qreadwritelock.cpp

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6 ** Contact: https://www.qt.io/licensing/ -

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23 ** packaging of this file. Please review the following information to -

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38 ** $QT_END_LICENSE$ -

39 ** -

40 ****************************************************************************/ -

41 -

42 #include "qplatformdefs.h" -

43 #include "qreadwritelock.h" -

44 -

45 #ifndef QT_NO_THREAD -

46 #include "qmutex.h" -

47 #include "qthread.h" -

48 #include "qwaitcondition.h" -

49 #include "qreadwritelock_p.h" -

50 #include "qelapsedtimer.h" -

51 #include "private/qfreelist_p.h" -

52 -

53 QT_BEGIN_NAMESPACE -

54 -

55 /* -

56 * Implementation details of QReadWriteLock: -

57 * -

58 * Depending on the valued of d_ptr, the lock is in the following state: -

59 * - when d_ptr == 0x0: Unlocked (no readers, no writers) and non-recursive. -

60 * - when d_ptr & 0x1: If the least significant bit is set, we are locked for read. -

61 * In that case, d_ptr>>4 represents the number of reading threads minus 1. No writers -

62 * are waiting, and the lock is not recursive. -

63 * - when d_ptr == 0x2: We are locked for write and nobody is waiting. (no contention) -

64 * - In any other case, d_ptr points to an actual QReadWriteLockPrivate. -

65 */ -

66 -

67 namespace { -

68 enum { -

69 StateMask = 0x3, -

70 StateLockedForRead = 0x1, -

71 StateLockedForWrite = 0x2, -

72 }; -

73 const auto dummyLockedForRead = reinterpret_cast<QReadWriteLockPrivate *>(quintptr(StateLockedForRead)); -

74 const auto dummyLockedForWrite = reinterpret_cast<QReadWriteLockPrivate *>(quintptr(StateLockedForWrite)); -

75 inline bool isUncontendedLocked(const QReadWriteLockPrivate *d) -

{

executed 317361 times by 523 tests: return quintptr(d) & StateMask;

Executed by:

tst_QAbstractFileEngine
tst_QDBusAbstractInterface
tst_QDBusConnection
tst_QDBusConnection_NoApplication
tst_QDBusConnection_SpyHook
tst_QDBusServiceWatcher
tst_QDBusThreading
tst_QDirIterator
tst_QFile
tst_QGlobalStatic
tst_QMetaType
tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker
tst_collections - unknown status
tst_compiler - unknown status
tst_gestures - unknown status
tst_lancelot - unknown status
tst_languagechange - unknown status
tst_largefile - unknown status
tst_modeltest - unknown status
tst_networkselftest - unknown status
tst_platformsocketengine - unknown status
tst_q_func_info - unknown status
...

return quintptr(d) & StateMask; }

executed 317361 times by 523 tests: return quintptr(d) & StateMask;

Executed by:

tst_QAbstractFileEngine
tst_QDBusAbstractInterface
tst_QDBusConnection
tst_QDBusConnection_NoApplication
tst_QDBusConnection_SpyHook
tst_QDBusServiceWatcher
tst_QDBusThreading
tst_QDirIterator
tst_QFile
tst_QGlobalStatic
tst_QMetaType
tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker
tst_collections - unknown status
tst_compiler - unknown status
tst_gestures - unknown status
tst_lancelot - unknown status
tst_languagechange - unknown status
tst_largefile - unknown status
tst_modeltest - unknown status
tst_networkselftest - unknown status
tst_platformsocketengine - unknown status
tst_q_func_info - unknown status
...

317361

77 } -

78 -

79 /*! \class QReadWriteLock -

80 \inmodule QtCore -

81 \brief The QReadWriteLock class provides read-write locking. -

82 -

83 \threadsafe -

84 -

85 \ingroup thread -

86 -

87 A read-write lock is a synchronization tool for protecting -

88 resources that can be accessed for reading and writing. This type -

89 of lock is useful if you want to allow multiple threads to have -

90 simultaneous read-only access, but as soon as one thread wants to -

91 write to the resource, all other threads must be blocked until -

92 the writing is complete. -

93 -

94 In many cases, QReadWriteLock is a direct competitor to QMutex. -

95 QReadWriteLock is a good choice if there are many concurrent -

96 reads and writing occurs infrequently. -

97 -

98 Example: -

99 -

100 \snippet code/src_corelib_thread_qreadwritelock.cpp 0 -

101 -

102 To ensure that writers aren't blocked forever by readers, readers -

103 attempting to obtain a lock will not succeed if there is a blocked -

104 writer waiting for access, even if the lock is currently only -

105 accessed by other readers. Also, if the lock is accessed by a -

106 writer and another writer comes in, that writer will have -

107 priority over any readers that might also be waiting. -

108 -

109 Like QMutex, a QReadWriteLock can be recursively locked by the -

110 same thread when constructed with \l{QReadWriteLock::Recursive} as -

111 \l{QReadWriteLock::RecursionMode}. In such cases, -

112 unlock() must be called the same number of times lockForWrite() or -

113 lockForRead() was called. Note that the lock type cannot be -

114 changed when trying to lock recursively, i.e. it is not possible -

115 to lock for reading in a thread that already has locked for -

116 writing (and vice versa). -

117 -

118 \sa QReadLocker, QWriteLocker, QMutex, QSemaphore -

119 */ -

120 -

121 /*! -

122 \enum QReadWriteLock::RecursionMode -

123 \since 4.4 -

124 -

125 \value Recursive In this mode, a thread can lock the same -

126 QReadWriteLock multiple times. The QReadWriteLock won't be unlocked -

127 until a corresponding number of unlock() calls have been made. -

128 -

129 \value NonRecursive In this mode, a thread may only lock a -

130 QReadWriteLock once. -

131 -

132 \sa QReadWriteLock() -

133 */ -

134 -

135 /*! -

136 \since 4.4 -

137 -

138 Constructs a QReadWriteLock object in the given \a recursionMode. -

139 -

140 The default recursion mode is NonRecursive. -

141 -

142 \sa lockForRead(), lockForWrite(), RecursionMode -

143 */ -

144 QReadWriteLock::QReadWriteLock(RecursionMode recursionMode) -

145 : d_ptr(recursionMode == Recursive ? new QReadWriteLockPrivate(true) : nullptr) -

