/*
* Bacula Thread Read/Write locking code. It permits
- * multiple readers but only one writer.
+ * multiple readers but only one writer.
*
* Kern Sibbald, January MMI
*
*
*/
/*
- Copyright (C) 2000, 2001, 2002 Kern Sibbald and John Walker
+ Copyright (C) 2001-2006 Kern Sibbald
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.
+ modify it under the terms of the GNU General Public License
+ version 2 as amended with additional clauses defined in the
+ file LICENSE in the main source directory.
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., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ the file LICENSE for additional details.
*/
-#ifndef __RWLOCK_H
+#ifndef __RWLOCK_H
#define __RWLOCK_H 1
typedef struct s_rwlock_tag {
int w_wait; /* writers waiting */
} brwlock_t;
+typedef struct s_rwsteal_tag {
+ pthread_t writer_id; /* writer's thread id */
+ int state;
+} brwsteal_t;
+
+
#define RWLOCK_VALID 0xfacade
#define RWL_INIIALIZER \
{PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, \
PTHREAD_COND_INITIALIZER, RWLOCK_VALID, 0, 0, 0, 0}
-/*
+/*
* read/write lock prototypes
*/
extern int rwl_init(brwlock_t *wrlock);