diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/s390/sem_timedwait.c')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/s390/sem_timedwait.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/sem_timedwait.c b/nptl/sysdeps/unix/sysv/linux/s390/sem_timedwait.c new file mode 100644 index 0000000000..7236842612 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/s390/sem_timedwait.c @@ -0,0 +1,88 @@ +/* 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 <lowlevelsem.h> +#include <internaltypes.h> + +#include <shlib-compat.h> + + +int +sem_timedwait (sem, abstime) + sem_t *sem; + const struct timespec *abstime; +{ + int oldval, newval; + + while (1) + { + /* Atomically decrement semaphore counter if it is > 0. */ + lll_compare_and_swap ((int *) sem, oldval, newval, + "ltr %2,%1; jnp 1f; ahi %2,-1"); + /* oldval != newval if the semaphore count has been decremented. */ + if (oldval != newval) + return 0; + + /* Check for invalid timeout values. */ + if (abstime->tv_nsec >= 1000000000) + { + __set_errno(EINVAL); + return -1; + } + + /* Get the current time. */ + struct timeval tv; + gettimeofday(&tv, NULL); + + /* Compute the 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) + { + __set_errno(ETIMEDOUT); + return -1; + } + + /* Do wait. */ + int err = lll_futex_timed_wait ((int *) sem, 0, &rt); + + /* Returned after timing out? */ + if (err == -ETIMEDOUT) + { + __set_errno (ETIMEDOUT); + return -1; + } + + /* Handle EINTR. */ + if (err != 0 && err != -EWOULDBLOCK) + { + __set_errno (-err); + return -1; + } + } +} |