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 1.9 2012/05/30 08:52:45 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, 2012
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: #include <pthread.h>
55:
56:
57: /* criteria type */
58: #define CRITERIA_CALL 0
59: #define CRITERIA_ARG 1
60: #define CRITERIA_FD 2
61: #define CRITERIA_VAL 3
62: #define CRITERIA_TS 4
63:
64:
65: /* early declaration for root & task */
66: typedef struct sched_Task sched_task_t;
67: typedef struct sched_RootTask sched_root_task_t;
68:
69: typedef enum {
70: taskREAD = 0,
71: taskWRITE,
72: taskTIMER,
73: taskEVENT,
74: taskEVENTLO,
75: taskALARM,
76: taskREADY,
77: taskUNUSE,
78: taskMAX
79: } sched_task_type_t;
80:
81: /* hooks */
82: typedef void *(*sched_hook_func_t)(void *, void *);
83: struct sched_HooksTask {
84: struct {
85: /* read(sched_task_t *task, NULL) -> int */
86: sched_hook_func_t read;
87: /* write(sched_task_t *task, NULL) -> int */
88: sched_hook_func_t write;
89: /* event(sched_task_t *task, NULL) -> int */
90: sched_hook_func_t event;
91: /* eventlo(sched_task_t *task, NULL) -> int */
92: sched_hook_func_t eventlo;
93: /* alarm(sched_task_t *task, NULL) -> int */
94: sched_hook_func_t alarm;
95: /* timer(sched_task_t *task, struct timespec *ts) -> int */
96: sched_hook_func_t timer;
97: } hook_add;
98: struct {
99: /* cancel(sched_task_t *task, NULL) -> int */
100: sched_hook_func_t cancel;
101: /* run(sched_root_task_t *root, NULL) -> int */
102: sched_hook_func_t run;
103: /* fetch(sched_root_task_t *root, NULL) -> sched_task_t* */
104: sched_hook_func_t fetch;
105: /* exception(sched_root_task_t *root, NULL) -> int */
106: sched_hook_func_t exception;
107: /* condition(sched_root_task_t *root, intptr_t *stopValue) -> int */
108: sched_hook_func_t condition;
109: } hook_exec;
110: struct {
111: /* init(sched_root_task_t *root, void *data) -> int */
112: sched_hook_func_t init;
113: /* fini(sched_root_task_t *root, NULL) -> int */
114: sched_hook_func_t fini;
115: /* error(sched_root_task_t *root, int errno) -> int */
116: sched_hook_func_t error;
117: } hook_root;
118: };
119: typedef struct sched_HooksTask hooks_task_t;
120:
121: /* task callback, like pthread callback! */
122: typedef void *(*sched_task_func_t)(sched_task_t * /* current task data*/);
123:
124: /* task lock helpers */
125: #define TASK_LOCK(x) ((x)->task_lock++)
126: #define TASK_UNLOCK(x) ((x)->task_lock ^= (x)->task_lock)
127: #define TASK_ISLOCKED(x) ((x)->task_lock)
128:
129: /* task & queue */
130: struct sched_Task {
131: volatile int task_lock;
132: unsigned int task_id;
133: sched_task_type_t task_type;
134: #define TASK_TYPE(x) (x)->task_type
135:
136: sched_root_task_t *task_root;
137: #define TASK_ROOT(x) (x)->task_root
138: sched_task_func_t task_func;
139: #define TASK_FUNC(x) (x)->task_func
140:
141: void *task_arg;
142: union {
143: unsigned long v;
144: intptr_t fd;
145: struct timespec ts;
146: } task_val;
147: #define TASK_ARG(x) (x)->task_arg
148: #define TASK_VAL(x) (x)->task_val.v
149: #define TASK_FD(x) (x)->task_val.fd
150: #define TASK_TS(x) (x)->task_val.ts
151:
152: struct iovec task_data;
153: #define TASK_DATA(x) (x)->task_data.iov_base
154: #define TASK_DATLEN(x) (x)->task_data.iov_len
155:
156: TAILQ_ENTRY(sched_Task) task_node;
157: };
158: typedef TAILQ_HEAD(, sched_Task) sched_queue_t;
159: #define TASK_DATA_SET(x, _dp, _dl) do { \
160: if ((x)) { \
161: (x)->task_data.iov_base = (_dp); \
162: (x)->task_data.iov_len = _dl; \
163: } \
164: while (0)
165:
166: /* root task */
167: struct sched_RootTask {
168: int root_kq;
169: struct timespec root_wait;
170: struct timespec root_poll;
171: intptr_t root_cond;
172:
173: pthread_mutex_t root_mtx[taskMAX];
174:
175: sched_queue_t root_read;
176: sched_queue_t root_write;
177: sched_queue_t root_timer;
178: sched_queue_t root_alarm;
179: sched_queue_t root_event;
180: sched_queue_t root_ready;
181: sched_queue_t root_unuse;
182: sched_queue_t root_eventlo;
183: int root_eventlo_miss;
184:
185: hooks_task_t root_hooks;
186: struct iovec root_data;
187: #define ROOT_DATA(x) (x)->root_data.iov_base
188: #define ROOT_DATLEN(x) (x)->root_data.iov_len
189: };
190: #define ROOT_QUEUE_EMPTY(x, _q) TAILQ_EMPTY(&((x)->root_##_q))
191:
192:
193: inline int sched_GetErrno();
194: inline const char *sched_GetError();
195:
196:
197: /*