146 { -

147 Q_ASSERT_X(!(quintptr(d_ptr.load()) & StateMask), "QReadWriteLock::QReadWriteLock", "bad d_ptr alignment"); -

148

}

executed 42232 times by 296 tests: end of block

Executed by:

tst_Gestures
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
tst_QBoxLayout
tst_QButtonGroup
tst_QCalendarWidget
...

42232

149 -

150 /*! -

151 Destroys the QReadWriteLock object. -

152 -

153 \warning Destroying a read-write lock that is in use may result -

154 in undefined behavior. -

155 */ -

156 QReadWriteLock::~QReadWriteLock() -

157 { -

158 auto d = d_ptr.load(); -

159

if (isUncontendedLocked(d)) {

isUncontendedLocked(d)

Description

TRUE

never evaluated

FALSE

evaluated 43112 times by 519 tests

Evaluated by:

tst_QDBusAbstractInterface
tst_QDBusConnection
tst_QDBusConnection_NoApplication
tst_QDBusConnection_SpyHook
tst_QDBusServiceWatcher
tst_QDBusThreading
tst_QGlobalStatic
tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker
tst_collections - unknown status
tst_compiler - unknown status
tst_gestures - unknown status
tst_lancelot - unknown status
tst_languagechange - unknown status
tst_largefile - unknown status
tst_modeltest - unknown status
tst_networkselftest - unknown status
tst_platformsocketengine - unknown status
tst_q_func_info - unknown status
tst_qabstractanimation - unknown status
tst_qabstractbutton - unknown status
tst_qabstractfileengine - unknown status
tst_qabstractitemmodel - unknown status
...

0-43112

160 qWarning("QReadWriteLock: destroying locked QReadWriteLock"); -

161

return;

never executed: return;

162 } -

163 delete d; -

164

}

executed 43112 times by 519 tests: end of block

Executed by:

tst_QDBusAbstractInterface
tst_QDBusConnection
tst_QDBusConnection_NoApplication
tst_QDBusConnection_SpyHook
tst_QDBusServiceWatcher
tst_QDBusThreading
tst_QGlobalStatic
tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker
tst_collections - unknown status
tst_compiler - unknown status
tst_gestures - unknown status
tst_lancelot - unknown status
tst_languagechange - unknown status
tst_largefile - unknown status
tst_modeltest - unknown status
tst_networkselftest - unknown status
tst_platformsocketengine - unknown status
tst_q_func_info - unknown status
tst_qabstractanimation - unknown status
tst_qabstractbutton - unknown status
tst_qabstractfileengine - unknown status
tst_qabstractitemmodel - unknown status
...

43112

165 -

166 /*! -

167 Locks the lock for reading. This function will block the current -

168 thread if another thread has locked for writing. -

169 -

170 It is not possible to lock for read if the thread already has -

171 locked for write. -

172 -

173 \sa unlock(), lockForWrite(), tryLockForRead() -

174 */ -

175 void QReadWriteLock::lockForRead() -

176 { -

177

if (d_ptr.testAndSetAcquire(nullptr, dummyLockedForRead))

d_ptr.testAndS...LockedForRead)

Description

TRUE

evaluated 1557572 times by 355 tests

Evaluated by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
tst_QBoxLayout
tst_QButtonGroup
...

FALSE

evaluated 143670 times by 10 tests

Evaluated by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QGuiEventLoop
tst_QHostInfo
tst_QMetaType
tst_QNetworkReply
tst_QReadWriteLock
tst_QWaitCondition
tst_Spdy

143670-1557572

178

return;

executed 1557572 times by 355 tests: return;

Executed by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
tst_QBoxLayout
tst_QButtonGroup
...

1557572

179 tryLockForRead(-1); -

180

}

executed 143670 times by 10 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QGuiEventLoop
tst_QHostInfo
tst_QMetaType
tst_QNetworkReply
tst_QReadWriteLock
tst_QWaitCondition
tst_Spdy

143670

181 -

182 /*! -

183 Attempts to lock for reading. If the lock was obtained, this -

184 function returns \c true, otherwise it returns \c false instead of -

185 waiting for the lock to become available, i.e. it does not block. -

186 -

187 The lock attempt will fail if another thread has locked for -

188 writing. -

189 -

190 If the lock was obtained, the lock must be unlocked with unlock() -

191 before another thread can successfully lock it for writing. -

192 -

193 It is not possible to lock for read if the thread already has -

194 locked for write. -

195 -

196 \sa unlock(), lockForRead() -

197 */ -

198 bool QReadWriteLock::tryLockForRead() -

199 { -

200

return tryLockForRead(0);

executed 43 times by 2 tests: return tryLockForRead(0);

