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fix race condition that can trigger 'enqueue already ready process' panic.

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This commit is contained in:
Ben Gras 2008-12-11 13:42:37 +00:00
parent 567f2f0ba0
commit a74132ec69
1 changed files with 6 additions and 2 deletions
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8
kernel/clock.c
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@ -107,8 +107,12 @@ message *m_ptr; /* pointer to request message */
*/
if (prev_ptr->p_ticks_left <= 0 && priv(prev_ptr)->s_flags & PREEMPTIBLE) {
if(prev_ptr->p_rts_flags == 0) { /* if it was runnable .. */
lock_dequeue(prev_ptr); /* take it off the queues */
lock_enqueue(prev_ptr); /* and reinsert it again */
lock;
{
dequeue(prev_ptr); /* take it off the queues */
enqueue(prev_ptr); /* and reinsert it again */
}
unlock;
} else {
kprintf("CLOCK: %d not runnable; flags: %x\n",
prev_ptr->p_endpoint, prev_ptr->p_rts_flags);