[mirror_corosync.git] / exec / schedwrk.c

/*
 * Copyright (c) 2009-2010 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Steven Dake (sdake@redhat.com)
 *
 * This software licensed under BSD license, the text of which follows:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the MontaVista Software, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <config.h>
#include <corosync/totem/totempg.h>
#include <corosync/hdb.h>
#include "schedwrk.h"

static void (*serialize_lock) (void);
static void (*serialize_unlock) (void);

DECLARE_HDB_DATABASE (schedwrk_instance_database,NULL);

struct schedwrk_instance {
	int (*schedwrk_fn) (const void *);
	const void *context;
	void *callback_handle;
	int lock;
};

static int schedwrk_do (enum totem_callback_token_type type, const void *context)
{
	hdb_handle_t handle = *((hdb_handle_t *)context);
	struct schedwrk_instance *instance;
	int res;

	res = hdb_handle_get (&schedwrk_instance_database,
		handle,
		(void *)&instance);
	if (res != 0) {
		goto error_exit;
	}

	if (instance->lock)
		serialize_lock ();

	res = instance->schedwrk_fn (instance->context);

	if (instance->lock)
		serialize_unlock ();

	if (res == 0) {
		hdb_handle_destroy (&schedwrk_instance_database, handle);
	}
        hdb_handle_put (&schedwrk_instance_database, handle);
	return (res);

error_exit:
	return (-1);
}

void schedwrk_init (
	void (*serialize_lock_fn) (void),
	void (*serialize_unlock_fn) (void))
{
	serialize_lock = serialize_lock_fn;
	serialize_unlock = serialize_unlock_fn;
}

static int schedwrk_internal_create (
	hdb_handle_t *handle,
	int (schedwrk_fn) (const void *),
	const void *context,
	int lock)
{
	struct schedwrk_instance *instance;
	int res;

	res = hdb_handle_create (&schedwrk_instance_database,
		sizeof (struct schedwrk_instance), handle);
	if (res != 0) {
		goto error_exit;
	}
	res = hdb_handle_get (&schedwrk_instance_database, *handle,
		(void *)&instance);
	if (res != 0) {
		goto error_destroy;
	}

	totempg_callback_token_create (
		&instance->callback_handle,
		TOTEM_CALLBACK_TOKEN_SENT,
		1,
		schedwrk_do,
		handle);

	instance->schedwrk_fn = schedwrk_fn;
	instance->context = context;
	instance->lock = lock;

        hdb_handle_put (&schedwrk_instance_database, *handle);

	return (0);

error_destroy:
	hdb_handle_destroy (&schedwrk_instance_database, *handle);

error_exit:
	return (-1);
}

/*
 * handle pointer is internally used by totempg_callback_token_create. To make schedwrk work,
 * handle must be pointer to ether heap or .text or static memory (not stack) which is not
 * changed by caller.
 */
int schedwrk_create (
	hdb_handle_t *handle,
	int (schedwrk_fn) (const void *),
	const void *context)
{
	return schedwrk_internal_create (handle, schedwrk_fn, context, 1);
}

int schedwrk_create_nolock (
	hdb_handle_t *handle,
	int (schedwrk_fn) (const void *),
	const void *context)
{
	return schedwrk_internal_create (handle, schedwrk_fn, context, 0);
}

