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Depends on D137611 Differential Revision: https://phabricator.services.mozilla.com/D137612
50 lines
1.9 KiB
ReStructuredText
50 lines
1.9 KiB
ReStructuredText
This chapter describes the API for creating and destroying condition
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variables, notifying condition variables of changes in monitored data,
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and making a thread wait on such notification.
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- `Condition Variable Type <#Condition_Variable_Type>`__
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- `Condition Variable Functions <#Condition_Variable_Functions>`__
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Conditions are closely associated with a single monitor, which typically
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consists of a mutex, one or more condition variables, and the monitored
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data. The association between a condition and a monitor is established
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when a condition variable is created, and the association persists for
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its life. In addition, a static association exists between the condition
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and some data within the monitor. This data is what will be manipulated
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by the program under the protection of the monitor.
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A call to :ref:`PR_WaitCondVar` causes a thread to block until a specified
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condition variable receives notification of a change of state in its
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associated monitored data. Other threads may notify the condition
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variable when changes occur.
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For an introduction to NSPR thread synchronization, including locks and
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condition variables, see `Introduction to
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NSPR <Introduction_to_NSPR>`__.
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For reference information on NSPR locks, see
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`Locks <NSPR_API_Reference/Locks>`__.
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NSPR provides a special type, :ref:`PRMonitor`, for use with Java. Unlike a
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mutex of type :ref:`PRLock`, which can have multiple associated condition
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variables of type :ref:`PRCondVar`, a mutex of type :ref:`PRMonitor` has a
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single, implicitly associated condition variable. For information about
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:ref:`PRMonitor`, see `Monitors <Monitors>`__.
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.. _Condition_Variable_Type:
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Condition Variable Type
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-----------------------
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- :ref:`PRCondVar`
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.. _Condition_Variable_Functions:
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Condition Variable Functions
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----------------------------
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- :ref:`PR_NewCondVar`
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- :ref:`PR_DestroyCondVar`
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- :ref:`PR_WaitCondVar`
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- :ref:`PR_NotifyCondVar`
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- :ref:`PR_NotifyAllCondVar`
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