// <mutex> -*- C++ -*-
-// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
-/** @file mutex
+/** @file include/mutex
* This is a Standard C++ Library header.
*/
#pragma GCC system_header
#ifndef __GXX_EXPERIMENTAL_CXX0X__
-# include <c++0x_warning.h>
+# include <bits/c++0x_warning.h>
#else
#include <tuple>
-#include <cstddef>
#include <chrono>
#include <exception>
#include <type_traits>
#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
-namespace std
-{
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
/**
* @defgroup mutexes Mutexes
* @ingroup concurrency
public:
typedef __native_type* native_handle_type;
+#ifdef __GTHREAD_MUTEX_INIT
+ constexpr mutex() : _M_mutex(__GTHREAD_MUTEX_INIT) { }
+#else
mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
-#ifdef __GTHREAD_MUTEX_INIT
- __native_type __tmp = __GTHREAD_MUTEX_INIT;
- _M_mutex = __tmp;
-#else
__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
-#endif
}
+ ~mutex() { __gthread_mutex_destroy(&_M_mutex); }
+#endif
+
mutex(const mutex&) = delete;
mutex& operator=(const mutex&) = delete;
{ return &_M_mutex; }
};
+#ifndef __GTHREAD_RECURSIVE_MUTEX_INIT
+ // FIXME: gthreads doesn't define __gthread_recursive_mutex_destroy
+ // so we need to obtain a __gthread_mutex_t to destroy
+ class __destroy_recursive_mutex
+ {
+ template<typename _Mx, typename _Rm>
+ static void
+ _S_destroy_win32(_Mx* __mx, _Rm const* __rmx)
+ {
+ __mx->counter = __rmx->counter;
+ __mx->sema = __rmx->sema;
+ __gthread_mutex_destroy(__mx);
+ }
+
+ public:
+ // matches a gthr-win32.h recursive mutex
+ template<typename _Rm>
+ static typename enable_if<sizeof(&_Rm::sema), void>::type
+ _S_destroy(_Rm* __mx)
+ {
+ __gthread_mutex_t __tmp;
+ _S_destroy_win32(&__tmp, __mx);
+ }
+
+ // matches a recursive mutex with a member 'actual'
+ template<typename _Rm>
+ static typename enable_if<sizeof(&_Rm::actual), void>::type
+ _S_destroy(_Rm* __mx)
+ { __gthread_mutex_destroy(&__mx->actual); }
+
+ // matches when there's only one mutex type
+ template<typename _Rm>
+ static
+ typename enable_if<is_same<_Rm, __gthread_mutex_t>::value, void>::type
+ _S_destroy(_Rm* __mx)
+ { __gthread_mutex_destroy(__mx); }
+ };
+#endif
+
/// recursive_mutex
class recursive_mutex
{
public:
typedef __native_type* native_handle_type;
+#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
+ recursive_mutex() : _M_mutex(__GTHREAD_RECURSIVE_MUTEX_INIT) { }
+#else
recursive_mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
-#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
- __native_type __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
- _M_mutex = __tmp;
-#else
__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
-#endif
}
+ ~recursive_mutex()
+ { __destroy_recursive_mutex::_S_destroy(&_M_mutex); }
+#endif
+
recursive_mutex(const recursive_mutex&) = delete;
recursive_mutex& operator=(const recursive_mutex&) = delete;
public:
typedef __native_type* native_handle_type;
- timed_mutex()
- {
#ifdef __GTHREAD_MUTEX_INIT
- __native_type __tmp = __GTHREAD_MUTEX_INIT;
- _M_mutex = __tmp;
+ timed_mutex() : _M_mutex(__GTHREAD_MUTEX_INIT) { }
#else
+ timed_mutex()
+ {
__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mutex);
-#endif
}
+ ~timed_mutex() { __gthread_mutex_destroy(&_M_mutex); }
+#endif
+
timed_mutex(const timed_mutex&) = delete;
timed_mutex& operator=(const timed_mutex&) = delete;
public:
typedef __native_type* native_handle_type;
+#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
+ recursive_timed_mutex() : _M_mutex(__GTHREAD_RECURSIVE_MUTEX_INIT) { }
+#else
recursive_timed_mutex()
{
// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
-#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
- __native_type __tmp = __GTHREAD_RECURSIVE_MUTEX_INIT;
- _M_mutex = __tmp;
-#else
__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
-#endif
}
+ ~recursive_timed_mutex()
+ { __destroy_recursive_mutex::_S_destroy(&_M_mutex); }
+#endif
+
recursive_timed_mutex(const recursive_timed_mutex&) = delete;
recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;
/// and manage it.
struct adopt_lock_t { };
- extern const defer_lock_t defer_lock;
- extern const try_to_lock_t try_to_lock;
- extern const adopt_lock_t adopt_lock;
-
- /**
- * @brief Thrown to indicate errors with lock operations.
- *
- * @ingroup exceptions
- */
- class lock_error : public exception
- {
- public:
- virtual const char*
- _GLIBCXX_CONST what() const throw();
- };
+ constexpr defer_lock_t defer_lock { };
+ constexpr try_to_lock_t try_to_lock { };
+ constexpr adopt_lock_t adopt_lock { };
/// @brief Scoped lock idiom.
