Atomic-win32.h

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00001 /*
00002  *    Copyright 2006 Intel Corporation
00003  * 
00004  *    Licensed under the Apache License, Version 2.0 (the "License");
00005  *    you may not use this file except in compliance with the License.
00006  *    You may obtain a copy of the License at
00007  * 
00008  *        http://www.apache.org/licenses/LICENSE-2.0
00009  * 
00010  *    Unless required by applicable law or agreed to in writing, software
00011  *    distributed under the License is distributed on an "AS IS" BASIS,
00012  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *    See the License for the specific language governing permissions and
00014  *    limitations under the License.
00015  */
00016 
00017 #ifndef __ATOMIC_WIN32_H__
00018 #define __ATOMIC_WIN32_H__
00019 
00020 #include <Windows.h>
00021 
00022 #include "../compat/inttypes.h"
00023 
00024 struct atomic_t {
00025     atomic_t(LONG l = 0) : value(l) {}
00026 
00027     volatile LONG value;
00028 };
00029 
00037 static inline void
00038 atomic_add(volatile atomic_t *v, int32_t i)
00039 {
00040     InterlockedExchangeAdd(&v->value, i);
00041 }
00042 
00050 // static inline void
00051 // atomic_sub(volatile atomic_t* v, int32_t i)
00052 // {
00053 //     __asm__ __volatile__(
00054 //         LOCK "subl %1,%0"
00055 //         :"=m" (v->value)
00056 //         :"ir" (i), "m" (v->value));
00057 // }
00058 
00064 static inline void
00065 atomic_incr(volatile atomic_t* v)
00066 {
00067     InterlockedIncrement(&v->value);
00068 }
00069 
00076 static inline void
00077 atomic_decr(volatile atomic_t* v)
00078 {
00079     InterlockedDecrement(&v->value);
00080 }
00081 
00091 static inline bool
00092 atomic_decr_test(volatile atomic_t* v)
00093 {
00094     return 0 == InterlockedDecrement(&v->value);
00095 }
00096 
00107 static inline int32_t
00108 atomic_cmpxchg32(volatile atomic_t* v, int32_t o, int32_t n)
00109 {
00110     return InterlockedCompareExchange(&v->value, 
00111                                       static_cast<LONG>(n), 
00112                                       static_cast<LONG>(o));
00113 }
00114 
00115 // /**
00116 //  * Atomic increment function that returns the new value. Note that the
00117 //  * implementation loops until it can successfully do the operation and
00118 //  * store the value, so there is an extremely low chance that this will
00119 //  * never return.
00120 //  *
00121 //  * @param v  pointer to current value
00122 //  */
00123 // static inline int32_t
00124 // atomic_incr_ret(volatile atomic_t* v)
00125 // {
00126 //     register volatile int32_t o, n;
00127     
00128 // #if defined(NDEBUG) && NDEBUG == 1
00129 //     while (1)
00130 // #else
00131 //     register int j;
00132 //     for (j = 0; j < 1000000; ++j)
00133 // #endif
00134 //     {
00135 //         o = v->value;
00136 //         n = o + 1;
00137 //         if (atomic_cmpxchg32(v, o, n) == o)
00138 //             return n;
00139 //     }
00140     
00141 //     NOTREACHED;
00142 //     return 0;
00143 // }
00144 
00145 // /**
00146 //  * Atomic addition function that returns the new value. Note that the
00147 //  * implementation loops until it can successfully do the operation and
00148 //  * store the value, so there is an extremely low chance that this will
00149 //  * never return.
00150 //  *
00151 //  * @param v  pointer to current value
00152 //  * @param i  integer to add
00153 //  */
00154 // static inline int32_t
00155 // atomic_add_ret(volatile atomic_t* v, int32_t i)
00156 // {
00157 //     register int32_t o, n;
00158     
00159 // #if defined(NDEBUG) && NDEBUG == 1
00160 //     while (1)
00161 // #else
00162 //     register int j;
00163 //     for (j = 0; j < 1000000; ++j)
00164 // #endif
00165 //     {
00166 //         o = v->value;
00167 //         n = o + i;
00168 //         if (atomic_cmpxchg32(v, o, n) == o)
00169 //             return n;
00170 //     }
00171     
00172 //     NOTREACHED;
00173 //     return 0;
00174 // }
00175 
00176 
00177 #endif /* __ATOMIC_WIN32_H__ */

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