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2000-01-08 Mark Kettenis <kettenis@gnu.org>

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* sysdeps/mach/hurd/setitimer.c (quantize_timeval): New function.
	(setitimer_locked): Use it to quantize the timer values.  Use
	quantized timer values to check if the timeout changed.
This commit is contained in:
Mark Kettenis 2000-01-23 10:10:02 +00:00
parent 786731fc3c
commit abf7fd4225
1 changed files with 21 additions and 3 deletions
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24
sysdeps/mach/hurd/setitimer.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
/* Copyright (C) 1994, 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -36,6 +36,22 @@ vm_address_t _hurd_itimer_thread_stack_base; /* Base of its stack. */
vm_address_t _hurd_itimer_thread_stack_size; /* Size of its stack. */
struct timeval _hurd_itimer_started; /* Time the thread started waiting. */
static void
quantize_timeval (struct timeval *tv)
{
static time_t quantum = -1;
if (quantum == -1)
quantum = 1000000 / __libc_clk_tck ();
tv->tv_usec = ((tv->tv_usec + (quantum - 1)) / quantum) * quantum;
if (tv->tv_usec >= 1000000)
{
++tv->tv_sec;
tv->tv_usec -= 1000000;
}
}
static inline void
subtract_timeval (struct timeval *from, const struct timeval *subtract)
{
@ -165,6 +181,8 @@ setitimer_locked (const struct itimerval *new, struct itimerval *old,
}
newval = *new;
quantize_timeval (&newval.it_interval);
quantize_timeval (&newval.it_value);
if ((newval.it_value.tv_sec | newval.it_value.tv_usec) != 0)
{
/* Make sure the itimer thread is set up. */
@ -267,8 +285,8 @@ setitimer_locked (const struct itimerval *new, struct itimerval *old,
}
}
/* See if the timeout changed. If so, we must alert the itimer thread. */
else if (remaining.tv_sec != new->it_value.tv_sec ||
remaining.tv_usec != new->it_value.tv_usec)
else if (remaining.tv_sec != newval.it_value.tv_sec ||
remaining.tv_usec != newval.it_value.tv_usec)
{
/* The timeout value is changing. Tell the itimer thread to
reexamine it and start counting down. If the itimer thread is