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/*
FALCON - Falcon advanced simple text evaluator.
FILE: mt.h
Multithreading abstraction layer
-------------------------------------------------------------------
Author: Giancarlo Niccolai
Begin: Tue, 08 Apr 2008 20:10:47 +0200
-------------------------------------------------------------------
(C) Copyright 2008: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
/** \file
Multithreading abstraction layer.
Mutexes, condition variables and threads. Very basic things.
*/
#ifndef FLC_WAITABLE_H
#define FLC_WAITABLE_H
#include <falcon/setup.h>
#include <falcon/types.h>
#include <falcon/basealloc.h>
#include <falcon/genericlist.h>
#include <falcon/error.h>
#include <falcon/mt.h>
#include <systhread.h>
namespace Falcon {
class Item;
namespace Ext {
/** Waiter class
This class waits for something to happen...
*/
class Waitable: public BaseAlloc
{
friend class WaitableProvider;
friend class ThreadProvider;
void *m_sysData;
protected:
Waitable():
m_refCount( 1 )
{
WaitableProvider::init( this );
}
virtual ~Waitable() { WaitableProvider::destroy( this ); }
/** Signal to the first interested thread that we may be acquired. */
void signal() { WaitableProvider::signal( this ); }
/** Signal to all the interested thread that we may be acquired. */
void broadcast() { WaitableProvider::broadcast( this ); }
/** Useful for subclasses */
mutable Mutex m_mtx;
mutable int m_refCount;
virtual bool acquireInternal()=0;
public:
virtual bool acquire() = 0;
virtual void release() = 0;
void incref();
void decref();
};
class Grant: public Waitable
{
int m_count;
protected:
virtual bool acquireInternal();
public:
Grant( int count = 1 );
virtual ~Grant();
virtual bool acquire();
virtual void release();
};
class Barrier: public Waitable
{
bool m_bOpen;
protected:
virtual bool acquireInternal();
public:
Barrier( bool bOpen = false );
virtual ~Barrier();
virtual bool acquire();
virtual void release();
void open();
void close();
};
/** Windows like events. */
class Event: public Waitable
{
bool m_bSignaled;
bool m_bAutoReset;
bool m_bHeld;
protected:
virtual bool acquireInternal();
public:
Event( bool bAutoReset = true );
virtual ~Event();
virtual bool acquire();
virtual void release();
virtual void set();
virtual void reset();
};
/** Synchronized queue. */
class SyncQueue: public Waitable
{
List m_items;
bool m_bHeld;
protected:
virtual bool acquireInternal();
public:
SyncQueue();
virtual ~SyncQueue();
virtual bool acquire();
virtual void release();
virtual void pushFront( void *data );
virtual void pushBack( void *data );
virtual bool popFront( void *&data );
virtual bool popBack( void *&data );
virtual bool empty() const;
virtual uint32 size() const;
};
/** Counter (semaphore). */
class SyncCounter: public Waitable
{
int m_count;
protected:
virtual bool acquireInternal();
public:
SyncCounter( int init = 0 );
virtual ~SyncCounter();
virtual bool acquire();
virtual void release();
void post( int count = 1 );
};
/** Thread status. */
class ThreadStatus: public Waitable
{
protected:
bool m_bTerminated;
bool m_bDetached;
bool m_bStarted;
int m_acquiredCount;
protected:
virtual bool acquireInternal();
public:
ThreadStatus();
virtual ~ThreadStatus();
virtual bool acquire();
virtual void release();
bool isTerminated() const;
bool isDetached() const;
/** Turns the status into started if not started nor detached. */
bool startable();
bool detach();
/** Turn the status in terminated, removing the started status. */
bool terminated();
};
}
}
#endif
/* end of mt.h */
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