1 #ifndef _DEATOMIC_H
2 #define _DEATOMIC_H
3 /*-------------------------------------------------------------------------
4 * drawElements Thread Library
5 * ---------------------------
6 *
7 * Copyright 2014 The Android Open Source Project
8 *
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 *
21 *//*!
22 * \file
23 * \brief Atomic operations.
24 *//*--------------------------------------------------------------------*/
25
26 #include "deDefs.h"
27
28 #if (DE_COMPILER == DE_COMPILER_MSC)
29 # include <intrin.h>
30 #endif
31
32 DE_BEGIN_EXTERN_C
33
34 /*--------------------------------------------------------------------*//*!
35 * \brief Atomic increment and fetch.
36 * \param dstAddr Destination address.
37 * \return Incremented value.
38 *//*--------------------------------------------------------------------*/
deAtomicIncrement32(deInt32 volatile * dstAddr)39 DE_INLINE deInt32 deAtomicIncrement32 (deInt32 volatile* dstAddr)
40 {
41 #if (DE_COMPILER == DE_COMPILER_MSC)
42 return _InterlockedIncrement((long volatile*)dstAddr);
43 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
44 return __sync_add_and_fetch(dstAddr, 1);
45 #else
46 # error "Implement deAtomicIncrement32()"
47 #endif
48 }
49
50 /*--------------------------------------------------------------------*//*!
51 * \brief Atomic decrement and fetch.
52 * \param dstAddr Destination address.
53 * \return Decremented value.
54 *//*--------------------------------------------------------------------*/
deAtomicDecrement32(deInt32 volatile * dstAddr)55 DE_INLINE deInt32 deAtomicDecrement32 (deInt32 volatile* dstAddr)
56 {
57 #if (DE_COMPILER == DE_COMPILER_MSC)
58 return _InterlockedDecrement((long volatile*)dstAddr);
59 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
60 return __sync_sub_and_fetch(dstAddr, 1);
61 #else
62 # error "Implement deAtomicDecrement32()"
63 #endif
64 }
65
66 /*--------------------------------------------------------------------*//*!
67 * \brief Atomic compare and exchange (CAS).
68 * \param dstAddr Destination address.
69 * \param compare Old value.
70 * \param exchange New value.
71 * \return compare value if CAS passes, *dstAddr value otherwise
72 *
73 * Performs standard Compare-And-Swap with 32b data. Dst value is compared
74 * to compare value and if that comparison passes, value is replaced with
75 * exchange value.
76 *
77 * If CAS succeeds, compare value is returned. Otherwise value stored in
78 * dstAddr is returned.
79 *//*--------------------------------------------------------------------*/
deAtomicCompareExchange32(deUint32 volatile * dstAddr,deUint32 compare,deUint32 exchange)80 DE_INLINE deUint32 deAtomicCompareExchange32 (deUint32 volatile* dstAddr, deUint32 compare, deUint32 exchange)
81 {
82 #if (DE_COMPILER == DE_COMPILER_MSC)
83 return _InterlockedCompareExchange((long volatile*)dstAddr, exchange, compare);
84 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
85 return __sync_val_compare_and_swap(dstAddr, compare, exchange);
86 #else
87 # error "Implement deAtomicCompareExchange32()"
88 #endif
89 }
90
91 /*--------------------------------------------------------------------*//*!
92 * \brief Issue hardware memory read-write fence.
93 *//*--------------------------------------------------------------------*/
94 #if (DE_COMPILER == DE_COMPILER_MSC)
95 void deMemoryReadWriteFence (void);
96 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
deMemoryReadWriteFence(void)97 DE_INLINE void deMemoryReadWriteFence (void)
98 {
99 __sync_synchronize();
100 }
101 #else
102 # error "Implement deMemoryReadWriteFence()"
103 #endif
104
105 DE_END_EXTERN_C
106
107 #endif /* _DEATOMIC_H */
108