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PR_AtomicSet
============
Atomically sets a 32-bit value and return its previous contents.
Syntax
------
.. code::
#include <pratom.h>
PRInt32 PR_AtomicSet(
PRInt32 *val,
PRInt32 newval);
Parameters
~~~~~~~~~~
The function has the following parameter:
``val``
A pointer to the value to be set.
``newval``
The new value to assign to the ``val`` parameter.
Returns
~~~~~~~
The function returns the prior value of the referenced variable.
Description
-----------
:ref:`PR_AtomicSet` first reads the value of var, then updates it with the
supplied value. The returned value is the value that was read\ *before*
memory was updated. The memory modification is unconditional--that is,
it isn't a test and set operation.
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