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Disabling interrupts when locking the scheduler
- From: Erik Christiansen <erik at dd dot nec dot com dot au>
- To: ecos-discuss at ecos dot sourceware dot org
- Date: Fri, 3 Jun 2005 18:46:44 +1000
- Subject: [ECOS] Disabling interrupts when locking the scheduler
The possibility of disabling interrupts when locking the scheduler seems
built into the calling sequence:
Cyg_Scheduler::lock() <-- Generates no code, anywhere. *1
inc_sched_lock()
HAL_SMP_SCHEDLOCK_INC
HAL_DISABLE_INTERRUPTS <-- Disables interrupts, if invoked.
While ref/kernel-interrupts.html confirms that interrupts are normally not
disabled, for improved interrupt latency, the code is there, if I can just
figure out how to turn it on. It's not conditionals, but seems to be
inheritance which causes Cyg_Scheduler::lock() to be excluded.
Has anyone tried this before?
(I'd prefer to enable the latent code, rather than just poke a
HAL_DISABLE_INTERRUPTS in front of Cyg_Scheduler::lock() in 66
places, and repeat for enabling.)
*1) No timeslicing, CYGSEM_HAL_USE_ROM_MONITOR == 1.
Erik
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