# QReadWriteLock Class Reference
## [[QtCore](index.htm) module]
該QReadWriteLock類提供的讀寫鎖。[More...](#details)
### Types
* `enum RecursionMode { NonRecursive, Recursive }`
### Methods
* `__init__ (self)`
* `__init__ (self, RecursionMode?recursionMode)`
* `lockForRead (self)`
* `lockForWrite (self)`
* `bool tryLockForRead (self)`
* `bool tryLockForRead (self, int?timeout)`
* `bool tryLockForWrite (self)`
* `bool tryLockForWrite (self, int?timeout)`
* `unlock (self)`
* * *
## Detailed Description
該QReadWriteLock類提供的讀寫鎖。
讀寫鎖是一個同步工具，用于保護可用于讀取和寫入訪問的資源。如果你想允許多個線程同時有只讀訪問這個類型的鎖是有用的，但只要有一個線程要寫入的資源，所有其它線程必須被阻止，直到寫入完成。
在許多情況下， QReadWriteLock是一個直接競爭者[QMutex](qmutex.html)。 QReadWriteLock是一個不錯的選擇，如果有許多并發讀取和寫入發生很少。
例如：
```
QReadWriteLock lock;
void ReaderThread.run()
{
...
lock.lockForRead();
read_file();
lock.unlock();
...
}
void WriterThread.run()
{
...
lock.lockForWrite();
write_file();
lock.unlock();
...
}
```
以確保作家不是由讀者永遠阻塞，讀者試圖獲取鎖不會如果有阻塞作家等待訪問，即使鎖定目前僅由其它讀者訪問成功。此外，如果該鎖由一個作家訪問和另一位作家進來，那筆者將優先于該也可能會等待任何讀者。
喜歡[QMutex](qmutex.html)，一個QReadWriteLock可以在構建時被遞歸鎖定由同一個線程[QReadWriteLock.RecursionMode](qreadwritelock.html#RecursionMode-enum)。在這種情況下，[unlock](qreadwritelock.html#unlock)（ ）必須被調用的次數相同[lockForWrite](qreadwritelock.html#lockForWrite)（）或[lockForRead](qreadwritelock.html#lockForRead)（ ）被調用。需要注意的是試圖以遞歸方式鎖定，也就是說，它是不可能的讀鎖，在已經鎖定寫（反之亦然）一個線程，當鎖定類型不能改變。
* * *
## Type Documentation
```
QReadWriteLock.RecursionMode
```
| Constant | Value | Description |
| --- | --- | --- |
| `QReadWriteLock.Recursive` | `1` | 在這種模式下，一個線程可以鎖定同一[QReadWriteLock](qreadwritelock.html)多次與互斥不會被解鎖，直到相應數量的[unlock](qreadwritelock.html#unlock)（ ）的調用而制定的。 |
| `QReadWriteLock.NonRecursive` | `0` | 在這種模式下，一個線程可能僅鎖定[QReadWriteLock](qreadwritelock.html)一次。 |
這個枚舉被引入或修改的Qt 4.4 。
**See also** [QReadWriteLock](qreadwritelock.html#QReadWriteLock)（ ） 。
* * *
## Method Documentation
```
QReadWriteLock.__init__ (self)
```
構造一個[QReadWriteLock](qreadwritelock.html)在對象[NonRecursive](qreadwritelock.html#RecursionMode-enum)模式。
**See also** [lockForRead](qreadwritelock.html#lockForRead)（）和[lockForWrite](qreadwritelock.html#lockForWrite)（ ） 。
```
QReadWriteLock.__init__ (self, RecursionMode?recursionMode)
```
構造一個[QReadWriteLock](qreadwritelock.html)在給定的對象_recursionMode_。
此功能被引入Qt的4.4 。
**See also** [lockForRead](qreadwritelock.html#lockForRead)（ ）[lockForWrite](qreadwritelock.html#lockForWrite)（）和[RecursionMode](qreadwritelock.html#RecursionMode-enum)。
```
