This attribute may be modified to change the priority of this object. The implementation of this interface is free to truncate a given priority value to whatever limits are appropriate. Typically, this attribute is initialized to PRIORITY_NORMAL, but implementations may choose to assign a different initial value.
Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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This interface exposes the general notion of a scheduled object with a integral priority value. Following UNIX conventions, smaller (and possibly negative) values have higher priority.
This interface does not strictly define what happens when the priority of an object is changed. An implementation of this interface is free to define the side-effects of changing the priority of an object. In some cases, changing the priority of an object may be disallowed (resulting in an exception being thrown) or may simply be ignored.