schedwrk.c
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/*
* 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);
}
config.h
totem_callback_token_type
totem_callback_token_type
The totem_callback_token_type enum.
Definition coroapi.h:142
TOTEM_CALLBACK_TOKEN_SENT
@ TOTEM_CALLBACK_TOKEN_SENT
Definition coroapi.h:144
hdb.h
DECLARE_HDB_DATABASE
#define DECLARE_HDB_DATABASE
Definition hdb.h:98
hdb_handle_t
qb_handle_t hdb_handle_t
Definition hdb.h:52
lock
pthread_mutex_t lock
Definition sam.c:131
schedwrk_init
void schedwrk_init(void(*serialize_lock_fn)(void), void(*serialize_unlock_fn)(void))
Definition schedwrk.c:83
schedwrk_create
int schedwrk_create(hdb_handle_t *handle, int(schedwrk_fn)(const void *), const void *context)
Definition schedwrk.c:138
schedwrk_destroy
void schedwrk_destroy(hdb_handle_t handle)
Definition schedwrk.c:154
schedwrk_create_nolock
int schedwrk_create_nolock(hdb_handle_t *handle, int(schedwrk_fn)(const void *), const void *context)
Definition schedwrk.c:146
schedwrk.h
schedwrk_instance
Definition schedwrk.c:45
schedwrk_instance::schedwrk_fn
int(* schedwrk_fn)(const void *)
Definition schedwrk.c:46
schedwrk_instance::context
const void * context
Definition schedwrk.c:47
schedwrk_instance::callback_handle
void * callback_handle
Definition schedwrk.c:48
schedwrk_instance::lock
int lock
Definition schedwrk.c:49
type
char type
Definition totem.h:2
totempg.h
Totem Single Ring Protocol.
totempg_callback_token_create
int totempg_callback_token_create(void **handle_out, enum totem_callback_token_type type, int delete, int(*callback_fn)(enum totem_callback_token_type type, const void *), const void *data)
Definition totempg.c:1102