// <mutex> -*- C++ -*-
-// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
// 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 2, or (at your option)
+// 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,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License
-// along with this library; see the file COPYING. If not, write to
-// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-// Boston, MA 02110-1301, USA.
+// 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.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// 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 mutex
* This is a Standard C++ Library header.
# include <c++0x_warning.h>
#else
+#include <tuple>
#include <cstddef>
#include <chrono>
#include <exception>
namespace std
{
+ /**
+ * @defgroup mutexes Mutexes
+ * @ingroup concurrency
+ *
+ * Classes for mutex support.
+ * @{
+ */
+
/// mutex
class mutex
{
+ typedef __gthread_mutex_t __native_type;
+ __native_type _M_mutex;
+
public:
- typedef __gthread_mutex_t* native_handle_type;
+ typedef __native_type* native_handle_type;
mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
#ifdef __GTHREAD_MUTEX_INIT
- __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
+ __native_type __tmp = __GTHREAD_MUTEX_INIT;
_M_mutex = __tmp;
#else
__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
native_handle_type
native_handle()
{ return &_M_mutex; }
-
- private:
- __gthread_mutex_t _M_mutex;
};
/// recursive_mutex
class recursive_mutex
{
+ typedef __gthread_recursive_mutex_t __native_type;
+ __native_type _M_mutex;
+
public:
- typedef __gthread_recursive_mutex_t* native_handle_type;
+ typedef __native_type* native_handle_type;
recursive_mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
- __gthread_recursive_mutex_t __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
+ __native_type __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
_M_mutex = __tmp;
#else
__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
native_handle_type
native_handle()
{ return &_M_mutex; }
-
- private:
- __gthread_recursive_mutex_t _M_mutex;
};
/// timed_mutex
class timed_mutex
- {
+ {
+ typedef __gthread_mutex_t __native_type;
+
+#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
+ typedef chrono::monotonic_clock __clock_t;
+#else
+ typedef chrono::high_resolution_clock __clock_t;
+#endif
+
+ __native_type _M_mutex;
+
public:
- typedef __gthread_mutex_t* native_handle_type;
+ typedef __native_type* native_handle_type;
timed_mutex()
{
#ifdef __GTHREAD_MUTEX_INIT
- __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
+ __native_type __tmp = __GTHREAD_MUTEX_INIT;
_M_mutex = __tmp;
#else
__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
template <class _Clock, class _Duration>
bool
try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
- {
+ {
chrono::time_point<_Clock, chrono::seconds> __s =
- chrono::time_point_cast<chrono::seconds>(__atime);
+ chrono::time_point_cast<chrono::seconds>(__atime);
chrono::nanoseconds __ns =
- chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
+ chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
- __gthread_time_t __ts = {
- static_cast<std::time_t>(__s.time_since_epoch().count()),
- static_cast<long>(__ns.count())
- };
+ __gthread_time_t __ts = {
+ static_cast<std::time_t>(__s.time_since_epoch().count()),
+ static_cast<long>(__ns.count())
+ };
- return !__gthread_mutex_timedlock(&_M_mutex, &__ts);
+ return !__gthread_mutex_timedlock(&_M_mutex, &__ts);
}
void
native_handle_type
native_handle()
{ return &_M_mutex; }
-
- private:
- __gthread_mutex_t _M_mutex;
-
-#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
- typedef chrono::monotonic_clock __clock_t;
-#else
- typedef chrono::high_resolution_clock __clock_t;
-#endif
+ private:
template<typename _Rep, typename _Period>
typename enable_if<
- ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
+ ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
__try_lock_for_impl(const chrono::duration<_Rep, _Period>& __rtime)
{
- __clock_t::time_point __atime = __clock_t::now()
- + chrono::duration_cast<__clock_t::duration>(__rtime);
+ __clock_t::time_point __atime = __clock_t::now()
+ + chrono::duration_cast<__clock_t::duration>(__rtime);
- return try_lock_until(__atime);
+ return try_lock_until(__atime);
}
template <typename _Rep, typename _Period>
typename enable_if<
- !ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
+ !ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
__try_lock_for_impl(const chrono::duration<_Rep, _Period>& __rtime)
{
- __clock_t::time_point __atime = __clock_t::now()
+ __clock_t::time_point __atime = __clock_t::now()
