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Edit File : std_mutex.h \| Size : 9.08 KB
// std::mutex implementation -- C++ -- // Copyright (C) 2003-2018 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/>. /** @file bits/std_mutex.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{mutex} / #ifndef _GLIBCXX_MUTEX_H #define _GLIBCXX_MUTEX_H 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <system_error> #include <bits/functexcept.h> #include <bits/gthr.h> #include <bits/move.h> // for std::swap #ifdef _GLIBCXX_USE_C99_STDINT_TR1 namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * @defgroup mutexes Mutexes * @ingroup concurrency * * Classes for mutex support. * @{ / #ifdef _GLIBCXX_HAS_GTHREADS // Common base class for std::mutex and std::timed_mutex class __mutex_base { protected: typedef __gthread_mutex_t __native_type; #ifdef __GTHREAD_MUTEX_INIT __native_type _M_mutex = __GTHREAD_MUTEX_INIT; constexpr __mutex_base() noexcept = default; #else __native_type _M_mutex; __mutex_base() noexcept { // XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may) __GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex); } ~__mutex_base() noexcept { __gthread_mutex_destroy(&_M_mutex); } #endif __mutex_base(const __mutex_base&) = delete; __mutex_base& operator=(const __mutex_base&) = delete; }; /// The standard mutex type. class mutex : private __mutex_base { public: typedef __native_type native_handle_type; #ifdef __GTHREAD_MUTEX_INIT constexpr #endif mutex() noexcept = default; ~mutex() = default; mutex(const mutex&) = delete; mutex& operator=(const mutex&) = delete; void lock() { int __e = __gthread_mutex_lock(&_M_mutex); // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may) if (__e) __throw_system_error(__e); } bool try_lock() noexcept { // XXX EINVAL, EAGAIN, EBUSY return !__gthread_mutex_trylock(&_M_mutex); } void unlock() { // XXX EINVAL, EAGAIN, EPERM __gthread_mutex_unlock(&_M_mutex); } native_handle_type native_handle() noexcept { return &_M_mutex; } }; #endif // _GLIBCXX_HAS_GTHREADS /// Do not acquire ownership of the mutex. struct defer_lock_t { explicit defer_lock_t() = default; }; /// Try to acquire ownership of the mutex without blocking. struct try_to_lock_t { explicit try_to_lock_t() = default; }; /// Assume the calling thread has already obtained mutex ownership /// and manage it. struct adopt_lock_t { explicit adopt_lock_t() = default; }; /// Tag used to prevent a scoped lock from acquiring ownership of a mutex. _GLIBCXX17_INLINE constexpr defer_lock_t defer_lock { }; /// Tag used to prevent a scoped lock from blocking if a mutex is locked. _GLIBCXX17_INLINE constexpr try_to_lock_t try_to_lock { }; /// Tag used to make a scoped lock take ownership of a locked mutex. _GLIBCXX17_INLINE constexpr adopt_lock_t adopt_lock { }; /** @brief A simple scoped lock type. * * A lock_guard controls mutex ownership within a scope, releasing * ownership in the destructor. / template<typename _Mutex> class lock_guard { public: typedef _Mutex mutex_type; explicit lock_guard(mutex_type& __m) : _M_device(__m) { _M_device.lock(); } lock_guard(mutex_type& __m, adopt_lock_t) noexcept : _M_device(__m) { } // calling thread owns mutex ~lock_guard() { _M_device.unlock(); } lock_guard(const lock_guard&) = delete; lock_guard& operator=(const lock_guard&) = delete; private: mutex_type& _M_device; }; /* @brief A movable scoped lock type. * * A unique_lock controls mutex ownership within a scope. Ownership of the * mutex can be delayed until after construction and can be transferred * to another unique_lock by move