2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
3 * Licensed under the GPL
11 #include "kern_util.h"
12 #include "kern_constants.h"
16 int set_interval(int is_virtual)
18 int usec = 1000000/hz();
19 int timer_type = is_virtual ? ITIMER_VIRTUAL : ITIMER_REAL;
20 struct itimerval interval = ((struct itimerval) { { 0, usec },
23 if (setitimer(timer_type, &interval, NULL) == -1)
29 void disable_timer(void)
31 struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
33 if ((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
34 (setitimer(ITIMER_REAL, &disable, NULL) < 0))
35 printk(UM_KERN_ERR "disable_timer - setitimer failed, "
36 "errno = %d\n", errno);
38 /* If there are signals already queued, after unblocking ignore them */
39 signal(SIGALRM, SIG_IGN);
40 signal(SIGVTALRM, SIG_IGN);
43 void switch_timers(int to_real)
45 struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
46 struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
47 { 0, 1000000/hz() }});
59 if ((setitimer(old, &disable, NULL) < 0) ||
60 (setitimer(new, &enable, NULL)))
61 printk(UM_KERN_ERR "switch_timers - setitimer failed, "
62 "errno = %d\n", errno);
65 unsigned long long os_nsecs(void)
69 gettimeofday(&tv, NULL);
70 return (unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000;
73 void idle_sleep(int secs)