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67 | |
67 | |
68 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
68 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
69 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
69 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
70 | |
70 | |
71 | #if ECB_NO_THREADS || ECB_NO_SMP |
71 | #if ECB_NO_THREADS || ECB_NO_SMP |
72 | #define ECB_MEMORY_FENCE do { } while (0) |
72 | #define ECB_MEMORY_FENCE do { } while (0) |
73 | #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0) |
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74 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) |
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75 | #endif |
73 | #endif |
76 | |
74 | |
77 | #ifndef ECB_MEMORY_FENCE |
75 | #ifndef ECB_MEMORY_FENCE |
78 | #if ECB_GCC_VERSION(2,5) |
76 | #if ECB_GCC_VERSION(2,5) |
79 | #if __x86 |
77 | #if __x86 |
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82 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
80 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
83 | #elif __amd64 |
81 | #elif __amd64 |
84 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
82 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
85 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
83 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
86 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
84 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
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85 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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86 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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87 | #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ |
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88 | || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) |
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89 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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90 | #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ |
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91 | || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) |
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92 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
87 | #endif |
93 | #endif |
88 | #endif |
94 | #endif |
89 | #endif |
95 | #endif |
90 | |
96 | |
91 | #ifndef ECB_MEMORY_FENCE |
97 | #ifndef ECB_MEMORY_FENCE |
92 | #if ECB_GCC_VERSION(4,4) |
98 | #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) |
93 | #define ECB_MEMORY_FENCE __sync_synchronize () |
99 | #define ECB_MEMORY_FENCE __sync_synchronize () |
94 | #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) |
100 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
95 | #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) |
101 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
96 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
102 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
97 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
103 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
98 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
104 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
99 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
105 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
100 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
106 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
101 | #elif defined(_WIN32) |
107 | #elif defined(_WIN32) |
102 | #include <WinNT.h> |
108 | #include <WinNT.h> |
103 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
109 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
104 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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105 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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106 | #endif |
110 | #endif |
107 | #endif |
111 | #endif |
108 | |
112 | |
109 | #ifndef ECB_MEMORY_FENCE |
113 | #ifndef ECB_MEMORY_FENCE |
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114 | #if !ECB_AVOID_PTHREADS |
110 | /* |
115 | /* |
111 | * if you get undefined symbol references to pthread_mutex_lock, |
116 | * if you get undefined symbol references to pthread_mutex_lock, |
112 | * or failure to find pthread.h, then you should implement |
117 | * or failure to find pthread.h, then you should implement |
113 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
118 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
114 | * OR provide pthread.h and link against the posix thread library |
119 | * OR provide pthread.h and link against the posix thread library |
115 | * of your system. |
120 | * of your system. |
116 | */ |
121 | */ |
117 | #include <pthread.h> |
122 | #include <pthread.h> |
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123 | #define ECB_NEEDS_PTHREADS 1 |
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124 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
118 | |
125 | |
119 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
126 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
120 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
127 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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128 | #endif |
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129 | #endif |
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130 | |
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131 | #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
121 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
132 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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133 | #endif |
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134 | |
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135 | #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
122 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
136 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
123 | #endif |
137 | #endif |
124 | |
138 | |
125 | /*****************************************************************************/ |
139 | /*****************************************************************************/ |
126 | |
140 | |