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Public API Reference

csutil/threading/atomicops_sparc.h

00001 /*
00002   Copyright (C) 2006 by Marten Svanfeldt
00003 
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Lesser General Public
00006   License as published by the Free Software Foundation; either
00007   version 2 of the License, or (at your option) any later version.
00008 
00009   This library is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012   Library General Public License for more details.
00013 
00014   You should have received a copy of the GNU Library General Public
00015   License along with this library; if not, write to the Free
00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_CSUTIL_ATOMICOPS_SPARC_H__
00020 #define __CS_CSUTIL_ATOMICOPS_SPARC_H__
00021 
00022 #ifndef DOXYGEN_RUN
00023 
00024 namespace CS
00025 {
00026 namespace Threading
00027 {
00028   class AtomicOperationsSparc
00029   {
00030   public:
00031     inline static int32 Set (int32* target, int32 value)
00032     {
00033       *const_cast<volatile int32*> (target) = value;
00034       __asm__ __volatile__
00035         (
00036         "membar #StoreStore | #StoreLoad"
00037         : : : "memory"
00038         );
00039       return value;
00040     }
00041 
00042     inline static void* Set (void** target, void* value)
00043     {
00044       return (void*)Set ((int32*)target, (int32)value);
00045     }
00046 
00047     inline static int32 CompareAndSet (int32* target, int32 value,
00048       int32 comparand)
00049     {
00050       int32 prev;
00051 
00052       __asm__ __volatile__ 
00053         (
00054         "cas [%1],%2,%0"
00055         : "+r" (value)
00056         : "r" (target), "r" (comparand)
00057         );
00058 
00059       return prev;
00060     }
00061 
00062     inline static void* CompareAndSet (void** target, void* value,
00063       void* comparand)
00064     {
00065       return (void*)CompareAndSet ((int32*)target, (int32)value, 
00066         (int32)comparand);
00067     }
00068 
00069     inline static int32 Increment (int32* target, int32 incr = 1)
00070     {
00071       //@@Potentially dangerous code, needs to be revisited
00072       int32 prevValue, currValue, nextValue;
00073       do 
00074       {
00075         __asm__ __volatile__
00076           (
00077           "membar #StoreLoad | #LoadLoad"
00078           : : : "memory"
00079           );
00080 
00081         currValue = *target;
00082         nextValue = currValue + incr;
00083         prevValue = CompareAndSet (target, nextValue, currValue);
00084       } while(prevValue == currValue);
00085       return nextValue;
00086     }
00087 
00088     inline static int32 Decrement (int32* target)
00089     {
00090       return (int32)Increment (target, -1);
00091     }
00092   };
00093 }
00094 }
00095 
00096 #endif // DOXYGEN_RUN
00097 
00098 #endif // __CS_CSUTIL_ATOMICOPS_SPARC_H__

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