0,0 → 1,100 |
/* |
* Copyright (C) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#include <time/clock.h> |
#include <time/timeout.h> |
#include <arch/types.h> |
#include <config.h> |
#include <synch/spinlock.h> |
#include <synch/waitq.h> |
#include <func.h> |
#include <proc/scheduler.h> |
#include <cpu.h> |
#include <print.h> |
#include <arch.h> |
#include <list.h> |
|
#ifdef __SMP__ |
#include <arch/atomic.h> |
#endif |
|
/* |
* Clock is called from an interrupt and is cpu_priority_high()'d. |
*/ |
void clock(void) |
{ |
link_t *l; |
timeout_t *h; |
timeout_handler f; |
void *arg; |
|
/* |
* To avoid lock ordering problems, |
* run all expired timeouts as you visit them. |
*/ |
spinlock_lock(&the->cpu->timeoutlock); |
while ((l = the->cpu->timeout_active_head.next) != &the->cpu->timeout_active_head) { |
h = list_get_instance(l, timeout_t, link); |
spinlock_lock(&h->lock); |
if (h->ticks-- != 0) { |
spinlock_unlock(&h->lock); |
break; |
} |
list_remove(l); |
f = h->handler; |
arg = h->arg; |
timeout_reinitialize(h); |
spinlock_unlock(&h->lock); |
spinlock_unlock(&the->cpu->timeoutlock); |
|
f(arg); |
|
spinlock_lock(&the->cpu->timeoutlock); |
} |
spinlock_unlock(&the->cpu->timeoutlock); |
|
/* |
* Do CPU usage accounting and find out whether to preempt the->thread. |
*/ |
|
if (the->thread) { |
spinlock_lock(&the->cpu->lock); |
the->cpu->needs_relink++; |
spinlock_unlock(&the->cpu->lock); |
|
spinlock_lock(&the->thread->lock); |
if (!the->thread->ticks--) { |
spinlock_unlock(&the->thread->lock); |
scheduler(); |
} |
else { |
spinlock_unlock(&the->thread->lock); |
} |
} |
|
} |