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authorRoland McGrath <roland@gnu.org>2006-02-28 09:57:07 +0000
committerRoland McGrath <roland@gnu.org>2006-02-28 09:57:07 +0000
commita5f2bd861c4c84ac66164951a7f32e1d6f57849c (patch)
tree513c87adf7cf9e919713fc3e0f55959a6b2f6d3b /nptl/pthread_mutex_setprioceiling.c
parent8d2e6a0383b6958311f021ee0b8b7eba44110f5a (diff)
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* elf/rtld-Rules (subdir-args): New variable.
(rtld-subdir-make): Use it.
Diffstat (limited to 'nptl/pthread_mutex_setprioceiling.c')
-rw-r--r--nptl/pthread_mutex_setprioceiling.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/nptl/pthread_mutex_setprioceiling.c b/nptl/pthread_mutex_setprioceiling.c
new file mode 100644
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+++ b/nptl/pthread_mutex_setprioceiling.c
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+/* Set 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_setprioceiling (mutex, prioceiling, old_ceiling)
+ pthread_mutex_t *mutex;
+ int prioceiling;
+ int *old_ceiling;
+{
+ /* The low bits of __kind aren't ever changed after pthread_mutex_init,
+ so we don't need a lock yet. */
+ if ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_PROTECT_PRIVATE_NP) == 0)
+ return EINVAL;
+
+ if (prioceiling < 0 || __builtin_expect (prioceiling > 255, 0))
+ return EINVAL;
+
+ /* XXX This needs to lock with TID, but shouldn't obey priority protect
+ protocol. */
+ /* lll_xxx_mutex_lock (mutex->__data.__lock); */
+
+ if (old_ceiling != NULL)
+ *old_ceiling = (mutex->__data.__kind & PTHREAD_MUTEX_PRIO_CEILING_MASK)
+ >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
+
+ int newkind = (mutex->__data.__kind & ~PTHREAD_MUTEX_PRIO_CEILING_MASK);
+ mutex->__data.__kind = newkind
+ | (prioceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT);
+
+ /* XXX This needs to unlock the above special kind of lock. */
+ /* lll_xxx_mutex_unlock (mutex->__data.__lock); */
+
+ return 0;
+}