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Code Issues Releases Activity

Re-activate the nanosleep style using code, but with the signal handling

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semantics of the old sleep for compatability with a few decades of expected
side effects.  Apache breaks if we just use nanosleep() for some reason,
here we use a new signanosleep() syscall which is kinda like a hybrid of
sigsuspend and nanosleep..

Reviewed by:  ache (and tested on his apache that was failing when
                    sleep used plain nanosleep)
This commit is contained in:
Peter Wemm 1997-06-02 16:30:22 +00:00
parent 91097827d5
commit be159dcaf7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=26385
2 changed files with 2 additions and 110 deletions
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54
lib/libc/gen/sleep.c
View File

@ -44,19 +44,10 @@ static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
#endif
#ifndef _THREAD_SAFE
#ifndef USE_NANOSLEEP
#define setvec(vec, a) \
vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
static int ringring;
#endif
static void
sleephandler()
{
#ifndef USE_NANOSLEEP
ringring = 1;
#endif
return;
}
#endif /* _THREAD_SAFE */
@ -78,7 +69,6 @@ sleep(seconds)
}
return (seconds);
#else
#if defined(USE_NANOSLEEP)
struct timespec time_to_sleep;
struct timespec time_remaining;
struct sigaction act, oact;
@ -129,47 +119,5 @@ sleep(seconds)
seconds++; /* round up */
}
return (seconds);
#else
register struct itimerval *itp;
struct itimerval itv, oitv;
struct sigvec vec, ovec;
long omask;
static void sleephandler();
itp = &itv;
if (!seconds)
return 0;
timerclear(&itp->it_interval);
timerclear(&itp->it_value);
if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
return seconds;
itp->it_value.tv_sec = seconds;
if (timerisset(&oitv.it_value)) {
if (timercmp(&oitv.it_value, &itp->it_value, >))
oitv.it_value.tv_sec -= itp->it_value.tv_sec;
else {
itp->it_value = oitv.it_value;
/*
* This is a hack, but we must have time to return
* from the setitimer after the alarm or else it'll
* be restarted. And, anyway, sleep never did
* anything more than this before.
*/
oitv.it_value.tv_sec = 1;
oitv.it_value.tv_usec = 0;
}
}
setvec(vec, sleephandler);
(void) sigvec(SIGALRM, &vec, &ovec);
omask = sigblock(sigmask(SIGALRM));
ringring = 0;
(void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
while (!ringring)
sigpause(omask &~ sigmask(SIGALRM));
(void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
(void) sigsetmask(omask);
(void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
return 0;
#endif /* USE_NANOSLEEP */
#endif /* _THREAD_SAFE */
}

58
lib/libc/gen/usleep.c
View File

@ -43,25 +43,11 @@ static char sccsid[] = "@(#)usleep.c 8.1 (Berkeley) 6/4/93";
#include "pthread_private.h"
#endif
#if !defined(_THREAD_SAFE) && !defined(USE_NANOSLEEP)
#define TICK 10000 /* system clock resolution in microseconds */
#define USPS 1000000 /* number of microseconds in a second */
#endif
#ifndef _THREAD_SAFE
#ifndef USE_NANOSLEEP
#define setvec(vec, a) \
vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
static int ringring;
#endif
static void
sleephandler()
{
#ifndef USE_NANOSLEEP
ringring = 1;
#endif
return;
}
#endif /* _THREAD_SAFE */
@ -84,7 +70,6 @@ usleep(useconds)
time_to_sleep.tv_nsec != 0);
}
#else
#ifdef USE_NANOSLEEP
struct timespec time_to_sleep;
struct timespec time_remaining;
struct sigaction act, oact;
@ -134,46 +119,5 @@ usleep(useconds)
sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
}
}
#else
register struct itimerval *itp;
struct itimerval itv, oitv;
struct sigvec vec, ovec;
long omask;
static void sleephandler();
itp = &itv;
if (!useconds)
return;
timerclear(&itp->it_interval);
timerclear(&itp->it_value);
if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
return;
itp->it_value.tv_sec = useconds / USPS;
itp->it_value.tv_usec = useconds % USPS;
if (timerisset(&oitv.it_value)) {
if (timercmp(&oitv.it_value, &itp->it_value, >)) {
oitv.it_value.tv_sec -= itp->it_value.tv_sec;
oitv.it_value.tv_usec -= itp->it_value.tv_usec;
if (oitv.it_value.tv_usec < 0) {
oitv.it_value.tv_usec += USPS;
oitv.it_value.tv_sec--;
}
} else {
itp->it_value = oitv.it_value;
oitv.it_value.tv_sec = 0;
oitv.it_value.tv_usec = 2 * TICK;
}
}
setvec(vec, sleephandler);
(void) sigvec(SIGALRM, &vec, &ovec);
omask = sigblock(sigmask(SIGALRM));
ringring = 0;
(void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
while (!ringring)
sigpause(omask &~ sigmask(SIGALRM));
(void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
(void) sigsetmask(omask);
(void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
#endif /* USE_NANOSLEEP */
#endif /* _THREAD_SAFE */
}