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/* low level locking for pthread library. Generic futex-using version.
Copyright (C) 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <sys/time.h>
void
__lll_lock_wait (int *futex, int val)
{
do {
lll_futex_wait (futex, val+1);
} while ((val = __lll_add (futex, 1)) != 0);
*futex = 2;
}
hidden_proto (__lll_lock_wait)
int
__lll_timedlock_wait (int *futex, int val, const struct timespec *abstime)
{
int err;
/* Reject invalid timeouts. */
if (abstime->tv_nsec >= 1000000000)
return EINVAL;
do
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
err = -ETIMEDOUT;
if (sec < 0)
break;
/* Wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
err = lll_futex_timed_wait (futex, val+1, &rt);
} while (err == 0 && (val = __lll_add (futex, 1)) != 0);
*futex = 2;
return -err;
}
hidden_proto (__lll_timedlock_wait)
/* These don't get included in libc.so */
#ifdef IS_IN_libpthread
int
lll_unlock_wake_cb (int *futex)
{
__lll_add (futex, 1);
return 0;
}
hidden_proto (lll_unlock_wake_cb)
int
__lll_timedwait_tid (int *tidp, const struct timespec *abstime)
{
int tid;
int err = 0;
if (abstime == NULL || abstime->tv_nsec >= 1000000000)
return EINVAL;
/* Repeat until thread terminated. */
while ((tid = *tidp) != 0)
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
err = -ETIMEDOUT;
if (sec < 0)
break;
/* Wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
/* Wait until thread terminates. */
err = lll_futex_timed_wait (tidp, tid, &rt);
if (err != 0)
break;
}
return -err;
}
hidden_proto (__lll_timedwait_tid)
#endif
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