construction or move assignment. If a * mutex lock is owned when the destructor runs ownership will be released. / template<typename _Mutex> class unique_lock { public: typedef _Mutex mutex_type; unique_lock() noexcept : _M_device(0), _M_owns(false) { } explicit unique_lock(mutex_type& __m) : _M_device(std::__addressof(__m)), _M_owns(false) { lock(); _M_owns = true; } unique_lock(mutex_type& __m, defer_lock_t) noexcept : _M_device(std::__addressof(__m)), _M_owns(false) { } unique_lock(mutex_type& __m, try_to_lock_t) : _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock()) { } unique_lock(mutex_type& __m, adopt_lock_t) noexcept : _M_device(std::__addressof(__m)), _M_owns(true) { // XXX calling thread owns mutex } template<typename _Clock, typename _Duration> unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __atime) : _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock_until(__atime)) { } template<typename _Rep, typename _Period> unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __rtime) : _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock_for(__rtime)) { } ~unique_lock() { if (_M_owns) unlock(); } unique_lock(const unique_lock&) = delete; unique_lock& operator=(const unique_lock&) = delete; unique_lock(unique_lock&& __u) noexcept : _M_device(__u._M_device), _M_owns(__u._M_owns) { __u._M_device = 0; __u._M_owns = false; } unique_lock& operator=(unique_lock&& __u) noexcept { if(_M_owns) unlock(); unique_lock(std::move(__u)).swap(this); __u._M_device = 0; __u._M_owns = false; return this; } void lock() { if (!_M_device) __throw_system_error(int(errc::operation_not_permitted)); else if (_M_owns) __throw_system_error(int(errc::resource_deadlock_would_occur)); else { _M_device->lock(); _M_owns = true; } } bool try_lock() { if (!_M_device) __throw_system_error(int(errc::operation_not_permitted)); else if (_M_owns) __throw_system_error(int(errc::resource_deadlock_would_occur)); else { _M_owns = _M_device->try_lock(); return _M_owns; } } template<typename _Clock, typename _Duration> bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime) { if (!_M_device) __throw_system_error(int(errc::operation_not_permitted)); else if (_M_owns) __throw_system_error(int(errc::resource_deadlock_would_occur)); else { _M_owns = _M_device->try_lock_until(__atime); return _M_owns; } } template<typename _Rep, typename _Period> bool try_lock_for(const chrono::duration<_Rep, _Period>& __rtime) { if (!_M_device) __throw_system_error(int(errc::operation_not_permitted)); else if (_M_owns) __throw_system_error(int(errc::resource_deadlock_would_occur)); else { _M_owns = _M_device->try_lock_for(__rtime); return _M_owns; } } void unlock() { if (!_M_owns) __throw_system_error(int(errc::operation_not_permitted)); else if (_M_device) { _M_device->unlock(); _M_owns = false; } } void swap(unique_lock& __u) noexcept { std::swap(_M_device, __u._M_device); std::swap(_M_owns, __u._M_owns); } mutex_type release() noexcept { mutex_type* __ret = _M_device; _M_device = 0; _M_owns = false; return __ret; } bool owns_lock() const noexcept { return _M_owns; } explicit operator bool() const noexcept { return owns_lock(); } mutex_type* mutex() const noexcept { return _M_device; } private: mutex_type* _M_device; bool _M_owns; // XXX use atomic_bool }; /// Swap overload for unique_lock objects. template<typename _Mutex> inline void swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) noexcept { __x.swap(__y); } // @} group mutexes _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // _GLIBCXX_USE_C99_STDINT_TR1 #endif // C++11 #endif // _GLIBCXX_MUTEX_H Back

