diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c new file mode 100644 index 0000000000..42ed830786 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c @@ -0,0 +1,103 @@ +/* Copyright (C) 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Martin Schwidefsky <schwidefsky@de.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> + + +void +___lll_lock (futex, newval) + int *futex; + int newval; +{ + do + { + int oldval; + + lll_futex_wait (futex, newval); + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,-1"); + } + while (newval != 0); + + *futex = -1; +} +hidden_proto (___lll_lock) + + +/* XXX Should not be in libc.so */ +int +lll_unlock_wake_cb (futex) + int *futex; +{ + int oldval; + int newval; + + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1"); + if (oldval < 0) + lll_futex_wake (futex, 1); + return 0; +} +hidden_proto (lll_unlock_wake_cb) + + +/* XXX Should not be in libc.so */ +int +___lll_timedwait_tid (ptid, abstime) + int *ptid; + const struct timespec *abstime; +{ + int tid; + + if (abstime == NULL || abstime->tv_nsec >= 1000000000) + return EINVAL; + + /* Repeat until thread terminated. */ + while ((tid = *ptid) != 0) + { + /* Get current time. */ + struct timeval tv; + gettimeofday (&tv, NULL); + + /* Determine relative timeout. */ + struct timespec rt; + rt.tv_sec = abstime->tv_sec - tv.tv_sec; + rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; + if (rt.tv_nsec < 0) + { + rt.tv_nsec += 1000000000; + rt.tv_sec--; + } + /* Already timed out? */ + if (rt.tv_sec < 0) + return ETIMEDOUT; + + /* Wait until thread terminates. */ + int err = lll_futex_timed_wait (ptid, tid, &rt); + + /* Woken due to timeout? */ + if (err == -ETIMEDOUT) + /* Yes. */ + return ETIMEDOUT; + } + + return 0; +} + +hidden_proto (___lll_timedwait_tid) |