QReadWriteLock.lockForRead (self)
```
鎖讀鎖。此函數將阻塞當前線程，如果任何線程（包括當前）已鎖定用于寫入。
**See also** [unlock](qreadwritelock.html#unlock)（ ）[lockForWrite](qreadwritelock.html#lockForWrite)（）和[tryLockForRead](qreadwritelock.html#tryLockForRead)（ ） 。
```
QReadWriteLock.lockForWrite (self)
```
鎖寫鎖。此函數將阻塞當前線程，如果另一個線程已鎖定讀取或寫入。
**See also** [unlock](qreadwritelock.html#unlock)（ ）[lockForRead](qreadwritelock.html#lockForRead)（）和[tryLockForWrite](qreadwritelock.html#tryLockForWrite)（ ） 。
```
bool QReadWriteLock.tryLockForRead (self)
```
嘗試讀鎖。如果獲得了鎖，這個函數返回True ，否則返回，而不是等待該鎖虛假變得可用，也就是說，它不會阻塞。
如果另一個線程已鎖定用于寫入的鎖定嘗試將會失敗。
如果獲得了鎖，該鎖必須被解鎖[unlock](qreadwritelock.html#unlock)（ ）之前，另一個線程可以成功地將其鎖定。
**See also** [unlock](qreadwritelock.html#unlock)（）和[lockForRead](qreadwritelock.html#lockForRead)（ ） 。
```
bool QReadWriteLock.tryLockForRead (self, int?timeout)
```
這是一個重載函數。
嘗試讀鎖。如果獲得了鎖這個函數返回True，否則返回False 。如果另一個線程已鎖定的文筆，這個函數將等待最多_timeout_毫秒為鎖變得可用。
注意：傳遞一個負數作為_timeout_相當于調用[lockForRead](qreadwritelock.html#lockForRead)（ ） ，即該函數將一直等待，直到鎖可以鎖定讀數時_timeout_是負的。
如果獲得了鎖，該鎖必須被解鎖[unlock](qreadwritelock.html#unlock)（ ）之前，另一個線程可以成功地將其鎖定。
**See also** [unlock](qreadwritelock.html#unlock)（）和[lockForRead](qreadwritelock.html#lockForRead)（ ） 。
```
bool QReadWriteLock.tryLockForWrite (self)
```
嘗試寫鎖。如果獲得了鎖，則該函數返回True，否則，它會立即返回False 。
如果另一個線程已鎖定用于讀取或寫入鎖定的嘗試將會失敗。
如果獲得了鎖，該鎖必須被解鎖[unlock](qreadwritelock.html#unlock)（ ）之前，另一個線程可以成功地將其鎖定。
**See also** [unlock](qreadwritelock.html#unlock)（）和[lockForWrite](qreadwritelock.html#lockForWrite)（ ） 。
```
bool QReadWriteLock.tryLockForWrite (self, int?timeout)
```
這是一個重載函數。
嘗試寫鎖。如果獲得了鎖這個函數返回True，否則返回False 。如果另一個線程已鎖定用于讀取或寫入時，此功能會等待最多_timeout_毫秒為鎖變得可用。
注意：傳遞一個負數作為_timeout_相當于調用[lockForWrite](qreadwritelock.html#lockForWrite)（ ） ，即該函數將一直等待，直到鎖可以鎖定寫入時_timeout_是負的。
如果獲得了鎖，該鎖必須被解鎖[unlock](qreadwritelock.html#unlock)（ ）之前，另一個線程可以成功地將其鎖定。
**See also** [unlock](qreadwritelock.html#unlock)（）和[lockForWrite](qreadwritelock.html#lockForWrite)（ ） 。
```
QReadWriteLock.unlock (self)
```
解除鎖定。
試圖解鎖未鎖定的鎖是一個錯誤，將導致程序終止。
**See also** [lockForRead](qreadwritelock.html#lockForRead)（ ）[lockForWrite](qreadwritelock.html#lockForWrite)（ ）[tryLockForRead](qreadwritelock.html#tryLockForRead)（）和[tryLockForWrite](qreadwritelock.html#tryLockForWrite)（ ） 。
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- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference