Class: QgsReadWriteLocker¶
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class
qgis.core.
QgsReadWriteLocker
(lock: QReadWriteLock, mode: QgsReadWriteLocker.Mode)¶ Bases:
sip.wrapper
Create a new QgsReadWriteLocker for
lock
and initialize inmode
.QgsReadWriteLocker(QgsReadWriteLocker)
The QgsReadWriteLocker class is a convenience class that simplifies locking and unlocking QReadWriteLocks.
Locking and unlocking a QReadWriteLocks in complex functions and statements or in exception handling code is error-prone and difficult to debug. QgsReadWriteLocker can be used in such situations to ensure that the state of the lock is always well-defined.
QgsReadWriteLocker should be created within a function where a QReadWriteLock needs to be locked. The lock may be locked when QgsReadWriteLocker is created or when changeMode is called. You can unlock and relock the lock with unlock() and changeMode(). If locked, the lock will be unlocked when the QgsReadWriteLocker is destroyed.
New in version 3.4: Enums
Methods
Change the mode of the lock to
mode
.Unlocks the lock.
Signals
Attributes
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class
Mode
¶ Bases:
int
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Read
= 0¶
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Unlocked
= 2¶
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Write
= 1¶
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changeMode
(self, mode: QgsReadWriteLocker.Mode)¶ Change the mode of the lock to
mode
. The lock will be unlocked and relocked as required.
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unlock
(self)¶ Unlocks the lock. Equivalent to doing
changeMode( QgsReadWriteLocker.Unlock );
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class