1 /*
2 * Copyright (c) 2003-2004, 2007, 2009-2012 Proofpoint, Inc. and its suppliers.
3 * All rights reserved.
4 *
5 * By using this file, you agree to the terms and conditions set
6 * forth in the LICENSE file which can be found at the top level of
7 * the sendmail distribution.
8 *
9 * Contributed by Jose Marcio Martins da Cruz - Ecole des Mines de Paris
10 * Jose-Marcio.Martins@ensmp.fr
11 */
12
13 #include <sm/gen.h>
14 SM_RCSID("@(#)$Id: worker.c,v 8.25 2013-11-22 20:51:37 ca Exp $")
15
16 #include "libmilter.h"
17
18 #if _FFR_WORKERS_POOL
19
20 typedef struct taskmgr_S taskmgr_T;
21
22 #define TM_SIGNATURE 0x23021957
23
24 struct taskmgr_S
25 {
26 long tm_signature; /* has the controller been initialized */
27 sthread_t tm_tid; /* thread id of controller */
28 smfi_hd_T tm_ctx_head; /* head of the linked list of contexts */
29
30 int tm_nb_workers; /* number of workers in the pool */
31 int tm_nb_idle; /* number of workers waiting */
32
33 int tm_p[2]; /* poll control pipe */
34
35 smutex_t tm_w_mutex; /* linked list access mutex */
36 scond_t tm_w_cond; /* */
37 };
38
39 static taskmgr_T Tskmgr = {0};
40
41 #define WRK_CTX_HEAD Tskmgr.tm_ctx_head
42
43 #define RD_PIPE (Tskmgr.tm_p[0])
44 #define WR_PIPE (Tskmgr.tm_p[1])
45
46 #define PIPE_SEND_SIGNAL() \
47 do \
48 { \
49 char evt = 0x5a; \
50 int fd = WR_PIPE; \
51 if (write(fd, &evt, sizeof(evt)) != sizeof(evt)) \
52 smi_log(SMI_LOG_ERR, \
53 "Error writing to event pipe: %s", \
54 sm_errstring(errno)); \
55 } while (0)
56
57 #ifndef USE_PIPE_WAKE_POLL
58 # define USE_PIPE_WAKE_POLL 1
59 #endif
60
61 /* poll check periodicity (default 10000 - 10 s) */
62 #define POLL_TIMEOUT 10000
63
64 /* worker conditional wait timeout (default 10 s) */
65 #define COND_TIMEOUT 10
66
67 /* functions */
68 static int mi_close_session __P((SMFICTX_PTR));
69
70 static void *mi_worker __P((void *));
71 static void *mi_pool_controller __P((void *));
72
73 static int mi_list_add_ctx __P((SMFICTX_PTR));
74 static int mi_list_del_ctx __P((SMFICTX_PTR));
75
76 /*
77 ** periodicity of cleaning up old sessions (timedout)
78 ** sessions list will be checked to find old inactive
79 ** sessions each DT_CHECK_OLD_SESSIONS sec
80 */
81
82 #define DT_CHECK_OLD_SESSIONS 600
83
84 #ifndef OLD_SESSION_TIMEOUT
85 # define OLD_SESSION_TIMEOUT ctx->ctx_timeout
86 #endif
87
88 /* session states - with respect to the pool of workers */
89 #define WKST_INIT 0 /* initial state */
90 #define WKST_READY_TO_RUN 1 /* command ready do be read */
91 #define WKST_RUNNING 2 /* session running on a worker */
92 #define WKST_READY_TO_WAIT 3 /* session just finished by a worker */
93 #define WKST_WAITING 4 /* waiting for new command */
94 #define WKST_CLOSING 5 /* session finished */
95
96 #ifndef MIN_WORKERS
97 # define MIN_WORKERS 2 /* minimum number of threads to keep around */
98 #endif
99
100 #define MIN_IDLE 1 /* minimum number of idle threads */
101
102
103 /*
104 ** Macros for threads and mutex management
105 */
106
107 #define TASKMGR_LOCK() \
108 do \
109 { \
110 if (!smutex_lock(&Tskmgr.tm_w_mutex)) \
111 smi_log(SMI_LOG_ERR, "TASKMGR_LOCK error"); \
112 } while (0)
113
114 #define TASKMGR_UNLOCK() \
115 do \
116 { \
