Annotation of libaitsched/src/aitsched.c, revision 1.1.1.1.2.7
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 $
1.1.1.1.2.7! misho 6: * $Id: aitsched.c,v 1.1.1.1.2.6 2011/09/09 14:46:25 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: /*
1.1.1.1.2.1 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;
107:
108: root->root_hooks.hook_root.init = sched_hook_init;
109: root->root_hooks.hook_root.fini = sched_hook_fini;
110: return 0;
111: }
112:
113: /*
1.1 misho 114: * schedInit() - Init scheduler
115: * @data = optional data if !=NULL
116: * @datlen = data len if data is set
117: * return: allocated root task if ok or NULL error
118: */
119: sched_root_task_t *
120: schedInit(void ** __restrict data, size_t datlen)
121: {
122: sched_root_task_t *root = NULL;
123: int (*func)(sched_root_task_t *);
124:
125: root = malloc(sizeof(sched_root_task_t));
1.1.1.1.2.1 misho 126: if (!root) {
127: LOGERR;
128: } else {
1.1 misho 129: memset(root, 0, sizeof(sched_root_task_t));
1.1.1.1.2.2 misho 130: TAILQ_INIT(&root->root_read);
131: TAILQ_INIT(&root->root_write);
132: TAILQ_INIT(&root->root_timer);
133: TAILQ_INIT(&root->root_event);
134: TAILQ_INIT(&root->root_eventlo);
135: TAILQ_INIT(&root->root_ready);
136: TAILQ_INIT(&root->root_unuse);
1.1 misho 137:
138: if (data && *data) {
139: if (datlen) {
140: root->root_data.iov_base = *data;
141: root->root_data.iov_len = datlen;
142: } else {
1.1.1.1.2.2 misho 143: func = (int(*)(sched_root_task_t*)) data;
1.1 misho 144: func(root);
145: }
146: }
1.1.1.1.2.1 misho 147:
148: if (root->root_hooks.hook_root.init)
149: root->root_hooks.hook_root.init(root, NULL);
1.1 misho 150: }
151:
152: return root;
153: }
154:
155: /*
156: * schedEnd() - End scheduler & free all resources
157: * @root = root task
158: * return: -1 error or 0 ok
159: */
160: int
1.1.1.1.2.5 misho 161: schedEnd(sched_root_task_t ** __restrict root)
1.1 misho 162: {
163: sched_task_t *task;
164:
1.1.1.1.2.5 misho 165: if (!root || !*root)
1.1 misho 166: return -1;
167:
1.1.1.1.2.5 misho 168: TAILQ_FOREACH(task, &(*root)->root_read, task_node) {
1.1 misho 169: schedCancel(task);
170: }
1.1.1.1.2.5 misho 171: TAILQ_FOREACH(task, &(*root)->root_write, task_node) {
1.1 misho 172: schedCancel(task);
173: }
1.1.1.1.2.5 misho 174: TAILQ_FOREACH(task, &(*root)->root_timer, task_node) {
1.1 misho 175: schedCancel(task);
176: }
1.1.1.1.2.5 misho 177: TAILQ_FOREACH(task, &(*root)->root_event, task_node) {
1.1 misho 178: schedCancel(task);
179: }
1.1.1.1.2.5 misho 180: TAILQ_FOREACH(task, &(*root)->root_ready, task_node) {
1.1 misho 181: schedCancel(task);
182: }
183:
1.1.1.1.2.5 misho 184: while ((task = TAILQ_FIRST(&(*root)->root_unuse))) {
185: TAILQ_REMOVE(&(*root)->root_unuse, task, task_node);
1.1 misho 186: free(task);
187: }
188:
1.1.1.1.2.5 misho 189: if ((*root)->root_hooks.hook_root.fini)
190: (*root)->root_hooks.hook_root.fini(*root, NULL);
1.1 misho 191:
1.1.1.1.2.5 misho 192: free(*root);
193: *root = NULL;
1.1 misho 194: return 0;
195: }
196:
197: /*
198: * schedCall() - Call task execution function
199: * @task = current task
200: * return: !=NULL error or =NULL ok
201: */
202: inline void *
203: schedCall(sched_task_t * __restrict task)
204: {
205: if (!task)
206: return (void*) -1;
207:
208: task->task_id++;
209: return task->task_func(task);
210: }
211:
212: /*
213: * schedFetch() - Fetch ready task
214: * @root = root task
215: * return: =NULL error or !=NULL ready task
216: */
217: inline void *
218: schedFetch(sched_root_task_t * __restrict root)
219: {
220: void *ptr;
221:
222: if (!root)
223: return NULL;
224:
225: if (root->root_hooks.hook_exec.fetch)
226: ptr = root->root_hooks.hook_exec.fetch(root, NULL);
227: else
228: ptr = NULL;
229:
230: return ptr;
231: }
232:
233: /*
234: * schedCancel() - Cancel task from scheduler
235: * @task = task
236: * return: -1 error or 0 ok
237: */
238: int
239: schedCancel(sched_task_t * __restrict task)
240: {
241: sched_queue_t *queue;
242:
243: if (!task || !task->task_root)
244: return -1;
245:
246: if (task->task_root->root_hooks.hook_exec.cancel)
247: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
