X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;ds=sidebyside;f=libraries%2Flibldap_r%2Frdwr.c;h=83051a9b58323c5528c523982a3595d800f45aab;hb=7b7b2a33591de6ffbddfdf1817feeeb1e59c280a;hp=81febcbd2dbaa39f550bc3bba0a466a86ab10643;hpb=acbb5cf689a4336af05c9f259d909d8141055bac;p=openldap
diff --git a/libraries/libldap_r/rdwr.c b/libraries/libldap_r/rdwr.c
index 81febcbd2d..83051a9b58 100644
--- a/libraries/libldap_r/rdwr.c
+++ b/libraries/libldap_r/rdwr.c
@@ -1,7 +1,7 @@
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software .
*
- * Copyright 1998-2006 The OpenLDAP Foundation.
+ * Copyright 1998-2012 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -64,6 +64,7 @@ struct ldap_int_thread_rdwr_s {
#ifdef LDAP_RDWR_DEBUG
/* keep track of who has these locks */
#define MAX_READERS 32
+ int ltrw_more_readers; /* Set if ltrw_readers[] is incomplete */
ldap_pvt_thread_t ltrw_readers[MAX_READERS];
ldap_pvt_thread_t ltrw_writer;
#endif
@@ -78,6 +79,8 @@ ldap_pvt_thread_rdwr_init( ldap_pvt_thread_rdwr_t *rwlock )
rw = (struct ldap_int_thread_rdwr_s *) LDAP_CALLOC( 1,
sizeof( struct ldap_int_thread_rdwr_s ) );
+ if ( !rw )
+ return LDAP_NO_MEMORY;
/* we should check return results */
ldap_pvt_thread_mutex_init( &rw->ltrw_mutex );
@@ -171,7 +174,10 @@ int ldap_pvt_thread_rdwr_rlock( ldap_pvt_thread_rdwr_t *rwlock )
}
#ifdef LDAP_RDWR_DEBUG
- rw->ltrw_readers[rw->ltrw_r_active] = ldap_pvt_thread_self();
+ if( rw->ltrw_r_active < MAX_READERS )
+ rw->ltrw_readers[rw->ltrw_r_active] = ldap_pvt_thread_self();
+ else
+ rw->ltrw_more_readers = 1;
#endif
rw->ltrw_r_active++;
@@ -207,7 +213,10 @@ int ldap_pvt_thread_rdwr_rtrylock( ldap_pvt_thread_rdwr_t *rwlock )
}
#ifdef LDAP_RDWR_DEBUG
- rw->ltrw_readers[rw->ltrw_r_active] = ldap_pvt_thread_self();
+ if( rw->ltrw_r_active < MAX_READERS )
+ rw->ltrw_readers[rw->ltrw_r_active] = ldap_pvt_thread_self();
+ else
+ rw->ltrw_more_readers = 1;
#endif
rw->ltrw_r_active++;
@@ -231,23 +240,25 @@ int ldap_pvt_thread_rdwr_runlock( ldap_pvt_thread_rdwr_t *rwlock )
ldap_pvt_thread_mutex_lock( &rw->ltrw_mutex );
+ rw->ltrw_r_active--;
#ifdef LDAP_RDWR_DEBUG
/* Remove us from the list of readers */
- { int i, j;
- ldap_pvt_thread_t self = ldap_pvt_thread_self();
-
- for (i=0; iltrw_r_active;i++)
{
- if (rw->ltrw_readers[i] == self) {
- for (j=i; jltrw_r_active-1; j++)
- rw->ltrw_readers[j] = rw->ltrw_readers[j+1];
- rw->ltrw_readers[j] = 0;
- break;
+ ldap_pvt_thread_t self = ldap_pvt_thread_self();
+ int i, j;
+ for( i = j = rw->ltrw_r_active; i >= 0; i--) {
+ if (rw->ltrw_readers[i] == self) {
+ rw->ltrw_readers[i] = rw->ltrw_readers[j];
+ rw->ltrw_readers[j] = 0;
+ break;
+ }
}
- }
+ if( !rw->ltrw_more_readers )
+ assert( i >= 0 );
+ else if( j == 0 )
+ rw->ltrw_more_readers = 0;
}
#endif
- rw->ltrw_r_active--;
assert( rw->ltrw_w_active >= 0 );
assert( rw->ltrw_w_wait >= 0 );
@@ -370,6 +381,7 @@ int ldap_pvt_thread_rdwr_wunlock( ldap_pvt_thread_rdwr_t *rwlock )
}
#ifdef LDAP_RDWR_DEBUG
+ assert( rw->ltrw_writer == ldap_pvt_thread_self() );
rw->ltrw_writer = 0;
#endif
ldap_pvt_thread_mutex_unlock( &rw->ltrw_mutex );