117 if (!smutex_unlock(&Tskmgr.tm_w_mutex)) \
118 smi_log(SMI_LOG_ERR, "TASKMGR_UNLOCK error"); \
119 } while (0)
120
121 #define TASKMGR_COND_WAIT() \
122 scond_timedwait(&Tskmgr.tm_w_cond, &Tskmgr.tm_w_mutex, COND_TIMEOUT)
123
124 #define TASKMGR_COND_SIGNAL() \
125 do \
126 { \
127 if (scond_signal(&Tskmgr.tm_w_cond) != 0) \
128 smi_log(SMI_LOG_ERR, "TASKMGR_COND_SIGNAL error"); \
129 } while (0)
130
131 #define LAUNCH_WORKER(ctx) \
132 do \
133 { \
134 int r; \
135 sthread_t tid; \
136 \
137 if ((r = thread_create(&tid, mi_worker, ctx)) != 0) \
138 smi_log(SMI_LOG_ERR, "LAUNCH_WORKER error: %s",\
139 sm_errstring(r)); \
140 } while (0)
141
142 #if POOL_DEBUG
143 # define POOL_LEV_DPRINTF(lev, x) \
144 do \
145 { \
146 if (ctx != NULL && (lev) < ctx->ctx_dbg) \
147 sm_dprintf x; \
148 } while (0)
149 #else /* POOL_DEBUG */
150 # define POOL_LEV_DPRINTF(lev, x)
151 #endif /* POOL_DEBUG */
152
153 /*
154 ** MI_START_SESSION -- Start a session in the pool of workers
155 **
156 ** Parameters:
157 ** ctx -- context structure
158 **
159 ** Returns:
160 ** MI_SUCCESS/MI_FAILURE
161 */
162
163 int
mi_start_session(ctx)164 mi_start_session(ctx)
165 SMFICTX_PTR ctx;
166 {
167 static long id = 0;
168
169 /* this can happen if the milter is shutting down */
170 if (Tskmgr.tm_signature != TM_SIGNATURE)
171 return MI_FAILURE;
172 SM_ASSERT(ctx != NULL);
173 POOL_LEV_DPRINTF(4, ("PIPE r=[%d] w=[%d]", RD_PIPE, WR_PIPE));
174 TASKMGR_LOCK();
175
176 if (mi_list_add_ctx(ctx) != MI_SUCCESS)
177 {
178 TASKMGR_UNLOCK();
179 return MI_FAILURE;
180 }
181
182 ctx->ctx_sid = id++;
183
184 /* if there is an idle worker, signal it, otherwise start new worker */
185 if (Tskmgr.tm_nb_idle > 0)
186 {
187 ctx->ctx_wstate = WKST_READY_TO_RUN;
188 TASKMGR_COND_SIGNAL();
189 }
190 else
191 {
192 ctx->ctx_wstate = WKST_RUNNING;
193 LAUNCH_WORKER(ctx);
194 }
195 TASKMGR_UNLOCK();
196 return MI_SUCCESS;
197 }
198
199 /*
200 ** MI_CLOSE_SESSION -- Close a session and clean up data structures
201 **
202 ** Parameters:
203 ** ctx -- context structure
204 **
205 ** Returns:
206 ** MI_SUCCESS/MI_FAILURE
207 */
208
209 static int
mi_close_session(ctx)210 mi_close_session(ctx)
211 SMFICTX_PTR ctx;
212 {
213 SM_ASSERT(ctx != NULL);
214
215 (void) mi_list_del_ctx(ctx);
216 mi_clr_ctx(ctx);
217
218 return MI_SUCCESS;
219 }
220
221 /*
222 ** NONBLOCKING -- set nonblocking mode for a file descriptor.
223 **
224 ** Parameters:
225 ** fd -- file descriptor
226 ** name -- name for (error) logging
227 **
228 ** Returns:
229 ** MI_SUCCESS/MI_FAILURE
230 */
231
232 static int
nonblocking(int fd,const char * name)233 nonblocking(int fd, const char *name)
234 {
235 int r;
236
237 errno = 0;
238 r = fcntl(fd, F_GETFL, 0);
239 if (r == -1)
240 {
241 smi_log(SMI_LOG_ERR, "fcntl(%s, F_GETFL)=%s",
242 name, sm_errstring(errno));
243 return MI_FAILURE;
244 }
245 errno = 0;
246 r = fcntl(fd, F_SETFL, r | O_NONBLOCK);
247 if (r == -1)
248 {
249 smi_log(SMI_LOG_ERR, "fcntl(%s, F_SETFL, O_NONBLOCK)=%s",
250 name, sm_errstring(errno));
251 return MI_FAILURE;
252 }
253 return MI_SUCCESS;
254 }
255
256 /*
257 ** MI_POOL_CONTROLLER_INIT -- Launch the worker pool controller
258 ** Must be called before starting sessions.