void schedwrk_destroy (hdb_handle_t handle)
{
	hdb_handle_destroy (&schedwrk_instance_database, handle);
}
Commit	Line	Data
35b073a7	1	/*
2ad0cdc8	2	* Copyright (c) 2009-2010 Red Hat, Inc.
35b073a7 SD	3	*
	4	* All rights reserved.
	5	*
	6	* Author: Steven Dake (sdake@redhat.com)
	7	*
	8	* This software licensed under BSD license, the text of which follows:
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions are met:
	12	*
	13	* - Redistributions of source code must retain the above copyright notice,
	14	* this list of conditions and the following disclaimer.
	15	* - Redistributions in binary form must reproduce the above copyright notice,
	16	* this list of conditions and the following disclaimer in the documentation
	17	* and/or other materials provided with the distribution.
	18	* - Neither the name of the MontaVista Software, Inc. nor the names of its
	19	* contributors may be used to endorse or promote products derived from this
	20	* software without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTIBUTORS "AS IS"
	23	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	26	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	31	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	32	* THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
	34
62c2186d	35	#include <config.h>
35b073a7 SD	36	#include <corosync/totem/totempg.h>
	37	#include <corosync/hdb.h>
	38	#include "schedwrk.h"
	39
	40	static void (*serialize_lock) (void);
	41	static void (*serialize_unlock) (void);
	42
1beb0c1f	43	DECLARE_HDB_DATABASE (schedwrk_instance_database,NULL);
35b073a7 SD	44
	45	struct schedwrk_instance {
	46	int (schedwrk_fn) (const void );
	47	const void *context;
	48	void *callback_handle;
f4a644c7	49	int lock;
35b073a7 SD	50	};
	51
	52	static int schedwrk_do (enum totem_callback_token_type type, const void *context)
	53	{
b93d75ab	54	hdb_handle_t handle = ((hdb_handle_t )context);
35b073a7 SD	55	struct schedwrk_instance *instance;
	56	int res;
	57
	58	res = hdb_handle_get (&schedwrk_instance_database,
b93d75ab	59	handle,
35b073a7 SD	60	(void *)&instance);
	61	if (res != 0) {
	62	goto error_exit;
	63	}
	64
f4a644c7 JF	65	if (instance->lock)
	66	serialize_lock ();
	67
35b073a7	68	res = instance->schedwrk_fn (instance->context);
f4a644c7 JF	69
	70	if (instance->lock)
	71	serialize_unlock ();
35b073a7 SD	72
35b073a7 SD	73	if (res == 0) {
b93d75ab	74	hdb_handle_destroy (&schedwrk_instance_database, handle);
35b073a7	75	}
b93d75ab	76	hdb_handle_put (&schedwrk_instance_database, handle);
35b073a7 SD	77	return (res);
	78
	79	error_exit:
	80	return (-1);
	81	}
7c312c6f	82
35b073a7 SD	83	void schedwrk_init (
	84	void (*serialize_lock_fn) (void),
	85	void (*serialize_unlock_fn) (void))
	86	{
	87	serialize_lock = serialize_lock_fn;
	88	serialize_unlock = serialize_unlock_fn;
	89	}
	90
f4a644c7	91	static int schedwrk_internal_create (
35b073a7 SD	92	hdb_handle_t *handle,
35b073a7 SD	93	int (schedwrk_fn) (const void *),
f4a644c7 JF	94	const void *context,
f4a644c7 JF	95	int lock)
35b073a7 SD	96	{
	97	struct schedwrk_instance *instance;
	98	int res;
	99
	100	res = hdb_handle_create (&schedwrk_instance_database,
	101	sizeof (struct schedwrk_instance), handle);
	102	if (res != 0) {
	103	goto error_exit;
	104	}
	105	res = hdb_handle_get (&schedwrk_instance_database, *handle,
	106	(void *)&instance);
	107	if (res != 0) {
	108	goto error_destroy;
	109	}
	110
	111	totempg_callback_token_create (
	112	&instance->callback_handle,
	113	TOTEM_CALLBACK_TOKEN_SENT,
	114	1,
	115	schedwrk_do,
b93d75ab	116	handle);
35b073a7 SD	117
	118	instance->schedwrk_fn = schedwrk_fn;
	119	instance->context = context;
f4a644c7	120	instance->lock = lock;
35b073a7 SD	121
	122	hdb_handle_put (&schedwrk_instance_database, *handle);
	123
	124	return (0);
	125
	126	error_destroy:
	127	hdb_handle_destroy (&schedwrk_instance_database, *handle);
	128
	129	error_exit:
	130	return (-1);
	131	}
	132
b93d75ab JF	133	/*
	134	* handle pointer is internally used by totempg_callback_token_create. To make schedwrk work,
	135	* handle must be pointer to ether heap or .text or static memory (not stack) which is not
	136	* changed by caller.
	137	*/
f4a644c7 JF	138	int schedwrk_create (
	139	hdb_handle_t *handle,
	140	int (schedwrk_fn) (const void *),
	141	const void *context)
	142	{
	143	return schedwrk_internal_create (handle, schedwrk_fn, context, 1);
	144	}
	145
	146	int schedwrk_create_nolock (
	147	hdb_handle_t *handle,
	148	int (schedwrk_fn) (const void *),
	149	const void *context)
	150	{
	151	return schedwrk_internal_create (handle, schedwrk_fn, context, 0);
	152	}
	153
35b073a7 SD	154	void schedwrk_destroy (hdb_handle_t handle)
	155	{
	156	hdb_handle_destroy (&schedwrk_instance_database, handle);
	157	}