nsISupportsPriority 编辑

xpcom/threads/nsISupportsPriority.idlScriptable This interface exposes the general notion of a scheduled object with an integral priority value. Following UNIX conventions, smaller (and possibly negative) values have higher priority. 1.0 66 Introduced Gecko 1.8 Inherits from: nsISupports Last changed in Gecko 1.8 (Firefox 1.5 / Thunderbird 1.5 / SeaMonkey 1.0)

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.

Method overview

void adjustPriority(in long delta);

Attributes

Attribute	Type	Description
priority	long	The object's priority. It can be modified to change the priority of the object. Typical priority values are defined in the idl file as PRIORITY_HIGHEST ... PRIORITY_LOWEST. The implementation 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.

Constants

Constant	Value	Description
PRIORITY_HIGHEST	-20	The highest priority.
PRIORITY_HIGH	-10	Higher than normal priority.
PRIORITY_NORMAL	0	The default priority.
PRIORITY_LOW	10	Lower than normal priority.
PRIORITY_LOWEST	20	The lowest priority.

Methods

adjustPriority()

This method adjusts the priority attribute by a given amount (delta).

void adjustPriority(
  in long delta
);

Parameters

delta

The amount by which to adjust the priority attribute.

See also

• Changing the Priority of HTTP Requests for an example of using this interface to adjust the priority of an HTTP request.