// Acquire the mutex here with a constructor call, then release with
explicit lock_guard(mutex_type& __m) : _M_device(__m)
{ _M_device.lock(); }
- lock_guard(mutex_type& __m, adopt_lock_t __a) : _M_device(__m)
- { _M_device.lock(); }
+ lock_guard(mutex_type& __m, adopt_lock_t) : _M_device(__m)
+ { } // calling thread owns mutex
~lock_guard()
{ _M_device.unlock(); }
}
void
- swap(unique_lock&& __u)
+ swap(unique_lock& __u)
{
std::swap(_M_device, __u._M_device);
std::swap(_M_owns, __u._M_owns);
owns_lock() const
{ return _M_owns; }
- /* explicit */ operator bool () const
+ explicit operator bool() const
{ return owns_lock(); }
mutex_type*
swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y)
{ __x.swap(__y); }
- template<typename _Mutex>
- inline void
- swap(unique_lock<_Mutex>&& __x, unique_lock<_Mutex>& __y)
- { __x.swap(__y); }
-
- template<typename _Mutex>
- inline void
- swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>&& __y)
- { __x.swap(__y); }
-
template<int _Idx>
struct __unlock_impl
{
{ }
};
+ template<typename _Lock>
+ unique_lock<_Lock>
+ __try_to_lock(_Lock& __l)
+ { return unique_lock<_Lock>(__l, try_to_lock); }
+
template<int _Idx, bool _Continue = true>
struct __try_lock_impl
{
template<typename... _Lock>
- static int
- __do_try_lock(tuple<_Lock&...>& __locks)
+ static void
+ __do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
{
- 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;
- }
+ __idx = _Idx;
+ auto __lock = __try_to_lock(std::get<_Idx>(__locks));
+ if (__lock.owns_lock())
+ {
+ __try_lock_impl<_Idx + 1, _Idx + 2 < sizeof...(_Lock)>::
+ __do_try_lock(__locks, __idx);
+ if (__idx == -1)
+ __lock.release();
+ }
}
};
struct __try_lock_impl<_Idx, false>
{
template<typename... _Lock>
- static int
- __do_try_lock(tuple<_Lock&...>& __locks)
+ static void
+ __do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
{
- if(std::get<_Idx>(__locks).try_lock())
- return -1;
- else
- {
- __unlock_impl<_Idx>::__do_unlock(__locks);
- return _Idx;
- }
+ __idx = _Idx;
+ auto __lock = __try_to_lock(std::get<_Idx>(__locks));
+ if (__lock.owns_lock())
+ {
+ __idx = -1;
+ __lock.release();
+ }
}
};
int
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);
+ int __idx;
+ auto __locks = std::tie(__l1, __l2, __l3...);
+ __try
+ { __try_lock_impl<0>::__do_try_lock(__locks, __idx); }
+ __catch(...)
+ { }
+ return __idx;
}
- /// lock
+ /** @brief Generic 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).
+ * @throw An exception thrown by an argument's lock() or try_lock() member.
+ * @post All arguments are locked.
+ *
+ * All arguments are locked via a sequence of calls to lock(), try_lock()
+ * and unlock(). If the call exits via an exception any locks that were
+ * obtained will be released.
+ */
template<typename _L1, typename _L2, typename ..._L3>
void
- lock(_L1&, _L2&, _L3&...);
+ lock(_L1& __l1, _L2& __l2, _L3&... __l3)
+ {
+ while (true)
+ {
+ unique_lock<_L1> __first(__l1);
+ int __idx;
+ auto __locks = std::tie(__l2, __l3...);
+ __try_lock_impl<0, sizeof...(_L3)>::__do_try_lock(__locks, __idx);
+ if (__idx == -1)
+ {
+ __first.release();
+ return;
+ }
+ }
+ }
/// once_flag
struct once_flag
__native_type _M_once;
public:
- once_flag()
- {
- __native_type __tmp = __GTHREAD_ONCE_INIT;
- _M_once = __tmp;
- }
+ constexpr once_flag() : _M_once(__GTHREAD_ONCE_INIT) { }
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);
+ call_once(once_flag& __once, _Callable&& __f, _Args&&... __args);
};
#ifdef _GLIBCXX_HAVE_TLS
}
#else
extern function<void()> __once_functor;
- extern unique_lock<mutex>* __once_functor_lock;
+
+ extern void
+ __set_once_functor_lock_ptr(unique_lock<mutex>*);
extern mutex&
__get_once_mutex();
/// call_once
template<typename _Callable, typename... _Args>
void
- call_once(once_flag& __once, _Callable __f, _Args&&... __args)
+ call_once(once_flag& __once, _Callable&& __f, _Args&&... __args)
{
#ifdef _GLIBCXX_HAVE_TLS
- auto __bound_functor = bind(__f, __args...);
+ auto __bound_functor = std::bind<void>(std::forward<_Callable>(__f),
+ std::forward<_Args>(__args)...);
__once_callable = &__bound_functor;
__once_call = &__once_call_impl<decltype(__bound_functor)>;
#else
unique_lock<mutex> __functor_lock(__get_once_mutex());
- __once_functor = bind(__f, __args...);
- __once_functor_lock = &__functor_lock;
+ __once_functor = std::bind<void>(std::forward<_Callable>(__f),
+ std::forward<_Args>(__args)...);
+ __set_once_functor_lock_ptr(&__functor_lock);
#endif
int __e = __gthread_once(&(__once._M_once), &__once_proxy);
+#ifndef _GLIBCXX_HAVE_TLS
+ if (__functor_lock)
+ __set_once_functor_lock_ptr(0);
+#endif
+
if (__e)
__throw_system_error(__e);
}
// @} group mutexes
-}
+_GLIBCXX_END_NAMESPACE
#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
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