openldap/libraries/libldap_r/threads.c

/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2010 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 file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/stdarg.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include <ac/unistd.h>

#include "ldap_pvt_thread.h" /* Get the thread interface */
#include "ldap_thr_debug.h"  /* May redirect thread initialize/destroy calls */


/*
 * Common LDAP thread routines
 *	see thr_*.c for implementation specific routines
 *	see rdwr.c for generic reader/writer lock implementation
 *	see tpool.c for generic thread pool implementation
 */


int ldap_pvt_thread_initialize( void )
{
	int rc;
	static int init = 0;
	ldap_pvt_thread_rmutex_t rm;
	ldap_pvt_thread_t tid;

	/* we only get one shot at this */
	if( init++ ) return -1;

	rc = ldap_int_thread_initialize();
	if( rc ) return rc;

#ifndef LDAP_THREAD_HAVE_TPOOL
	rc = ldap_int_thread_pool_startup();
	if( rc ) return rc;
#endif

	/* kludge to pull symbol definitions in */
	ldap_pvt_thread_rmutex_init( &rm );
	tid = ldap_pvt_thread_self();
	ldap_pvt_thread_rmutex_lock( &rm, tid );
	ldap_pvt_thread_rmutex_trylock( &rm, tid );
	ldap_pvt_thread_rmutex_unlock( &rm, tid );
	ldap_pvt_thread_rmutex_unlock( &rm, tid );
	ldap_pvt_thread_rmutex_destroy( &rm );

	return 0;
}

int ldap_pvt_thread_destroy( void )
{
#ifndef LDAP_THREAD_HAVE_TPOOL
	(void) ldap_int_thread_pool_shutdown();
#endif
	return ldap_int_thread_destroy();
}


/*
 * Default implementations of some LDAP thread routines
 */

#define LDAP_THREAD_IMPLEMENTATION
#include "ldap_thr_debug.h"	/* May rename the symbols defined below */


#ifndef LDAP_THREAD_HAVE_GETCONCURRENCY
int
ldap_pvt_thread_get_concurrency ( void )
{
	return 1;
}
#endif

#ifndef LDAP_THREAD_HAVE_SETCONCURRENCY
int
ldap_pvt_thread_set_concurrency ( int concurrency )
{
	return 1;
}
#endif

#ifndef LDAP_THREAD_HAVE_SLEEP
/*
 * Here we assume we have fully preemptive threads and that sleep()
 * does the right thing.
 */
unsigned int
ldap_pvt_thread_sleep(
	unsigned int interval
)
{
	sleep( interval );
	return 0;
}
#endif