1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2012 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
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6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
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10 // notice, this list of conditions and the following disclaimer.
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13 // in the documentation and/or other materials provided with the
14 // distribution.
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18 //
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29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 // This file is an internal atomic implementation, use atomicops.h instead.
32
33 #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
34 #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
35
36 // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
37 // which in turn means int. On some LP32 platforms, intptr_t is an int, but
38 // on others, it's a long. When AtomicWord and Atomic32 are based on different
39 // fundamental types, their pointers are incompatible.
40 //
41 // This file defines function overloads to allow both AtomicWord and Atomic32
42 // data to be used with this interface.
43 //
44 // On LP64 platforms, AtomicWord and Atomic64 are both always long,
45 // so this problem doesn't occur.
46
47 #if !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
48
49 namespace google {
50 namespace protobuf {
51 namespace internal {
52
NoBarrier_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)53 inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
54 AtomicWord old_value,
55 AtomicWord new_value) {
56 return NoBarrier_CompareAndSwap(
57 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
58 }
59
NoBarrier_AtomicExchange(volatile AtomicWord * ptr,AtomicWord new_value)60 inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
61 AtomicWord new_value) {
62 return NoBarrier_AtomicExchange(
63 reinterpret_cast<volatile Atomic32*>(ptr), new_value);
64 }
65
NoBarrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)66 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
67 AtomicWord increment) {
68 return NoBarrier_AtomicIncrement(
69 reinterpret_cast<volatile Atomic32*>(ptr), increment);
70 }
71
Barrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)72 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
73 AtomicWord increment) {
74 return Barrier_AtomicIncrement(
75 reinterpret_cast<volatile Atomic32*>(ptr), increment);
76 }
77
Acquire_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)78 inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
79 AtomicWord old_value,
80 AtomicWord new_value) {
81 return Acquire_CompareAndSwap(
82 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
83 }
84
Release_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)85 inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
86 AtomicWord old_value,
87 AtomicWord new_value) {
88 return Release_CompareAndSwap(
89 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
90 }
91
NoBarrier_Store(volatile AtomicWord * ptr,AtomicWord value)92 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
93 NoBarrier_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
94 }
95
Acquire_Store(volatile AtomicWord * ptr,AtomicWord value)96 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
97 return Acquire_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
98 }
99
Release_Store(volatile AtomicWord * ptr,AtomicWord value)100 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
101 return Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
102 }
103
NoBarrier_Load(volatile const AtomicWord * ptr)104 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
105 return NoBarrier_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
106 }
107
Acquire_Load(volatile const AtomicWord * ptr)108 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
109 return Acquire_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
110 }
111
Release_Load(volatile const AtomicWord * ptr)112 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
113 return Release_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
114 }
115
116 } // namespace internal
117 } // namespace protobuf
118 } // namespace google
119
120 #endif // !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
121
122 #endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
123