259 **
260 ** Parameters:
261 ** none
262 **
263 ** Returns:
264 ** MI_SUCCESS/MI_FAILURE
265 */
266
267 int
mi_pool_controller_init()268 mi_pool_controller_init()
269 {
270 sthread_t tid;
271 int r, i;
272
273 if (Tskmgr.tm_signature == TM_SIGNATURE)
274 return MI_SUCCESS;
275
276 SM_TAILQ_INIT(&WRK_CTX_HEAD);
277 Tskmgr.tm_tid = (sthread_t) -1;
278 Tskmgr.tm_nb_workers = 0;
279 Tskmgr.tm_nb_idle = 0;
280
281 if (pipe(Tskmgr.tm_p) != 0)
282 {
283 smi_log(SMI_LOG_ERR, "can't create event pipe: %s",
284 sm_errstring(errno));
285 return MI_FAILURE;
286 }
287 r = nonblocking(WR_PIPE, "WR_PIPE");
288 if (r != MI_SUCCESS)
289 return r;
290 r = nonblocking(RD_PIPE, "RD_PIPE");
291 if (r != MI_SUCCESS)
292 return r;
293
294 (void) smutex_init(&Tskmgr.tm_w_mutex);
295 (void) scond_init(&Tskmgr.tm_w_cond);
296
297 /* Launch the pool controller */
298 if ((r = thread_create(&tid, mi_pool_controller, (void *) NULL)) != 0)
299 {
300 smi_log(SMI_LOG_ERR, "can't create controller thread: %s",
301 sm_errstring(r));
302 return MI_FAILURE;
303 }
304 Tskmgr.tm_tid = tid;
305 Tskmgr.tm_signature = TM_SIGNATURE;
306
307 /* Create the pool of workers */
308 for (i = 0; i < MIN_WORKERS; i++)
309 {
310 if ((r = thread_create(&tid, mi_worker, (void *) NULL)) != 0)
311 {
312 smi_log(SMI_LOG_ERR, "can't create workers crew: %s",
313 sm_errstring(r));
314 return MI_FAILURE;
315 }
316 }
317
318 return MI_SUCCESS;
319 }
320
321 /*
322 ** MI_POOL_CONTROLLER -- manage the pool of workers
323 ** This thread must be running when listener begins
324 ** starting sessions
325 **
326 ** Parameters:
327 ** arg -- unused
328 **
329 ** Returns:
330 ** NULL
331 **
332 ** Control flow:
333 ** for (;;)
334 ** Look for timed out sessions
335 ** Select sessions to wait for sendmail command
336 ** Poll set of file descriptors
337 ** if timeout
338 ** continue
339 ** For each file descriptor ready
340 ** launch new thread if no worker available
341 ** else
342 ** signal waiting worker
343 */
344
345 /* Poll structure array (pollfd) size step */
346 #define PFD_STEP 256
347
348 #define WAIT_FD(i) (pfd[i].fd)
349 #define WAITFN "POLL"
350
351 static void *
mi_pool_controller(arg)352 mi_pool_controller(arg)
353 void *arg;
354 {
355 struct pollfd *pfd = NULL;
356 int dim_pfd = 0;
357 bool rebuild_set = true;
358 int pcnt = 0; /* error count for poll() failures */
359 time_t lastcheck;
360
361 Tskmgr.tm_tid = sthread_get_id();
362 if (pthread_detach(Tskmgr.tm_tid) != 0)
363 {
364 smi_log(SMI_LOG_ERR, "Failed to detach pool controller thread");
365 return NULL;
366 }
367
368 pfd = (struct pollfd *) malloc(PFD_STEP * sizeof(struct pollfd));
369 if (pfd == NULL)
370 {
371 smi_log(SMI_LOG_ERR, "Failed to malloc pollfd array: %s",
372 sm_errstring(errno));
373 return NULL;
374 }
375 dim_pfd = PFD_STEP;
376
377 lastcheck = time(NULL);
378 for (;;)
379 {
380 SMFICTX_PTR ctx;
381 int nfd, r, i;
382 time_t now;
383
384 if (mi_stop() != MILTER_CONT)
385 break;
386
387 TASKMGR_LOCK();
388
389 now = time(NULL);
390
391 /* check for timed out sessions? */
392 if (lastcheck + DT_CHECK_OLD_SESSIONS < now)
393 {
394 ctx = SM_TAILQ_FIRST(&WRK_CTX_HEAD);
395 while (ctx != SM_TAILQ_END(&WRK_CTX_HEAD))
396 {
397 SMFICTX_PTR ctx_nxt;
398
399 ctx_nxt = SM_TAILQ_NEXT(ctx, ctx_link);
400 if (ctx->ctx_wstate == WKST_WAITING)
401 {
402 if (ctx->ctx_wait == 0)
403 ctx->ctx_wait = now;
404 else if (ctx->ctx_wait + OLD_SESSION_TIMEOUT
405 < now)
406 {
407 /* if session timed out, close it */
408 sfsistat (*fi_close) __P((SMFICTX *));
409
410 POOL_LEV_DPRINTF(4,
411 ("Closing old connection: sd=%d id=%d",
412 ctx->ctx_sd,
413 ctx->ctx_sid));
414
415 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL)
416 (void) (*fi_close)(ctx);
417
418 mi_close_session(ctx);
419 }
420 }
421 ctx = ctx_nxt;
422 }
423 lastcheck = now;
424 }
425
426 if (rebuild_set)
427 {
428 /*
429 ** Initialize poll set.
