csutil/threading/atomicops_gcc_ppc.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_PPC_H__ 00020 #define __CS_CSUTIL_ATOMICOPS_GCC_PPC_H__ 00021 00022 #ifndef DOXYGEN_RUN 00023 00024 namespace CS 00025 { 00026 namespace Threading 00027 { 00028 class AtomicOperationsPPCGCC 00029 { 00030 public: 00031 inline static int32 Set (int32* target, int32 value) 00032 { 00033 __asm__ __volatile__ 00034 ( 00035 " lwsync \n" 00036 "1: lwarx %0,0,%2 \n" 00037 " dcbt 0,%2 \n" 00038 " stwcx. %3,0,%2 \n" 00039 " bne- 1b\n" 00040 " isync \n" 00041 : "=&r" (value), "=m" (*(unsigned int *)target) 00042 : "r" (target), "r" (value), "m" (*(unsigned int *)target) 00043 : "cc", "memory" 00044 ); 00045 return value; 00046 } 00047 00048 inline static void* Set (void** target, void* value) 00049 { 00050 return (void*)Set ((int32*)target, (int32)value); 00051 } 00052 00053 inline static int32 CompareAndSet (int32* target, int32 value, 00054 int32 comparand) 00055 { 00056 int32 prev; 00057 00058 __asm__ __volatile__ ( 00059 " lwsync \n" 00060 "1: lwarx %0,0,%2\n" 00061 " cmpw 0,%0,%3\n" 00062 " bne- 2f\n" 00063 " dcbt 0,%2 \n" 00064 " stwcx. %4,0,%2\n" 00065 " bne- 1b\n" 00066 " isync \n" 00067 "2:" 00068 : "=&r" (prev), "=m" (*target) 00069 : "r" (target), "r" (comparand), "r" (value), "m" (*target) 00070 : "cc", "memory"); 00071 return prev; 00072 } 00073 00074 inline static void* CompareAndSet (void** target, void* value, 00075 void* comparand) 00076 { 00077 return (void*)CompareAndSet ((int32*)target, (int32)value, 00078 (int32)comparand); 00079 } 00080 00081 inline static int32 Increment (int32* target, int32 incr = 1) 00082 { 00083 //@@Potentially dangerous code, needs to be revisited 00084 int32 prevValue, currValue, nextValue; 00085 do 00086 { 00087 currValue = *target; 00088 nextValue = currValue + incr; 00089 prevValue = CompareAndSet (target, nextValue, currValue); 00090 } while(prevValue == currValue); 00091 return nextValue; 00092 } 00093 00094 inline static int32 Decrement (int32* target) 00095 { 00096 return (int32)Increment (target, -1); 00097 } 00098 }; 00099 } 00100 } 00101 00102 #endif // DOXYGEN_RUN 00103 00104 #endif // __CS_CSUTIL_ATOMICOPS_GCC_PPC_H__
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