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Comparing libecb/ecb.h (file contents):
Revision 1.93 by root, Tue May 29 19:10:50 2012 UTC vs.
Revision 1.94 by root, Tue May 29 21:03:20 2012 UTC

… …
100#if 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 102#endif
103 103
104#ifndef ECB_MEMORY_FENCE 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 #if 0
110 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
111 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
112 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
113 #else
114 /* the above *should* be enough in my book, but after experiences with gcc-4.7 */
115 /* and clang, better play safe */
116 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
117 #endif
118 #endif
119#endif
120
121#ifndef ECB_MEMORY_FENCE
122 #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
123 #if __i386 || __i386__ 106 #if __i386 || __i386__
124 #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")
125 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 108 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
126 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 109 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
127 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 110 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
128 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 111 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
129 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 112 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
130 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 113 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
131 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 114 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
133 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 116 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
134 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 117 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
135 #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")
136 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 119 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
137 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 120 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
138 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 121 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
139 #elif __sparc || __sparc__ 122 #elif __sparc || __sparc__
140 #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")
141 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 124 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 125 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
143 #elif defined __s390__ || defined __s390x__ 126 #elif defined __s390__ || defined __s390x__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 127 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
145 #elif defined __mips__ 128 #elif defined __mips__
146 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
147 #elif defined __alpha__ 130 #elif defined __alpha__
148 #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")
149 #endif 137 #endif
150 #endif 138 #endif
151#endif 139#endif
152 140
153#ifndef ECB_MEMORY_FENCE 141#ifndef ECB_MEMORY_FENCE
154 #if ECB_GCC_VERSION(4,7) 142 #if ECB_GCC_VERSION(4,7)
155 /* unsolved mystery: ACQ_REL should be enough, but doesn't generate any code */ 143 /* see comment below about the C11 memory model. in short - avoid */
156 /* which in turn actually breaks libev */
157 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 144 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
158 #elif defined __clang && __has_feature (cxx_atomic) 145 #elif defined __clang && __has_feature (cxx_atomic)
159 /* see above */ 146 /* see above */
160 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 147 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
161 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 148 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
… …
179 #define ECB_MEMORY_FENCE __sync () 166 #define ECB_MEMORY_FENCE __sync ()
180 #endif 167 #endif
181#endif 168#endif
182 169
183#ifndef ECB_MEMORY_FENCE 170#ifndef ECB_MEMORY_FENCE
171 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
172 /* we assume that these memory fences work on all variables/all memory accesses, */
173 /* not just C11 atomics and atomic accesses */
174 #include <stdatomic.h>
175 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
176 /* simple barrier semantics. That means we need to take out thor's hammer. */
177 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
178 #endif
179 #endif
180#endif
181
182#ifndef ECB_MEMORY_FENCE
184 #if !ECB_AVOID_PTHREADS 183 #if !ECB_AVOID_PTHREADS
185 /* 184 /*
186 * if you get undefined symbol references to pthread_mutex_lock, 185 * if you get undefined symbol references to pthread_mutex_lock,
187 * or failure to find pthread.h, then you should implement 186 * or failure to find pthread.h, then you should implement
188 * the ECB_MEMORY_FENCE operations for your cpu/compiler 187 * the ECB_MEMORY_FENCE operations for your cpu/compiler

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