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00063 #if defined(__APPLE__)
00064 # include <libkern/OSAtomic.h>
00065
00066
00067
00068 # define PaUtil_FullMemoryBarrier() OSMemoryBarrier()
00069 # define PaUtil_ReadMemoryBarrier() OSMemoryBarrier()
00070 # define PaUtil_WriteMemoryBarrier() OSMemoryBarrier()
00071 #elif defined(__GNUC__)
00072
00073 # if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
00074 # define PaUtil_FullMemoryBarrier() __sync_synchronize()
00075 # define PaUtil_ReadMemoryBarrier() __sync_synchronize()
00076 # define PaUtil_WriteMemoryBarrier() __sync_synchronize()
00077
00078
00079
00080
00081 # elif defined( __ppc__ ) || defined( __powerpc__) || defined( __PPC__ )
00082 # define PaUtil_FullMemoryBarrier() asm volatile("sync":::"memory")
00083 # define PaUtil_ReadMemoryBarrier() asm volatile("sync":::"memory")
00084 # define PaUtil_WriteMemoryBarrier() asm volatile("sync":::"memory")
00085 # elif defined( __i386__ ) || defined( __i486__ ) || defined( __i586__ ) || \
00086 defined( __i686__ ) || defined( __x86_64__ )
00087 # define PaUtil_FullMemoryBarrier() asm volatile("mfence":::"memory")
00088 # define PaUtil_ReadMemoryBarrier() asm volatile("lfence":::"memory")
00089 # define PaUtil_WriteMemoryBarrier() asm volatile("sfence":::"memory")
00090 # else
00091 # ifdef ALLOW_SMP_DANGERS
00092 # warning Memory barriers not defined on this system or system unknown
00093 # warning For SMP safety, you should fix this.
00094 # define PaUtil_FullMemoryBarrier()
00095 # define PaUtil_ReadMemoryBarrier()
00096 # define PaUtil_WriteMemoryBarrier()
00097 # else
00098 # error Memory barriers are not defined on this system. You can still compile by defining ALLOW_SMP_DANGERS, but SMP safety will not be guaranteed.
00099 # endif
00100 # endif
00101 #elif (_MSC_VER >= 1400)
00102 # include <intrin.h>
00103 # pragma intrinsic(_ReadWriteBarrier)
00104 # pragma intrinsic(_ReadBarrier)
00105 # pragma intrinsic(_WriteBarrier)
00106 # define PaUtil_FullMemoryBarrier() _ReadWriteBarrier()
00107 # define PaUtil_ReadMemoryBarrier() _ReadBarrier()
00108 # define PaUtil_WriteMemoryBarrier() _WriteBarrier()
00109 #elif defined(_MSC_VER) || defined(__BORLANDC__)
00110 # define PaUtil_FullMemoryBarrier() _asm { lock add [esp], 0 }
00111 # define PaUtil_ReadMemoryBarrier() _asm { lock add [esp], 0 }
00112 # define PaUtil_WriteMemoryBarrier() _asm { lock add [esp], 0 }
00113 #else
00114 # ifdef ALLOW_SMP_DANGERS
00115 # warning Memory barriers not defined on this system or system unknown
00116 # warning For SMP safety, you should fix this.
00117 # define PaUtil_FullMemoryBarrier()
00118 # define PaUtil_ReadMemoryBarrier()
00119 # define PaUtil_WriteMemoryBarrier()
00120 # else
00121 # error Memory barriers are not defined on this system. You can still compile by defining ALLOW_SMP_DANGERS, but SMP safety will not be guaranteed.
00122 # endif
00123 #endif