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 1.2.2.6 2011/12/01 00:02:55 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:
126: root = malloc(sizeof(sched_root_task_t));
127: if (!root) {
128: LOGERR;
129: } else {
130: memset(root, 0, sizeof(sched_root_task_t));
131: TAILQ_INIT(&root->root_read);
132: TAILQ_INIT(&root->root_write);
133: TAILQ_INIT(&root->root_timer);
134: TAILQ_INIT(&root->root_event);
135: TAILQ_INIT(&root->root_eventlo);
136: TAILQ_INIT(&root->root_ready);
137: TAILQ_INIT(&root->root_unuse);
138:
139: if (data && *data) {
140: if (datlen) {
141: root->root_data.iov_base = *data;
142: root->root_data.iov_len = datlen;
143: } else { /* if datlen == 0, switch to callbacks init mode */
144: /* little hack :) for correct initialization of scheduler */
145: func = (int(*)(sched_root_task_t*)) data;
146: func(root);
147: }
148: }
149:
150: if (root->root_hooks.hook_root.init)
151: root->root_hooks.hook_root.init(root, NULL);
152: }
153:
154: return root;
155: }
156:
157: /*
158: * schedEnd() - End scheduler & free all resources
159: * @root = root task
160: * return: -1 error or 0 ok
161: */
162: int
163: schedEnd(sched_root_task_t ** __restrict root)
164: {
165: sched_task_t *task;
166:
167: if (!root || !*root)
168: return -1;
169:
170: TAILQ_FOREACH(task, &(*root)->root_read, task_node) {
171: schedCancel(task);
172: }
173: TAILQ_FOREACH(task, &(*root)->root_write, task_node) {
174: schedCancel(task);
175: }
176: TAILQ_FOREACH(task, &(*root)->root_timer, task_node) {
177: schedCancel(task);
178: }
179: TAILQ_FOREACH(task, &(*root)->root_event, task_node) {
180: schedCancel(task);
181: }
182: TAILQ_FOREACH(task, &(*root)->root_ready, task_node) {
183: schedCancel(task);
184: }
185:
186: while ((task = TAILQ_FIRST(&(*root)->root_unuse))) {
187: TAILQ_REMOVE(&(*root)->root_unuse, task, task_node);
188: free(task);
189: }
190:
191: if ((*root)->root_hooks.hook_root.fini)
192: (*root)->root_hooks.hook_root.fini(*root, NULL);
193:
194: free(*root);
195: *root = NULL;
196: return 0;
197: }
198:
199: /*
200: * schedCall() - Call task execution function
201: * @task = current task
202: * return: !=NULL error or =NULL ok
203: */
204: inline void *
205: schedCall(sched_task_t * __restrict task)
206: {
207: if (!task)
208: return (void*) -1;
209:
210: task->task_id++;
211: return task->task_func(task);
212: }
213:
214: /*
215: * schedFetch() - Fetch ready task
216: * @root = root task
217: * return: =NULL error or !=NULL ready task
218: */
219: inline void *
220: schedFetch(sched_root_task_t * __restrict root)
221: {
222: void *ptr;
223:
224: if (!root)
225: return NULL;
226:
227: if (root->root_hooks.hook_exec.fetch)
228: ptr = root->root_hooks.hook_exec.fetch(root, NULL);
229: else
230: ptr = NULL;
231:
232: return ptr;
233: }
234:
235: /*
236: * schedCancel() - Cancel task from scheduler
237: * @task = task
238: * return: -1 error or 0 ok
239: */
240: int
241: schedCancel(sched_task_t * __restrict task)
242: {
243: sched_queue_t *queue;
244:
245: if (!task || !task->task_root)
246: return -1;
247:
248: if (task->task_root->root_hooks.hook_exec.cancel)
249: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
250: return -1;
251:
252: switch (task->task_type) {
253: case taskREAD:
254: queue = &task->task_root->root_read;
255: break;
256: case taskWRITE:
257: queue = &task->task_root->root_write;
258: break;
259: case taskTIMER:
260: queue = &task->task_root->root_timer;
261: break;
262: case taskEVENT:
263: queue = &task->task_root->root_event;
264: break;
265: case taskREADY:
266: queue = &task->task_root->root_ready;
