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comment about sched() saving/restoring cpu->intena

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This commit is contained in:
Robert Morris 2016-09-02 05:40:54 -04:00
parent 4b2152cc2d
commit bc8221a59c
2 changed files with 8 additions and 2 deletions
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7
proc.c
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@ -302,7 +302,12 @@ scheduler(void)
} }
// Enter scheduler. Must hold only ptable.lock // Enter scheduler. Must hold only ptable.lock
// and have changed proc->state. // and have changed proc->state. Saves and restores
// intena because intena is a property of this
// kernel thread, not this CPU. It should
// be proc->intena and proc->ncli, but that would
// break in the few places where a lock is held but
// there's no process.
void void
sched(void) sched(void)
{ {

3
spinlock.c
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@ -102,8 +102,9 @@ pushcli(void)
eflags = readeflags(); eflags = readeflags();
cli(); cli();
if(cpu->ncli++ == 0) if(cpu->ncli == 0)
cpu->intena = eflags & FL_IF; cpu->intena = eflags & FL_IF;
cpu->ncli += 1;
} }
void void