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Run callouts during infinite waiting inside cv_wait

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During cv_wait we may be waiting for an event triggered by callout.
Run callbacks here to avoid code blocking.

Reviewed by:   hselasky
Submitted by:  Wojciech Macek <wma@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Juniper Networks Inc.
Differential Revision: https://reviews.freebsd.org/D4144
This commit is contained in:
Zbigniew Bodek 2015-11-27 18:19:11 +00:00
parent bbcfaa4eb8
commit 5bb01ba335
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=291403
1 changed files with 9 additions and 0 deletions
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9
sys/boot/kshim/bsd_kernel.c
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@ -138,6 +138,7 @@ cv_timedwait(struct cv *cv, struct mtx *mtx, int timo)
{
int start = ticks;
int delta;
int time = 0;
if (cv->sleeping)
return (EWOULDBLOCK); /* not allowed */
@ -154,6 +155,14 @@ cv_timedwait(struct cv *cv, struct mtx *mtx, int timo)
usb_idle();
if (++time >= (1000000 / hz)) {
time = 0;
callout_process(1);
}
/* Sleep for 1 us */
delay(1);
mtx_lock(mtx);
}