File: CacheChild.cpp

package info (click to toggle)
thunderbird 1:60.8.0-1~deb9u1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 2,339,208 kB
  • sloc: cpp: 5,456,704; ansic: 2,360,384; python: 596,095; asm: 340,963; java: 326,291; xml: 258,664; sh: 84,366; makefile: 23,702; perl: 17,317; objc: 3,768; yacc: 1,766; ada: 1,681; lex: 1,364; pascal: 1,264; cs: 879; exp: 527; php: 436; lisp: 258; ruby: 153; awk: 152; sed: 53; csh: 27
file content (151 lines) | stat: -rw-r--r-- 4,350 bytes parent folder | download | duplicates (12)
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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