Annotation of libaitsched/src/aitsched.c, revision 1.4.2.8
1.1 misho 1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.4.2.8 ! misho 6: * $Id: aitsched.c,v 1.4.2.7 2012/01/24 15:29:09 misho Exp $
1.1 misho 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: #include "global.h"
47: #include "hooks.h"
48:
49:
50: #pragma GCC visibility push(hidden)
51:
52: int sched_Errno;
53: char sched_Error[STRSIZ];
54:
55: #pragma GCC visibility pop
56:
57:
58: // sched_GetErrno() Get error code of last operation
59: inline int
60: sched_GetErrno()
61: {
62: return sched_Errno;
63: }
64:
65: // sched_GetError() Get error text of last operation
66: inline const char *
67: sched_GetError()
68: {
69: return sched_Error;
70: }
71:
72: // sched_SetErr() Set error to variables for internal use!!!
73: inline void
74: sched_SetErr(int eno, char *estr, ...)
75: {
76: va_list lst;
77:
78: sched_Errno = eno;
79: memset(sched_Error, 0, sizeof sched_Error);
80: va_start(lst, estr);
81: vsnprintf(sched_Error, sizeof sched_Error, estr, lst);
82: va_end(lst);
83: }
84:
85: /* Init and prepare scheduler functions */
86:
87: /*
1.2 misho 88: * schedRegisterHooks() - Register IO handles and bind tasks to it
89: * @root = root task
90: * return: -1 error or 0 ok
91: */
92: int
93: schedRegisterHooks(sched_root_task_t * __restrict root)
94: {
95: if (!root || (root->root_data.iov_base && root->root_data.iov_len))
96: return -1;
97:
98: if (root->root_hooks.hook_root.fini)
99: root->root_hooks.hook_root.fini(root, NULL);
100: memset(&root->root_hooks, 0, sizeof root->root_hooks);
101:
102: root->root_hooks.hook_add.read = sched_hook_read;
103: root->root_hooks.hook_add.write = sched_hook_write;
104:
105: root->root_hooks.hook_exec.cancel = sched_hook_cancel;
106: root->root_hooks.hook_exec.fetch = sched_hook_fetch;
1.3 misho 107: root->root_hooks.hook_exec.exception = sched_hook_exception;
1.2 misho 108:
109: root->root_hooks.hook_root.init = sched_hook_init;
110: root->root_hooks.hook_root.fini = sched_hook_fini;
111: return 0;
112: }
113:
114: /*
1.1 misho 115: * schedInit() - Init scheduler
116: * @data = optional data if !=NULL
117: * @datlen = data len if data is set
118: * return: allocated root task if ok or NULL error
119: */
120: sched_root_task_t *
121: schedInit(void ** __restrict data, size_t datlen)
122: {
123: sched_root_task_t *root = NULL;
124: int (*func)(sched_root_task_t *);
1.4.2.1 misho 125: #ifdef HAVE_LIBPTHREAD
126: register int i;
127: #endif
1.1 misho 128:
129: root = malloc(sizeof(sched_root_task_t));
1.2 misho 130: if (!root) {
131: LOGERR;
132: } else {
1.1 misho 133: memset(root, 0, sizeof(sched_root_task_t));
1.4.2.1 misho 134:
1.4.2.6 misho 135: /* INFINIT polling period by default */
1.4.2.8 ! misho 136: sched_timespecinf(&root->root_poll);
1.4.2.6 misho 137:
1.4.2.1 misho 138: #ifdef HAVE_LIBPTHREAD
139: for (i = 0; i < taskMAX; i++)
140: if (pthread_mutex_init(&root->root_mtx[i], NULL)) {
141: LOGERR;
142: while (i)
143: pthread_mutex_destroy(&root->root_mtx[--i]);
144: free(root);
145: return NULL;
146: }
147:
148: for (i = 0; i < taskMAX; i++)
1.4.2.2 misho 149: pthread_mutex_lock(&root->root_mtx[i]);
1.4.2.1 misho 150: #endif
151:
1.2 misho 152: TAILQ_INIT(&root->root_read);
153: TAILQ_INIT(&root->root_write);
154: TAILQ_INIT(&root->root_timer);
155: TAILQ_INIT(&root->root_event);
156: TAILQ_INIT(&root->root_eventlo);
157: TAILQ_INIT(&root->root_ready);
158: TAILQ_INIT(&root->root_unuse);
1.1 misho 159:
1.4.2.1 misho 160: #ifdef HAVE_LIBPTHREAD
161: for (i = 0; i < taskMAX; i++)
1.4.2.2 misho 162: pthread_mutex_unlock(&root->root_mtx[i]);
1.4.2.1 misho 163: #endif
164:
1.1 misho 165: if (data && *data) {
166: if (datlen) {
167: root->root_data.iov_base = *data;
168: root->root_data.iov_len = datlen;
1.3 misho 169: } else { /* if datlen == 0, switch to callbacks init mode */
170: /* little hack :) for correct initialization of scheduler */
1.2 misho 171: func = (int(*)(sched_root_task_t*)) data;
1.1 misho 172: func(root);
173: }
174: }
1.2 misho 175:
176: if (root->root_hooks.hook_root.init)
177: root->root_hooks.hook_root.init(root, NULL);
1.1 misho 178: }
179:
180: return root;
181: }
182:
183: /*
184: * schedEnd() - End scheduler & free all resources
185: * @root = root task
186: * return: -1 error or 0 ok
187: */
188: int
1.2 misho 189: schedEnd(sched_root_task_t ** __restrict root)
1.1 misho 190: {
191: sched_task_t *task;
1.4.2.1 misho 192: #ifdef HAVE_LIBPTHREAD
193: register int i;
194: #endif
1.1 misho 195:
1.2 misho 196: if (!root || !*root)
1.1 misho 197: return -1;
198:
1.2 misho 199: TAILQ_FOREACH(task, &(*root)->root_read, task_node) {
1.1 misho 200: schedCancel(task);
201: }
1.2 misho 202: TAILQ_FOREACH(task, &(*root)->root_write, task_node) {
1.1 misho 203: schedCancel(task);
204: }
1.2 misho 205: TAILQ_FOREACH(task, &(*root)->root_timer, task_node) {
1.1 misho 206: schedCancel(task);
207: }
1.2 misho 208: TAILQ_FOREACH(task, &(*root)->root_event, task_node) {
1.1 misho 209: schedCancel(task);
210: }
1.4.2.2 misho 211: TAILQ_FOREACH(task, &(*root)->root_eventlo, task_node) {
212: schedCancel(task);
213: }
1.2 misho 214: TAILQ_FOREACH(task, &(*root)->root_ready, task_node) {
1.1 misho 215: schedCancel(task);
216: }
217:
1.4.2.3 misho 218: #ifdef HAVE_LIBPTHREAD
219: pthread_mutex_lock(&(*root)->root_mtx[taskUNUSE]);
220: #endif
1.2 misho 221: while ((task = TAILQ_FIRST(&(*root)->root_unuse))) {
222: TAILQ_REMOVE(&(*root)->root_unuse, task, task_node);
1.1 misho 223: free(task);
224: }
1.4.2.1 misho 225: #ifdef HAVE_LIBPTHREAD
1.4.2.3 misho 226: pthread_mutex_unlock(&(*root)->root_mtx[taskUNUSE]);
1.4.2.1 misho 227: #endif
1.1 misho 228:
1.2 misho 229: if ((*root)->root_hooks.hook_root.fini)
230: (*root)->root_hooks.hook_root.fini(*root, NULL);
1.1 misho 231:
1.4.2.1 misho 232: #ifdef HAVE_LIBPTHREAD
233: for (i = 0; i < taskMAX; i++)
234: pthread_mutex_destroy(&(*root)->root_mtx[i]);
235: #endif
236:
1.2 misho 237: free(*root);
238: *root = NULL;
1.1 misho 239: return 0;
240: }
241:
242: /*
243: * schedCall() - Call task execution function
244: * @task = current task
245: * return: !=NULL error or =NULL ok
246: */
247: inline void *
248: schedCall(sched_task_t * __restrict task)
249: {
1.4 misho 250: void *ptr = (void*) -1;
251:
1.1 misho 252: if (!task)
1.4 misho 253: return ptr;
254:
255: if (!TASK_ISLOCKED(task))
256: TASK_LOCK(task);
1.1 misho 257:
258: task->task_id++;
1.4 misho 259: ptr = task->task_func(task);
260:
261: TASK_UNLOCK(task);
262: return ptr;
1.1 misho 263: }
264:
265: /*
266: * schedFetch() - Fetch ready task
267: * @root = root task
268: * return: =NULL error or !=NULL ready task
269: */
270: inline void *
271: schedFetch(sched_root_task_t * __restrict root)
272: {
273: void *ptr;
274:
275: if (!root)
276: return NULL;
277:
278: if (root->root_hooks.hook_exec.fetch)
279: ptr = root->root_hooks.hook_exec.fetch(root, NULL);
280: else
281: ptr = NULL;
282:
283: return ptr;
