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Comparing libecb/ecb.h (file contents):
Revision 1.92 by root, Tue May 29 17:17:56 2012 UTC vs.
Revision 1.95 by root, Tue May 29 21:06:01 2012 UTC

… …
92 92
93/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 93/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
94/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 94/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
95 95
96#if ECB_NO_THREADS 96#if ECB_NO_THREADS
97# define ECB_NO_SMP 1 97 #define ECB_NO_SMP 1
98#endif 98#endif
99 99
100#if ECB_NO_THREADS || ECB_NO_SMP 100#if ECB_NO_SMP
101 #define ECB_MEMORY_FENCE do { } while (0) 101 #define ECB_MEMORY_FENCE do { } while (0)
102#endif
103
104#ifndef ECB_MEMORY_FENCE
105 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
106 /* we assume that these memory fences work on all variables/all memory accesses, */
107 /* not just C11 atomics and atomic accesses */
108 #include <stdatomic.h>
109 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
110 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
111 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
112 #endif
113#endif
114
115#ifndef ECB_MEMORY_FENCE_RELEASE
116 #if ECB_GCC_VERSION(4,7)
117 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_ACQ_REL)
118 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
119 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
120 #endif
121#endif 102#endif
122 103
123#ifndef ECB_MEMORY_FENCE 104#ifndef ECB_MEMORY_FENCE
124 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 105 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
125 #if __i386 || __i386__ 106 #if __i386 || __i386__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 107 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
127 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 108 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
128 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 109 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
129 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 110 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 111 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
131 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 112 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
132 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 113 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
133 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 114 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
134 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
135 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 116 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
136 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 117 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 118 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
138 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 119 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
139 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 120 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
140 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 121 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
141 #elif __sparc || __sparc__ 122 #elif __sparc || __sparc__
142 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 123 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
143 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 124 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
144 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 125 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
145 #elif defined __s390__ || defined __s390x__ 126 #elif defined __s390__ || defined __s390x__
146 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 127 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
147 #elif defined __mips__ 128 #elif defined __mips__
148 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
149 #elif defined __alpha__ 130 #elif defined __alpha__
150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
132 #elif defined __hppa__
133 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
134 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
135 #elif defined __ia64__
136 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
151 #endif 137 #endif
152 #endif 138 #endif
153#endif 139#endif
154 140
155#ifndef ECB_MEMORY_FENCE 141#ifndef ECB_MEMORY_FENCE
142 #if ECB_GCC_VERSION(4,7)
143 /* see comment below about the C11 memory model. in short - avoid */
144 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
145 #elif defined __clang && __has_feature (cxx_atomic)
146 /* see above */
147 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
156 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 148 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 #define ECB_MEMORY_FENCE __sync_synchronize () 149 #define ECB_MEMORY_FENCE __sync_synchronize ()
158 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
159 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
160 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 150 #elif _MSC_VER >= 1400 /* VC++ 2005 */
161 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 151 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
162 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 152 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
163 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 153 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
164 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 154 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
… …
174 #define ECB_MEMORY_FENCE __sync () 164 #define ECB_MEMORY_FENCE __sync ()
175 #endif 165 #endif
176#endif 166#endif
177 167
178#ifndef ECB_MEMORY_FENCE 168#ifndef ECB_MEMORY_FENCE
169 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
170 /* we assume that these memory fences work on all variables/all memory accesses, */
171 /* not just C11 atomics and atomic accesses */
172 #include <stdatomic.h>
173 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
174 /* simple barrier semantics. That means we need to take out thor's hammer. */
175 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
176 #endif
177#endif
178
179#ifndef ECB_MEMORY_FENCE
179 #if !ECB_AVOID_PTHREADS 180 #if !ECB_AVOID_PTHREADS
180 /* 181 /*
181 * if you get undefined symbol references to pthread_mutex_lock, 182 * if you get undefined symbol references to pthread_mutex_lock,
182 * or failure to find pthread.h, then you should implement 183 * or failure to find pthread.h, then you should implement
183 * the ECB_MEMORY_FENCE operations for your cpu/compiler 184 * the ECB_MEMORY_FENCE operations for your cpu/compiler

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