base_thread_atomic.hh

Go to the documentation of this file.

/*
 * LEGAL:   COPYRIGHT (C) 2007 JIM E. BROOKS
 *          THIS SOURCE CODE IS RELEASED UNDER THE TERMS
 *          OF THE GNU GENERAL PUBLIC LICENSE VERSION 2 (GPL 2).
 *****************************************************************************/

#if COMPILE_THREADS
#ifndef BASE_THREAD_ATOMIC_HH
#define BASE_THREAD_ATOMIC_HH 1

#include "base_thread_common.hh"

namespace base {

class Atomic
{
;
public:

    Atomic( void ) { }
    ~Atomic() { }

    typedef volatile int Bool;
    typedef volatile int Int;
    typedef volatile long Long;

#define ATOMIC_TYPE Int
#include "base_thread_atomic2.hh"
#undef  ATOMIC_TYPE

#define ATOMIC_TYPE Long
#include "base_thread_atomic2.hh"
#undef  ATOMIC_TYPE

#if ! COMPILE_GCC_TLS
    inline CLASS_METHOD
    void
    Set( volatile pthread_t* out, volatile pthread_t val )
    {
        *out = val;
    }
#endif

};

class Busy
{
public:
    Busy( Atomic::Int* busy )
    :   mBusy(busy)
    {
        mBusy2 = Atomic::Add( mBusy, +1 );
    }

    ~Busy()
    {
        Atomic::Add( mBusy, -1 );
    }

    bool IfBusy( void ) const
    {
        ASSERT( mBusy2 >= 0 );  // should never become negative
        return mBusy2 > 1;      // > 1 since to account for first time
    }

private:
    Atomic::Int* const  mBusy;   
    Atomic::Int         mBusy2;  
};

#define BUSY_BEGIN          PERSISTENT Atomic::Int sBusy = 0;    \
                            Busy busy( &sBusy );                 \
                            if ( busy.IfBusy() ) return;

#define BUSY_BEGIN_ASSERT   PERSISTENT Atomic::Int sBusy = 0;    \
                            Busy busy ( &sBusy );                \
                            ASSERT_OR_RETURN( not busy.IfBusy() );

#define BUSY_END            /* NOP */

//------------------------------------------------------------------------------

} // namespace base

#endif // BASE_THREAD_ATOMIC_HH
#endif // COMPILE_THREADS

Palomino 3D Engine documents generated by doxygen 1.5.3 on Fri Nov 23 11:26:07 2007