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

201 } -

202 -

203 /*! \overload -

204 -

205 Attempts to lock for reading. This function returns \c true if the -

206 lock was obtained; otherwise it returns \c false. If another thread -

207 has locked for writing, this function will wait for at most \a -

208 timeout milliseconds for the lock to become available. -

209 -

210 Note: Passing a negative number as the \a timeout is equivalent to -

211 calling lockForRead(), i.e. this function will wait forever until -

212 lock can be locked for reading when \a timeout is negative. -

213 -

214 If the lock was obtained, the lock must be unlocked with unlock() -

215 before another thread can successfully lock it for writing. -

216 -

217 It is not possible to lock for read if the thread already has -

218 locked for write. -

219 -

220 \sa unlock(), lockForRead() -

221 */ -

222 bool QReadWriteLock::tryLockForRead(int timeout) -

223 { -

224 // Fast case: non contended: -

225 QReadWriteLockPrivate *d; -

226

if (d_ptr.testAndSetAcquire(nullptr, dummyLockedForRead, d))

d_ptr.testAndS...kedForRead, d)	Description
TRUE	evaluated 4 times by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 143712 times by 10 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_QWaitCondition tst_Spdy

4-143712

227

return true;

executed 4 times by 1 test: return true;

Executed by:

tst_QReadWriteLock

228 -

229 while (true) { -

230

if (d == 0) {

d == 0	Description
TRUE	never evaluated
FALSE	evaluated 143712 times by 10 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_QWaitCondition tst_Spdy

0-143712

231

if (!d_ptr.testAndSetAcquire(nullptr, dummyLockedForRead, d))

!d_ptr.testAnd...kedForRead, d)	Description
TRUE	never evaluated
FALSE	never evaluated

232

continue;

never executed: continue;

233

return true;

never executed: return true;

234 } -

235 -

236

if ((quintptr(d) & StateMask) == StateLockedForRead) {

(quintptr(d) &...eLockedForRead	Description
TRUE	evaluated 11198 times by 6 tests Evaluated by: tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_Spdy
FALSE	evaluated 132514 times by 6 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

11198-132514

237 // locked for read, increase the counter -

238 const auto val = reinterpret_cast<QReadWriteLockPrivate *>(quintptr(d) + (1U<<4)); -

239 Q_ASSERT_X(quintptr(val) > (1U<<4), "QReadWriteLock::tryLockForRead()", -

240 "Overflow in lock counter"); -

241

if (!d_ptr.testAndSetAcquire(d, val, d))

!d_ptr.testAnd...ire(d, val, d)	Description
TRUE	never evaluated
FALSE	evaluated 11198 times by 6 tests Evaluated by: tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_Spdy

0-11198

242

continue;

never executed: continue;

243

return true;

executed 11198 times by 6 tests: return true;

Executed by:

tst_QGuiEventLoop
tst_QHostInfo
tst_QMetaType
tst_QNetworkReply
tst_QReadWriteLock
tst_Spdy

11198

244 } -

245 -

246

if (d == dummyLockedForWrite) {

d == dummyLockedForWrite	Description
TRUE	evaluated 42 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 132472 times by 6 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

42-132472

247

if (!timeout)

!timeout	Description
TRUE	evaluated 2 times by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 40 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

2-40

248

return false;

executed 2 times by 1 test: return false;

Executed by:

tst_QReadWriteLock

249 -

250 // locked for write, assign a d_ptr and wait. -

251 auto val = QReadWriteLockPrivate::allocate(); -

252 val->writerCount = 1; -

253

if (!d_ptr.testAndSetOrdered(d, val, d)) {

!d_ptr.testAnd...red(d, val, d)	Description
TRUE	never evaluated
FALSE	evaluated 40 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

0-40

254 val->writerCount = 0; -

255 val->release(); -

256

continue;

never executed: continue;

257 } -

258 d = val; -

259

}

executed 40 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

260 Q_ASSERT(!isUncontendedLocked(d)); -

261 // d is an actual pointer; -

262 -

263

if (d->recursive)

d->recursive	Description
TRUE	evaluated 126 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 132386 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

126-132386

264

return d->recursiveLockForRead(timeout);

executed 126 times by 5 tests: return d->recursiveLockForRead(timeout);

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

126

265 -

266 QMutexLocker lock(&d->mutex); -

267

if (d != d_ptr.load()) {

d != d_ptr.load()	Description
TRUE	never evaluated
FALSE	evaluated 132386 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

0-132386

268 // d_ptr has changed: this QReadWriteLock was unlocked before we had -

269 // time to lock d->mutex. -

270 // We are holding a lock to a mutex within a QReadWriteLockPrivate -

271 // that is already released (or even is already re-used). That's ok -

272 // because the QFreeList never frees them. -

273 // Just unlock d->mutex (at the end of the scope) and retry. -

274 d = d_ptr.loadAcquire(); -

275

continue;

never executed: continue;

276 } -

277

return d->lockForRead(timeout);

executed 132386 times by 3 tests: return d->lockForRead(timeout);

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

132386

278 } -

279

}

never executed: end of block

280 -

281 /*! -

282 Locks the lock for writing. This function will block the current -

283 thread if another thread (including the current) has locked for -

284 reading or writing (unless the lock has been created using the -

285 \l{QReadWriteLock::Recursive} mode). -

286 -

287 It is not possible to lock for write if the thread already has -

288 locked for read. -

289 -

290 \sa unlock(), lockForRead(), tryLockForWrite() -

291 */ -

292 void QReadWriteLock::lockForWrite() -

293 { -

294 tryLockForWrite(-1); -

295

}

executed 348346 times by 568 tests: end of block

Executed by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
...

