Task API #2
Look great Rob!
I am testing a small extension library which will add considerable
functionality.
New routines are:
task_callbacks(i1,i2): this allows a program or library to register
callback routines in order to be notified before and after task
switching. The callbacks are 0-parameter procedures and use task_self()
to identify the current task. This will simplify saving and restoring
per task non local data. The task API is disabled in these callbacks,
excepting the informational functions task_self(), task_list(), and
task_status().
task_lock(): disables task switching until task_unlock() is issued, the
current task suspends or kills itself, or the current task's procedure
returns.
task_terminate(): sets a flag indicating a desire to terminate the
program while allowing other tasks to complete.
i1=task_terminating(): checks the terminate flag. A task finding this
flag set would normally do final cleanup and then return from its procedure.
task_create(), task_suspend(), task_kill(), task_clock_stop(),
class_clock_start(), and task_yield() are redefined in order to
implement the new functionality.
I will post this to contributions as soon as testing is completed.
Feedback is encouraged. My hope is to develop a standardized library
that can be included in task-safe libraries rather than having every
library writer roll their own--this will allow multiple task-safe libs
to cooperate more effectively as they will be using the same mechanism.
-- Mike Nelson
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