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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. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or 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. */ vm_address_t _hurd_itimer_thread_stack_size; /* Size of its stack. */
struct timeval _hurd_itimer_started; /* Time the thread started waiting. */ 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 static inline void
subtract_timeval (struct timeval *from, const struct timeval *subtract) subtract_timeval (struct timeval *from, const struct timeval *subtract)
{ {
@ -165,6 +181,8 @@ setitimer_locked (const struct itimerval *new, struct itimerval *old,
} }
newval = *new; newval = *new;
quantize_timeval (&newval.it_interval);
quantize_timeval (&newval.it_value);
if ((newval.it_value.tv_sec | newval.it_value.tv_usec) != 0) if ((newval.it_value.tv_sec | newval.it_value.tv_usec) != 0)
{ {
/* Make sure the itimer thread is set up. */ /* 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. */ /* See if the timeout changed. If so, we must alert the itimer thread. */
else if (remaining.tv_sec != new->it_value.tv_sec || else if (remaining.tv_sec != newval.it_value.tv_sec ||
remaining.tv_usec != new->it_value.tv_usec) remaining.tv_usec != newval.it_value.tv_usec)
{ {
/* The timeout value is changing. Tell the itimer thread to /* The timeout value is changing. Tell the itimer thread to
reexamine it and start counting down. If the itimer thread is reexamine it and start counting down. If the itimer thread is