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Diffstat (limited to 'libhurd-cap-server/obj-inhibit.c')
| -rw-r--r-- | libhurd-cap-server/obj-inhibit.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/libhurd-cap-server/obj-inhibit.c b/libhurd-cap-server/obj-inhibit.c deleted file mode 100644 index 22455b3..0000000 --- a/libhurd-cap-server/obj-inhibit.c +++ /dev/null @@ -1,131 +0,0 @@ -/* obj-inhibit.c - Inhibit RPCs on a capability object. - Copyright (C) 2004 Free Software Foundation, Inc. - Written by Marcus Brinkmann <marcus@gnu.org> - - This file is part of the GNU Hurd. - - This program 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. - - This program 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 this program; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#if HAVE_CONFIG_H -#include <config.h> -#endif - -#include <errno.h> -#include <pthread.h> -#include <stdlib.h> - -#include "cap-server-intern.h" - - -/* Inhibit all RPCs on the capability object CAP_OBJ (which must not - be locked). You _must_ follow up with a hurd_cap_obj_resume - operation, and hold at least one reference to the object - continuously until you did so. */ -error_t -hurd_cap_obj_inhibit (hurd_cap_obj_t obj) -{ - hurd_cap_class_t cap_class = obj->cap_class; - error_t err; - - /* First take the class-wide lock for conditions on capability - object states. */ - pthread_mutex_lock (&cap_class->obj_cond_lock); - - /* Then lock the object to check its state. */ - pthread_mutex_lock (&obj->lock); - - /* First wait until any other inhibitor has resumed the capability - object. This ensures that capability object inhibitions are - fully serialized (per capability object). */ - while (obj->state != _HURD_CAP_STATE_GREEN) - { - pthread_mutex_unlock (&obj->lock); - err = hurd_cond_wait (&cap_class->obj_cond, - &cap_class->obj_cond_lock); - if (err) - { - /* We have been canceled. */ - pthread_mutex_unlock (&cap_class->obj_cond_lock); - return err; - } - pthread_mutex_lock (&obj->lock); - } - - /* Now it is our turn to inhibit the capability object. */ - obj->cond_waiter = pthread_self (); - - if (_hurd_cap_obj_cond_busy (obj)) - { - _hurd_cap_list_item_t pending_rpc = obj->pending_rpcs; - - /* There are still pending RPCs (beside us). Cancel them. */ - while (pending_rpc) - { - if (pending_rpc->thread != obj->cond_waiter) - pthread_cancel (pending_rpc->thread); - pending_rpc = pending_rpc->next; - } - - /* Indicate that we would like to know when they have gone. */ - obj->state = _HURD_CAP_STATE_YELLOW; - - /* The last one will shut the door. */ - do - { - pthread_mutex_unlock (&obj->lock); - err = hurd_cond_wait (&cap_class->obj_cond, - &cap_class->obj_cond_lock); - if (err) - { - /* We have been canceled ourselves. Give up. */ - obj->state = _HURD_CAP_STATE_GREEN; - pthread_mutex_unlock (&cap_class->obj_cond_lock); - return err; - } - pthread_mutex_lock (&obj->lock); - } - while (obj->state != _HURD_CAP_STATE_RED); - } - else - obj->state = _HURD_CAP_STATE_RED; - - /* Now all pending RPCs have been canceled and are completed (except - us), and all incoming RPCs are inhibited. */ - pthread_mutex_unlock (&obj->lock); - pthread_mutex_unlock (&cap_class->obj_cond_lock); - - return 0; -} - - -/* Resume RPCs on the capability object OBJ and wake-up all - waiters. */ -void -hurd_cap_obj_resume (hurd_cap_obj_t obj) -{ - hurd_cap_class_t cap_class = obj->cap_class; - - pthread_mutex_lock (&cap_class->obj_cond_lock); - pthread_mutex_lock (&obj->lock); - - obj->state = _HURD_CAP_STATE_GREEN; - - /* Broadcast the change to all potential waiters. */ - pthread_cond_broadcast (&cap_class->obj_cond); - - pthread_mutex_unlock (&obj->lock); - pthread_mutex_unlock (&cap_class->obj_cond_lock); -} |