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}
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unique_lock(unique_lock&&);
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unique_lock& operator=(unique_lock&&);
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void
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lock()
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{
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if (_M_device && !_M_owns)
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_M_device->lock();
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else
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throw lock_error();
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}
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bool
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try_lock()
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{
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bool __ret = false;
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if (_M_device && !_M_owns)
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__ret = _M_device->try_lock();
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else
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throw lock_error();
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return __ret;
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}
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void
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unlock()
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{
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if (_M_device && _M_owns)
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_M_device->unlock();
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else
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throw lock_error();
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}
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template<typename _Duration>
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bool timed_lock(const _Duration& rel_time);
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bool
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timed_lock(const system_time& abs_time);
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void
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swap(unique_lock&& __u);
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mutex_type*
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release()
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{
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mutex_type* __ret = _M_device;
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_M_device = NULL;
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_M_owns = false;
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return __ret;
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}
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bool
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owns_lock() const { return _M_owns; }
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operator bool () const { return owns_lock(); }
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mutex_type*
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mutex() const
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{ return _M_device; }
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private:
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unique_lock(unique_lock const&);
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unique_lock& operator=(unique_lock const&);
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mutex_type* _M_device;
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bool _M_owns; // XXX use atomic_bool
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};
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template<typename _Mutex>
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void
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swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y);
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template<typename _Mutex>
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void
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swap(unique_lock<_Mutex>&& __x, unique_lock<_Mutex>& __y);
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template<typename _Mutex>
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void
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swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>&& __y);
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template<typename _L1, typename _L2, typename ..._L3>
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int
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try_lock(_L1&, _L2&, _L3&...);
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template<typename _L1, typename _L2, typename ..._L3>
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void
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lock(_L1&, _L2&, _L3&...);
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/// once_flag
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struct once_flag
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{
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typedef __gthread_once_t __native_type;
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once_flag()
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{
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__native_type __tmp = __GTHREAD_ONCE_INIT;
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_M_once = __tmp;
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}
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__native_type&
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_M_get() { return _M_once; }
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private:
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__native_type _M_once;
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once_flag(const once_flag&);
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once_flag& operator=(const once_flag&);
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};
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template<typename _Callable, typename... _Args>
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void
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call_once(once_flag& __once, _Callable __f, _Args&&... __args)
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{
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int __e = __gthread_once(&(__once._M_get()), __f(__args...));
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if (__e)
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__throw_system_error(__e);
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}
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}
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#endif
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