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BUG#: 5314
TITLE: IPC Refactoring

DESCRIPTION: This patch cleans up the IPC related classes. It (1) reorganizes
related classes into their own headers, (2) makes the mutex class recursive to
eliminate recursive lock exclusion logic, (3) reimplements condition variables,
renames dozens of global functions.

//%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 */