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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/cache/CacheChild.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/cache/ActorUtils.h"
#include "mozilla/dom/cache/Cache.h"
#include "mozilla/dom/cache/CacheOpChild.h"
namespace mozilla {
namespace dom {
namespace cache {
// Declared in ActorUtils.h
PCacheChild*
AllocPCacheChild()
{
return new CacheChild();
}
// Declared in ActorUtils.h
void
DeallocPCacheChild(PCacheChild* aActor)
{
delete aActor;
}
CacheChild::CacheChild()
: mListener(nullptr)
, mNumChildActors(0)
, mDelayedDestroy(false)
, mLocked(false)
{
MOZ_COUNT_CTOR(cache::CacheChild);
}
CacheChild::~CacheChild()
{
MOZ_COUNT_DTOR(cache::CacheChild);
NS_ASSERT_OWNINGTHREAD(CacheChild);
MOZ_DIAGNOSTIC_ASSERT(!mListener);
MOZ_DIAGNOSTIC_ASSERT(!mNumChildActors);
MOZ_DIAGNOSTIC_ASSERT(!mLocked);
}
void
CacheChild::SetListener(Cache* aListener)
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
MOZ_DIAGNOSTIC_ASSERT(!mListener);
mListener = aListener;
MOZ_DIAGNOSTIC_ASSERT(mListener);
}
void
CacheChild::ClearListener()
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
MOZ_DIAGNOSTIC_ASSERT(mListener);
mListener = nullptr;
}
void
CacheChild::ExecuteOp(nsIGlobalObject* aGlobal, Promise* aPromise,
nsISupports* aParent, const CacheOpArgs& aArgs)
{
mNumChildActors += 1;
MOZ_ALWAYS_TRUE(SendPCacheOpConstructor(
new CacheOpChild(GetWorkerHolder(), aGlobal, aParent, aPromise), aArgs));
}
void
CacheChild::StartDestroyFromListener()
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
// The listener should be held alive by any async operations, so if it
// is going away then there must not be any child actors. This in turn
// ensures that StartDestroy() will not trigger the delayed path.
MOZ_DIAGNOSTIC_ASSERT(!mNumChildActors);
StartDestroy();
}
void
CacheChild::StartDestroy()
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
// If we have outstanding child actors, then don't destroy ourself yet.
// The child actors should be short lived and we should allow them to complete
// if possible. NoteDeletedActor() will call back into this Shutdown()
// method when the last child actor is gone. Also, delay destruction if we
// have been explicitly locked by someone using us on the stack.
if (mNumChildActors || mLocked) {
mDelayedDestroy = true;
return;
}
RefPtr<Cache> listener = mListener;
// StartDestroy() can get called from either Cache or the WorkerHolder.
// Theoretically we can get double called if the right race happens. Handle
// that by just ignoring the second StartDestroy() call.
if (!listener) {
return;
}
listener->DestroyInternal(this);
// Cache listener should call ClearListener() in DestroyInternal()
MOZ_DIAGNOSTIC_ASSERT(!mListener);
// Start actor destruction from parent process
Unused << SendTeardown();
}
void
CacheChild::ActorDestroy(ActorDestroyReason aReason)
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
RefPtr<Cache> listener = mListener;
if (listener) {
listener->DestroyInternal(this);
// Cache listener should call ClearListener() in DestroyInternal()
MOZ_DIAGNOSTIC_ASSERT(!mListener);
}
RemoveWorkerHolder();
}
PCacheOpChild*
CacheChild::AllocPCacheOpChild(const CacheOpArgs& aOpArgs)
{
MOZ_CRASH("CacheOpChild should be manually constructed.");
return nullptr;
}
bool
CacheChild::DeallocPCacheOpChild(PCacheOpChild* aActor)
{
delete aActor;
NoteDeletedActor();
return true;
}
void
CacheChild::NoteDeletedActor()
{
mNumChildActors -= 1;
MaybeFlushDelayedDestroy();
}
void
CacheChild::MaybeFlushDelayedDestroy()
{
if (!mNumChildActors && !mLocked && mDelayedDestroy) {
StartDestroy();
}
}
void
CacheChild::Lock()
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
MOZ_DIAGNOSTIC_ASSERT(!mLocked);
mLocked = true;
}
void
CacheChild::Unlock()
{
NS_ASSERT_OWNINGTHREAD(CacheChild);
MOZ_DIAGNOSTIC_ASSERT(mLocked);
mLocked = false;
MaybeFlushDelayedDestroy();
}
} // namespace cache
} // namespace dom
} // namespace mozilla
|
