diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/s390/lowlevelmutex.c')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/s390/lowlevelmutex.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/lowlevelmutex.c b/nptl/sysdeps/unix/sysv/linux/s390/lowlevelmutex.c new file mode 100644 index 0000000000..3f1889bc77 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/s390/lowlevelmutex.c @@ -0,0 +1,90 @@ +/* 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_mutex_lock (futex, newval) + int *futex; + int newval; +{ + int oldval; + + do + { + lll_futex_wait (futex, newval); + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1"); + } + while (oldval != 0); + + *futex = 2; +} +hidden_proto (___lll_mutex_lock) + + +int +___lll_mutex_timedlock (futex, abstime, newval) + int *futex; + const struct timespec *abstime; + int newval; +{ + /* Reject invalid timeouts. */ + if (abstime->tv_nsec >= 1000000000) + return EINVAL; + + int oldval; + do + { + /* Get the current time. */ + struct timeval tv; + gettimeofday (&tv, NULL); + + /* Compute 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. */ + int err = lll_futex_timed_wait (futex, newval, &rt); + + /* If timed out return with an appropriate error. */ + if (err == -ETIMEDOUT) + return ETIMEDOUT; + + /* XXX oldval in undefined !!! */ + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1"); + } + while (oldval != 0); + + *futex = 2; + + return 0; +} +hidden_proto (___lll_mutex_timedlock) |