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Diffstat (limited to 'kernel/itimer.c')
-rw-r--r--kernel/itimer.c176
1 files changed, 119 insertions, 57 deletions
diff --git a/kernel/itimer.c b/kernel/itimer.c
index c9cc2a4cb40a..e9a40e947e07 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/syscalls.h>
#include <linux/time.h>
+#include <linux/posix-timers.h>
#include <asm/uaccess.h>
@@ -29,24 +30,67 @@ static unsigned long it_real_value(struct signal_struct *sig)
int do_getitimer(int which, struct itimerval *value)
{
+ struct task_struct *tsk = current;
unsigned long interval, val;
+ cputime_t cinterval, cval;
switch (which) {
case ITIMER_REAL:
- spin_lock_irq(&current->sighand->siglock);
- interval = current->signal->it_real_incr;
- val = it_real_value(current->signal);
- spin_unlock_irq(&current->sighand->siglock);
+ spin_lock_irq(&tsk->sighand->siglock);
+ interval = tsk->signal->it_real_incr;
+ val = it_real_value(tsk->signal);
+ spin_unlock_irq(&tsk->sighand->siglock);
jiffies_to_timeval(val, &value->it_value);
jiffies_to_timeval(interval, &value->it_interval);
break;
case ITIMER_VIRTUAL:
- cputime_to_timeval(current->it_virt_value, &value->it_value);
- cputime_to_timeval(current->it_virt_incr, &value->it_interval);
+ read_lock(&tasklist_lock);
+ spin_lock_irq(&tsk->sighand->siglock);
+ cval = tsk->signal->it_virt_expires;
+ cinterval = tsk->signal->it_virt_incr;
+ if (!cputime_eq(cval, cputime_zero)) {
+ struct task_struct *t = tsk;
+ cputime_t utime = tsk->signal->utime;
+ do {
+ utime = cputime_add(utime, t->utime);
+ t = next_thread(t);
+ } while (t != tsk);
+ if (cputime_le(cval, utime)) { /* about to fire */
+ cval = jiffies_to_cputime(1);
+ } else {
+ cval = cputime_sub(cval, utime);
+ }
+ }
+ spin_unlock_irq(&tsk->sighand->siglock);
+ read_unlock(&tasklist_lock);
+ cputime_to_timeval(cval, &value->it_value);
+ cputime_to_timeval(cinterval, &value->it_interval);
break;
case ITIMER_PROF:
- cputime_to_timeval(current->it_prof_value, &value->it_value);
- cputime_to_timeval(current->it_prof_incr, &value->it_interval);
+ read_lock(&tasklist_lock);
+ spin_lock_irq(&tsk->sighand->siglock);
+ cval = tsk->signal->it_prof_expires;
+ cinterval = tsk->signal->it_prof_incr;
+ if (!cputime_eq(cval, cputime_zero)) {
+ struct task_struct *t = tsk;
+ cputime_t ptime = cputime_add(tsk->signal->utime,
+ tsk->signal->stime);
+ do {
+ ptime = cputime_add(ptime,
+ cputime_add(t->utime,
+ t->stime));
+ t = next_thread(t);
+ } while (t != tsk);
+ if (cputime_le(cval, ptime)) { /* about to fire */
+ cval = jiffies_to_cputime(1);
+ } else {
+ cval = cputime_sub(cval, ptime);
+ }
+ }
+ spin_unlock_irq(&tsk->sighand->siglock);
+ read_unlock(&tasklist_lock);
+ cputime_to_timeval(cval, &value->it_value);
+ cputime_to_timeval(cinterval, &value->it_interval);
break;
default:
return(-EINVAL);
@@ -101,57 +145,75 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
struct task_struct *tsk = current;
unsigned long val, interval;
- cputime_t cputime;
+ cputime_t cval, cinterval, nval, ninterval;
switch (which) {
- case ITIMER_REAL:
- spin_lock_irq(&tsk->sighand->siglock);
- interval = tsk->signal->it_real_incr;
- val = it_real_value(tsk->signal);
- if (val)
- del_timer_sync(&tsk->signal->real_timer);
- tsk->signal->it_real_incr =
- timeval_to_jiffies(&value->it_interval);