198: * schedInit() - Init scheduler
199: *
200: * @data = optional data if !=NULL
201: * @datlen = data len if data is set
202: * return: allocated root task if ok or NULL error
203: */
204: sched_root_task_t *schedInit(void ** __restrict data, size_t datlen);
205: #define schedBegin() schedInit((void**) &schedRegisterHooks, 0)
206: /*
207: * schedEnd() - End scheduler & free all resources
208: *
209: * @root = root task
210: * return: -1 error or 0 ok
211: */
212: int schedEnd(sched_root_task_t ** __restrict root);
213: /*
214: * schedRegisterHooks() - Register IO handles and bind tasks to it
215: *
216: * @root = root task
217: * return: -1 error or 0 ok
218: */
219: int schedRegisterHooks(sched_root_task_t * __restrict root);
220: /*
221: * schedPolling() - Polling timeout period if no timer task is present
222: *
223: * @root = root task
224: * @ts = timeout polling period, if ==NULL INFINIT timeout
225: * @tsold = old timeout polling if !=NULL
226: * return: -1 error or 0 ok
227: */
228: inline int schedPolling(sched_root_task_t * __restrict root,
229: struct timespec * __restrict ts, struct timespec * __restrict tsold);
230: /*
231: * schedTermCondition() - Activate hook for scheduler condition kill
232: *
233: * @root = root task
234: * @condValue = condition value, kill schedRun() if condValue == killState
235: * return: -1 error ok 0 ok
236: */
237: inline int schedTermCondition(sched_root_task_t * __restrict root, intptr_t condValue);
238: /*
239: * schedCall() - Call task execution function
240: *
241: * @task = current task
242: * return: !=NULL error or =NULL ok
243: */
244: inline void *schedCall(sched_task_t * __restrict task);
245: /*
246: * schedFetch() - Fetch ready task
247: *
248: * @root = root task
249: * return: =NULL error or !=NULL ready task
250: */
251: inline void *schedFetch(sched_root_task_t * __restrict root);
252: /*
253: * schedRun() - Scheduler *run loop*
254: *
255: * @root = root task
256: * @killState = kill condition variable, if !=0 stop scheduler loop
257: * return: -1 error or 0 ok
258: */
259: int schedRun(sched_root_task_t *root, volatile intptr_t * __restrict killState);
260: /*
261: * schedCancel() - Cancel task from scheduler
262: *
263: * @task = task
264: * return: -1 error or 0 ok
265: */
266: int schedCancel(sched_task_t * __restrict task);
267: /*
268: * schedCancelby() - Cancel task from scheduler by criteria
269: *
270: * @root = root task
271: * @type = cancel from queue type, if =taskMAX cancel same task from all queues
272: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TS]
273: * @param = search parameter
274: * @hook = custom cleanup hook function, may be NULL
275: * return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
276: */
277: int schedCancelby(sched_root_task_t * __restrict root, sched_task_type_t type,
278: u_char criteria, void *param, sched_hook_func_t hook);
279:
280:
281: /*
282: * schedRead() - Add READ I/O task to scheduler queue
283: *
284: * @root = root task
285: * @func = task execution function
286: * @arg = 1st func argument
287: * @fd = fd handle
288: * @opt_data = Optional data
289: * @opt_dlen = Optional data length
290: * return: NULL error or !=NULL new queued task
291: */
292: sched_task_t *schedRead(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
293: int fd, void *opt_data, size_t opt_dlen);
294: #define schedReadSelf(x) schedRead(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
295: TASK_FD((x)), TASK_DATA((x)), TASK_DATLEN((x)))
296: /*
297: * schedWrite() - Add WRITE I/O task to scheduler queue
298: *
299: * @root = root task
300: * @func = task execution function
301: * @arg = 1st func argument
302: * @fd = fd handle
303: * @opt_data = Optional data
304: * @opt_dlen = Optional data length
305: * return: NULL error or !=NULL new queued task
306: */
307: sched_task_t *schedWrite(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
308: int fd, void *opt_data, size_t opt_dlen);
309: #define schedWriteSelf(x) schedWrite(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
310: TASK_FD((x)), TASK_DATA((x)), TASK_DATLEN((x)))
311: /*
312: * schedAlarm() - Add ALARM task to scheduler queue
313: *
314: * @root = root task
315: * @func = task execution function
316: * @arg = 1st func argument
317: * @ts = timeout argument structure, minimum alarm timer resolution is 1msec!
