Robin Gareus
fe85575a12
For some backends the process thread can change (e.g. switch coreaudio headphone + internal speakers) If there are existing x-thread event calls this can lead to the following situation: 1) SessionEvent::operator new 2) audioengine process thread change 3) SessionEvent::operator delete -> crash, wrong thread SessionEvent::operator delete can safely push the event back to the pool for later cleanup..
146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/*
|
|
Copyright (C) 1998-99 Paul Barton-Davis
|
|
|
|
This program 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
#ifndef __qm_pool_h__
|
|
#define __qm_pool_h__
|
|
|
|
#include <vector>
|
|
#include <string>
|
|
|
|
#include <glibmm/threads.h>
|
|
|
|
#include "pbd/libpbd_visibility.h"
|
|
#include "pbd/ringbuffer.h"
|
|
|
|
/** A pool of data items that can be allocated, read from and written to
|
|
* without system memory allocation or locking.
|
|
*/
|
|
class LIBPBD_API Pool
|
|
{
|
|
public:
|
|
Pool (std::string name, unsigned long item_size, unsigned long nitems);
|
|
virtual ~Pool ();
|
|
|
|
virtual void *alloc ();
|
|
virtual void release (void *);
|
|
|
|
std::string name() const { return _name; }
|
|
guint available() const { return free_list.read_space(); }
|
|
guint used() const { return free_list.bufsize() - available(); }
|
|
guint total() const { return free_list.bufsize(); }
|
|
|
|
protected:
|
|
RingBuffer<void*> free_list; ///< a list of pointers to free items within block
|
|
std::string _name;
|
|
|
|
private:
|
|
void *block; ///< data storage area
|
|
};
|
|
|
|
class LIBPBD_API SingleAllocMultiReleasePool : public Pool
|
|
{
|
|
public:
|
|
SingleAllocMultiReleasePool (std::string name, unsigned long item_size, unsigned long nitems);
|
|
~SingleAllocMultiReleasePool ();
|
|
|
|
virtual void *alloc ();
|
|
virtual void release (void *);
|
|
|
|
private:
|
|
Glib::Threads::Mutex m_lock;
|
|
};
|
|
|
|
|
|
class LIBPBD_API MultiAllocSingleReleasePool : public Pool
|
|
{
|
|
public:
|
|
MultiAllocSingleReleasePool (std::string name, unsigned long item_size, unsigned long nitems);
|
|
~MultiAllocSingleReleasePool ();
|
|
|
|
virtual void *alloc ();
|
|
virtual void release (void *);
|
|
|
|
private:
|
|
Glib::Threads::Mutex m_lock;
|
|
};
|
|
|
|
class LIBPBD_API PerThreadPool;
|
|
|
|
/** Management of a per-thread pool of data that is allocated by one thread and
|
|
* freed by one other thread. Not safe for use when there is more than 1
|
|
* reader and 1 writer.
|
|
*
|
|
* This is basically a wrapper around a thread-local storage instance of a
|
|
* ringbuffer, made safe for use in the case where multiple threads allocate
|
|
* from the ringbuffer and a single thread "frees" the allocations.
|
|
*
|
|
* Rather than using locks, each thread has its own ringbuffer (and associated
|
|
* data), and so it calls alloc(), passes a pointer to the result of the alloc
|
|
* to another thread, which later calls push() to "free" it.
|
|
*/
|
|
class LIBPBD_API CrossThreadPool : public Pool
|
|
{
|
|
public:
|
|
CrossThreadPool (std::string n, unsigned long isize, unsigned long nitems, PerThreadPool *);
|
|
|
|
void* alloc ();
|
|
void push (void *);
|
|
|
|
PerThreadPool* parent () const {
|
|
return _parent;
|
|
}
|
|
|
|
bool empty ();
|
|
guint pending_size() const { return pending.read_space(); }
|
|
|
|
void flush_pending ();
|
|
void flush_pending_with_ev (void*);
|
|
|
|
private:
|
|
RingBuffer<void*> pending;
|
|
PerThreadPool* _parent;
|
|
};
|
|
|
|
/** A class to manage per-thread pools of memory. One object of this class is instantiated,
|
|
* and then it is used to create per-thread pools for 1 or more threads as required.
|
|
*/
|
|
class LIBPBD_API PerThreadPool
|
|
{
|
|
public:
|
|
PerThreadPool ();
|
|
|
|
const Glib::Threads::Private<CrossThreadPool>& key() const { return _key; }
|
|
|
|
void create_per_thread_pool (std::string name, unsigned long item_size, unsigned long nitems);
|
|
CrossThreadPool* per_thread_pool (bool must_exist = true);
|
|
|
|
void set_trash (RingBuffer<CrossThreadPool*>* t);
|
|
void add_to_trash (CrossThreadPool *);
|
|
|
|
private:
|
|
Glib::Threads::Private<CrossThreadPool> _key;
|
|
std::string _name;
|
|
|
|
/** mutex to protect either changes to the _trash variable, or writes to the RingBuffer */
|
|
Glib::Threads::Mutex _trash_mutex;
|
|
RingBuffer<CrossThreadPool*>* _trash;
|
|
};
|
|
|
|
#endif // __qm_pool_h__
|