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wefts_os_base.h

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/*
   wefts_os_base.h
   Abstract base class for os dependant implementations

   $Id: wefts_os_base.h,v 1.2 2003/08/16 13:23:58 jonnymind Exp $
---------------------------------------------
   Begin      : 2003-08-15 16:30
   Author     : Giancarlo Niccolai

   Last modified because:

*/

/**************************************************************************
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU Library General Public License as       *
*   published by the Free Software Foundation; either version 2.1 of the  *
*   License, or (at your option) any later version.                       *
***************************************************************************/


#ifndef WT_OS_BASE_H
#define WT_OS_BASE_H

#include <wefts_cleanup.h>
#include <string>

namespace Wefts {

class OSMutexBase {
protected:
   OSMutexBase(){}

public:
   virtual inline void lock()=0;

   virtual inline bool trylock()=0;

   virtual inline void unlock()=0;
};

class OSConditionBase {
protected:
   OSConditionBase() {}

public:
   virtual void signal()=0;

   virtual bool wait( OSMutexBase &mtx, CleanupItem guard )=0;

   virtual bool timedWait( OSMutexBase &mtx, long seconds,
         long nanoseconds, CleanupItem guard )=0;
};

class OSThreadBase {
protected:
   OSThreadBase() {}

   OSThreadBase( bool ) {}

protected:
   virtual void exit( void *data )=0;

public:
   virtual bool start( void *(*func)(void *), void *data )=0;

   virtual bool stop()=0;

   virtual void *join()=0;

   virtual int enableCancel()=0;

   virtual int disableCancel()=0;

   virtual bool setCancelState( int state )=0;

   virtual void testCancel()=0;
   virtual void setCancelDeferred()=0;
   virtual void detach()=0;


   virtual bool same() const=0;

   virtual bool equal( const OSThreadBase &th ) const =0;

   virtual bool setCurrent()=0;

   /* Invalidate current thread.
      This function must make so that the invalidated thread always returns
      false when same() or equal() are called. If equal() method is called
      upon another invalid thread, the result is undefined.
   */
   virtual void invalidate()=0;

   virtual bool operator==( OSThreadBase &th ) { return equal( th ); }

   virtual bool operator!=( OSThreadBase &th ) { return ! equal( th ); }
};

class OSSpecificDataBase
{
protected:
   OSSpecificDataBase() {}

public:

   virtual void *data() const =0;

   virtual void data(const void *dt) =0;
};

void OSPushCleanupAndExecute(
   void (*runner)(void *),
   void (*cleaner)(void *),
   void *data );

std::string OSErrorDescription( int osCode );

} // namespace

#endif

/* end of wefts_os_pthread.h */

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