Edit File : std_mutex.h | Size : 9.08 KB

// std::mutex implementation -*- C++ -*-

// Copyright (C) 2003-2018 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/>.

/** @file bits/std_mutex.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{mutex}
 */

#ifndef _GLIBCXX_MUTEX_H
#define _GLIBCXX_MUTEX_H 1

#pragma GCC system_header

#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else

#include <system_error>
#include <bits/functexcept.h>
#include <bits/gthr.h>
#include <bits/move.h> // for std::swap

#ifdef _GLIBCXX_USE_C99_STDINT_TR1

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @defgroup mutexes Mutexes
   * @ingroup concurrency
   *
   * Classes for mutex support.
   * @{
   */

#ifdef _GLIBCXX_HAS_GTHREADS
  // Common base class for std::mutex and std::timed_mutex
  class __mutex_base
  {
  protected:
    typedef __gthread_mutex_t			__native_type;

#ifdef __GTHREAD_MUTEX_INIT
    __native_type  _M_mutex = __GTHREAD_MUTEX_INIT;

constexpr __mutex_base() noexcept = default;
#else
    __native_type  _M_mutex;

__mutex_base() noexcept
    {
      // XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
      __GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
    }

~__mutex_base() noexcept { __gthread_mutex_destroy(&_M_mutex); }
#endif

__mutex_base(const __mutex_base&) = delete;
    __mutex_base& operator=(const __mutex_base&) = delete;
  };

/// The standard mutex type.
  class mutex : private __mutex_base
  {
  public:
    typedef __native_type* 			native_handle_type;

#ifdef __GTHREAD_MUTEX_INIT
    constexpr
#endif
    mutex() noexcept = default;
    ~mutex() = default;

mutex(const mutex&) = delete;
    mutex& operator=(const mutex&) = delete;

void
    lock()
    {
      int __e = __gthread_mutex_lock(&_M_mutex);

// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
      if (__e)
	__throw_system_error(__e);
    }

bool
    try_lock() noexcept
    {
      // XXX EINVAL, EAGAIN, EBUSY
      return !__gthread_mutex_trylock(&_M_mutex);
    }

void
    unlock()
    {
      // XXX EINVAL, EAGAIN, EPERM
      __gthread_mutex_unlock(&_M_mutex);
    }

native_handle_type
    native_handle() noexcept
    { return &_M_mutex; }
  };

#endif // _GLIBCXX_HAS_GTHREADS

/// Do not acquire ownership of the mutex.
  struct defer_lock_t { explicit defer_lock_t() = default; };

/// Try to acquire ownership of the mutex without blocking.
  struct try_to_lock_t { explicit try_to_lock_t() = default; };

/// Assume the calling thread has already obtained mutex ownership
  /// and manage it.
  struct adopt_lock_t { explicit adopt_lock_t() = default; };

/// Tag used to prevent a scoped lock from acquiring ownership of a mutex.
  _GLIBCXX17_INLINE constexpr defer_lock_t	defer_lock { };

/// Tag used to prevent a scoped lock from blocking if a mutex is locked.
  _GLIBCXX17_INLINE constexpr try_to_lock_t	try_to_lock { };

/// Tag used to make a scoped lock take ownership of a locked mutex.
  _GLIBCXX17_INLINE constexpr adopt_lock_t	adopt_lock { };

/** @brief A simple scoped lock type.
   *
   * A lock_guard controls mutex ownership within a scope, releasing
   * ownership in the destructor.
   */
  template<typename _Mutex>
    class lock_guard
    {
    public:
      typedef _Mutex mutex_type;

explicit lock_guard(mutex_type& __m) : _M_device(__m)
      { _M_device.lock(); }

lock_guard(mutex_type& __m, adopt_lock_t) noexcept : _M_device(__m)
      { } // calling thread owns mutex

~lock_guard()
      { _M_device.unlock(); }

lock_guard(const lock_guard&) = delete;
      lock_guard& operator=(const lock_guard&) = delete;

private:
      mutex_type&  _M_device;
    };

/** @brief A movable scoped lock type.
   *
   * A unique_lock controls mutex ownership within a scope. Ownership of the
   * mutex can be delayed until after construction and can be transferred
   * to another unique_lock by move construction or move assignment. If a
   * mutex lock is owned when the destructor runs ownership will be released.
   */
  template<typename _Mutex>
    class unique_lock
    {
    public:
      typedef _Mutex mutex_type;

unique_lock() noexcept
      : _M_device(0), _M_owns(false)
      { }

explicit unique_lock(mutex_type& __m)
      : _M_device(std::__addressof(__m)), _M_owns(false)
      {
	lock();
	_M_owns = true;
      }

unique_lock(mutex_type& __m, defer_lock_t) noexcept
      : _M_device(std::__addressof(__m)), _M_owns(false)
      { }