248: return -1;
249:
250: switch (task->task_type) {
251: case taskREAD:
252: queue = &task->task_root->root_read;
253: break;
254: case taskWRITE:
255: queue = &task->task_root->root_write;
256: break;
257: case taskTIMER:
258: queue = &task->task_root->root_timer;
259: break;
260: case taskEVENT:
261: queue = &task->task_root->root_event;
262: break;
263: case taskREADY:
264: queue = &task->task_root->root_ready;
265: break;
266: default:
267: queue = NULL;
268: }
269: if (queue)
270: TAILQ_REMOVE(queue, task, task_node);
271: if (task->task_type != taskUNUSE) {
272: task->task_type = taskUNUSE;
273: TAILQ_INSERT_TAIL(&task->task_root->root_unuse, task, task_node);
274: }
275:
276: return 0;
277: }
278:
279: /*
280: * schedCancelby() - Cancel task from scheduler by criteria
281: * @root = root task
282: * @queue = cancel from queue, if =NULL cancel same task from all queues
283: * @criteria = find task by criteria [CRITERIA_CALL|CRITERIA_ARG|CRITERIA_FD|CRITERIA_VAL|CRITERIA_TV]
284: * @param = search parameter
285: * @hook = custom cleanup hook function, may be NULL
286: * return: -1 error or 0 ok
287: */
288: int
289: schedCancelby(sched_root_task_t * __restrict root, sched_queue_t * __restrict queue,
290: u_char criteria, void *param, sched_hook_func_t hook)
291: {
292: sched_task_t *task;
293: int flg = 0;
294:
295: if (!root)
296: return -1;
297: if (!queue) {
298: if (schedCancelby(root, &root->root_read, criteria, param, hook))
299: return -2;
300: if (schedCancelby(root, &root->root_write, criteria, param, hook))
301: return -2;
302: if (schedCancelby(root, &root->root_timer, criteria, param, hook))
303: return -2;
304: if (schedCancelby(root, &root->root_event, criteria, param, hook))
305: return -2;
306: if (schedCancelby(root, &root->root_ready, criteria, param, hook))
307: return -2;
308: if (schedCancelby(root, &root->root_read, criteria, param, hook))
309: return -2;
310: return 0;
311: }
312:
313: TAILQ_FOREACH(task, queue, task_node)
314: if (criteria == CRITERIA_CALL) {
315: if (task->task_func == (sched_task_func_t) param) {
316: flg++;
317: break;
318: }
319: } else if (criteria == CRITERIA_ARG) {
320: if (task->task_arg == param) {
321: flg++;
322: break;
323: }
324: } else if (criteria == CRITERIA_FD) {
1.1.1.1.2.7! misho 325: if (TASK_FD(task) == (int) param) {
1.1 misho 326: flg++;
327: break;
328: }
329: } else if (criteria == CRITERIA_VAL) {
330: if (TASK_VAL(task) == (u_long) param) {
331: flg++;
332: break;
333: }
334: } else if (criteria == CRITERIA_TV) {
335: if (&TASK_TV(task) == (struct timeval*) param) {
336: flg++;
337: break;
338: }
339: } else {
340: sched_SetErr(EINVAL, "Invalid parameter criteria %d", criteria);
341: return -1;
342: }
343: if (!flg || !task) /* task not found */
344: return 0;
345:
346: if (task->task_root->root_hooks.hook_exec.cancel)
347: if (task->task_root->root_hooks.hook_exec.cancel(task, NULL))
348: return -1;
349: if (hook)
350: if (hook(task, NULL))
351: return -3;
352:
353: TAILQ_REMOVE(queue, task, task_node);
354:
355: if (task->task_type != taskUNUSE) {
356: task->task_type = taskUNUSE;
357: TAILQ_INSERT_TAIL(&task->task_root->root_unuse, task, task_node);
358: }
359: return 0;
360: }
361:
362: /*
363: * schedRun() - Scheduler *run loop*
364: * @root = root task
1.1.1.1.2.6 misho 365: * @killState = kill condition variable, if !=0 stop scheduler loop
1.1 misho 366: * return: -1 error or 0 ok
367: */
368: int
1.1.1.1.2.6 misho 369: schedRun(sched_root_task_t * __restrict root, volatile intptr_t * __restrict killState)
1.1 misho 370: {
371: sched_task_t *task;
372:
373: if (!root)
374: return -1;
375:
376: if (root->root_hooks.hook_exec.run)
377: if (root->root_hooks.hook_exec.run(root, NULL))
378: return -1;
1.1.1.1.2.6 misho 379: if (root->root_hooks.hook_exec.fetch) {
380: if (killState)
381: while (!*killState && (task = root->root_hooks.hook_exec.fetch(root, NULL)))
382: schedCall(task);
383: else
384: while ((task = root->root_hooks.hook_exec.fetch(root, NULL)))
385: schedCall(task);
386: }
1.1 misho 387:
388: return 0;
389: }
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