160 lines
3.8 KiB
C++
160 lines
3.8 KiB
C++
/*
|
|
* Copyright (C) 2013 Intel Corporation
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) version 3.
|
|
*
|
|
* 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef INCL_THREAD_SUPPORT
|
|
# define INCL_THREAD_SUPPORT
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_GLIB
|
|
# include <glib.h>
|
|
#else
|
|
# define GLIB_CHECK_VERSION(major, minor, revision) 0
|
|
#endif
|
|
|
|
#include <boost/shared_ptr.hpp>
|
|
|
|
#include <syncevo/declarations.h>
|
|
SE_BEGIN_CXX
|
|
|
|
// The revised threading API we use below was introduced in glib 2.3.2
|
|
// The fallback for older glib is to not offer thread support.
|
|
// The classes are still defined, they just don't do anything.
|
|
#if GLIB_CHECK_VERSION(2, 32, 0)
|
|
# define HAVE_THREAD_SUPPORT
|
|
|
|
/**
|
|
* Core building block for mutices.
|
|
*/
|
|
template<class M, void (*_lock)(M *), void (*_unlock)(M *)> class MutexTemplate
|
|
{
|
|
protected:
|
|
M m_mutex;
|
|
|
|
public:
|
|
/**
|
|
* Created when locking the mutex. When the last copy of it
|
|
* gets destroyed, the mutex gets unlocked again.
|
|
*/
|
|
class Guard : private boost::shared_ptr<M>
|
|
{
|
|
Guard(M *mutex) throw () :
|
|
boost::shared_ptr<M>(mutex, _unlock)
|
|
{}
|
|
friend class MutexTemplate;
|
|
|
|
public:
|
|
Guard() throw()
|
|
{}
|
|
|
|
void unlock() throw()
|
|
{
|
|
boost::shared_ptr<M>::reset();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Lock the mutex and return a handle that'll automatically
|
|
* unlock the mutex when the last copy gets destroyed.
|
|
*/
|
|
Guard lock() throw ()
|
|
{
|
|
_lock(&m_mutex);
|
|
return Guard(&m_mutex);
|
|
}
|
|
|
|
M *get() { return &m_mutex; }
|
|
operator M * () { return &m_mutex; }
|
|
};
|
|
|
|
/**
|
|
* Initializes a mutex which was allocated dynamically
|
|
* on the heap or stack and frees allocated resources
|
|
* when done. It's an error to free a locked mutex.
|
|
*/
|
|
template<class M, void (*_lock)(M *), void (*_unlock)(M *), void (*_init)(M *), void (*_clear)(M *)> class DynMutexTemplate :
|
|
public MutexTemplate<M, _lock, _unlock>
|
|
{
|
|
public:
|
|
DynMutexTemplate()
|
|
{
|
|
_init(MutexTemplate<M, _lock, _unlock>::get());
|
|
}
|
|
~DynMutexTemplate()
|
|
{
|
|
_clear(MutexTemplate<M, _lock, _unlock>::get());
|
|
}
|
|
};
|
|
|
|
typedef MutexTemplate<GMutex, g_mutex_lock, g_mutex_unlock> Mutex;
|
|
typedef DynMutexTemplate<GMutex, g_mutex_lock, g_mutex_unlock, g_mutex_init, g_mutex_clear> DynMutex;
|
|
typedef MutexTemplate<GRecMutex, g_rec_mutex_lock, g_rec_mutex_unlock> RecMutex;
|
|
typedef DynMutexTemplate<GRecMutex, g_rec_mutex_lock, g_rec_mutex_unlock, g_rec_mutex_init, g_rec_mutex_clear> DynRecMutex;
|
|
|
|
class Cond
|
|
{
|
|
GCond m_cond;
|
|
|
|
public:
|
|
Cond() { g_cond_init(&m_cond); }
|
|
~Cond() { g_cond_clear(&m_cond); }
|
|
|
|
void signal() { g_cond_signal(&m_cond); }
|
|
template<class M> void wait(M &m) { g_cond_wait(&m_cond, m); }
|
|
};
|
|
|
|
#else
|
|
|
|
# undef HAVE_THREAD_SUPPORT
|
|
|
|
/**
|
|
* Fallback just to get code compiled.
|
|
*/
|
|
class DummyMutex
|
|
{
|
|
public:
|
|
class Guard
|
|
{
|
|
public:
|
|
void unlock() throw() {}
|
|
};
|
|
|
|
Guard lock() throw() { return Guard(); }
|
|
};
|
|
|
|
typedef DummyMutex Mutex;
|
|
typedef DummyMutex DynMutex;
|
|
typedef DummyMutex RecMutex;
|
|
typedef DummyMutex RecDynMutex;
|
|
|
|
class Cond
|
|
{
|
|
public:
|
|
void signal() {}
|
|
template<class M> void wait(M &m) {}
|
|
};
|
|
|
|
#endif
|
|
|
|
SE_END_CXX
|
|
|
|
#endif // INCL_THREAD_SUPPORT
|