1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
6: * $Id: aitsched.h,v 1.4.2.1 2012/01/08 02:01:41 misho Exp $
7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #ifndef __AITSCHED_H
47: #define __AITSCHED_H
48:
49:
50: #include <sys/types.h>
51: #include <sys/queue.h>
52: #include <sys/uio.h>
53: #include <stdint.h>
54:
55:
56: /* criteria type */
57: #define CRITERIA_CALL 0
58: #define CRITERIA_ARG 1
59: #define CRITERIA_FD 2
60: #define CRITERIA_VAL 3
61: #define CRITERIA_TV 4
62:
63:
64: /* early declaration for root & task */
65: typedef struct sched_Task sched_task_t;
66: typedef struct sched_RootTask sched_root_task_t;
67:
68: typedef enum {
69: taskREAD = 0,
70: taskWRITE,
71: taskTIMER,
72: taskEVENT,
73: taskREADY,
74: taskUNUSE,
75: taskMAX
76: } sched_task_type_t;
77:
78: /* hooks */
79: typedef void *(*sched_hook_func_t)(void *, void *);
80: struct sched_HooksTask {
81: struct {
82: /* read(sched_task_t *task, NULL) -> int */
83: sched_hook_func_t read;
84: /* write(sched_task_t *task, NULL) -> int */
85: sched_hook_func_t write;
86: /* event(sched_task_t *task, NULL) -> int */
87: sched_hook_func_t event;
88: /* eventlo(sched_task_t *task, NULL) -> int */
89: sched_hook_func_t eventlo;
90: /* timer(sched_task_t *task, struct timeval *tv) -> int */
91: sched_hook_func_t timer;
92: } hook_add;
93: struct {
94: /* cancel(sched_task_t *task, NULL) -> int */
95: sched_hook_func_t cancel;
96: /* run(sched_root_task_t *root, NULL) -> int */
97: sched_hook_func_t run;
98: /* fetch(sched_root_task_t *root, NULL) -> sched_task_t* */
99: sched_hook_func_t fetch;
100: /* exception(sched_root_task_t *root, NULL) -> int */
101: sched_hook_func_t exception;
102: } hook_exec;
103: struct {
104: /* init(sched_root_task_t *root, void *data) -> int */
105: sched_hook_func_t init;
106: /* fini(sched_root_task_t *root, NULL) -> int */
107: sched_hook_func_t fini;
108: /* error(sched_root_task_t *root, int errno) -> int */
109: sched_hook_func_t error;
110: } hook_root;
111: };
112: typedef struct sched_HooksTask hooks_task_t;
113:
114: /* task callback, like pthread callback! */
115: typedef void *(*sched_task_func_t)(sched_task_t * /* current task data*/);
116:
117: /* task lock helpers */
118: #define TASK_LOCK(x) ((x)->task_lock++)
119: #define TASK_UNLOCK(x) ((x)->task_lock ^= (x)->task_lock)
120: #define TASK_ISLOCKED(x) ((x)->task_lock)
121:
122: /* task & queue */
123: struct sched_Task {
124: volatile int task_lock;
125: unsigned int task_id;
126: sched_task_type_t task_type;
127:
128: sched_root_task_t *task_root;
129: #define TASK_ROOT(x) (x)->task_root
130: sched_task_func_t task_func;
131:
132: void *task_arg;
133: union {
134: unsigned long v;
135: intptr_t fd;
136: struct timeval tv;
137: } task_val;
138: #define TASK_ARG(x) (x)->task_arg
139: #define TASK_VAL(x) (x)->task_val.v
140: #define TASK_FD(x) (x)->task_val.fd
141: #define TASK_TV(x) (x)->task_val.tv
142:
143: struct iovec task_data;
144: #define TASK_DATA(x) (x)->task_data.iov_base
145: #define TASK_DATLEN(x) (x)->task_data.iov_len
146:
147: TAILQ_ENTRY(sched_Task) task_node;
148: };
149: typedef TAILQ_HEAD(, sched_Task) sched_queue_t;
150:
151: /* root lock helpers */
152: #define ROOT_QLOCK(x, q) (pthread_mutex_lock(&(x)->root_mtx[(q)]))
153: #define ROOT_QUNLOCK(x, q) (pthread_mutex_unlock(&(x)->root_mtx[(q)]))
154:
155: /* root task */
156: struct sched_RootTask {
157: int root_kq;
158: struct timeval root_wait;
159: pthread_mutex_t root_mtx[taskMAX];
160:
161: sched_queue_t root_read;
162: sched_queue_t root_write;
163: sched_queue_t root_timer;
164: sched_queue_t root_event;
165: sched_queue_t root_ready;
166: sched_queue_t root_unuse;
167: sched_queue_t root_eventlo;
168: int root_eventlo_miss;
169:
170: hooks_task_t root_hooks;
171: struct iovec root_data;
172: #define ROOT_DATA(x) (x)->root_data.iov_base
173: #define ROOT_DATLEN(x) (x)->root_data.iov_len
174: };
175:
176:
177: inline int sched_GetErrno();
178: inline const char *sched_GetError();
179:
180:
181: /*
182: * schedInit() - Init scheduler
183: * @data = optional data if !=NULL
184: * @datlen = data len if data is set
