diff options
Diffstat (limited to 'libc/nptl/pthread_mutex_getprioceiling.c')
-rw-r--r-- | libc/nptl/pthread_mutex_getprioceiling.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libc/nptl/pthread_mutex_getprioceiling.c b/libc/nptl/pthread_mutex_getprioceiling.c new file mode 100644 index 000000000..1ce5eaebe --- /dev/null +++ b/libc/nptl/pthread_mutex_getprioceiling.c @@ -0,0 +1,38 @@ +/* Get current priority ceiling of pthread_mutex_t. + Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. + + 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 <pthreadP.h> + + +int +pthread_mutex_getprioceiling (mutex, prioceiling) + const pthread_mutex_t *mutex; + int *prioceiling; +{ + if (__builtin_expect ((mutex->__data.__kind + & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0)) + return EINVAL; + + *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK) + >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT; + + return 0; +} |