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Depends on D137611 Differential Revision: https://phabricator.services.mozilla.com/D137612
42 lines
1.5 KiB
ReStructuredText
42 lines
1.5 KiB
ReStructuredText
This chapter describes the NSPR API for creation and manipulation of a
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mutex of type :ref:`PRLock`.
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- `Lock Type <#Lock_Type>`__
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- `Lock Functions <#Lock_Functions>`__
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In NSPR, a mutex of type :ref:`PRLock` controls locking, and associated
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condition variables communicate changes in state among threads. When a
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programmer associates a mutex with an arbitrary collection of data, the
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mutex provides a protective monitor around the data.
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In general, a monitor is a conceptual entity composed of a mutex, one or
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more condition variables, and the monitored data. Monitors in this
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generic sense should not be confused with monitors used in Java
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programming. In addition to :ref:`PRLock`, NSPR provides another mutex
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type, :ref:`PRMonitor`, which is reentrant and can have only one associated
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condition variable. :ref:`PRMonitor` is intended for use with Java and
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reflects the Java approach to thread synchronization.
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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 condition variables, see `Condition
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Variables <Condition_Variables>`__.
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.. _Lock_Type:
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Lock Type
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---------
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- :ref:`PRLock`
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.. _Lock_Functions:
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Lock Functions
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--------------
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- :ref:`PR_NewLock` creates a new lock object.
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- :ref:`PR_DestroyLock` destroys a specified lock object.
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- :ref:`PR_Lock` locks a specified lock object.
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- :ref:`PR_Unlock` unlocks a specified lock object.
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