+ ++chrono::duration_cast<__clock_t::duration>(__rtime);
- return try_lock_until(__atime);
+ return try_lock_until(__atime);
}
};
/// recursive_timed_mutex
class recursive_timed_mutex
{
+ typedef __gthread_recursive_mutex_t __native_type;
+
+#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
+ typedef chrono::monotonic_clock __clock_t;
+#else
+ typedef chrono::high_resolution_clock __clock_t;
+#endif
+
+ __native_type _M_mutex;
+
public:
- typedef __gthread_recursive_mutex_t* native_handle_type;
+ typedef __native_type* native_handle_type;
recursive_timed_mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
- __gthread_recursive_mutex_t __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
+ __native_type __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
_M_mutex = __tmp;
#else
__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
template <class _Clock, class _Duration>
bool
try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
- {
+ {
chrono::time_point<_Clock, chrono::seconds> __s =
- chrono::time_point_cast<chrono::seconds>(__atime);
+ chrono::time_point_cast<chrono::seconds>(__atime);
chrono::nanoseconds __ns =
- chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
+ chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
- __gthread_time_t __ts = {
- static_cast<std::time_t>(__s.time_since_epoch().count()),
- static_cast<long>(__ns.count())
- };
+ __gthread_time_t __ts = {
+ static_cast<std::time_t>(__s.time_since_epoch().count()),
+ static_cast<long>(__ns.count())
+ };
- return !__gthread_recursive_mutex_timedlock(&_M_mutex, &__ts);
+ return !__gthread_recursive_mutex_timedlock(&_M_mutex, &__ts);
}
void
{ return &_M_mutex; }
private:
- __gthread_recursive_mutex_t _M_mutex;
-
-#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
- typedef chrono::monotonic_clock __clock_t;
-#else
- typedef chrono::high_resolution_clock __clock_t;
-#endif
-
template<typename _Rep, typename _Period>
typename enable_if<
- ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
+ ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
__try_lock_for_impl(const chrono::duration<_Rep, _Period>& __rtime)
{
- __clock_t::time_point __atime = __clock_t::now()
- + chrono::duration_cast<__clock_t::duration>(__rtime);
+ __clock_t::time_point __atime = __clock_t::now()
+ + chrono::duration_cast<__clock_t::duration>(__rtime);
- return try_lock_until(__atime);
+ return try_lock_until(__atime);
}
template <typename _Rep, typename _Period>
typename enable_if<
- !ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
+ !ratio_less_equal<__clock_t::period, _Period>::value, bool>::type
__try_lock_for_impl(const chrono::duration<_Rep, _Period>& __rtime)
{
- __clock_t::time_point __atime = __clock_t::now()
+ __clock_t::time_point __atime = __clock_t::now()
+ ++chrono::duration_cast<__clock_t::duration>(__rtime);
- return try_lock_until(__atime);
+ return try_lock_until(__atime);
}
};
extern const try_to_lock_t try_to_lock;
extern const adopt_lock_t adopt_lock;
- /// Thrown to indicate errors with lock operations.
+ /**
+ * @brief Thrown to indicate errors with lock operations.
+ *
+ * @ingroup exceptions
+ */
class lock_error : public exception
{
public:
virtual const char*
- what() const throw();
+ _GLIBCXX_CONST what() const throw();
};
/// @brief Scoped lock idiom.
{
public:
typedef _Mutex mutex_type;
-
+
unique_lock()
: _M_device(0), _M_owns(false)
{ }
}
template<typename _Clock, typename _Duration>
- unique_lock(mutex_type& __m,
+ unique_lock(mutex_type& __m,
const chrono::time_point<_Clock, _Duration>& __atime)
: _M_device(&__m), _M_owns(_M_device->try_lock_until(__atime))
{ }
template<typename _Rep, typename _Period>
- unique_lock(mutex_type& __m,
+ unique_lock(mutex_type& __m,
const chrono::duration<_Rep, _Period>& __rtime)
: _M_device(&__m), _M_owns(_M_device->try_lock_for(__rtime))
{ }
unique_lock& operator=(unique_lock&& __u)
{
- if(_M_owns)
+ if(_M_owns)
unlock();
-
+
unique_lock(std::move(__u)).swap(*this);
__u._M_device = 0;
__u._M_owns = false;
-
+
return *this;
}
lock()
{
if (!_M_device)
- __throw_system_error(posix_error::operation_not_permitted);
+ __throw_system_error(int(errc::operation_not_permitted));
else if (_M_owns)
- __throw_system_error(posix_error::resource_deadlock_would_occur);
+ __throw_system_error(int(errc::resource_deadlock_would_occur));
else
{
_M_device->lock();
try_lock()
{
if (!_M_device)
- __throw_system_error(posix_error::operation_not_permitted);
- else if (_M_owns)
- __throw_system_error(posix_error::resource_deadlock_would_occur);
- else
+ __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();
+ _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)