- it_real_arm(tsk, timeval_to_jiffies(&value->it_value));
- spin_unlock_irq(&tsk->sighand->siglock);
- if (ovalue) {
- jiffies_to_timeval(val, &ovalue->it_value);
- jiffies_to_timeval(interval,
- &ovalue->it_interval);
- }
- break;
- case ITIMER_VIRTUAL:
- if (ovalue) {
- cputime_to_timeval(tsk->it_virt_value,
- &ovalue->it_value);
- cputime_to_timeval(tsk->it_virt_incr,
- &ovalue->it_interval);
- }
- cputime = timeval_to_cputime(&value->it_value);
- if (cputime_gt(cputime, cputime_zero))
- cputime = cputime_add(cputime,
- jiffies_to_cputime(1));
- tsk->it_virt_value = cputime;
- cputime = timeval_to_cputime(&value->it_interval);
- tsk->it_virt_incr = cputime;
- break;
- case ITIMER_PROF:
- if (ovalue) {
- cputime_to_timeval(tsk->it_prof_value,
- &ovalue->it_value);
- cputime_to_timeval(tsk->it_prof_incr,
- &ovalue->it_interval);
- }
- cputime = timeval_to_cputime(&value->it_value);
- if (cputime_gt(cputime, cputime_zero))
- cputime = cputime_add(cputime,
- jiffies_to_cputime(1));
- tsk->it_prof_value = cputime;
- cputime = timeval_to_cputime(&value->it_interval);
- tsk->it_prof_incr = cputime;
- break;
- default:
- return -EINVAL;
+ case ITIMER_REAL:
+ spin_lock_irq(&tsk->sighand->siglock);
+ interval = tsk->signal->it_real_incr;
+ val = it_real_value(tsk->signal);
+ if (val)
+ del_timer_sync(&tsk->signal->real_timer);
+ tsk->signal->it_real_incr =
+ timeval_to_jiffies(&value->it_interval);
+ it_real_arm(tsk, timeval_to_jiffies(&value->it_value));
+ spin_unlock_irq(&tsk->sighand->siglock);
+ if (ovalue) {
+ jiffies_to_timeval(val, &ovalue->it_value);
+ jiffies_to_timeval(interval,
+ &ovalue->it_interval);
+ }
+ break;
+ case ITIMER_VIRTUAL:
+ nval = timeval_to_cputime(&value->it_value);
+ ninterval = timeval_to_cputime(&value->it_interval);
+ read_lock(&tasklist_lock);
+ spin_lock_irq(&tsk->sighand->siglock);
+ cval = tsk->signal->it_virt_expires;
+ cinterval = tsk->signal->it_virt_incr;
+ if (!cputime_eq(cval, cputime_zero) ||
+ !cputime_eq(nval, cputime_zero)) {
+ if (cputime_gt(nval, cputime_zero))
+ nval = cputime_add(nval,
+ jiffies_to_cputime(1));
+ set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
+ &nval, &cval);
+ }
+ tsk->signal->it_virt_expires = nval;
+ tsk->signal->it_virt_incr = ninterval;
+ spin_unlock_irq(&tsk->sighand->siglock);
+ read_unlock(&tasklist_lock);
+ if (ovalue) {
+ cputime_to_timeval(cval, &ovalue->it_value);
+ cputime_to_timeval(cinterval, &ovalue->it_interval);
+ }
+ break;
+ case ITIMER_PROF:
+ nval = timeval_to_cputime(&value->it_value);
+ ninterval = timeval_to_cputime(&value->it_interval);
+ read_lock(&tasklist_lock);
+ spin_lock_irq(&tsk->sighand->siglock);
+ cval = tsk->signal->it_prof_expires;
+ cinterval = tsk->signal->it_prof_incr;
+ if (!cputime_eq(cval, cputime_zero) ||
+ !cputime_eq(nval, cputime_zero)) {
+ if (cputime_gt(nval, cputime_zero))
+ nval = cputime_add(nval,
+ jiffies_to_cputime(1));
+ set_process_cpu_timer(tsk, CPUCLOCK_PROF,
+ &nval, &cval);
+ }
+ tsk->signal->it_prof_expires = nval;
+ tsk->signal->it_prof_incr = ninterval;
+ spin_unlock_irq(&tsk->sighand->siglock);
+ read_unlock(&tasklist_lock);
+ if (ovalue) {
+ cputime_to_timeval(cval, &ovalue->it_value);
+ cputime_to_timeval(cinterval, &ovalue->it_interval);
+ }
+ break;
+ default:
+ return -EINVAL;
}
return 0;
}
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