348346

296 -

297 /*! -

298 Attempts to lock for writing. If the lock was obtained, this -

299 function returns \c true; otherwise, it returns \c false immediately. -

300 -

301 The lock attempt will fail if another thread has locked for -

302 reading or writing. -

303 -

304 If the lock was obtained, the lock must be unlocked with unlock() -

305 before another thread can successfully lock it. -

306 -

307 It is not possible to lock for write if the thread already has -

308 locked for read. -

309 -

310 \sa unlock(), lockForWrite() -

311 */ -

312 bool QReadWriteLock::tryLockForWrite() -

313 { -

314

return tryLockForWrite(0);

executed 62 times by 4 tests: return tryLockForWrite(0);

Executed by:

tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker

315 } -

316 -

317 /*! \overload -

318 -

319 Attempts to lock for writing. This function returns \c true if the -

320 lock was obtained; otherwise it returns \c false. If another thread -

321 has locked for reading or writing, this function will wait for at -

322 most \a timeout milliseconds for the lock to become available. -

323 -

324 Note: Passing a negative number as the \a timeout is equivalent to -

325 calling lockForWrite(), i.e. this function will wait forever until -

326 lock can be locked for writing when \a timeout is negative. -

327 -

328 If the lock was obtained, the lock must be unlocked with unlock() -

329 before another thread can successfully lock it. -

330 -

331 It is not possible to lock for write if the thread already has -

332 locked for read. -

333 -

334 \sa unlock(), lockForWrite() -

335 */ -

336 bool QReadWriteLock::tryLockForWrite(int timeout) -

337 { -

338 // Fast case: non contended: -

339 QReadWriteLockPrivate *d; -

340

if (d_ptr.testAndSetAcquire(nullptr, dummyLockedForWrite, d))

d_ptr.testAndS...edForWrite, d)

Description

TRUE

evaluated 345353 times by 565 tests

Evaluated by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
tst_QBoxLayout
...

FALSE

evaluated 3057 times by 11 tests

Evaluated by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QMetaType
tst_QReadLocker
tst_QReadWriteLock
tst_QWaitCondition
tst_QWriteLocker
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

3057-345353

341

return true;

executed 345353 times by 565 tests: return true;

Executed by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
tst_QBoxLayout
...

345353

342 -

343 while (true) { -

344

if (d == 0) {

d == 0	Description
TRUE	never evaluated
FALSE	evaluated 3057 times by 11 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadLocker tst_QReadWriteLock tst_QWaitCondition tst_QWriteLocker tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

0-3057

345

if (!d_ptr.testAndSetAcquire(d, dummyLockedForWrite, d))

!d_ptr.testAnd...edForWrite, d)	Description
TRUE	never evaluated
FALSE	never evaluated

346

continue;

never executed: continue;

347

return true;

never executed: return true;

348 } -

349 -

350

if (isUncontendedLocked(d)) {

isUncontendedLocked(d)	Description
TRUE	evaluated 88 times by 5 tests Evaluated by: tst_QMetaType tst_QReadLocker tst_QReadWriteLock tst_QWaitCondition tst_QWriteLocker
FALSE	evaluated 2969 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

88-2969

351

if (!timeout)

!timeout	Description
TRUE	evaluated 10 times by 3 tests Evaluated by: tst_QReadLocker tst_QReadWriteLock tst_QWriteLocker
FALSE	evaluated 78 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

10-78

352

return false;

executed 10 times by 3 tests: return false;

Executed by:

tst_QReadLocker
tst_QReadWriteLock
tst_QWriteLocker

353 -

354 // locked for either read or write, assign a d_ptr and wait. -

355 auto val = QReadWriteLockPrivate::allocate(); -

356

if (d == dummyLockedForWrite)

d == dummyLockedForWrite	Description
TRUE	evaluated 54 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 24 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

24-54

357

val->writerCount = 1;

executed 54 times by 3 tests: val->writerCount = 1;

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

358 else -

359

val->readerCount = (quintptr(d) >> 4) + 1;

executed 24 times by 3 tests: val->readerCount = (quintptr(d) >> 4) + 1;

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

360

if (!d_ptr.testAndSetOrdered(d, val, d)) {

!d_ptr.testAnd...red(d, val, d)	Description
TRUE	never evaluated
FALSE	evaluated 78 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

0-78

361 val->writerCount = val->readerCount = 0; -

362 val->release(); -

363

continue;

never executed: continue;

364 } -

365 d = val; -

366

}

executed 78 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

367 Q_ASSERT(!isUncontendedLocked(d)); -

368 // d is an actual pointer; -

369 -

370

if (d->recursive)

d->recursive	Description
TRUE	evaluated 76 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status
FALSE	evaluated 2971 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

76-2971

371

return d->recursiveLockForWrite(timeout);

executed 76 times by 8 tests: return d->recursiveLockForWrite(timeout);

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

372 -

373 QMutexLocker lock(&d->mutex); -

374

if (d != d_ptr.load()) {

d != d_ptr.load()	Description
TRUE	never evaluated
FALSE	evaluated 2971 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

0-2971

375 // The mutex was unlocked before we had time to lock the mutex. -

376 // We are holding to a mutex within a QReadWriteLockPrivate that is already released -

377 // (or even is already re-used) but that's ok because the QFreeList never frees them. -

378 d = d_ptr.loadAcquire(); -

379

continue;

never executed: continue;

380 } -

381

return d->lockForWrite(timeout);

executed 2971 times by 3 tests: return d->lockForWrite(timeout);

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

2971

382 } -

383

}

never executed: end of block

384 -

385 /*! -

386 Unlocks the lock. -

387 -

388 Attempting to unlock a lock that is not locked is an error, and will result -

389 in program termination. -

390 -

391 \sa lockForRead(), lockForWrite(), tryLockForRead(), tryLockForWrite() -

392 */ -

393 void QReadWriteLock::unlock() -

394 { -

395 QReadWriteLockPrivate *d = d_ptr.load(); -

396 while (true) { -

397 Q_ASSERT_X(d, "QReadWriteLock::unlock()", "Cannot unlock an unlocked lock"); -

398 -

399 // Fast case: no contention: (no waiters, no other readers) -

400

if (quintptr(d) <= 2) { // 1 or 2 (StateLockedForRead or StateLockedForWrite)

quintptr(d) <= 2

Description

TRUE

evaluated 1902811 times by 572 tests

Evaluated by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
...

