[ECOS] Disabling interrupts when locking the scheduler

[Erik Christiansen]

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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