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I'd like to propose a change to RTEMS task variables that I think would
make them more useful. I think that it is early enough in their
existence to still make changes to their API.
1) Change type from `int' to `void *'.
2) Add extra argument to task_variable_add -- if non-NULL, a pointer to
a `destructor' function to be called when the task exits. This function
would be called with that task's value of the task variable as its
argument. In many cases, the `dtor' function could be `free'.
rtems_status_code rtems_task_variable_add (
rtems_id tid, void **ptr, void (*dtor)(void *));
rtems_status_code rtems_task_variable_delete (rtems_id tid, void **ptr);
This would be all we'd need to cleanly and efficiently support C++
per-thread exception information without dragging in all that POSIX API
stuff.
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RTEMS API extension to avoid problems when the extension is freed.
Eventually the task variable switch extension should become part
of the core context switch and the Ada tcb self implemented in
terms of it.
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it is now typedef'ed.
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just "rtems_task_variable_t".
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After being submitted, this support was rewritten to be inside the
executive rather than layered on top of it using an extension.
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