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Comparing libeio/ecb.h (file contents):
Revision 1.12 by root, Mon May 28 17:00:19 2012 UTC vs.
Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC

… …
79 #else 79 #else
80 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 80 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81 #endif 81 #endif
82#endif 82#endif
83 83
84#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85#define ECB_C99 (__STDC_VERSION__ >= 199901L)
86#define ECB_C11 (__STDC_VERSION__ >= 201112L)
87#define ECB_CPP (__cplusplus+0)
88#define ECB_CPP11 (__cplusplus >= 201103L)
89
84/*****************************************************************************/ 90/*****************************************************************************/
85 91
86/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 92/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
87/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 93/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
88 94
89#if ECB_NO_THREADS 95#if ECB_NO_THREADS
90# define ECB_NO_SMP 1 96 #define ECB_NO_SMP 1
91#endif 97#endif
92 98
93#if ECB_NO_THREADS || ECB_NO_SMP 99#if ECB_NO_SMP
94 #define ECB_MEMORY_FENCE do { } while (0) 100 #define ECB_MEMORY_FENCE do { } while (0)
95#endif 101#endif
96 102
97#ifndef ECB_MEMORY_FENCE 103#ifndef ECB_MEMORY_FENCE
98 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 104 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
99 #if __i386 || __i386__ 105 #if __i386 || __i386__
100 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 106 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
101 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 107 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
102 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 108 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
103 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 109 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
104 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 110 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
105 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 111 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
106 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 112 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
107 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 113 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
108 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 114 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
109 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 115 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
110 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 116 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
111 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 117 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
112 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 118 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
113 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 119 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
114 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 120 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
115 #elif __sparc || __sparc__ 121 #elif __sparc || __sparc__
116 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
117 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 123 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
118 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 124 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
119 #elif defined __s390__ || defined __s390x__ 125 #elif defined __s390__ || defined __s390x__
120 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
121 #elif defined __mips__ 127 #elif defined __mips__
122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 128 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
123 #elif defined __alpha__ 129 #elif defined __alpha__
124 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
131 #elif defined __hppa__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
134 #elif defined __ia64__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
125 #endif 136 #endif
126 #endif 137 #endif
127#endif 138#endif
128 139
129#ifndef ECB_MEMORY_FENCE 140#ifndef ECB_MEMORY_FENCE
141 #if ECB_GCC_VERSION(4,7)
142 /* see comment below (stdatomic.h) about the C11 memory model. */
143 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
144 #elif defined __clang && __has_feature (cxx_atomic)
145 /* see comment below (stdatomic.h) about the C11 memory model. */
146 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
130 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 147 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
131 #define ECB_MEMORY_FENCE __sync_synchronize () 148 #define ECB_MEMORY_FENCE __sync_synchronize ()
132 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
133 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
134 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 149 #elif _MSC_VER >= 1400 /* VC++ 2005 */
135 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 150 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
136 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 151 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
137 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 152 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
138 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 153 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
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148 #define ECB_MEMORY_FENCE __sync () 163 #define ECB_MEMORY_FENCE __sync ()
149 #endif 164 #endif
150#endif 165#endif
151 166
152#ifndef ECB_MEMORY_FENCE 167#ifndef ECB_MEMORY_FENCE
168 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
169 /* we assume that these memory fences work on all variables/all memory accesses, */
170 /* not just C11 atomics and atomic accesses */
171 #include <stdatomic.h>
172 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
173 /* any fence other than seq_cst, which isn't very efficient for us. */
174 /* Why that is, we don't know - either the C11 memory model is quite useless */
175 /* for most usages, or gcc and clang have a bug */
176 /* I *currently* lean towards the latter, and inefficiently implement */
177 /* all three of ecb's fences as a seq_cst fence */
178 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
179 #endif
180#endif
181
182#ifndef ECB_MEMORY_FENCE
153 #if !ECB_AVOID_PTHREADS 183 #if !ECB_AVOID_PTHREADS
154 /* 184 /*
155 * if you get undefined symbol references to pthread_mutex_lock, 185 * if you get undefined symbol references to pthread_mutex_lock,
156 * or failure to find pthread.h, then you should implement 186 * or failure to find pthread.h, then you should implement
157 * the ECB_MEMORY_FENCE operations for your cpu/compiler 187 * the ECB_MEMORY_FENCE operations for your cpu/compiler
… …
175 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 205 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
176#endif 206#endif
177 207
178/*****************************************************************************/ 208/*****************************************************************************/
179 209
180#define ECB_C99 (__STDC_VERSION__ >= 199901L)
181
182#if __cplusplus 210#if __cplusplus
183 #define ecb_inline static inline 211 #define ecb_inline static inline
184#elif ECB_GCC_VERSION(2,5) 212#elif ECB_GCC_VERSION(2,5)
185 #define ecb_inline static __inline__ 213 #define ecb_inline static __inline__
186#elif ECB_C99 214#elif ECB_C99
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224#elif ECB_GCC_VERSION(3,0) 252#elif ECB_GCC_VERSION(3,0)
225 #define ecb_decltype(x) __typeof(x) 253 #define ecb_decltype(x) __typeof(x)
226#endif 254#endif
227 255
228#define ecb_noinline ecb_attribute ((__noinline__)) 256#define ecb_noinline ecb_attribute ((__noinline__))
229#define ecb_noreturn ecb_attribute ((__noreturn__))
230#define ecb_unused ecb_attribute ((__unused__)) 257#define ecb_unused ecb_attribute ((__unused__))
231#define ecb_const ecb_attribute ((__const__)) 258#define ecb_const ecb_attribute ((__const__))
232#define ecb_pure ecb_attribute ((__pure__)) 259#define ecb_pure ecb_attribute ((__pure__))
260
261#if ECB_C11
262 #define ecb_noreturn _Noreturn
263#else
264 #define ecb_noreturn ecb_attribute ((__noreturn__))
265#endif
233 266
234#if ECB_GCC_VERSION(4,3) 267#if ECB_GCC_VERSION(4,3)
235 #define ecb_artificial ecb_attribute ((__artificial__)) 268 #define ecb_artificial ecb_attribute ((__artificial__))
236 #define ecb_hot ecb_attribute ((__hot__)) 269 #define ecb_hot ecb_attribute ((__hot__))
237 #define ecb_cold ecb_attribute ((__cold__)) 270 #define ecb_cold ecb_attribute ((__cold__))

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