Subj : Executing 2 scripts in parallel using the same global object
To   : netscape.public.mozilla.jseng
From : "Harizakis Costas" <harizak@speech.gr>
Date : Wed Jun 04 2003 07:57 pm

  I was wondering how can I execute 2 scripts in paraller (using 2 threads),
using the save global object.

  Given the following:

- Create a native thread
- Initialize the runtime and associate it with a context.
- Associate the context with a global object (initializing the common js
classes)
- Declare some functions (as properties of the global object).

  Suppose that a new native thread is created, and wishes to execute one of
the globally -previously- declared functions; Which are the necessary steps
in order to do it safely using the thread-safe build of the js-engine?

  The JS_[Get|Set|Clear]ContextThread() functions as also the
JS_[Begin|End]Request() do not clarify under which circumstances it is safe
to execute 2 scripts concurrently or if deadlocks may arise.

  Will the creation of a 2nd context for the 2nd thread allow me to
reference objects created on the 1st context? Does this imply that the
JS_[Begin|End]Request() calls may be omitted?

  Example:

- The 1st thread is executing a script.
- While in a native function a new thread is created (or an existing one
gets signalled)
- The new thread executes a pre-compiled script (same context).
- Both threads continue executing.
- The 1st thread completes and returns control to the user.
- User continue executing C code.
- The 2nd thread completes sometime later - any results are stored in the js
context.

  Is the above example realizable?
  If yes which thread related JS_xxx() functions should be called and when?

  Thanks in advance,

Costas

.