FALSE

evaluated 146830 times by 13 tests

Evaluated by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QGuiEventLoop
tst_QHostInfo
tst_QMetaType
tst_QNetworkReply
tst_QReadWriteLock
tst_QWaitCondition
tst_Spdy
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

146830-1902811

401

if (!d_ptr.testAndSetRelease(d, nullptr, d))

!d_ptr.testAnd...d, nullptr, d)

Description

TRUE

evaluated 1 time by 1 test

Evaluated by:

tst_QReadWriteLock

FALSE

evaluated 1902810 times by 572 tests

Evaluated by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
...

1-1902810

402

continue;

executed 1 time by 1 test: continue;

Executed by:

tst_QReadWriteLock

403

return;

executed 1902810 times by 572 tests: return;

Executed by:

tst_Gestures
tst_Lancelot
tst_ModelTest
tst_NetworkSelfTest
tst_QAbstractButton
tst_QAbstractFileEngine
tst_QAbstractItemModel
tst_QAbstractItemView
tst_QAbstractNetworkCache
tst_QAbstractPrintDialog
tst_QAbstractProxyModel
tst_QAbstractScrollArea
tst_QAbstractSlider
tst_QAbstractSpinBox
tst_QAbstractTextDocumentLayout
tst_QAccessibility
tst_QAction
tst_QActionGroup
tst_QAlgorithms
tst_QAnimationGroup
tst_QApplication
tst_QArrayData
tst_QArrayData_StrictIterators
tst_QAsn1Element
tst_QBackingStore
...

1902810

404 } -

405 -

406

if ((quintptr(d) & StateMask) == StateLockedForRead) {

(quintptr(d) &...eLockedForRead	Description
TRUE	evaluated 11197 times by 6 tests Evaluated by: tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_Spdy
FALSE	evaluated 135633 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

11197-135633

407 Q_ASSERT(quintptr(d) > (1U<<4)); //otherwise that would be the fast case -

408 // Just decrease the reader's count. -

409 auto val = reinterpret_cast<QReadWriteLockPrivate *>(quintptr(d) - (1U<<4)); -

410

if (!d_ptr.testAndSetRelease(d, val, d))

!d_ptr.testAnd...ase(d, val, d)	Description
TRUE	never evaluated
FALSE	evaluated 11197 times by 6 tests Evaluated by: tst_QGuiEventLoop tst_QHostInfo tst_QMetaType tst_QNetworkReply tst_QReadWriteLock tst_Spdy

0-11197

411

continue;

never executed: continue;

412

return;

executed 11197 times by 6 tests: return;

Executed by:

tst_QGuiEventLoop
tst_QHostInfo
tst_QMetaType
tst_QNetworkReply
tst_QReadWriteLock
tst_Spdy

11197

413 } -

414 -

415 Q_ASSERT(!isUncontendedLocked(d)); -

416 -

417

if (d->recursive) {

d->recursive	Description
TRUE	evaluated 159 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status
FALSE	evaluated 135474 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

159-135474

418 d->recursiveUnlock(); -

419

return;

executed 159 times by 8 tests: return;

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

159

420 } -

421 -

422 QMutexLocker locker(&d->mutex); -

423

if (d->writerCount) {

d->writerCount	Description
TRUE	evaluated 3064 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 132410 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

3064-132410

424 Q_ASSERT(d->writerCount == 1); -

425 Q_ASSERT(d->readerCount == 0); -

426 d->writerCount = 0; -

427

} else {

executed 3064 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

3064

428 Q_ASSERT(d->readerCount > 0); -

429 d->readerCount--; -

430

if (d->readerCount > 0)

d->readerCount > 0	Description
TRUE	evaluated 132145 times by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 265 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

265-132145

431

return;

executed 132145 times by 1 test: return;

Executed by:

tst_QReadWriteLock

132145

432

}

executed 265 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

265

433 -

434

if (d->waitingReaders || d->waitingWriters) {

d->waitingReaders	Description
TRUE	evaluated 327 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 3002 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

d->waitingWriters	Description
TRUE	evaluated 2884 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 118 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

118-3002

435 d->unlock(); -

436

} else {

executed 3211 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

3211

437 Q_ASSERT(d_ptr.load() == d); // should not change when we still hold the mutex -

438 d_ptr.storeRelease(nullptr); -

439 d->release(); -

440

}

executed 118 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

118

441

return;

executed 3329 times by 3 tests: return;

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

3329

442 } -

443

}

never executed: end of block

444 -

445 /*! \internal Helper for QWaitCondition::wait */ -

446 QReadWriteLock::StateForWaitCondition QReadWriteLock::stateForWaitCondition() const -

447 { -

448 QReadWriteLockPrivate *d = d_ptr.load(); -

449 switch (quintptr(d) & StateMask) { -

450

case StateLockedForRead: return LockedForRead;

executed 25 times by 1 test: return LockedForRead;

Executed by:

tst_QWaitCondition

executed 25 times by 1 test: case StateLockedForRead:

Executed by:

tst_QWaitCondition

451

case StateLockedForWrite: return LockedForWrite;

executed 108 times by 1 test: return LockedForWrite;

Executed by:

tst_QWaitCondition

executed 108 times by 1 test: case StateLockedForWrite:

Executed by:

tst_QWaitCondition

108

452 } -

453 -

454

if (!d)

!d	Description
TRUE	never evaluated
FALSE	evaluated 141 times by 1 test Evaluated by: tst_QWaitCondition

0-141

455

return Unlocked;

never executed: return Unlocked;

456

if (d->writerCount > 1)

d->writerCount > 1	Description
TRUE	never evaluated
FALSE	evaluated 141 times by 1 test Evaluated by: tst_QWaitCondition

0-141

457

return RecursivelyLocked;

never executed: return RecursivelyLocked;

