/* * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <sys/time.h> #include <signal.h> #include <errno.h> #include "user_util.h" #include "kern_util.h" #include "user.h" #include "process.h" #include "kern_constants.h" #include "os.h" #include "uml-config.h" int set_interval(int is_virtual) { int usec = 1000000/hz(); int timer_type = is_virtual ? ITIMER_VIRTUAL : ITIMER_REAL; struct itimerval interval = ((struct itimerval) { { 0, usec }, { 0, usec } }); if(setitimer(timer_type, &interval, NULL) == -1) return -errno; return 0; } #ifdef UML_CONFIG_MODE_TT void enable_timer(void) { set_interval(1); } #endif void disable_timer(void) { struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) || (setitimer(ITIMER_REAL, &disable, NULL) < 0)) printk("disnable_timer - setitimer failed, errno = %d\n", errno); /* If there are signals already queued, after unblocking ignore them */ signal(SIGALRM, SIG_IGN); signal(SIGVTALRM, SIG_IGN); } void switch_timers(int to_real) { struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() }, { 0, 1000000/hz() }}); int old, new; if(to_real){ old = ITIMER_VIRTUAL; new = ITIMER_REAL; } else { old = ITIMER_REAL; new = ITIMER_VIRTUAL; } if((setitimer(old, &disable, NULL) < 0) || (setitimer(new, &enable, NULL))) printk("switch_timers - setitimer failed, errno = %d\n", errno); } #ifdef UML_CONFIG_MODE_TT void uml_idle_timer(void) { if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR) panic("Couldn't unset SIGVTALRM handler"); set_handler(SIGALRM, (__sighandler_t) alarm_handler, SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1); set_interval(0); } #endif unsigned long long os_nsecs(void) { struct timeval tv; gettimeofday(&tv, NULL); return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000); } void idle_sleep(int secs) { struct timespec ts; ts.tv_sec = secs; ts.tv_nsec = 0; nanosleep(&ts, NULL); }