//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
// Author: Mike Brasher, Inova Europe (mike-brasher@austin.rr.com)
//
//%/////////////////////////////////////////////////////////////////////////////

#ifndef Pegasus_SpinLock_SOLARIS_SPARC_GNU_h
#define Pegasus_SpinLock_SOLARIS_SPARC_GNU_h

#include <new>
#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/Mutex.h>

#define PEGASUS_SPINLOCK_USE_PTHREADS

PEGASUS_NAMESPACE_BEGIN

// This type implements a spinlock. It is deliberately not a class since we 
// wish to avoid automatic construction/destruction.
struct SpinLock
{
    volatile unsigned char lock;
};

inline void SpinLockCreate(SpinLock& x)
{
    x.lock = 0;
}

inline void SpinLockDestroy(SpinLock& x)
{
}

inline void SpinLockLock(SpinLock& x)
{
    Uint32 value;

    // Loop until lock becomes zero.
    do
    {
	// Load and store unsigned byte (LDSTUB). Load the lock argument
	// into value and set lock to 0xFF (atomically).
	asm("ldstub %1, %0"
	    : "=r" (value),
	      "=m" (x.lock)
	    : "m" (x.lock));
    }
    while (value);
}

inline void SpinLockUnlock(SpinLock& x)
{
    x.lock = 0;
}

PEGASUS_NAMESPACE_END

#endif /* Pegasus_SpinLock_SOLARIS_SPARC_GNU_h */