unique_lock(mutex_type& __m, try_to_lock_t)
      : _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock())
      { }

unique_lock(mutex_type& __m, adopt_lock_t) noexcept
      : _M_device(std::__addressof(__m)), _M_owns(true)
      {
	// XXX calling thread owns mutex
      }

template<typename _Clock, typename _Duration>
	unique_lock(mutex_type& __m,
		    const chrono::time_point<_Clock, _Duration>& __atime)
	: _M_device(std::__addressof(__m)),
	  _M_owns(_M_device->try_lock_until(__atime))
	{ }

template<typename _Rep, typename _Period>
	unique_lock(mutex_type& __m,
		    const chrono::duration<_Rep, _Period>& __rtime)
	: _M_device(std::__addressof(__m)),
	  _M_owns(_M_device->try_lock_for(__rtime))
	{ }

~unique_lock()
      {
	if (_M_owns)
	  unlock();
      }

unique_lock(const unique_lock&) = delete;
      unique_lock& operator=(const unique_lock&) = delete;

unique_lock(unique_lock&& __u) noexcept
      : _M_device(__u._M_device), _M_owns(__u._M_owns)
      {
	__u._M_device = 0;
	__u._M_owns = false;
      }

unique_lock& operator=(unique_lock&& __u) noexcept
      {
	if(_M_owns)
	  unlock();

unique_lock(std::move(__u)).swap(*this);

__u._M_device = 0;
	__u._M_owns = false;

return *this;
      }

void
      lock()
      {
	if (!_M_device)
	  __throw_system_error(int(errc::operation_not_permitted));
	else if (_M_owns)
	  __throw_system_error(int(errc::resource_deadlock_would_occur));
	else
	  {
	    _M_device->lock();
	    _M_owns = true;
	  }
      }

bool
      try_lock()
      {
	if (!_M_device)
	  __throw_system_error(int(errc::operation_not_permitted));
	else if (_M_owns)
	  __throw_system_error(int(errc::resource_deadlock_would_occur));
	else
	  {
	    _M_owns = _M_device->try_lock();
	    return _M_owns;
	  }
      }

template<typename _Clock, typename _Duration>
	bool
	try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{
	  if (!_M_device)
	    __throw_system_error(int(errc::operation_not_permitted));
	  else if (_M_owns)
	    __throw_system_error(int(errc::resource_deadlock_would_occur));
	  else
	    {
	      _M_owns = _M_device->try_lock_until(__atime);
	      return _M_owns;
	    }
	}

template<typename _Rep, typename _Period>
	bool
	try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{
	  if (!_M_device)
	    __throw_system_error(int(errc::operation_not_permitted));
	  else if (_M_owns)
	    __throw_system_error(int(errc::resource_deadlock_would_occur));
	  else
	    {
	      _M_owns = _M_device->try_lock_for(__rtime);
	      return _M_owns;
	    }
	 }

void
      unlock()
      {
	if (!_M_owns)
	  __throw_system_error(int(errc::operation_not_permitted));
	else if (_M_device)
	  {
	    _M_device->unlock();
	    _M_owns = false;
	  }
      }

void
      swap(unique_lock& __u) noexcept
      {
	std::swap(_M_device, __u._M_device);
	std::swap(_M_owns, __u._M_owns);
      }

mutex_type*
      release() noexcept
      {
	mutex_type* __ret = _M_device;
	_M_device = 0;
	_M_owns = false;
	return __ret;
      }

bool
      owns_lock() const noexcept
      { return _M_owns; }

explicit operator bool() const noexcept
      { return owns_lock(); }

mutex_type*
      mutex() const noexcept
      { return _M_device; }

private:
      mutex_type*	_M_device;
      bool		_M_owns; // XXX use atomic_bool
    };

/// Swap overload for unique_lock objects.
  template<typename _Mutex>
    inline void
    swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) noexcept
    { __x.swap(__y); }

// @} group mutexes
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // _GLIBCXX_USE_C99_STDINT_TR1

#endif // C++11

#endif // _GLIBCXX_MUTEX_H

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