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/* libevent_support.c - routines to bridge libldap and libevent */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2017-2022 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#include <ac/time.h>
#include <event2/event.h>
#include <event2/thread.h>
#include "lload.h"
#include "ldap_pvt_thread.h"
static void *
lload_libevent_mutex_init( unsigned locktype )
{
int rc;
ldap_pvt_thread_mutex_t *mutex =
ch_malloc( sizeof(ldap_pvt_thread_mutex_t) );
if ( locktype & EVTHREAD_LOCKTYPE_RECURSIVE ) {
rc = ldap_pvt_thread_mutex_recursive_init( mutex );
} else {
rc = ldap_pvt_thread_mutex_init( mutex );
}
if ( rc ) {
ch_free( mutex );
mutex = NULL;
}
return mutex;
}
static void
lload_libevent_mutex_destroy( void *lock, unsigned locktype )
{
int rc;
ldap_pvt_thread_mutex_t *mutex = lock;
rc = ldap_pvt_thread_mutex_destroy( mutex );
assert( rc == 0 );
ch_free( mutex );
}
static int
lload_libevent_mutex_lock( unsigned mode, void *lock )
{
ldap_pvt_thread_mutex_t *mutex = lock;
if ( mode & EVTHREAD_TRY ) {
return ldap_pvt_thread_mutex_trylock( mutex );
} else {
return ldap_pvt_thread_mutex_lock( mutex );
}
}
static int
lload_libevent_mutex_unlock( unsigned mode, void *lock )
{
ldap_pvt_thread_mutex_t *mutex = lock;
return ldap_pvt_thread_mutex_unlock( mutex );
}
static void *
lload_libevent_cond_init( unsigned condtype )
{
int rc;
ldap_pvt_thread_cond_t *cond =
ch_malloc( sizeof(ldap_pvt_thread_cond_t) );
assert( condtype == 0 );
rc = ldap_pvt_thread_cond_init( cond );
if ( rc ) {
ch_free( cond );
cond = NULL;
}
return cond;
}
static void
lload_libevent_cond_destroy( void *c )
{
int rc;
ldap_pvt_thread_cond_t *cond = c;
rc = ldap_pvt_thread_cond_destroy( cond );
assert( rc == 0 );
ch_free( c );
}
static int
lload_libevent_cond_signal( void *c, int broadcast )
{
ldap_pvt_thread_cond_t *cond = c;
if ( broadcast ) {
return ldap_pvt_thread_cond_broadcast( cond );
} else {
return ldap_pvt_thread_cond_signal( cond );
}
}
static int
lload_libevent_cond_timedwait(
void *c,
void *lock,
const struct timeval *timeout )
{
ldap_pvt_thread_cond_t *cond = c;
ldap_pvt_thread_mutex_t *mutex = lock;
/*
* libevent does not seem to request a timeout, this is true as of 2.1.8
* that has just been marked the first stable release of the 2.1 series
*/
assert( timeout == NULL );
return ldap_pvt_thread_cond_wait( cond, mutex );
}
int
lload_libevent_init( void )
{
struct evthread_lock_callbacks cbs = {
EVTHREAD_LOCK_API_VERSION,
EVTHREAD_LOCKTYPE_RECURSIVE,
lload_libevent_mutex_init,
lload_libevent_mutex_destroy,
lload_libevent_mutex_lock,
lload_libevent_mutex_unlock
};
struct evthread_condition_callbacks cond_cbs = {
EVTHREAD_CONDITION_API_VERSION,
lload_libevent_cond_init,
lload_libevent_cond_destroy,
lload_libevent_cond_signal,
lload_libevent_cond_timedwait
};
#ifndef BALANCER_MODULE
/* only necessary if lload is a server, slapd already calls
* ldap_pvt_thread_initialize() */
if ( ldap_pvt_thread_initialize() ) {
return -1;
}
#endif
evthread_set_lock_callbacks( &cbs );
evthread_set_condition_callbacks( &cond_cbs );
evthread_set_id_callback( ldap_pvt_thread_self );
return 0;
}
void
lload_libevent_destroy( void )
{
libevent_global_shutdown();
}
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