284: }
285:
286: /*
287: * schedCancel() - Cancel task from scheduler
288: * @task = task
289: * return: -1 error or 0 ok
290: */
291: int
292: schedCancel(sched_task_t * __restrict task)
293: {
294: sched_queue_t *queue;
295:
1.4.2.2 misho 296: if (!task || !TASK_ROOT(task))
1.1 misho 297: return -1;
298:
1.4.2.2 misho 299: if (TASK_ROOT(task)->root_hooks.hook_exec.cancel)
300: if (TASK_ROOT(task)->root_hooks.hook_exec.cancel(task, NULL))
1.1 misho 301: return -1;
302:
1.4.2.2 misho 303: switch (TASK_TYPE(task)) {
1.1 misho 304: case taskREAD:
1.4.2.2 misho 305: queue = &TASK_ROOT(task)->root_read;
1.1 misho 306: break;
307: case taskWRITE:
1.4.2.2 misho 308: queue = &TASK_ROOT(task)->root_write;
1.1 misho 309: break;
310: case taskTIMER:
1.4.2.2 misho 311: queue = &TASK_ROOT(task)->root_timer;
1.1 misho 312: break;
313: case taskEVENT:
1.4.2.2 misho 314: queue = &TASK_ROOT(task)->root_event;
315: break;
316: case taskEVENTLO:
317: queue = &TASK_ROOT(task)->root_eventlo;
1.1 misho 318: break;
319: case taskREADY:
1.4.2.2 misho 320: queue = &TASK_ROOT(task)->root_ready;
1.1 misho 321: break;
322: default:
323: queue = NULL;
324: }
1.4.2.2 misho 325: if (queue) {
326: #ifdef HAVE_LIBPTHREAD
327: pthread_mutex_lock(&TASK_ROOT(task)->root_mtx[TASK_TYPE(task)]);
328: #endif
1.1 misho 329: TAILQ_REMOVE(queue, task, task_node);
1.4.2.2 misho 330: #ifdef HAVE_LIBPTHREAD
331: pthread_mutex_unlock(&TASK_ROOT(task)->root_mtx[TASK_TYPE(task)]);
332: #endif
333: }
334: if (TASK_TYPE(task) != taskUNUSE)
1.4 misho 335: _sched_unuseTask(task);
1.1 misho 336:
337: return 0;
338: }
339:
340: /*
341: * schedCancelby() - Cancel task from scheduler by criteria
342: * @root = root task
1.4.2.2 misho 343: * @type = cancel from queue type, if =taskMAX cancel same task from all queues
1.1 misho 344: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
345: * @param = search parameter
346: * @hook = custom cleanup hook function, may be NULL
1.3 misho 347: * return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
1.1 misho 348: */
349: int
1.4.2.2 misho 350: schedCancelby(sched_root_task_t * __restrict root, sched_task_type_t type,
1.1 misho 351: u_char criteria, void *param, sched_hook_func_t hook)
352: {
353: sched_task_t *task;
1.4.2.2 misho 354: sched_queue_t *queue;
1.1 misho 355: int flg = 0;
356:
357: if (!root)
358: return -1;
1.4.2.2 misho 359: if (type == taskMAX) {
360: if (schedCancelby(root, taskREAD, criteria, param, hook))
1.1 misho 361: return -2;
1.4.2.2 misho 362: if (schedCancelby(root, taskWRITE, criteria, param, hook))
1.1 misho 363: return -2;
1.4.2.2 misho 364: if (schedCancelby(root, taskTIMER, criteria, param, hook))
1.1 misho 365: return -2;
1.4.2.2 misho 366: if (schedCancelby(root, taskEVENT, criteria, param, hook))
1.1 misho 367: return -2;
1.4.2.2 misho 368: if (schedCancelby(root, taskEVENTLO, criteria, param, hook))
1.1 misho 369: return -2;
1.4.2.2 misho 370: if (schedCancelby(root, taskREADY, criteria, param, hook))
1.1 misho 371: return -2;
372: return 0;
373: }
1.4.2.2 misho 374: switch (type) {
375: case taskREAD:
376: queue = &root->root_read;
377: break;
378: case taskWRITE:
379: queue = &root->root_write;
380: break;
381: case taskTIMER:
382: queue = &root->root_timer;
383: break;
384: case taskEVENT:
385: queue = &root->root_event;
386: break;
387: case taskEVENTLO:
388: queue = &root->root_eventlo;
389: break;
390: case taskREADY:
391: queue = &root->root_ready;
392: break;
393: default:
394: return 0;
395: }
1.1 misho 396:
1.4.2.2 misho 397: #ifdef HAVE_LIBPTHREAD
398: pthread_mutex_lock(&root->root_mtx[type]);
399: #endif
1.1 misho 400: TAILQ_FOREACH(task, queue, task_node)
401: if (criteria == CRITERIA_CALL) {
402: if (task->task_func == (sched_task_func_t) param) {
403: flg++;
404: break;
405: }
406: } else if (criteria == CRITERIA_ARG) {
407: if (task->task_arg == param) {
408: flg++;
409: break;
410: }
411: } else if (criteria == CRITERIA_FD) {
1.3 misho 412: if (TASK_FD(task) == (intptr_t) param) {
1.1 misho 413: flg++;
414: break;
415: }
416: } else if (criteria == CRITERIA_VAL) {
417: if (TASK_VAL(task) == (u_long) param) {
418: flg++;
419: break;
420: }
421: } else if (criteria == CRITERIA_TV) {
1.4.2.7 misho 422: if (!sched_timespeccmp(&TASK_TS(task), (struct timespec*) param, -)) {
1.1 misho 423: flg++;
424: break;
425: }
426: } else {
1.4.2.2 misho 427: #ifdef HAVE_LIBPTHREAD
428: pthread_mutex_unlock(&root->root_mtx[type]);
429: #endif
1.1 misho 430: sched_SetErr(EINVAL, "Invalid parameter criteria %d", criteria);
431: return -1;
432: }
1.4.2.2 misho 433: #ifdef HAVE_LIBPTHREAD
434: pthread_mutex_unlock(&root->root_mtx[type]);
435: #endif
1.1 misho 436: if (!flg || !task) /* task not found */
437: return 0;
438:
1.4.2.2 misho 439: if (TASK_ROOT(task)->root_hooks.hook_exec.cancel)
440: if (TASK_ROOT(task)->root_hooks.hook_exec.cancel(task, NULL))
1.1 misho 441: return -1;
442: if (hook)
443: if (hook(task, NULL))
444: return -3;
445:
1.4.2.2 misho 446: #ifdef HAVE_LIBPTHREAD
447: pthread_mutex_lock(&TASK_ROOT(task)->root_mtx[type]);
448: #endif
1.1 misho 449: TAILQ_REMOVE(queue, task, task_node);
1.4.2.2 misho 450: #ifdef HAVE_LIBPTHREAD
451: pthread_mutex_unlock(&TASK_ROOT(task)->root_mtx[type]);
452: #endif
1.1 misho 453:
1.4.2.2 misho 454: if (TASK_TYPE(task) != taskUNUSE)
1.4 misho 455: _sched_unuseTask(task);
1.1 misho 456: return 0;
457: }
458:
459: /*
460: * schedRun() - Scheduler *run loop*
461: * @root = root task
1.2 misho 462: * @killState = kill condition variable, if !=0 stop scheduler loop
1.1 misho 463: * return: -1 error or 0 ok
464: */
465: int
1.2 misho 466: schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState)
1.1 misho 467: {
468: sched_task_t *task;
469:
470: if (!root)
471: return -1;
472:
473: if (root->root_hooks.hook_exec.run)
474: if (root->root_hooks.hook_exec.run(root, NULL))
475: return -1;
1.2 misho 476: if (root->root_hooks.hook_exec.fetch) {
477: if (killState)
1.3 misho 478: while (!*killState) {
479: if ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
480: schedCall(task);
481: }
1.2 misho 482: else
483: while ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
484: schedCall(task);
485: }
1.1 misho 486:
487: return 0;
488: }
1.4.2.5 misho 489:
490: /*
491: * schedPolling() - Polling timeout period if no timer task is present
492: * @root = root task
493: * @ts = timeout polling period, if ==NULL INFINIT timeout
494: * @tsold = old timeout polling if !=NULL
495: * return: -1 error or 0 ok
496: */
497: inline int
498: schedPolling(sched_root_task_t * __restrict root, struct timespec * __restrict ts,
499: struct timespec * __restrict tsold)
500: {
501: if (!root)
502: return -1;
503:
504: if (tsold)
505: *tsold = root->root_poll;
506:
507: if (!ts)
1.4.2.8 ! misho 508: sched_timespecinf(&root->root_poll);
1.4.2.5 misho 509: else
510: root->root_poll = *ts;
511:
512: return 0;
513: }
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