318: * @opt_data = Optional data
319: * @opt_dlen = Optional data length
320: * return: NULL error or !=NULL new queued task
321: */
322: sched_task_t *schedAlarm(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
323: struct timespec ts, void *opt_data, size_t opt_dlen);
324: #define schedAlarmSelf(x) schedAlarm(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
325: TASK_TS((x)), TASK_DATA((x)), TASK_DATLEN((x)))
326: /*
327: * schedTimer() - Add TIMER task to scheduler queue
328: *
329: * @root = root task
330: * @func = task execution function
331: * @arg = 1st func argument
332: * @ts = timeout argument structure
333: * @opt_data = Optional data
334: * @opt_dlen = Optional data length
335: * return: NULL error or !=NULL new queued task
336: */
337: sched_task_t *schedTimer(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
338: struct timespec ts, void *opt_data, size_t opt_dlen);
339: #define schedTimerSelf(x) schedTimer(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
340: TASK_TS((x)), TASK_DATA((x)), TASK_DATLEN((x)))
341: /*
342: * schedEvent() - Add EVENT task to scheduler queue
343: *
344: * @root = root task
345: * @func = task execution function
346: * @arg = 1st func argument
347: * @val = additional func argument
348: * @opt_data = Optional data
349: * @opt_dlen = Optional data length
350: * return: NULL error or !=NULL new queued task
351: */
352: sched_task_t *schedEvent(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
353: unsigned long val, void *opt_data, size_t opt_dlen);
354: #define schedEventSelf(x) schedEvent(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
355: TASK_VAL((x)), TASK_DATA((x)), TASK_DATLEN((x)))
356: /*
357: * schedEventLo() - Add EVENT_Lo task to scheduler queue
358: *
359: * @root = root task
360: * @func = task execution function
361: * @arg = 1st func argument
362: * @val = additional func argument
363: * @opt_data = Optional data
364: * @opt_dlen = Optional data length
365: * return: NULL error or !=NULL new queued task
366: */
367: sched_task_t *schedEventLo(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
368: unsigned long val, void *opt_data, size_t opt_dlen);
369: #define schedEventLoSelf(x) schedEventLo(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
370: TASK_VAL((x)), TASK_DATA((x)), TASK_DATLEN((x)))
371: /*
372: * schedCallOnce() - Call once from scheduler
373: *
374: * @root = root task
375: * @func = task execution function
376: * @arg = 1st func argument
377: * @val = additional func argument
378: * @opt_data = Optional data
379: * @opt_dlen = Optional data length
380: * return: return value from called func
381: */
382: sched_task_t *schedCallOnce(sched_root_task_t * __restrict root, sched_task_func_t func, void *arg,
383: unsigned long val, void *opt_data, size_t opt_dlen);
384: #define schedCallAgain(x) schedCallOnce(TASK_ROOT((x)), TASK_FUNC((x)), TASK_ARG((x)), \
385: TASK_VAL((x)), TASK_DATA((x)), TASK_DATLEN((x)))
386:
387:
388: #endif
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