430 ** Insert into the poll set the file descriptors of
431 ** all sessions waiting for a command from sendmail.
432 */
433
434 nfd = 0;
435
436 /* begin with worker pipe */
437 pfd[nfd].fd = RD_PIPE;
438 pfd[nfd].events = MI_POLL_RD_FLAGS;
439 pfd[nfd].revents = 0;
440 nfd++;
441
442 SM_TAILQ_FOREACH(ctx, &WRK_CTX_HEAD, ctx_link)
443 {
444 /*
445 ** update ctx_wait - start of wait moment -
446 ** for timeout
447 */
448
449 if (ctx->ctx_wstate == WKST_READY_TO_WAIT)
450 ctx->ctx_wait = now;
451
452 /* add the session to the pollfd array? */
453 if ((ctx->ctx_wstate == WKST_READY_TO_WAIT) ||
454 (ctx->ctx_wstate == WKST_WAITING))
455 {
456 /*
457 ** Resize the pollfd array if it
458 ** isn't large enough.
459 */
460
461 if (nfd >= dim_pfd)
462 {
463 struct pollfd *tpfd;
464 size_t new;
465
466 new = (dim_pfd + PFD_STEP) *
467 sizeof(*tpfd);
468 tpfd = (struct pollfd *)
469 realloc(pfd, new);
470 if (tpfd != NULL)
471 {
472 pfd = tpfd;
473 dim_pfd += PFD_STEP;
474 }
475 else
476 {
477 smi_log(SMI_LOG_ERR,
478 "Failed to realloc pollfd array:%s",
479 sm_errstring(errno));
480 }
481 }
482
483 /* add the session to pollfd array */
484 if (nfd < dim_pfd)
485 {
486 ctx->ctx_wstate = WKST_WAITING;
487 pfd[nfd].fd = ctx->ctx_sd;
488 pfd[nfd].events = MI_POLL_RD_FLAGS;
489 pfd[nfd].revents = 0;
490 nfd++;
491 }
492 }
493 }
494 rebuild_set = false;
495 }
496
497 TASKMGR_UNLOCK();
498
499 /* Everything is ready, let's wait for an event */
500 r = poll(pfd, nfd, POLL_TIMEOUT);
501
502 POOL_LEV_DPRINTF(4, ("%s returned: at epoch %d value %d",
503 WAITFN, now, nfd));
504
505 /* timeout */
506 if (r == 0)
507 continue;
508
509 rebuild_set = true;
510
511 /* error */
512 if (r < 0)
513 {
514 if (errno == EINTR)
515 continue;
516 pcnt++;
517 smi_log(SMI_LOG_ERR,
518 "%s() failed (%s), %s",
519 WAITFN, sm_errstring(errno),
520 pcnt >= MAX_FAILS_S ? "abort" : "try again");
521
522 if (pcnt >= MAX_FAILS_S)
523 goto err;
524 continue;
525 }
526 pcnt = 0;
527
528 /* something happened */
529 for (i = 0; i < nfd; i++)
530 {
531 if (pfd[i].revents == 0)
532 continue;
533
534 POOL_LEV_DPRINTF(4, ("%s event on pfd[%d/%d]=%d ",
535 WAITFN, i, nfd,
536 WAIT_FD(i)));
537
538 /* has a worker signaled an end of task? */
539 if (WAIT_FD(i) == RD_PIPE)
540 {
541 char evts[256];
542 ssize_t r;
543
544 POOL_LEV_DPRINTF(4,
545 ("PIPE WILL READ evt = %08X %08X",
546 pfd[i].events, pfd[i].revents));
547
548 r = 1;
549 while ((pfd[i].revents & MI_POLL_RD_FLAGS) != 0
550 && r != -1)
551 {
552 r = read(RD_PIPE, evts, sizeof(evts));
553 }
554
555 POOL_LEV_DPRINTF(4,
556 ("PIPE DONE READ i=[%d] fd=[%d] r=[%d] evt=[%d]",
557 i, RD_PIPE, (int) r, evts[0]));
558
559 if ((pfd[i].revents & ~MI_POLL_RD_FLAGS) != 0)
560 {
561 /* Exception handling */
562 }
563 continue;
564 }
565
566 /*
567 ** Not the pipe for workers waking us,
568 ** so must be something on an MTA connection.
