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.c,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: #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: /*
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;
107: root->root_hooks.hook_exec.exception = sched_hook_exception;
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: /*
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 *);
125: #ifdef HAVE_LIBPTHREAD
126: register int i;
127: #endif
128:
129: root = malloc(sizeof(sched_root_task_t));
130: if (!root) {
131: LOGERR;
132: } else {
133: memset(root, 0, sizeof(sched_root_task_t));
134:
135: #ifdef HAVE_LIBPTHREAD
136: for (i = 0; i < taskMAX; i++)
137: if (pthread_mutex_init(&root->root_mtx[i], NULL)) {
138: LOGERR;
139: while (i)
140: pthread_mutex_destroy(&root->root_mtx[--i]);
141: free(root);
142: return NULL;
143: }
144:
145: for (i = 0; i < taskMAX; i++)
146: ROOT_QLOCK(root, i);
147: #endif
148:
149: TAILQ_INIT(&root->root_read);
150: TAILQ_INIT(&root->root_write);
151: TAILQ_INIT(&root->root_timer);
152: TAILQ_INIT(&root->root_event);
153: TAILQ_INIT(&root->root_eventlo);
154: TAILQ_INIT(&root->root_ready);
155: TAILQ_INIT(&root->root_unuse);
156:
157: #ifdef HAVE_LIBPTHREAD
158: for (i = 0; i < taskMAX; i++)
159: ROOT_QUNLOCK(root, i);
160: #endif
161:
162: if (data && *data) {
163: if (datlen) {
164: root->root_data.iov_base = *data;
165: root->root_data.iov_len = datlen;
166: } else { /* if datlen == 0, switch to callbacks init mode */
167: /* little hack :) for correct initialization of scheduler */
168: func = (int(*)(sched_root_task_t*)) data;
169: func(root);
170: }
171: }
172:
173: if (root->root_hooks.hook_root.init)
174: root->root_hooks.hook_root.init(root, NULL);
175: }
176:
177: return root;
178: }
179:
180: /*
181: * schedEnd() - End scheduler & free all resources
182: * @root = root task
183: * return: -1 error or 0 ok
184: */
185: int
186: schedEnd(sched_root_task_t ** __restrict root)
187: {
188: sched_task_t *task;
189: #ifdef HAVE_LIBPTHREAD
190: register int i;
191: #endif
192:
193: if (!root || !*root)
194: return -1;
195:
196: #ifdef HAVE_LIBPTHREAD
197: for (i = 0; i < taskMAX; i++)
198: ROOT_QLOCK(*root, i);
199: #endif
200: TAILQ_FOREACH(task, &(*root)->root_read, task_node) {
201: schedCancel(task);
202: }
203: TAILQ_FOREACH(task, &(*root)->root_write, task_node) {
204: schedCancel(task);
205: }
206: TAILQ_FOREACH(task, &(*root)->root_timer, task_node) {
207: schedCancel(task);
208: }
209: TAILQ_FOREACH(task, &(*root)->root_event, task_node) {
210: schedCancel(task);
211: }
212: TAILQ_FOREACH(task, &(*root)->root_ready, task_node) {
213: schedCancel(task);
214: }
215:
216: while ((task = TAILQ_FIRST(&(*root)->root_unuse))) {
217: TAILQ_REMOVE(&(*root)->root_unuse, task, task_node);
218: free(task);
219: }
220: #ifdef HAVE_LIBPTHREAD
221: for (i = 0; i < taskMAX; i++)
222: ROOT_QUNLOCK(*root, i);
223: #endif
224:
225: if ((*root)->root_hooks.hook_root.fini)
226: (*root)->root_hooks.hook_root.fini(*root, NULL);
227:
228: #ifdef HAVE_LIBPTHREAD
229: for (i = 0; i < taskMAX; i++)
230: pthread_mutex_destroy(&(*root)->root_mtx[i]);
231: #endif
232:
233: free(*root);
234: *root = NULL;
235: return 0;
236: }
237:
238: /*
239: * schedCall() - Call task execution function
240: * @task = current task
241: * return: !=NULL error or =NULL ok
242: */
243: inline void *
244: schedCall(sched_task_t * __restrict task)
245: {
246: void *ptr = (void*) -1;
247:
248: if (!task)
249: return ptr;
250:
251: if (!TASK_ISLOCKED(task))
252: TASK_LOCK(task);
253:
254: task->task_id++;
255: ptr = task->task_func(task);
256:
257: TASK_UNLOCK(task);
258: return ptr;
259: }
260:
261: /*
262: * schedFetch() - Fetch ready task
263: * @root = root task
264: * return: =NULL error or !=NULL ready task
265: */
266: inline void *
267: schedFetch(sched_root_task_t * __restrict root)
268: {
269: void *ptr;
270:
271: if (!root)
272: return NULL;
273:
274: if (root->root_hooks.hook_exec.fetch)
275: ptr = root->root_hooks.hook_exec.fetch(root, NULL);
276: else
277: ptr = NULL;
278:
279: return ptr;
280: }
281:
282: /*
283: * schedCancel() - Cancel task from scheduler
284: * @task = task
285: * return: -1 error or 0 ok
