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csutil/threading/atomicops_gcc_x86.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_GCC_X86_H__
00020 #define __CS_CSUTIL_ATOMICOPS_GCC_X86_H__
00021 
00022 #ifndef DOXYGEN_RUN
00023 
00024 namespace CS
00025 {
00026 namespace Threading
00027 {
00028   class AtomicOperationsX86GCC
00029   {
00030   public:
00031     inline static int32 Set (int32* target, int32 value)
00032     {
00033       __asm__ __volatile__
00034       (
00035       "xchgl %0, %1"
00036       : "=r" (value)
00037       : "m" (*target), "0" (value)
00038       : "memory"
00039       );
00040       return value;
00041     }
00042 
00043     inline static void* Set (void** target, void* value)
00044     {
00045 #if CS_PROCESSOR_SIZE == 32
00046       return (void*)Set ((int32*)target, (int32)value);
00047 #elif CS_PROCESSOR_SIZE == 64
00048       __asm__ __volatile__
00049       (
00050       "xchgq %0, %1"
00051       : "=r" (value)
00052       : "m" (*target), "0" (value)
00053       : "memory"
00054       );
00055       return value;
00056 #endif
00057     }
00058 
00059     inline static int32 CompareAndSet (int32* target, int32 value,
00060       int32 comparand)
00061     {
00062       int32 prev;
00063       __asm__ __volatile__
00064       (
00065       "lock; cmpxchgl %1, %2"
00066       : "=a" (prev)
00067       : "r" (value), "m" (*target), "0" (comparand)
00068       : "memory"
00069       );
00070       return prev;
00071     }
00072 
00073     inline static void* CompareAndSet (void** target, void* value,
00074       void* comparand)
00075     {
00076 #if CS_PROCESSOR_SIZE == 32
00077       return (void*)CompareAndSet ((int32*)target, (int32)value, 
00078         (int32)comparand);
00079 #elif CS_PROCESSOR_SIZE == 64
00080       void* prev;
00081       __asm__ __volatile__
00082       (
00083       "lock; cmpxchgq %1, %2"
00084       : "=a" (prev)
00085       : "r" (value), "m" (*target), "0" (comparand)
00086       : "memory"
00087       );
00088       return prev;
00089 #endif
00090     }
00091 
00092     inline static int32 Increment (int32* target, int32 incr = 1)
00093     {
00094       int32 result;
00095       __asm__ __volatile__
00096       (
00097       "lock; xaddl %0, %1"
00098       : "=r" (result), "=m" (*target)
00099       : "0" (incr), "m" (*target)
00100       : "memory"
00101       );
00102       return result + incr;
00103     }
00104 
00105     inline static int32 Decrement (int32* target)
00106     {
00107       return (int32)Increment (target, -1);
00108     }
00109   };
00110 
00111 }
00112 }
00113 
00114 #endif // DOXYGEN_RUN
00115 
00116 #endif // __CS_CSUTIL_ATOMICOPS_GCC_X86_H__

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