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// -*- c++ -*-
/* Copyright (C) 2002 The gtkmm Development Team
*
* 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) 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
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <glibmmconfig.h>
#include <glibmm/threadpool.h>
#include <glibmm/exceptionhandler.h>
#include <glibmm/threads.h>
#include <glib.h>
#include <list>
namespace Glib
{
// internal
class ThreadPool::SlotList
{
public:
SlotList();
~SlotList();
// noncopyable
SlotList(const ThreadPool::SlotList&) = delete;
ThreadPool::SlotList& operator=(const ThreadPool::SlotList&) = delete;
sigc::slot<void>* push(const sigc::slot<void>& slot);
sigc::slot<void> pop(sigc::slot<void>* slot_ptr);
void lock_and_unlock();
private:
Glib::Threads::Mutex mutex_;
std::list< sigc::slot<void> > list_;
};
ThreadPool::SlotList::SlotList()
{}
ThreadPool::SlotList::~SlotList()
{}
sigc::slot<void>* ThreadPool::SlotList::push(const sigc::slot<void>& slot)
{
Threads::Mutex::Lock lock (mutex_);
list_.push_back(slot);
return &list_.back();
}
sigc::slot<void> ThreadPool::SlotList::pop(sigc::slot<void>* slot_ptr)
{
sigc::slot<void> slot;
{
Threads::Mutex::Lock lock (mutex_);
std::list< sigc::slot<void> >::iterator pslot = list_.begin();
while(pslot != list_.end() && slot_ptr != &*pslot)
++pslot;
if(pslot != list_.end())
{
slot = *pslot;
list_.erase(pslot);
}
}
return slot;
}
void ThreadPool::SlotList::lock_and_unlock()
{
mutex_.lock();
mutex_.unlock();
}
} // namespace Glib
namespace
{
static void call_thread_entry_slot(void* data, void* user_data)
{
try
{
Glib::ThreadPool::SlotList *const slot_list =
static_cast<Glib::ThreadPool::SlotList*>(user_data);
sigc::slot<void> slot (slot_list->pop(static_cast<sigc::slot<void>*>(data)));
slot();
}
catch(Glib::Threads::Thread::Exit&)
{
// Just exit from the thread. The Thread::Exit exception
// is our sane C++ replacement of g_thread_exit().
}
catch(...)
{
Glib::exception_handlers_invoke();
}
}
} // anonymous namespace
namespace Glib
{
ThreadPool::ThreadPool(int max_threads, bool exclusive)
:
gobject_ (0),
slot_list_ (new SlotList())
{
GError* error = nullptr;
gobject_ = g_thread_pool_new(
&call_thread_entry_slot, slot_list_, max_threads, exclusive, &error);
if(error)
{
delete slot_list_;
slot_list_ = nullptr;
Glib::Error::throw_exception(error);
}
}
ThreadPool::~ThreadPool()
{
if(gobject_)
g_thread_pool_free(gobject_, 1, 1);
if(slot_list_)
{
slot_list_->lock_and_unlock();
delete slot_list_;
}
}
void ThreadPool::push(const sigc::slot<void>& slot)
{
sigc::slot<void> *const slot_ptr = slot_list_->push(slot);
GError* error = nullptr;
g_thread_pool_push(gobject_, slot_ptr, &error);
if(error)
{
slot_list_->pop(slot_ptr);
Glib::Error::throw_exception(error);
}
}
void ThreadPool::set_max_threads(int max_threads)
{
GError* error = nullptr;
g_thread_pool_set_max_threads(gobject_, max_threads, &error);
if(error)
Glib::Error::throw_exception(error);
}
int ThreadPool::get_max_threads() const
{
return g_thread_pool_get_max_threads(gobject_);
}
unsigned int ThreadPool::get_num_threads() const
{
return g_thread_pool_get_num_threads(gobject_);
}
unsigned int ThreadPool::unprocessed() const
{
return g_thread_pool_unprocessed(gobject_);
}
bool ThreadPool::get_exclusive() const
{
g_return_val_if_fail(gobject_ != nullptr, false);
return gobject_->exclusive;
}
void ThreadPool::shutdown(bool immediately)
{
if(gobject_)
{
g_thread_pool_free(gobject_, immediately, 1);
gobject_ = nullptr;
}
if(slot_list_)
{
slot_list_->lock_and_unlock();
delete slot_list_;
slot_list_ = nullptr;
}
}
// static
void ThreadPool::set_max_unused_threads(int max_threads)
{
g_thread_pool_set_max_unused_threads(max_threads);
}
// static
int ThreadPool::get_max_unused_threads()
{
return g_thread_pool_get_max_unused_threads();
}
// static
unsigned int ThreadPool::get_num_unused_threads()
{
return g_thread_pool_get_num_unused_threads();
}
// static
void ThreadPool::stop_unused_threads()
{
g_thread_pool_stop_unused_threads();
}
} // namespace Glib
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