286: */
287: int
288: schedCancel(sched_task_t * __restrict task)
289: {
290: sched_queue_t *queue;
291:
292: if (!task || !task->task_root)
293: return -1;
294:
295: if (task->task_root->root_hooks.hook_exec.cancel)
296: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
297: return -1;
298:
299: switch (task->task_type) {
300: case taskREAD:
301: queue = &task->task_root->root_read;
302: break;
303: case taskWRITE:
304: queue = &task->task_root->root_write;
305: break;
306: case taskTIMER:
307: queue = &task->task_root->root_timer;
308: break;
309: case taskEVENT:
310: queue = &task->task_root->root_event;
311: break;
312: case taskREADY:
313: queue = &task->task_root->root_ready;
314: break;
315: default:
316: queue = NULL;
317: }
318: if (queue)
319: TAILQ_REMOVE(queue, task, task_node);
320: if (task->task_type != taskUNUSE)
321: _sched_unuseTask(task);
322:
323: return 0;
324: }
325:
326: /*
327: * schedCancelby() - Cancel task from scheduler by criteria
328: * @root = root task
329: * @queue = cancel from queue, if =NULL cancel same task from all queues
330: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
331: * @param = search parameter
332: * @hook = custom cleanup hook function, may be NULL
333: * return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
334: */
335: int
336: schedCancelby(sched_root_task_t * __restrict root, sched_queue_t * __restrict queue,
337: u_char criteria, void *param, sched_hook_func_t hook)
338: {
339: sched_task_t *task;
340: int flg = 0;
341:
342: if (!root)
343: return -1;
344: if (!queue) {
345: if (schedCancelby(root, &root->root_read, criteria, param, hook))
346: return -2;
347: if (schedCancelby(root, &root->root_write, criteria, param, hook))
348: return -2;
349: if (schedCancelby(root, &root->root_timer, criteria, param, hook))
350: return -2;
351: if (schedCancelby(root, &root->root_event, criteria, param, hook))
352: return -2;
353: if (schedCancelby(root, &root->root_ready, criteria, param, hook))
354: return -2;
355: if (schedCancelby(root, &root->root_read, criteria, param, hook))
356: return -2;
357: return 0;
358: }
359:
360: TAILQ_FOREACH(task, queue, task_node)
361: if (criteria == CRITERIA_CALL) {
362: if (task->task_func == (sched_task_func_t) param) {
363: flg++;
364: break;
365: }
366: } else if (criteria == CRITERIA_ARG) {
367: if (task->task_arg == param) {
368: flg++;
369: break;
370: }
371: } else if (criteria == CRITERIA_FD) {
372: if (TASK_FD(task) == (intptr_t) param) {
373: flg++;
374: break;
375: }
376: } else if (criteria == CRITERIA_VAL) {
377: if (TASK_VAL(task) == (u_long) param) {
378: flg++;
379: break;
380: }
381: } else if (criteria == CRITERIA_TV) {
382: if (!timercmp(&TASK_TV(task), (struct timeval*) param, -)) {
383: flg++;
384: break;
385: }
386: } else {
387: sched_SetErr(EINVAL, "Invalid parameter criteria %d", criteria);
388: return -1;
389: }
390: if (!flg || !task) /* task not found */
391: return 0;
392:
393: if (task->task_root->root_hooks.hook_exec.cancel)
394: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
395: return -1;
396: if (hook)
397: if (hook(task, NULL))
398: return -3;
399:
400: TAILQ_REMOVE(queue, task, task_node);
401:
402: if (task->task_type != taskUNUSE)
403: _sched_unuseTask(task);
404: return 0;
405: }
406:
407: /*
408: * schedRun() - Scheduler *run loop*
409: * @root = root task
410: * @killState = kill condition variable, if !=0 stop scheduler loop
411: * return: -1 error or 0 ok
412: */
413: int
414: schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState)
415: {
416: sched_task_t *task;
417:
418: if (!root)
419: return -1;
420:
421: if (root->root_hooks.hook_exec.run)
422: if (root->root_hooks.hook_exec.run(root, NULL))
423: return -1;
424: if (root->root_hooks.hook_exec.fetch) {
425: if (killState)
426: while (!*killState) {
427: if ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
428: schedCall(task);
429: }
430: else
431: while ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
432: schedCall(task);
433: }
434:
435: return 0;
436: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to aitsched.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / libaitsched / src