blocxx

MemoryBarrier.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Quest Software, Inc. All rights reserved.
00003 * Copyright (C) 2006, Novell, Inc. All rights reserved.
00004 * 
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 * 
00008 *     * Redistributions of source code must retain the above copyright notice,
00009 *       this list of conditions and the following disclaimer.
00010 *     * Redistributions in binary form must reproduce the above copyright
00011 *       notice, this list of conditions and the following disclaimer in the
00012 *       documentation and/or other materials provided with the distribution.
00013 *     * Neither the name of 
00014 *       Quest Software, Inc., 
00015 *       nor Novell, Inc., 
00016 *       nor the names of its contributors or employees may be used to 
00017 *       endorse or promote products derived from this software without 
00018 *       specific prior written permission.
00019 * 
00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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00032 
00033 
00038 #ifndef BLOCXX_MEMORY_BARRIER_HPP_INCLUDE_GUARD_
00039 #define BLOCXX_MEMORY_BARRIER_HPP_INCLUDE_GUARD_
00040 #include "blocxx/BLOCXX_config.h"
00041 
00042 // The classes and functions defined in this file are not meant for general
00043 // use, they are internal implementation details.  They may change at any time.
00044 
00045 namespace BLOCXX_NAMESPACE
00046 {
00047 
00052 inline void readWriteMemoryBarrier()
00053 {
00054    #if defined(__alpha)
00055    // DEC/COMPAQ/HP Alpha
00056    __asm__ __volatile__("mb");
00057 
00058    #elif defined(__HP_aCC) && defined(BLOCXX_ARCH_IA64)
00059    // Itanium (useable with aCC as the compiler).
00060    _Asm_mf();
00061    #elif defined(BLOCXX_ARCH_IA64)
00062    // Intel Itanium
00063    __asm__ __volatile__("mf");
00064 
00065    #elif defined(BLOCXX_ARCH_PPC) || defined(BLOCXX_ARCH_PPC64)
00066    // PPC/PPC64
00067    __asm__ __volatile__ ("sync" : : : "memory");
00068 
00069    #elif defined(BLOCXX_ARCH_S390) || defined(BLOCXX_ARCH_S390X)
00070    // s390/s390x
00071    __asm__ __volatile__ ( "bcr 15,0" : : : "memory" ); 
00072 
00073    #elif defined(BLOCXX_ARCH_X86_64) || defined(BLOCXX_ARCH_X86) || defined(BLOCXX_ARCH_HPPA20) || defined(BLOCXX_ARCH_SPARC)
00074    // Nothing required for these architectures.
00075    #else // if defined(BLOCXX_ARCH_UNKNOWN)
00076    #error "Unknown architecture. readWriteMemoryBarrier() must be updated"
00077    #endif
00078 }
00079 
00080 } // end namespace BLOCXX_NAMESPACE
00081 
00082 
00083 #endif
00084 
00085