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   1 /*
   2  * Copyright 1998,1999 The OpenLDAP Foundation, Redwood City, California, USA
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted only
   6  * as authorized by the OpenLDAP Public License.  A copy of this
   7  * license is available at http://www.OpenLDAP.org/license.html or
   8  * in file LICENSE in the top-level directory of the distribution.
   9  */
  10
  11 #ifndef _LTHREAD_RDWR_H
  12 #define _LTHREAD_RDWR_H 1
  13
  14 /********************************************************
  15  * An example source module to accompany...
  16  *
  17  * "Using POSIX Threads: Programming with Pthreads"
  18  *     by Brad nichols, Dick Buttlar, Jackie Farrell
  19  *     O'Reilly & Associates, Inc.
  20  *
  21  ********************************************************
  22  *
  23  * Include file for reader/writer locks
  24  *
  25  */
  26
  27 #include <ldap_cdefs.h>
  28
  29 LDAP_BEGIN_DECL
  30
  31 typedef struct rdwr_var {
  32         int readers_reading;
  33         int writer_writing;
  34         pthread_mutex_t mutex;
  35         pthread_cond_t lock_free;
  36 } pthread_rdwr_t;
  37
  38 typedef void * pthread_rdwrattr_t;
  39
  40 #define pthread_rdwrattr_default NULL;
  41
  42 LDAP_F int pthread_rdwr_init_np LDAP_P((pthread_rdwr_t *rdwrp, pthread_rdwrattr_t *attrp));
  43 LDAP_F int pthread_rdwr_rlock_np LDAP_P((pthread_rdwr_t *rdwrp));
  44 LDAP_F int pthread_rdwr_runlock_np LDAP_P((pthread_rdwr_t *rdwrp));
  45 LDAP_F int pthread_rdwr_wlock_np LDAP_P((pthread_rdwr_t *rdwrp));
  46 LDAP_F int pthread_rdwr_wunlock_np LDAP_P((pthread_rdwr_t *rdwrp));
  47
  48 #ifdef LDAP_DEBUG
  49 LDAP_F int pthread_rdwr_rchk_np LDAP_P((pthread_rdwr_t *rdwrp));
  50 LDAP_F int pthread_rdwr_wchk_np LDAP_P((pthread_rdwr_t *rdwrp));
  51 LDAP_F int pthread_rdwr_rwchk_np LDAP_P((pthread_rdwr_t *rdwrp));
  52 #endif /* LDAP_DEBUG */
  53
  54 LDAP_END_DECL
  55
  56 #endif /* _LTHREAD_RDWR_H */