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Table of contents
  1. 1. Syntax
  2. 2. Description
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JSClass.reserveSlots

Table of contents
  1. 1. Syntax
  2. 2. Description

Main Page > SpiderMonkey > JSAPI Reference > JSClass.reserveSlots

The JSClass.reserveSlots callback is called each time a new object is created.

Syntax 

typedef uint32 (*JSReserveSlotsOp)(JSContext *cx, JSObject *obj);
Name Type Description
cx JSContext * The JS context in which the new object is being created.
obj JSObject * The new object.

Description

The optional Class.reserveSlots hook allows a class to make computed per-instance object slots reservations, in addition to or instead of using JSCLASS_HAS_RESERVED_SLOTS(n) in the JSClass.flags initializer to reserve a constant-per-class number of slots. Implementations of this hook should return the number of slots to reserve, not including any reserved by using JSCLASS_HAS_RESERVED_SLOTS(n) in JSClass.flags.

Note: This hook is called with obj locked by the JSObjectOps-specific mutual exclusion mechanism appropriate for obj, so don't nest other operations that might also lock obj.

Page last modified 15:24, 29 Jan 2008 by Jorend

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