185: * return: allocated root task if ok or NULL error
186: */
187: sched_root_task_t *schedInit(void ** __restrict data, size_t datlen);
188: #define schedBegin() schedInit((void**) &schedRegisterHooks, 0)
189: /*
190: * schedEnd() - End scheduler & free all resources
191: * @root = root task
192: * return: -1 error or 0 ok
193: */
194: int schedEnd(sched_root_task_t ** __restrict root);
195: /*
196: * schedRegisterHooks() - Register IO handles and bind tasks to it
197: * @root = root task
198: * return: -1 error or 0 ok
199: */
200: int schedRegisterHooks(sched_root_task_t * __restrict root);
201: /*
202: * schedCall() - Call task execution function
203: * @task = current task
204: * return: !=NULL error or =NULL ok
205: */
206: inline void *schedCall(sched_task_t * __restrict task);
207: /*
208: * schedFetch() - Fetch ready task
209: * @root = root task
210: * return: =NULL error or !=NULL ready task
211: */
212: inline void *schedFetch(sched_root_task_t * __restrict root);
213: /*
214: * schedRun() - Scheduler *run loop*
215: * @root = root task
216: * @killState = kill condition variable, if !=0 stop scheduler loop
217: * return: -1 error or 0 ok
218: */
219: int schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState);
220: /*
221: * schedCancel() - Cancel task from scheduler
222: * @task = task
223: * return: -1 error or 0 ok
224: */
225: int schedCancel(sched_task_t * __restrict task);
226: /*
227: * schedCancelby() - Cancel task from scheduler by criteria
228: * @root = root task
229: * @queue = cancel from queue, if =NULL cancel same task from all queues
230: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
231: * @param = search parameter
232: * @hook = custom cleanup hook function, may be NULL
233: * return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
234: */
235: int schedCancelby(sched_root_task_t * __restrict root, sched_queue_t * __restrict queue,
236: u_char criteria, void *param, sched_hook_func_t hook);
237:
238:
239: /*
240: * schedRead() - Add READ I/O task to scheduler queue
241: * @root = root task
242: * @func = task execution function
243: * @arg = 1st func argument
244: * @fd = fd handle
245: * return: NULL error or !=NULL new queued task
246: */
247: sched_task_t *schedRead(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, int fd);
248: /*
249: * schedWrite() - Add WRITE I/O task to scheduler queue
250: * @root = root task
251: * @func = task execution function
252: * @arg = 1st func argument
253: * @fd = fd handle
254: * return: NULL error or !=NULL new queued task
255: */
256: sched_task_t *schedWrite(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, int fd);
257: /*
258: * schedTimer() - Add TIMER task to scheduler queue
259: * @root = root task
260: * @func = task execution function
261: * @arg = 1st func argument
262: * @tv = timeout argument structure
263: * return: NULL error or !=NULL new queued task
264: */
265: sched_task_t *schedTimer(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, struct timeval tv);
266: /*
267: * schedEvent() - Add EVENT task to scheduler queue
268: * @root = root task
269: * @func = task execution function
270: * @arg = 1st func argument
271: * @val = additional func argument
272: * return: NULL error or !=NULL new queued task
273: */
274: sched_task_t *schedEvent(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
275: /*
276: * schedEventLo() - Add EVENT_Lo task to scheduler queue
277: * @root = root task
278: * @func = task execution function
279: * @arg = 1st func argument
280: * @val = additional func argument
281: * return: NULL error or !=NULL new queued task
282: */
283: sched_task_t *schedEventLo(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
284: /*
285: * schedCallOnce() - Call once from scheduler
286: * @root = root task
287: * @func = task execution function
288: * @arg = 1st func argument
289: * @val = additional func argument
290: * return: return value from called func
291: */
292: sched_task_t *schedCallOnce(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg, unsigned long val);
293:
294:
295: #endif
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