1a80521990
There are various uses of powers of 1000, plus the odd BILLION constant in the time code. However, there are perfectly good definitions of *SEC_PER_*SEC in linux/time.h which can be used instaed. These are replaced directly in kernel code. Userspace code imports those constants as UM_*SEC_PER_*SEC and uses these. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <errno.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include "kern_constants.h"
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#include "os.h"
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#include "user.h"
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int set_interval(void)
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{
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int usec = UM_USEC_PER_SEC / UM_HZ;
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struct itimerval interval = ((struct itimerval) { { 0, usec },
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{ 0, usec } });
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if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
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return -errno;
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return 0;
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}
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int timer_one_shot(int ticks)
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{
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unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ;
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unsigned long sec = usec / UM_USEC_PER_SEC;
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struct itimerval interval;
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usec %= UM_USEC_PER_SEC;
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interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });
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if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
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return -errno;
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return 0;
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}
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/**
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* timeval_to_ns - Convert timeval to nanoseconds
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* @ts: pointer to the timeval variable to be converted
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*
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* Returns the scalar nanosecond representation of the timeval
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* parameter.
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*
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* Ripped from linux/time.h because it's a kernel header, and thus
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* unusable from here.
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*/
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static inline long long timeval_to_ns(const struct timeval *tv)
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{
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return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
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tv->tv_usec * UM_NSEC_PER_USEC;
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}
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long long disable_timer(void)
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{
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struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } });
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if(setitimer(ITIMER_VIRTUAL, &time, &time) < 0)
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printk(UM_KERN_ERR "disable_timer - setitimer failed, "
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"errno = %d\n", errno);
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return timeval_to_ns(&time.it_value);
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}
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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 timeval_to_ns(&tv);
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}
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extern void alarm_handler(int sig, struct sigcontext *sc);
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void idle_sleep(unsigned long long nsecs)
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{
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struct timespec ts = { .tv_sec = nsecs / UM_NSEC_PER_SEC,
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.tv_nsec = nsecs % UM_NSEC_PER_SEC };
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if (nanosleep(&ts, &ts) == 0)
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alarm_handler(SIGVTALRM, NULL);
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}
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