summaryrefslogtreecommitdiff
path: root/src/lib/rw_lock.c
diff options
context:
space:
mode:
authordimitri staessens <dimitri.staessens@intec.ugent.be>2016-06-20 23:49:35 +0200
committerdimitri staessens <dimitri.staessens@intec.ugent.be>2016-06-21 00:14:14 +0200
commita46114ec01e8d174a41744f4f1b49905613847dc (patch)
tree9a76d884afc10c276c0b4e3af989d68a9556551b /src/lib/rw_lock.c
parent34f96731f5fb8ab8a1f7018366fc28fd041d73e2 (diff)
downloadouroboros-a46114ec01e8d174a41744f4f1b49905613847dc.tar.gz
ouroboros-a46114ec01e8d174a41744f4f1b49905613847dc.zip
lib, irmd, ipcp: robust mutexes
Update to POSIX 200112L to allow use of robust mutexes in the shm_du_map. Removed the implementation of the rw_lock in favor of pthread_rwlock_t. Placeholder for the shm_du_map_sanitize function.
Diffstat (limited to 'src/lib/rw_lock.c')
-rw-r--r--src/lib/rw_lock.c127
1 files changed, 0 insertions, 127 deletions
diff --git a/src/lib/rw_lock.c b/src/lib/rw_lock.c
deleted file mode 100644
index ba285694..00000000
--- a/src/lib/rw_lock.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016
- *
- * Read/Write locks
- *
- * Dimitri Staessens <dimitri.staessens@intec.ugent.be>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <ouroboros/rw_lock.h>
-
-int rw_lock_init(rw_lock_t * lock)
-{
- if (lock == NULL)
- return -1;
-
- pthread_mutex_init(&lock->lock, NULL);
- pthread_mutex_init(&lock->i_lock, NULL);
- lock->i = 0;
-
- return 0;
-}
-
-void rw_lock_destroy(rw_lock_t * lock)
-{
- if (lock == NULL)
- return;
-
- pthread_mutex_destroy(&lock->lock);
- pthread_mutex_destroy(&lock->i_lock);
- lock->i = -1;
-}
-
-int rw_lock_rdlock(rw_lock_t * lock)
-{
- int ret = 0;
-
- if (lock == NULL)
- return -1;
-
- pthread_mutex_lock(&lock->i_lock);
-
- if (lock->i < 0) {
- pthread_mutex_unlock(&lock->i_lock);
- return -1;
- }
-
- if (lock->i == 0)
- ret = pthread_mutex_lock(&lock->lock);
-
- ++(lock->i);
-
- pthread_mutex_unlock(&lock->i_lock);
-
- return ret;
-}
-
-int rw_lock_wrlock(rw_lock_t * lock)
-{
- int ret = 0;
-
- if (lock == NULL)
- return -1;
-
- pthread_mutex_lock(&lock->i_lock);
-
- if (lock->i < 0) {
- pthread_mutex_unlock(&lock->i_lock);
- return -1;
- }
-
- pthread_mutex_unlock(&lock->i_lock);
-
- while (1) {
- pthread_mutex_lock(&lock->i_lock);
-
- if (lock->i == 0) {
- ++(lock->i);
- ret = pthread_mutex_lock(&lock->lock);
- pthread_mutex_unlock(&lock->i_lock);
- break;
- }
-
- pthread_mutex_unlock(&lock->i_lock);
-
- sched_yield();
- }
-
- return ret;
-}
-
-int rw_lock_unlock(rw_lock_t * lock)
-{
- int ret = 0;
-
- if (lock == NULL)
- return -1;
-
- pthread_mutex_lock(&lock->i_lock);
-
- if (lock->i < 0) {
- pthread_mutex_unlock(&lock->i_lock);
- return -1;
- }
-
- --(lock->i);
-
- if (lock->i == 0)
- ret = pthread_mutex_unlock(&lock->lock);
-
- pthread_mutex_unlock(&lock->i_lock);
-
- return ret;
-}