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check preconditions in sched

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rsc 2006-09-07 16:54:00 +00:00
parent e7a5b3c5ee
commit b6cac0a53b
1 changed files with 5 additions and 0 deletions
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5
proc.c
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@ -207,6 +207,11 @@ sched(void)
{ {
struct proc *p = curproc[cpu()]; struct proc *p = curproc[cpu()];
if(!holding(&proc_table_lock))
panic("sched");
if(cpus[cpu()].nlock != 1)
panic("sched locks");
if(setjmp(&p->jmpbuf) == 0) if(setjmp(&p->jmpbuf) == 0)
longjmp(&cpus[cpu()].jmpbuf); longjmp(&cpus[cpu()].jmpbuf);
} }