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Fix reader/writer bug that allowed 2 writers! Yiks.

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Reported by tsarna@endicor.com
This commit is contained in:
Kurt Zeilenga 1999-12-08 23:54:33 +00:00
parent 6a26e68a02
commit fd9f76f911
1 changed files with 4 additions and 4 deletions
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8
libraries/libldap_r/rdwr.c
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@ -53,7 +53,7 @@ ldap_pvt_thread_rdwr_destroy( ldap_pvt_thread_rdwr_t *rw )
ldap_pvt_thread_mutex_lock( &rw->ltrw_mutex );
/* active threads? */
if( rw->ltrw_r_active > 0 || rw->ltrw_w_active > 1) {
if( rw->ltrw_r_active > 0 || rw->ltrw_w_active > 0) {
ldap_pvt_thread_mutex_unlock( &rw->ltrw_mutex );
return LDAP_PVT_THREAD_EBUSY;
}
@ -85,7 +85,7 @@ int ldap_pvt_thread_rdwr_rlock( ldap_pvt_thread_rdwr_t *rw )
ldap_pvt_thread_mutex_lock( &rw->ltrw_mutex );
if( rw->ltrw_w_active > 1 ) {
if( rw->ltrw_w_active > 0 ) {
/* writer is active */
rw->ltrw_r_wait++;
@ -93,7 +93,7 @@ int ldap_pvt_thread_rdwr_rlock( ldap_pvt_thread_rdwr_t *rw )
do {
ldap_pvt_thread_cond_wait(
&rw->ltrw_read, &rw->ltrw_mutex );
} while( rw->ltrw_w_active > 1 );
} while( rw->ltrw_w_active > 0 );
rw->ltrw_r_wait--;
}
@ -115,7 +115,7 @@ int ldap_pvt_thread_rdwr_rtrylock( ldap_pvt_thread_rdwr_t *rw )
ldap_pvt_thread_mutex_lock( &rw->ltrw_mutex );
if( rw->ltrw_w_active > 1) {
if( rw->ltrw_w_active > 0) {
ldap_pvt_thread_mutex_unlock( &rw->ltrw_mutex );
return LDAP_PVT_THREAD_EBUSY;
}