569 */
570
571 TASKMGR_LOCK();
572 SM_TAILQ_FOREACH(ctx, &WRK_CTX_HEAD, ctx_link)
573 {
574 if (ctx->ctx_wstate != WKST_WAITING)
575 continue;
576
577 POOL_LEV_DPRINTF(4,
578 ("Checking context sd=%d - fd=%d ",
579 ctx->ctx_sd , WAIT_FD(i)));
580
581 if (ctx->ctx_sd == pfd[i].fd)
582 {
583
584 POOL_LEV_DPRINTF(4,
585 ("TASK: found %d for fd[%d]=%d",
586 ctx->ctx_sid, i, WAIT_FD(i)));
587
588 if (Tskmgr.tm_nb_idle > 0)
589 {
590 ctx->ctx_wstate = WKST_READY_TO_RUN;
591 TASKMGR_COND_SIGNAL();
592 }
593 else
594 {
595 ctx->ctx_wstate = WKST_RUNNING;
596 LAUNCH_WORKER(ctx);
597 }
598 break;
599 }
600 }
601 TASKMGR_UNLOCK();
602
603 POOL_LEV_DPRINTF(4,
604 ("TASK %s FOUND - Checking PIPE for fd[%d]",
605 ctx != NULL ? "" : "NOT", WAIT_FD(i)));
606 }
607 }
608
609 err:
610 if (pfd != NULL)
611 free(pfd);
612
613 Tskmgr.tm_signature = 0;
614 #if 0
615 /*
616 ** Do not clean up ctx -- it can cause double-free()s.
617 ** The program is shutting down anyway, so it's not worth the trouble.
618 ** There is a more complex solution that prevents race conditions
619 ** while accessing ctx, but that's maybe for a later version.
620 */
621
622 for (;;)
623 {
624 SMFICTX_PTR ctx;
625
626 ctx = SM_TAILQ_FIRST(&WRK_CTX_HEAD);
627 if (ctx == NULL)
628 break;
629 mi_close_session(ctx);
630 }
631 #endif
632
633 (void) smutex_destroy(&Tskmgr.tm_w_mutex);
634 (void) scond_destroy(&Tskmgr.tm_w_cond);
635
636 return NULL;
637 }
638
639 /*
640 ** Look for a task ready to run.
641 ** Value of ctx is NULL or a pointer to a task ready to run.