267: break;
268: default:
269: queue = NULL;
270: }
271: if (queue)
272: TAILQ_REMOVE(queue, task, task_node);
273: if (task->task_type != taskUNUSE) {
274: task->task_type = taskUNUSE;
275: TAILQ_INSERT_TAIL(&task->task_root->root_unuse, task, task_node);
276: }
277:
278: return 0;
279: }
280:
281: /*
282: * schedCancelby() - Cancel task from scheduler by criteria
283: * @root = root task
284: * @queue = cancel from queue, if =NULL cancel same task from all queues
285: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
286: * @param = search parameter
287: * @hook = custom cleanup hook function, may be NULL
288: * return: -1 error, -2 error in sub-stage cancel execution, -3 error from custom hook or 0 ok
289: */
290: int
291: schedCancelby(sched_root_task_t * __restrict root, sched_queue_t * __restrict queue,
292: u_char criteria, void *param, sched_hook_func_t hook)
293: {
294: sched_task_t *task;
295: int flg = 0;
296:
297: if (!root)
298: return -1;
299: if (!queue) {
300: if (schedCancelby(root, &root->root_read, criteria, param, hook))
301: return -2;
302: if (schedCancelby(root, &root->root_write, criteria, param, hook))
303: return -2;
304: if (schedCancelby(root, &root->root_timer, criteria, param, hook))
305: return -2;
306: if (schedCancelby(root, &root->root_event, criteria, param, hook))
307: return -2;
308: if (schedCancelby(root, &root->root_ready, criteria, param, hook))
309: return -2;
310: if (schedCancelby(root, &root->root_read, criteria, param, hook))
311: return -2;
312: return 0;
313: }
314:
315: TAILQ_FOREACH(task, queue, task_node)
316: if (criteria == CRITERIA_CALL) {
317: if (task->task_func == (sched_task_func_t) param) {
318: flg++;
319: break;
320: }
321: } else if (criteria == CRITERIA_ARG) {
322: if (task->task_arg == param) {
323: flg++;
324: break;
325: }
326: } else if (criteria == CRITERIA_FD) {
327: if (TASK_FD(task) == (intptr_t) param) {
328: flg++;
329: break;
330: }
331: } else if (criteria == CRITERIA_VAL) {
332: if (TASK_VAL(task) == (u_long) param) {
333: flg++;
334: break;
335: }
336: } else if (criteria == CRITERIA_TV) {
337: if (!timercmp(&TASK_TV(task), (struct timeval*) param, -)) {
338: flg++;
339: break;
340: }
341: } else {
342: sched_SetErr(EINVAL, "Invalid parameter criteria %d", criteria);
343: return -1;
344: }
345: if (!flg || !task) /* task not found */
346: return 0;
347:
348: if (task->task_root->root_hooks.hook_exec.cancel)
349: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
350: return -1;
351: if (hook)
352: if (hook(task, NULL))
353: return -3;
354:
355: TAILQ_REMOVE(queue, task, task_node);
356:
357: if (task->task_type != taskUNUSE) {
358: task->task_type = taskUNUSE;
359: TAILQ_INSERT_TAIL(&task->task_root->root_unuse, task, task_node);
360: }
361: return 0;
362: }
363:
364: /*
365: * schedRun() - Scheduler *run loop*
366: * @root = root task
367: * @killState = kill condition variable, if !=0 stop scheduler loop
368: * return: -1 error or 0 ok
369: */
370: int
371: schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState)
372: {
373: sched_task_t *task;
374:
375: if (!root)
376: return -1;
377:
378: if (root->root_hooks.hook_exec.run)
379: if (root->root_hooks.hook_exec.run(root, NULL))
380: return -1;
381: if (root->root_hooks.hook_exec.fetch) {
382: if (killState)
383: while (!*killState) {
384: if ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
385: schedCall(task);
386: }
387: else
388: while ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
389: schedCall(task);
390: }
391:
392: return 0;
393: }
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