From a5f2bd861c4c84ac66164951a7f32e1d6f57849c Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Tue, 28 Feb 2006 09:57:07 +0000 Subject: * elf/rtld-Rules (subdir-args): New variable. (rtld-subdir-make): Use it. --- nptl/pthread_mutex_setprioceiling.c | 55 +++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 nptl/pthread_mutex_setprioceiling.c (limited to 'nptl/pthread_mutex_setprioceiling.c') diff --git a/nptl/pthread_mutex_setprioceiling.c b/nptl/pthread_mutex_setprioceiling.c new file mode 100644 index 0000000000..999b635ac1 --- /dev/null +++ b/nptl/pthread_mutex_setprioceiling.c @@ -0,0 +1,55 @@ +/* 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 , 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 +#include + + +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; +} -- cgit v1.2.3