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+PR_AtomicDecrement
+==================
+
+Atomically decrements a 32-bit value.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <pratom.h>
+
+   PRInt32 PR_AtomicDecrement(PRInt32 *val);
+
+
+Parameter
+~~~~~~~~~
+
+The function has the following parameter:
+
+``val``
+   A pointer to the value to decrement.
+
+
+Returns
+~~~~~~~
+
+The function returns the decremented value (i.e., the result).
+
+
+Description
+-----------
+
+:ref:`PR_AtomicDecrement` first decrements the referenced variable by one.
+The value returned is the referenced variable's final value. The
+modification to memory is unconditional.