5cb38bc47b
From: Jeff Dike <jdike@addtoit.com> Initialize wall_to_monotonic correctly. This fixes a problem where sleeps lasted about one secone less than they should. This also called for a bit of code restructuring, following a patch which Blaisorblade had been keeping. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <errno.h>
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#include "user_util.h"
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#include "kern_util.h"
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#include "user.h"
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#include "process.h"
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#include "kern_constants.h"
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#include "os.h"
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/* XXX This really needs to be declared and initialized in a kernel file since
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* it's in <linux/time.h>
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*/
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extern struct timespec wall_to_monotonic;
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static void set_interval(int timer_type)
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{
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int usec = 1000000/hz();
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struct itimerval interval = ((struct itimerval) { { 0, usec },
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{ 0, usec } });
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if(setitimer(timer_type, &interval, NULL) == -1)
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panic("setitimer failed - errno = %d\n", errno);
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}
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void enable_timer(void)
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{
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set_interval(ITIMER_VIRTUAL);
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}
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void disable_timer(void)
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{
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struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
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if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
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(setitimer(ITIMER_REAL, &disable, NULL) < 0))
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printk("disnable_timer - setitimer failed, errno = %d\n",
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errno);
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/* If there are signals already queued, after unblocking ignore them */
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set_handler(SIGALRM, SIG_IGN, 0, -1);
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set_handler(SIGVTALRM, SIG_IGN, 0, -1);
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}
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void switch_timers(int to_real)
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{
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struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
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struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
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{ 0, 1000000/hz() }});
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int old, new;
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if(to_real){
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old = ITIMER_VIRTUAL;
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new = ITIMER_REAL;
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}
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else {
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old = ITIMER_REAL;
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new = ITIMER_VIRTUAL;
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}
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if((setitimer(old, &disable, NULL) < 0) ||
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(setitimer(new, &enable, NULL)))
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printk("switch_timers - setitimer failed, errno = %d\n",
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errno);
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}
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void uml_idle_timer(void)
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{
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if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
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panic("Couldn't unset SIGVTALRM handler");
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set_handler(SIGALRM, (__sighandler_t) alarm_handler,
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SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
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set_interval(ITIMER_REAL);
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}
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void time_init(void)
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{
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if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR)
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panic("Couldn't set SIGVTALRM handler");
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set_interval(ITIMER_VIRTUAL);
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time_init_kern();
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}
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unsigned long long os_nsecs(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000);
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}
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void idle_sleep(int secs)
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{
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struct timespec ts;
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ts.tv_sec = secs;
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ts.tv_nsec = 0;
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nanosleep(&ts, NULL);
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}
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/* XXX This partly duplicates init_irq_signals */
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void user_time_init(void)
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{
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set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
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SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
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SIGALRM, SIGUSR2, -1);
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set_handler(SIGALRM, (__sighandler_t) alarm_handler,
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SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
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SIGVTALRM, SIGUSR2, -1);
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set_interval(ITIMER_VIRTUAL);
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}
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