458

else if (d->writerCount == 1)

d->writerCount == 1	Description
TRUE	evaluated 123 times by 1 test Evaluated by: tst_QWaitCondition
FALSE	evaluated 18 times by 1 test Evaluated by: tst_QWaitCondition

18-123

459

return LockedForWrite;

executed 123 times by 1 test: return LockedForWrite;

Executed by:

tst_QWaitCondition

123

460

return LockedForRead;

executed 18 times by 1 test: return LockedForRead;

Executed by:

tst_QWaitCondition

461 -

462 } -

463 -

464 bool QReadWriteLockPrivate::lockForRead(int timeout) -

465 { -

466 Q_ASSERT(!mutex.tryLock()); // mutex must be locked when entering this function -

467 -

468 QElapsedTimer t; -

469

if (timeout > 0)

timeout > 0	Description
TRUE	evaluated 1 time by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 132492 times by 6 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

1-132492

470

t.start();

executed 1 time by 1 test: t.start();

Executed by:

tst_QReadWriteLock

471 -

472

while (waitingWriters || writerCount) {

waitingWriters	Description
TRUE	evaluated 386 times by 2 tests Evaluated by: tst_QMetaType tst_QReadWriteLock
FALSE	evaluated 132543 times by 6 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

writerCount	Description
TRUE	evaluated 72 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 132471 times by 6 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

72-132543

473

if (timeout == 0)

timeout == 0	Description
TRUE	evaluated 21 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 437 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

21-437

474

return false;

executed 21 times by 2 tests: return false;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

475

if (timeout > 0) {

timeout > 0	Description
TRUE	evaluated 8 times by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 429 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

8-429

476 auto elapsed = t.elapsed(); -

477

if (elapsed > timeout)

elapsed > timeout	Description
TRUE	evaluated 1 time by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 7 times by 1 test Evaluated by: tst_QReadWriteLock

1-7

478

return false;

executed 1 time by 1 test: return false;

Executed by:

tst_QReadWriteLock

479 waitingReaders++; -

480 readerCond.wait(&mutex, timeout - elapsed); -

481

} else {

executed 7 times by 1 test: end of block

Executed by:

tst_QReadWriteLock

482 waitingReaders++; -

483 readerCond.wait(&mutex); -

484

}

executed 429 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

429

485 waitingReaders--; -

486

}

executed 436 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

436

487 readerCount++; -

488 Q_ASSERT(writerCount == 0); -

489

return true;

executed 132471 times by 6 tests: return true;

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

132471

490 } -

491 -

492 bool QReadWriteLockPrivate::lockForWrite(int timeout) -

493 { -

494 Q_ASSERT(!mutex.tryLock()); // mutex must be locked when entering this function -

495 -

496 QElapsedTimer t; -

497

if (timeout > 0)

timeout > 0	Description
TRUE	evaluated 1 time by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 3034 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

1-3034

498

t.start();

executed 1 time by 1 test: t.start();

Executed by:

tst_QReadWriteLock

499 -

500

while (readerCount || writerCount) {

readerCount	Description
TRUE	evaluated 74 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 3276 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

writerCount	Description
TRUE	evaluated 264 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 3012 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

74-3276

501

if (timeout == 0)

timeout == 0	Description
TRUE	evaluated 22 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 316 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

22-316

502

return false;

executed 22 times by 2 tests: return false;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

503

if (timeout > 0) {

timeout > 0	Description
TRUE	evaluated 8 times by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 308 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition

8-308

504 auto elapsed = t.elapsed(); -

505

if (elapsed > timeout) {

elapsed > timeout	Description
TRUE	evaluated 1 time by 1 test Evaluated by: tst_QReadWriteLock
FALSE	evaluated 7 times by 1 test Evaluated by: tst_QReadWriteLock

1-7

506

if (waitingReaders && !waitingWriters && !writerCount) {

waitingReaders	Description
TRUE	never evaluated
FALSE	evaluated 1 time by 1 test Evaluated by: tst_QReadWriteLock

!waitingWriters	Description
TRUE	never evaluated
FALSE	never evaluated

!writerCount	Description
TRUE	never evaluated
FALSE	never evaluated

0-1

507 // We timed out and now there is no more writers or waiting writers, but some -

508 // readers were queueud (probably because of us). Wake the waiting readers. -

509 readerCond.wakeAll(); -

510

}

never executed: end of block

511

return false;

executed 1 time by 1 test: return false;

Executed by:

tst_QReadWriteLock

512 } -

513 waitingWriters++; -

514 writerCond.wait(&mutex, timeout - elapsed); -

515

} else {

executed 7 times by 1 test: end of block

Executed by:

tst_QReadWriteLock

516 waitingWriters++; -

517 writerCond.wait(&mutex); -

518

}

executed 308 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

308

519 waitingWriters--; -

520

}

executed 315 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

315

521 -

522 Q_ASSERT(writerCount == 0); -

523 Q_ASSERT(readerCount == 0); -

524 writerCount = 1; -

525

return true;

executed 3012 times by 9 tests: return true;

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

3012

526 } -

527 -

528 void QReadWriteLockPrivate::unlock() -

529 { -

530 Q_ASSERT(!mutex.tryLock()); // mutex must be locked when entering this function -

531

if (waitingWriters)

waitingWriters	Description
TRUE	evaluated 2922 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 417 times by 9 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QMetaType tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

417-2922

532

writerCond.wakeOne();

executed 2922 times by 3 tests: writerCond.wakeOne();

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

2922

533

else if (waitingReaders)

waitingReaders	Description
TRUE	evaluated 290 times by 3 tests Evaluated by: tst_QMetaType tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 127 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

127-290

534

readerCond.wakeAll();

