CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2023/07/11 01:02:43
Modified files:
sys/kern : kern_sched.c kern_sig.c kern_synch.c
sched_bsd.c
sys/sys : proc.h
Log message:
Rework sleep_setup()/sleep_finish() to no longer hold the scheduler lock
between calls.
Instead of forcing an atomic operation across multiple calls use a three
step transaction.
1. setup sleep state by calling sleep_setup()
2. recheck sleep condition to ensure that the event did not fire before
sleep_setup() registered the proc onto the sleep queue
3. call sleep_finish() to either sleep or keep on running based on the
step 2 outcome and any possible signal delivery
To make this work wakeup from signals, single thread api and wakeup(9) need
to be aware if a process is between step 1 and step 3 so that the process
is not enqueued back onto the runqueue while going to sleep. Introduce
the p_flag P_WSLEEP to detect this situation.
On top of this remove the spl dance in msleep() which is no longer required.
It is ok to process interrupts between step 1 and 3.
OK mpi@ cheloha@
