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
|
/*
* Copyright (C) 2009, 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "GCThreadSharedData.h"
#include "CopyVisitor.h"
#include "CopyVisitorInlineMethods.h"
#include "GCThread.h"
#include "JSGlobalData.h"
#include "MarkStack.h"
#include "SlotVisitor.h"
#include "SlotVisitorInlineMethods.h"
namespace JSC {
#if ENABLE(PARALLEL_GC)
void GCThreadSharedData::resetChildren()
{
for (size_t i = 0; i < m_gcThreads.size(); ++i)
m_gcThreads[i]->slotVisitor()->reset();
}
size_t GCThreadSharedData::childVisitCount()
{
unsigned long result = 0;
for (unsigned i = 0; i < m_gcThreads.size(); ++i)
result += m_gcThreads[i]->slotVisitor()->visitCount();
return result;
}
#endif
GCThreadSharedData::GCThreadSharedData(JSGlobalData* globalData)
: m_globalData(globalData)
, m_copiedSpace(&globalData->heap.m_storageSpace)
, m_shouldHashConst(false)
, m_sharedMarkStack(m_segmentAllocator)
, m_numberOfActiveParallelMarkers(0)
, m_parallelMarkersShouldExit(false)
, m_blocksToCopy(globalData->heap.m_blockSnapshot)
, m_copyIndex(0)
, m_currentPhase(NoPhase)
{
m_copyLock.Init();
#if ENABLE(PARALLEL_GC)
// Grab the lock so the new GC threads can be properly initialized before they start running.
MutexLocker locker(m_markingLock);
for (unsigned i = 1; i < Options::numberOfGCMarkers(); ++i) {
SlotVisitor* slotVisitor = new SlotVisitor(*this);
CopyVisitor* copyVisitor = new CopyVisitor(*this);
GCThread* newThread = new GCThread(*this, slotVisitor, copyVisitor);
ThreadIdentifier threadID = createThread(GCThread::gcThreadStartFunc, newThread, "JavaScriptCore::Marking");
newThread->initializeThreadID(threadID);
m_gcThreads.append(newThread);
}
#endif
}
GCThreadSharedData::~GCThreadSharedData()
{
#if ENABLE(PARALLEL_GC)
// Destroy our marking threads.
{
MutexLocker markingLocker(m_markingLock);
MutexLocker phaseLocker(m_phaseLock);
ASSERT(m_currentPhase == NoPhase);
m_parallelMarkersShouldExit = true;
m_currentPhase = Exit;
m_phaseCondition.broadcast();
}
for (unsigned i = 0; i < m_gcThreads.size(); ++i) {
waitForThreadCompletion(m_gcThreads[i]->threadID());
delete m_gcThreads[i];
}
#endif
}
void GCThreadSharedData::reset()
{
ASSERT(m_sharedMarkStack.isEmpty());
#if ENABLE(PARALLEL_GC)
m_segmentAllocator.shrinkReserve();
m_opaqueRoots.clear();
#else
ASSERT(m_opaqueRoots.isEmpty());
#endif
m_weakReferenceHarvesters.removeAll();
if (m_shouldHashConst) {
m_globalData->resetNewStringsSinceLastHashConst();
m_shouldHashConst = false;
}
}
void GCThreadSharedData::didStartMarking()
{
MutexLocker markingLocker(m_markingLock);
MutexLocker phaseLocker(m_phaseLock);
ASSERT(m_currentPhase == NoPhase);
m_currentPhase = Mark;
m_parallelMarkersShouldExit = false;
m_phaseCondition.broadcast();
}
void GCThreadSharedData::didFinishMarking()
{
MutexLocker markingLocker(m_markingLock);
MutexLocker phaseLocker(m_phaseLock);
ASSERT(m_currentPhase == Mark);
m_currentPhase = NoPhase;
m_parallelMarkersShouldExit = true;
m_markingCondition.broadcast();
}
void GCThreadSharedData::didStartCopying()
{
{
SpinLockHolder locker(&m_copyLock);
m_blocksToCopy = m_globalData->heap.m_blockSnapshot;
m_copyIndex = 0;
}
// We do this here so that we avoid a race condition where the main thread can
// blow through all of the copying work before the GCThreads fully wake up.
// The GCThreads then request a block from the CopiedSpace when the copying phase
// has completed, which isn't allowed.
for (size_t i = 0; i < m_gcThreads.size(); i++)
m_gcThreads[i]->copyVisitor()->startCopying();
MutexLocker locker(m_phaseLock);
ASSERT(m_currentPhase == NoPhase);
m_currentPhase = Copy;
m_phaseCondition.broadcast();
}
void GCThreadSharedData::didFinishCopying()
{
MutexLocker locker(m_phaseLock);
ASSERT(m_currentPhase == Copy);
m_currentPhase = NoPhase;
m_phaseCondition.broadcast();
}
} // namespace JSC
|