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

290

535

}

executed 3339 times by 9 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

3339

536 -

537 bool QReadWriteLockPrivate::recursiveLockForRead(int timeout) -

538 { -

539 Q_ASSERT(recursive); -

540 QMutexLocker lock(&mutex); -

541 -

542 Qt::HANDLE self = QThread::currentThreadId(); -

543 -

544 auto it = currentReaders.find(self); -

545

if (it != currentReaders.end()) {

it != currentReaders.end()	Description
TRUE	evaluated 19 times by 4 tests Evaluated by: tst_QAbstractFileEngine tst_QFile tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 107 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition

19-107

546 ++it.value(); -

547

return true;

executed 19 times by 4 tests: return true;

Executed by:

tst_QAbstractFileEngine
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

548 } -

549 -

550

if (!lockForRead(timeout))

!lockForRead(timeout)	Description
TRUE	evaluated 21 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 86 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition

21-86

551

return false;

executed 21 times by 2 tests: return false;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

552 -

553 currentReaders.insert(self, 1); -

554

return true;

executed 86 times by 5 tests: return true;

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

555 } -

556 -

557 bool QReadWriteLockPrivate::recursiveLockForWrite(int timeout) -

558 { -

559 Q_ASSERT(recursive); -

560 QMutexLocker lock(&mutex); -

561 -

562 Qt::HANDLE self = QThread::currentThreadId(); -

563

if (currentWriter == self) {

currentWriter == self	Description
TRUE	evaluated 12 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 64 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

12-64

564 writerCount++; -

565

return true;

executed 12 times by 2 tests: return true;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

566 } -

567 -

568

if (!lockForWrite(timeout))

!lockForWrite(timeout)	Description
TRUE	evaluated 22 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 42 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

22-42

569

return false;

executed 22 times by 2 tests: return false;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

570 -

571 currentWriter = self; -

572

return true;

executed 42 times by 8 tests: return true;

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

573 } -

574 -

575 void QReadWriteLockPrivate::recursiveUnlock() -

576 { -

577 Q_ASSERT(recursive); -

578 QMutexLocker lock(&mutex); -

579 -

580 Qt::HANDLE self = QThread::currentThreadId(); -

581

if (self == currentWriter) {

self == currentWriter	Description
TRUE	evaluated 54 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status
FALSE	evaluated 105 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition

54-105

582

if (--writerCount > 0)

--writerCount > 0	Description
TRUE	evaluated 12 times by 2 tests Evaluated by: tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 42 times by 8 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition tst_qabstractfileengine - unknown status tst_qdiriterator - unknown status tst_qfile - unknown status

12-42

583

return;

executed 12 times by 2 tests: return;

Executed by:

tst_QReadWriteLock
tst_QWaitCondition

584 currentWriter = 0; -

585

} else {

executed 42 times by 8 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

586 auto it = currentReaders.find(self); -

587

if (it == currentReaders.end()) {

it == currentReaders.end()	Description
TRUE	never evaluated
FALSE	evaluated 105 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition

0-105

588 qWarning("QReadWriteLock::unlock: unlocking from a thread that did not lock"); -

589

return;

never executed: return;

590 } else { -

591

if (--it.value() <= 0) {

--it.value() <= 0	Description
TRUE	evaluated 86 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 19 times by 4 tests Evaluated by: tst_QAbstractFileEngine tst_QFile tst_QReadWriteLock tst_QWaitCondition

19-86

592 currentReaders.erase(it); -

593 readerCount--; -

594

}

executed 86 times by 5 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

595

if (readerCount)

readerCount	Description
TRUE	evaluated 19 times by 4 tests Evaluated by: tst_QAbstractFileEngine tst_QFile tst_QReadWriteLock tst_QWaitCondition
FALSE	evaluated 86 times by 5 tests Evaluated by: tst_QAbstractFileEngine tst_QDirIterator tst_QFile tst_QReadWriteLock tst_QWaitCondition

19-86

596

return;

executed 19 times by 4 tests: return;

Executed by:

tst_QAbstractFileEngine
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

597

}

executed 86 times by 5 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition

598 } -

599 -

600 unlock(); -

601

}

executed 128 times by 8 tests: end of block

Executed by:

tst_QAbstractFileEngine
tst_QDirIterator
tst_QFile
tst_QReadWriteLock
tst_QWaitCondition
tst_qabstractfileengine - unknown status
tst_qdiriterator - unknown status
tst_qfile - unknown status

128

602 -

603 // The freelist management -

604 namespace { -

605 struct FreeListConstants : QFreeListDefaultConstants { -

606 enum { BlockCount = 4, MaxIndex=0xffff }; -

607 static const int Sizes[BlockCount]; -

608 }; -

609 const int FreeListConstants::Sizes[FreeListConstants::BlockCount] = { -

610 16, -

611 128, -

612 1024, -

613 FreeListConstants::MaxIndex - (16 + 128 + 1024) -

614 }; -

615 -

616 typedef QFreeList<QReadWriteLockPrivate, FreeListConstants> FreeList; -

617

Q_GLOBAL_STATIC(FreeList, freelist);

executed 3 times by 3 tests: end of block

Executed by:

tst_qmetatype - unknown status
tst_qreadwritelock - unknown status
tst_qwaitcondition - unknown status

executed 3 times by 3 tests: guard.store(QtGlobalStatic::Destroyed);

Executed by:

tst_qmetatype - unknown status
tst_qreadwritelock - unknown status
tst_qwaitcondition - unknown status

executed 354 times by 3 tests: return &holder.value;

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

guard.load() =...c::Initialized	Description
TRUE	evaluated 3 times by 3 tests Evaluated by: tst_qmetatype - unknown status tst_qreadwritelock - unknown status tst_qwaitcondition - unknown status
FALSE	never evaluated

