Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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