1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_SHARED_IMPL_THREAD_AWARE_CALLBACK_H_
#define PPAPI_SHARED_IMPL_THREAD_AWARE_CALLBACK_H_
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "ppapi/shared_impl/ppapi_shared_export.h"
#include "ppapi/shared_impl/proxy_lock.h"
namespace ppapi {
class MessageLoopShared;
namespace internal {
class PPAPI_SHARED_EXPORT ThreadAwareCallbackBase {
protected:
ThreadAwareCallbackBase();
~ThreadAwareCallbackBase();
static bool HasTargetLoop();
void InternalRunOnTargetThread(const base::Closure& closure);
private:
class Core;
scoped_refptr<MessageLoopShared> target_loop_;
scoped_refptr<Core> core_;
DISALLOW_COPY_AND_ASSIGN(ThreadAwareCallbackBase);
};
} // namespace internal
// Some PPB interfaces have methods that set a custom callback. Usually, the
// callback has to be called on the same thread as the one it was set on.
// ThreadAwareCallback keeps track of the target thread, and posts a task to run
// on it if requested from a different thread.
//
// Please note that:
// - Unlike TrackedCallback, there is no restriction on how many times the
// callback will be called.
// - When a ThreadAwareCallback object is destroyed, all pending tasks to run
// the callback will be ignored. It is designed this way so that when the
// resource is destroyed or the callback is cancelled by the plugin, we can
// simply delete the ThreadAwareCallback object to prevent touching the
// callback later.
// - When RunOnTargetThread() is called on the target thread, the callback runs
// immediately.
template <class FuncType>
class ThreadAwareCallback : public internal::ThreadAwareCallbackBase {
public:
// The caller takes ownership of the returned object.
// NULL is returned if the current thread doesn't have an associated Pepper
// message loop, or |func| is NULL.
static ThreadAwareCallback* Create(FuncType func) {
if (!func || !HasTargetLoop())
return NULL;
return new ThreadAwareCallback(func);
}
~ThreadAwareCallback() {
}
void RunOnTargetThread() {
InternalRunOnTargetThread(base::Bind(func_));
}
template <class P1>
void RunOnTargetThread(const P1& p1) {
InternalRunOnTargetThread(base::Bind(func_, p1));
}
template <class P1, class P2>
void RunOnTargetThread(const P1& p1, const P2& p2) {
InternalRunOnTargetThread(base::Bind(func_, p1, p2));
}
template <class P1, class P2, class P3>
void RunOnTargetThread(const P1& p1, const P2& p2, const P3& p3) {
InternalRunOnTargetThread(base::Bind(func_, p1, p2, p3));
}
template <class P1, class P2, class P3, class P4>
void RunOnTargetThread(const P1& p1,
const P2& p2,
const P3& p3,
const P4& p4) {
InternalRunOnTargetThread(base::Bind(func_, p1, p2, p3, p4));
}
template <class P1, class P2, class P3, class P4, class P5>
void RunOnTargetThread(const P1& p1,
const P2& p2,
const P3& p3,
const P4& p4,
const P5& p5) {
InternalRunOnTargetThread(base::Bind(func_, p1, p2, p3, p4, p5));
}
private:
explicit ThreadAwareCallback(FuncType func) : func_(func) {
}
FuncType func_;
};
} // namespace ppapi
#endif // PPAPI_SHARED_IMPL_THREAD_AWARE_CALLBACK_H_
|