0-354

618 } -

619 -

620 QReadWriteLockPrivate *QReadWriteLockPrivate::allocate() -

621 { -

622 int i = freelist->next(); -

623 QReadWriteLockPrivate *d = &(*freelist)[i]; -

624 d->id = i; -

625 Q_ASSERT(!d->recursive); -

626 Q_ASSERT(!d->waitingReaders && !d->waitingReaders && !d->readerCount && !d->writerCount); -

627

return d;

executed 118 times by 3 tests: return d;

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

118

628 } -

629 -

630 void QReadWriteLockPrivate::release() -

631 { -

632 Q_ASSERT(!recursive); -

633 Q_ASSERT(!waitingReaders && !waitingReaders && !readerCount && !writerCount); -

634 freelist->release(id); -

635

}

executed 118 times by 3 tests: end of block

Executed by:

tst_QMetaType
tst_QReadWriteLock
tst_QWaitCondition

118

636 -

637 /*! -

638 \class QReadLocker -

639 \inmodule QtCore -

640 \brief The QReadLocker class is a convenience class that -

641 simplifies locking and unlocking read-write locks for read access. -

642 -

643 \threadsafe -

644 -

645 \ingroup thread -

646 -

647 The purpose of QReadLocker (and QWriteLocker) is to simplify -

648 QReadWriteLock locking and unlocking. Locking and unlocking -

649 statements or in exception handling code is error-prone and -

650 difficult to debug. QReadLocker can be used in such situations -

651 to ensure that the state of the lock is always well-defined. -

652 -

653 Here's an example that uses QReadLocker to lock and unlock a -

654 read-write lock for reading: -

655 -

656 \snippet code/src_corelib_thread_qreadwritelock.cpp 1 -

657 -

658 It is equivalent to the following code: -

659 -

660 \snippet code/src_corelib_thread_qreadwritelock.cpp 2 -

661 -

662 The QMutexLocker documentation shows examples where the use of a -

663 locker object greatly simplifies programming. -

664 -

665 \sa QWriteLocker, QReadWriteLock -

666 */ -

667 -

668 /*! -

669 \fn QReadLocker::QReadLocker(QReadWriteLock *lock) -

670 -

671 Constructs a QReadLocker and locks \a lock for reading. The lock -

672 will be unlocked when the QReadLocker is destroyed. If \c lock is -

673 zero, QReadLocker does nothing. -

674 -

675 \sa QReadWriteLock::lockForRead() -

676 */ -

677 -

678 /*! -

679 \fn QReadLocker::~QReadLocker() -

680 -

681 Destroys the QReadLocker and unlocks the lock that was passed to -

682 the constructor. -

683 -

684 \sa QReadWriteLock::unlock() -

685 */ -

686 -

687 /*! -

688 \fn void QReadLocker::unlock() -

689 -

690 Unlocks the lock associated with this locker. -

691 -

692 \sa QReadWriteLock::unlock() -

693 */ -

694 -

695 /*! -

696 \fn void QReadLocker::relock() -

697 -

698 Relocks an unlocked lock. -

699 -

700 \sa unlock() -

701 */ -

702 -

703 /*! -

704 \fn QReadWriteLock *QReadLocker::readWriteLock() const -

705 -

706 Returns a pointer to the read-write lock that was passed -

707 to the constructor. -

708 */ -

709 -

710 /*! -

711 \class QWriteLocker -

712 \inmodule QtCore -

713 \brief The QWriteLocker class is a convenience class that -

714 simplifies locking and unlocking read-write locks for write access. -

715 -

716 \threadsafe -

717 -

718 \ingroup thread -

719 -

720 The purpose of QWriteLocker (and QReadLocker) is to simplify -

721 QReadWriteLock locking and unlocking. Locking and unlocking -

722 statements or in exception handling code is error-prone and -

723 difficult to debug. QWriteLocker can be used in such situations -

724 to ensure that the state of the lock is always well-defined. -

725 -

726 Here's an example that uses QWriteLocker to lock and unlock a -

727 read-write lock for writing: -

728 -

729 \snippet code/src_corelib_thread_qreadwritelock.cpp 3 -

730 -

731 It is equivalent to the following code: -

732 -

733 \snippet code/src_corelib_thread_qreadwritelock.cpp 4 -

734 -

735 The QMutexLocker documentation shows examples where the use of a -

736 locker object greatly simplifies programming. -

737 -

738 \sa QReadLocker, QReadWriteLock -

739 */ -

740 -

741 /*! -

742 \fn QWriteLocker::QWriteLocker(QReadWriteLock *lock) -

743 -

744 Constructs a QWriteLocker and locks \a lock for writing. The lock -

745 will be unlocked when the QWriteLocker is destroyed. If \c lock is -

746 zero, QWriteLocker does nothing. -

747 -

748 \sa QReadWriteLock::lockForWrite() -

749 */ -

750 -

751 /*! -

752 \fn QWriteLocker::~QWriteLocker() -

753 -

754 Destroys the QWriteLocker and unlocks the lock that was passed to -

755 the constructor. -

756 -

757 \sa QReadWriteLock::unlock() -

758 */ -

759 -

760 /*! -

761 \fn void QWriteLocker::unlock() -

762 -

763 Unlocks the lock associated with this locker. -

764 -

765 \sa QReadWriteLock::unlock() -

766 */ -

767 -

768 /*! -

769 \fn void QWriteLocker::relock() -

770 -

771 Relocks an unlocked lock. -

772 -

773 \sa unlock() -

774 */ -

775 -

776 /*! -

777 \fn QReadWriteLock *QWriteLocker::readWriteLock() const -

778 -

779 Returns a pointer to the read-write lock that was passed -

780 to the constructor. -

781 */ -

782 -

783 QT_END_NAMESPACE -

784 -

785 #endif // QT_NO_THREAD -

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