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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * 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.
+ */
+[scriptable, uuid(aa578b44-abd5-4c19-8b14-36d4de6fdc36)]
+interface nsISupportsPriority : nsISupports
+{
+ /**
+ * Typical priority values.
+ */
+ const long PRIORITY_HIGHEST = -20;
+ const long PRIORITY_HIGH = -10;
+ const long PRIORITY_NORMAL = 0;
+ const long PRIORITY_LOW = 10;
+ const long PRIORITY_LOWEST = 20;
+
+ /**
+ * 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.
+ */
+ attribute long priority;
+
+ /**
+ * This method adjusts the priority attribute by a given delta. It helps
+ * reduce the amount of coding required to increment or decrement the value
+ * of the priority attribute.
+ */
+ void adjustPriority(in long delta);
+};