d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Protect p_wmesg and p_wchan with sched_lock while checking for deadlocks

Browse Source 
with other byte range file locks.
This commit is contained in:
John Baldwin 2001-03-24 03:57:44 +00:00
parent 386deae89c
commit 8d2725181a
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/kern/kern_lockf.c
View File

@ -234,6 +234,7 @@ lf_setlock(lock)
/* The block is waiting on something */
wproc = (struct proc *)block->lf_id;
mtx_lock_spin(&sched_lock);
while (wproc->p_wchan &&
(wproc->p_wmesg == lockstr) &&
(i++ < maxlockdepth)) {
@ -244,10 +245,12 @@ lf_setlock(lock)
break;
wproc = (struct proc *)waitblock->lf_id;
if (wproc == (struct proc *)lock->lf_id) {
mtx_unlock_spin(&sched_lock);
free(lock, M_LOCKF);
return (EDEADLK);
}
}
mtx_unlock_spin(&sched_lock);
}
/*
* For flock type locks, we must first remove