642 */
643
644 #define GET_TASK_READY_TO_RUN() \
645 SM_TAILQ_FOREACH(ctx, &WRK_CTX_HEAD, ctx_link) \
646 { \
647 if (ctx->ctx_wstate == WKST_READY_TO_RUN) \
648 { \
649 ctx->ctx_wstate = WKST_RUNNING; \
650 break; \
651 } \
652 }
653
654 /*
655 ** MI_WORKER -- worker thread
656 ** executes tasks distributed by the mi_pool_controller
657 ** or by mi_start_session
658 **
659 ** Parameters:
660 ** arg -- pointer to context structure
661 **
662 ** Returns:
663 ** NULL pointer
664 */
665
666 static void *
mi_worker(arg)667 mi_worker(arg)
668 void *arg;
669 {
670 SMFICTX_PTR ctx;
671 bool done;
672 sthread_t t_id;
673 int r;
674
675 ctx = (SMFICTX_PTR) arg;
676 done = false;
677 if (ctx != NULL)
678 ctx->ctx_wstate = WKST_RUNNING;
679
680 t_id = sthread_get_id();
681 if (pthread_detach(t_id) != 0)
682 {
683 smi_log(SMI_LOG_ERR, "Failed to detach worker thread");
684 if (ctx != NULL)
685 ctx->ctx_wstate = WKST_READY_TO_RUN;
686 return NULL;
687 }
688
689 TASKMGR_LOCK();
690 Tskmgr.tm_nb_workers++;
691 TASKMGR_UNLOCK();
692
693 while (!done)
694 {
695 if (mi_stop() != MILTER_CONT)
696 break;
697
698 /* let's handle next task... */
699 if (ctx != NULL)
700 {
701 int res;
702
703 POOL_LEV_DPRINTF(4,
704 ("worker %d: new task -> let's handle it",
705 t_id));
706 res = mi_engine(ctx);
707 POOL_LEV_DPRINTF(4,
708 ("worker %d: mi_engine returned %d", t_id, res));
709
710 TASKMGR_LOCK();
711 if (res != MI_CONTINUE)
712 {
713 ctx->ctx_wstate = WKST_CLOSING;
714
715 /*
716 ** Delete context from linked list of
717 ** sessions and close session.
718 */
719
720 mi_close_session(ctx);
721 }
722 else
723 {
724 ctx->ctx_wstate = WKST_READY_TO_WAIT;
725
726 POOL_LEV_DPRINTF(4,
727 ("writing to event pipe..."));
728
729 /*
730 ** Signal task controller to add new session
731 ** to poll set.
732 */
733
734 PIPE_SEND_SIGNAL();
735 }
736 TASKMGR_UNLOCK();
737 ctx = NULL;
738
739 }
740
741 /* check if there is any task waiting to be served */
742 TASKMGR_LOCK();
743
744 GET_TASK_READY_TO_RUN();
745
746 /* Got a task? */
747 if (ctx != NULL)
748 {
749 TASKMGR_UNLOCK();
750 continue;
751 }
752
753 /*
754 ** if not, let's check if there is enough idle workers
755 ** if yes: quit
756 */
757
758 if (Tskmgr.tm_nb_workers > MIN_WORKERS &&
759 Tskmgr.tm_nb_idle > MIN_IDLE)
760 done = true;
761
762 POOL_LEV_DPRINTF(4, ("worker %d: checking ... %d %d", t_id,
763 Tskmgr.tm_nb_workers, Tskmgr.tm_nb_idle + 1));
764
765 if (done)
766 {
767 POOL_LEV_DPRINTF(4, ("worker %d: quitting... ", t_id));
768 Tskmgr.tm_nb_workers--;
769 TASKMGR_UNLOCK();
770 continue;
771 }
772
773 /*
774 ** if no task ready to run, wait for another one
775 */
776
777 Tskmgr.tm_nb_idle++;
778 TASKMGR_COND_WAIT();
779 Tskmgr.tm_nb_idle--;
780
781 /* look for a task */
782 GET_TASK_READY_TO_RUN();
783
784 TASKMGR_UNLOCK();
785 }
786 return NULL;
787 }
788
789 /*
790 ** MI_LIST_ADD_CTX -- add new session to linked list
791 **
792 ** Parameters:
793 ** ctx -- context structure
794 **
795 ** Returns:
796 ** MI_FAILURE/MI_SUCCESS
797 */
798
799 static int
mi_list_add_ctx(ctx)800 mi_list_add_ctx(ctx)
801 SMFICTX_PTR ctx;
802 {
803 SM_ASSERT(ctx != NULL);
804 SM_TAILQ_INSERT_TAIL(&WRK_CTX_HEAD, ctx, ctx_link);
805 return MI_SUCCESS;
806 }
807
808 /*
809 ** MI_LIST_DEL_CTX -- remove session from linked list when finished
810 **
811 ** Parameters:
812 ** ctx -- context structure
813 **
814 ** Returns:
815 ** MI_FAILURE/MI_SUCCESS
816 */
817
818 static int
mi_list_del_ctx(ctx)819 mi_list_del_ctx(ctx)
820 SMFICTX_PTR ctx;
821 {
822 SM_ASSERT(ctx != NULL);
823 if (SM_TAILQ_EMPTY(&WRK_CTX_HEAD))
824 return MI_FAILURE;
825
826 SM_TAILQ_REMOVE(&WRK_CTX_HEAD, ctx, ctx_link);
827 return MI_SUCCESS;
828 }
829 #endif /* _FFR_WORKERS_POOL */
830