- {
+ bool
+ try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
+ {
if (!_M_device)
- __throw_system_error(posix_error::operation_not_permitted);
+ __throw_system_error(int(errc::operation_not_permitted));
else if (_M_owns)
- __throw_system_error(posix_error::resource_deadlock_would_occur);
+ __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(posix_error::operation_not_permitted);
+ __throw_system_error(int(errc::operation_not_permitted));
else if (_M_owns)
- __throw_system_error(posix_error::resource_deadlock_would_occur);
+ __throw_system_error(int(errc::resource_deadlock_would_occur));
else
{
_M_owns = _M_device->try_lock_for(__rtime);
void
unlock()
{
- if (!_M_owns)
- __throw_system_error(posix_error::operation_not_permitted);
- else if (_M_device)
- {
- _M_device->unlock();
- _M_owns = false;
- }
+ 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)
{
swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>&& __y)
{ __x.swap(__y); }
- template<typename _L1, typename _L2, typename ..._L3>
+ template<int _Idx>
+ struct __unlock_impl
+ {
+ template<typename... _Lock>
+ static void
+ __do_unlock(tuple<_Lock&...>& __locks)
+ {
+ std::get<_Idx>(__locks).unlock();
+ __unlock_impl<_Idx - 1>::__do_unlock(__locks);
+ }
+ };
+
+ template<>
+ struct __unlock_impl<-1>
+ {
+ template<typename... _Lock>
+ static void
+ __do_unlock(tuple<_Lock&...>&)
+ { }
+ };
+
+ template<int _Idx, bool _Continue = true>
+ struct __try_lock_impl
+ {
+ template<typename... _Lock>
+ static int
+ __do_try_lock(tuple<_Lock&...>& __locks)
+ {
+ if(std::get<_Idx>(__locks).try_lock())
+ {
+ return __try_lock_impl<_Idx + 1,
+ _Idx + 2 < sizeof...(_Lock)>::__do_try_lock(__locks);
+ }
+ else
+ {
+ __unlock_impl<_Idx>::__do_unlock(__locks);
+ return _Idx;
+ }
+ }
+ };
+
+ template<int _Idx>
+ struct __try_lock_impl<_Idx, false>
+ {
+ template<typename... _Lock>
+ static int
+ __do_try_lock(tuple<_Lock&...>& __locks)
+ {
+ if(std::get<_Idx>(__locks).try_lock())
+ return -1;
+ else
+ {
+ __unlock_impl<_Idx>::__do_unlock(__locks);
+ return _Idx;
+ }
+ }
+ };
+
+ /** @brief Generic try_lock.
+ * @param __l1 Meets Mutex requirements (try_lock() may throw).
+ * @param __l2 Meets Mutex requirements (try_lock() may throw).
+ * @param __l3 Meets Mutex requirements (try_lock() may throw).
+ * @return Returns -1 if all try_lock() calls return true. Otherwise returns
+ * a 0-based index corresponding to the argument that returned false.
+ * @post Either all arguments are locked, or none will be.
+ *
+ * Sequentially calls try_lock() on each argument.
+ */
+ template<typename _Lock1, typename _Lock2, typename... _Lock3>
int
- try_lock(_L1& __l1, _L2& __l2, _L3&... __l3);
+ try_lock(_Lock1& __l1, _Lock2& __l2, _Lock3&... __l3)
+ {
+ tuple<_Lock1&, _Lock2&, _Lock3&...> __locks(__l1, __l2, __l3...);
+ return __try_lock_impl<0>::__do_try_lock(__locks);
+ }
+ /// lock
template<typename _L1, typename _L2, typename ..._L3>
void
lock(_L1&, _L2&, _L3&...);
/// once_flag
struct once_flag
{
+ private:
typedef __gthread_once_t __native_type;
+ __native_type _M_once;
+ public:
once_flag()
{
- __gthread_once_t __tmp = __GTHREAD_ONCE_INIT;
+ __native_type __tmp = __GTHREAD_ONCE_INIT;
_M_once = __tmp;
}
-
+
once_flag(const once_flag&) = delete;
once_flag& operator=(const once_flag&) = delete;
template<typename _Callable, typename... _Args>
friend void
call_once(once_flag& __once, _Callable __f, _Args&&... __args);
-
- private:
- __native_type _M_once;
};
#ifdef _GLIBCXX_HAVE_TLS
extern __thread void (*__once_call)();
template<typename _Callable>
- void __once_call_impl()
+ inline void
+ __once_call_impl()
{
(*(_Callable*)__once_callable)();
}
#else
extern function<void()> __once_functor;
- extern unique_lock<mutex> __once_functor_lock;
+
+ extern unique_lock<mutex>&
+ __get_once_functor_lock();
#endif
extern "C" void __once_proxy();
+ /// call_once
template<typename _Callable, typename... _Args>
void
call_once(once_flag& __once, _Callable __f, _Args&&... __args)
__once_callable = &__bound_functor;
__once_call = &__once_call_impl<decltype(__bound_functor)>;
#else
- __once_functor_lock.lock();
+ unique_lock<mutex>& __functor_lock = __get_once_functor_lock();
+ __functor_lock.lock();
__once_functor = bind(__f, __args...);
#endif
-
+
int __e = __gthread_once(&(__once._M_once), &__once_proxy);
-#ifndef _GLIBCXX_HAVE_TLS
- if (__once_functor_lock)
- __once_functor_lock.unlock();
+#ifndef _GLIBCXX_HAVE_TLS
+ if (__functor_lock)
+ __functor_lock.unlock();
#endif
if (__e)
__throw_system_error(__e);
}
+
+ // @} group mutexes
}
#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
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