/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
* by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: aitsched.h,v 1.3.2.1 2011/12/08 09:17:34 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:
All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
by Michael Pounov <misho@elwix.org>. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. 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.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET 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 AITNET AND CONTRIBUTORS ``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 REGENTS 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.
*/
#ifndef __AITSCHED_H
#define __AITSCHED_H
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <stdint.h>
/* criteria type */
#define CRITERIA_CALL 0
#define CRITERIA_ARG 1
#define CRITERIA_FD 2
#define CRITERIA_VAL 3
#define CRITERIA_TV 4
/* early declaration for root & task */
typedef struct sched_Task sched_task_t;
typedef struct sched_RootTask sched_root_task_t;
typedef enum {
taskREAD = 0,
taskWRITE,
taskTIMER,
taskEVENT,
taskREADY,
taskUNUSE,
taskMAX
} sched_task_type_t;
/* hooks */
typedef void *(*sched_hook_func_t)(void *, void *);
struct sched_HooksTask {
struct {
/* read(sched_task_t *task, NULL) -> int */
sched_hook_func_t read;
/* write(sched_task_t *task, NULL) -> int */
sched_hook_func_t write;
/* event(sched_task_t *task, NULL) -> int */
sched_hook_func_t event;
/* eventlo(sched_task_t *task, NULL) -> int */
sched_hook_func_t eventlo;
/* timer(sched_task_t *task, struct timeval *tv) -> int */
sched_hook_func_t timer;
} hook_add;
struct {
/* cancel(sched_task_t *task, NULL) -> int */
sched_hook_func_t cancel;
/* run(sched_root_task_t *root, NULL) -> int */
sched_hook_func_t run;
/* fetch(sched_root_task_t *root, NULL) -> sched_task_t* */
sched_hook_func_t fetch;
/* exception(sched_root_task_t *root, NULL) -> int */
sched_hook_func_t exception;
} hook_exec;
struct {
/* init(sched_root_task_t *root, void *data) -> int */
sched_hook_func_t init;
/* fini(sched_root_task_t *root, NULL) -> int */
sched_hook_func_t fini;
/* error(sched_root_task_t *root, int errno) -> int */
sched_hook_func_t error;
} hook_root;
};
typedef struct sched_HooksTask hooks_task_t;
/* task callback, like pthread callback! */
typedef void *(*sched_task_func_t)(sched_task_t * /* current task data*/);
/* task lock helpers */
#define TASK_LOCK(x) ((x)->task_lock++)
#define TASK_UNLOCK(x) ((x)->task_lock ^= (x)->task_lock)
#define TASK_ISLOCKED(x) ((x)->task_lock)
/* task & queue */
struct sched_Task {
volatile int task_lock;
unsigned int task_id;
sched_task_type_t task_type;
sched_root_task_t *task_root;
#define TASK_ROOT(x) (x)->task_root
sched_task_func_t task_func;
void *task_arg;
union {
unsigned long v;
intptr_t fd;
struct timeval tv;
} task_val;
#define TASK_ARG(x) (x)->task_arg
#define TASK_VAL(x) (x)->task_val.v
#define TASK_FD(x) (x)->task_val.fd
#define TASK_TV(x) (x)->task_val.tv
struct iovec task_data;
#define TASK_DATA(x) (x)->task_data.iov_base
#define TASK_DATLEN(x) (x)->task_data.iov_len
TAILQ_ENTRY(sched_Task) task_node;
};
typedef TAILQ_HEAD(, sched_Task) sched_queue_t;
/* root task */
struct sched_RootTask {
int root_kq;
struct timeval root_wait;
sched_queue_t root_read;
sched_queue_t root_write;
sched_queue_t root_timer;
sched_queue_t root_event;
sched_queue_t root_ready;
sched_queue_t root_unuse;
sched_queue_t root_eventlo;
int root_eventlo_miss;
hooks_task_t root_hooks;
struct iovec root_data;
#define ROOT_DATA(x) (x)->root_data.iov_base
#define ROOT_DATLEN(x) (x)->root_data.iov_len
};
inline int sched_GetErrno();
inline const char *sched_GetError();
/*
* schedInit() - Init scheduler
* @data = optional data if !=NULL
* @datlen = data len if data is set
* return: allocated root task if ok or NULL error
*/
sched_root_task_t *schedInit(void ** __restrict data, size_t datlen);
#define schedBegin() schedInit((void**) &schedRegisterHooks, 0)
/*
* schedEnd() - End scheduler & free all resources
* @root = root task
* return: -1 error or 0 ok
*/
int schedEnd(sched_root_task_t ** __restrict root);
/*
* schedRegisterHooks() - Register IO handles and bind tasks to it
* @root = root task
* return: -1 error or 0 ok
*/
int schedRegisterHooks(sched_root_task_t * __restrict root);
/*
* schedCall() - Call task execution function
* @task = current task
* return: !=NULL error or =NULL ok
*/
inline void *schedCall(sched_task_t * __restrict task);
/*
* schedFetch() - Fetch ready task
* @root = root task
* return: =NULL error or !=NULL ready task
*/
inline void *schedFetch(sched_root_task_t * __restrict root);
/*
* schedRun() - Scheduler *run loop*
* @root = root task
* @killState = kill condition variable, if !=0 stop scheduler loop
* return: -1 error or 0 ok
*/
int schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState);
/*
* schedCancel() - Cancel task from scheduler
* @task = task
* return: -1 error or 0 ok
*/
int schedCancel(sched_task_t * __restrict task);
/*
* schedCancelby() - Cancel task from scheduler by criteria
* @root = root task
* @queue = cancel from queue, if =NULL cancel same task from all queues
* @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
* @param = search parameter
* @hook = custom cleanup hook function, may be NULL
* return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
*/
int schedCancelby(sched_root_task_t * __restrict root, sched_queue_t * __restrict queue,
u_char criteria, void *param, sched_hook_func_t hook);
/*
* schedRead() - Add READ I/O task to scheduler queue
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @fd = fd handle
* return: NULL error or !=NULL new queued task
*/
sched_task_t *schedRead(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, int fd);
/*
* schedWrite() - Add WRITE I/O task to scheduler queue
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @fd = fd handle
* return: NULL error or !=NULL new queued task
*/
sched_task_t *schedWrite(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, int fd);
/*
* schedTimer() - Add TIMER task to scheduler queue
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @tv = timeout argument structure
* return: NULL error or !=NULL new queued task
*/
sched_task_t *schedTimer(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, struct timeval tv);
/*
* schedEvent() - Add EVENT task to scheduler queue
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @val = additional func argument
* return: NULL error or !=NULL new queued task
*/
sched_task_t *schedEvent(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
/*
* schedEventLo() - Add EVENT_Lo task to scheduler queue
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @val = additional func argument
* return: NULL error or !=NULL new queued task
*/
sched_task_t *schedEventLo(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
/*
* schedCallOnce() - Call once from scheduler
* @root = root task
* @func = task execution function
* @arg = 1st func argument
* @val = additional func argument
* return: return value from called func
*/
sched_task_t *schedCallOnce(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
#endif
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