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35 lines
1,009 B
ReStructuredText
35 lines
1,009 B
ReStructuredText
PR_CallOnce
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===========
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Ensures that subsystem initialization occurs only once.
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Syntax
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------
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.. code::
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PRStatus PR_CallOnce(
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PRCallOnceType *once,
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PRCallOnceFN func);
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Parameters
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~~~~~~~~~~
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:ref:`PR_CallOnce` has these parameters:
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``once``
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A pointer to an object of type :ref:`PRCallOnceType`. Initially (before
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any threading issues exist), the object must be initialized to all
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zeros. From that time on, the client should consider the object
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read-only (or even opaque) and allow the runtime to manipulate its
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content appropriately.
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``func``
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A pointer to the function the calling client has designed to perform
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the subsystem initialization. The function will be called once, at
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most, for each subsystem to be initialized. It should return a
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:ref:`PRStatus` indicating the result of the initialization process.
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While the first thread executes this function, other threads
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attempting the same initialization will be blocked until it has been
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completed.
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