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Side by Side Diff: src/base/once.h

Issue 2393603002: Revert of Turn libbase into a component (Closed)
Patch Set: Created 4 years, 2 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // emulates google3/base/once.h 5 // emulates google3/base/once.h
6 // 6 //
7 // This header is intended to be included only by v8's internal code. Users 7 // This header is intended to be included only by v8's internal code. Users
8 // should not use this directly. 8 // should not use this directly.
9 // 9 //
10 // This is basically a portable version of pthread_once(). 10 // This is basically a portable version of pthread_once().
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48 // but it is technically not guaranteed. Unfortunately, Win32 provides no way 48 // but it is technically not guaranteed. Unfortunately, Win32 provides no way
49 // whatsoever to statically-initialize its synchronization primitives, so our 49 // whatsoever to statically-initialize its synchronization primitives, so our
50 // only choice is to assume that dynamic initialization is single-threaded. 50 // only choice is to assume that dynamic initialization is single-threaded.
51 51
52 #ifndef V8_BASE_ONCE_H_ 52 #ifndef V8_BASE_ONCE_H_
53 #define V8_BASE_ONCE_H_ 53 #define V8_BASE_ONCE_H_
54 54
55 #include <stddef.h> 55 #include <stddef.h>
56 56
57 #include "src/base/atomicops.h" 57 #include "src/base/atomicops.h"
58 #include "src/base/base-export.h"
59 58
60 namespace v8 { 59 namespace v8 {
61 namespace base { 60 namespace base {
62 61
63 typedef AtomicWord OnceType; 62 typedef AtomicWord OnceType;
64 63
65 #define V8_ONCE_INIT 0 64 #define V8_ONCE_INIT 0
66 65
67 #define V8_DECLARE_ONCE(NAME) ::v8::base::OnceType NAME 66 #define V8_DECLARE_ONCE(NAME) ::v8::base::OnceType NAME
68 67
69 enum { 68 enum {
70 ONCE_STATE_UNINITIALIZED = 0, 69 ONCE_STATE_UNINITIALIZED = 0,
71 ONCE_STATE_EXECUTING_FUNCTION = 1, 70 ONCE_STATE_EXECUTING_FUNCTION = 1,
72 ONCE_STATE_DONE = 2 71 ONCE_STATE_DONE = 2
73 }; 72 };
74 73
75 typedef void (*NoArgFunction)(); 74 typedef void (*NoArgFunction)();
76 typedef void (*PointerArgFunction)(void* arg); 75 typedef void (*PointerArgFunction)(void* arg);
77 76
78 template <typename T> 77 template <typename T>
79 struct OneArgFunction { 78 struct OneArgFunction {
80 typedef void (*type)(T); 79 typedef void (*type)(T);
81 }; 80 };
82 81
83 V8_BASE_EXPORT void CallOnceImpl(OnceType* once, PointerArgFunction init_func, 82 void CallOnceImpl(OnceType* once, PointerArgFunction init_func, void* arg);
84 void* arg);
85 83
86 inline void CallOnce(OnceType* once, NoArgFunction init_func) { 84 inline void CallOnce(OnceType* once, NoArgFunction init_func) {
87 if (Acquire_Load(once) != ONCE_STATE_DONE) { 85 if (Acquire_Load(once) != ONCE_STATE_DONE) {
88 CallOnceImpl(once, reinterpret_cast<PointerArgFunction>(init_func), NULL); 86 CallOnceImpl(once, reinterpret_cast<PointerArgFunction>(init_func), NULL);
89 } 87 }
90 } 88 }
91 89
92 90
93 template <typename Arg> 91 template <typename Arg>
94 inline void CallOnce(OnceType* once, 92 inline void CallOnce(OnceType* once,
95 typename OneArgFunction<Arg*>::type init_func, Arg* arg) { 93 typename OneArgFunction<Arg*>::type init_func, Arg* arg) {
96 if (Acquire_Load(once) != ONCE_STATE_DONE) { 94 if (Acquire_Load(once) != ONCE_STATE_DONE) {
97 CallOnceImpl(once, reinterpret_cast<PointerArgFunction>(init_func), 95 CallOnceImpl(once, reinterpret_cast<PointerArgFunction>(init_func),
98 static_cast<void*>(arg)); 96 static_cast<void*>(arg));
99 } 97 }
100 } 98 }
101 99
102 } // namespace base 100 } // namespace base
103 } // namespace v8 101 } // namespace v8
104 102
105 #endif // V8_BASE_ONCE_H_ 103 #endif // V8_BASE_ONCE_H_
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