2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * NOTE! This file may be compiled for userland libraries as well as for
37 * $DragonFly: src/sys/kern/lwkt_msgport.c,v 1.47 2008/09/09 07:21:54 dillon Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
44 #include <sys/rtprio.h>
45 #include <sys/queue.h>
46 #include <sys/sysctl.h>
47 #include <sys/kthread.h>
48 #include <sys/signalvar.h>
49 #include <sys/signal2.h>
50 #include <machine/cpu.h>
54 #include <vm/vm_param.h>
55 #include <vm/vm_kern.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_map.h>
59 #include <vm/vm_pager.h>
60 #include <vm/vm_extern.h>
61 #include <vm/vm_zone.h>
63 #include <sys/thread2.h>
64 #include <sys/msgport2.h>
65 #include <sys/spinlock2.h>
66 #include <sys/serialize.h>
68 #include <machine/stdarg.h>
69 #include <machine/cpufunc.h>
71 #include <machine/smp.h>
74 #include <sys/malloc.h>
75 MALLOC_DEFINE(M_LWKTMSG, "lwkt message", "lwkt message");
77 /************************************************************************
79 ************************************************************************/
84 * Request asynchronous completion and call lwkt_beginmsg(). The
85 * target port can opt to execute the message synchronously or
86 * asynchronously and this function will automatically queue the
87 * response if the target executes the message synchronously.
89 * NOTE: The message is in an indeterminant state until this call
90 * returns. The caller should not mess with it (e.g. try to abort it)
94 lwkt_sendmsg(lwkt_port_t port, lwkt_msg_t msg)
98 KKASSERT(msg->ms_reply_port != NULL &&
99 (msg->ms_flags & (MSGF_DONE|MSGF_QUEUED)) == MSGF_DONE);
100 msg->ms_flags &= ~(MSGF_REPLY | MSGF_SYNC | MSGF_DONE);
101 if ((error = lwkt_beginmsg(port, msg)) != EASYNC) {
102 lwkt_replymsg(msg, error);
109 * Request asynchronous completion and call lwkt_beginmsg(). The
110 * target port can opt to execute the message synchronously or
111 * asynchronously and this function will automatically queue the
112 * response if the target executes the message synchronously.
115 lwkt_domsg(lwkt_port_t port, lwkt_msg_t msg, int flags)
119 KKASSERT(msg->ms_reply_port != NULL &&
120 (msg->ms_flags & (MSGF_DONE|MSGF_QUEUED)) == MSGF_DONE);
121 msg->ms_flags &= ~(MSGF_REPLY | MSGF_DONE);
122 msg->ms_flags |= MSGF_SYNC;
123 if ((error = lwkt_beginmsg(port, msg)) == EASYNC) {
124 error = lwkt_waitmsg(msg, flags);
126 msg->ms_flags |= MSGF_DONE | MSGF_REPLY;
134 * Forward a message received on one port to another port.
137 lwkt_forwardmsg(lwkt_port_t port, lwkt_msg_t msg)
142 KKASSERT((msg->ms_flags & (MSGF_QUEUED|MSGF_DONE|MSGF_REPLY)) == 0);
143 if ((error = port->mp_putport(port, msg)) != EASYNC)
144 lwkt_replymsg(msg, error);
152 * Attempt to abort a message. This only works if MSGF_ABORTABLE is set.
153 * The caller must ensure that the message will not be both replied AND
154 * destroyed while the abort is in progress.
156 * This function issues a callback which might block!
159 lwkt_abortmsg(lwkt_msg_t msg)
162 * A critical section protects us from reply IPIs on this cpu.
167 * Shortcut the operation if the message has already been returned.
168 * The callback typically constructs a lwkt_msg with the abort request,
169 * issues it synchronously, and waits for completion. The callback
170 * is not required to actually abort the message and the target port,
171 * upon receiving an abort request message generated by the callback
172 * should check whether the original message has already completed or
175 if (msg->ms_flags & MSGF_ABORTABLE) {
176 if ((msg->ms_flags & (MSGF_DONE|MSGF_REPLY)) == 0)
177 msg->ms_abortfn(msg);
182 /************************************************************************
183 * PORT INITIALIZATION API *
184 ************************************************************************/
186 static void *lwkt_thread_getport(lwkt_port_t port);
187 static int lwkt_thread_putport(lwkt_port_t port, lwkt_msg_t msg);
188 static int lwkt_thread_waitmsg(lwkt_msg_t msg, int flags);
189 static void *lwkt_thread_waitport(lwkt_port_t port, int flags);
190 static void lwkt_thread_replyport(lwkt_port_t port, lwkt_msg_t msg);
192 static void *lwkt_spin_getport(lwkt_port_t port);
193 static int lwkt_spin_putport(lwkt_port_t port, lwkt_msg_t msg);
194 static int lwkt_spin_waitmsg(lwkt_msg_t msg, int flags);
195 static void *lwkt_spin_waitport(lwkt_port_t port, int flags);
196 static void lwkt_spin_replyport(lwkt_port_t port, lwkt_msg_t msg);
198 static void *lwkt_serialize_getport(lwkt_port_t port);
199 static int lwkt_serialize_putport(lwkt_port_t port, lwkt_msg_t msg);
200 static int lwkt_serialize_waitmsg(lwkt_msg_t msg, int flags);
201 static void *lwkt_serialize_waitport(lwkt_port_t port, int flags);
202 static void lwkt_serialize_replyport(lwkt_port_t port, lwkt_msg_t msg);
204 static void lwkt_null_replyport(lwkt_port_t port, lwkt_msg_t msg);
205 static void *lwkt_panic_getport(lwkt_port_t port);
206 static int lwkt_panic_putport(lwkt_port_t port, lwkt_msg_t msg);
207 static int lwkt_panic_waitmsg(lwkt_msg_t msg, int flags);
208 static void *lwkt_panic_waitport(lwkt_port_t port, int flags);
209 static void lwkt_panic_replyport(lwkt_port_t port, lwkt_msg_t msg);
212 * Core port initialization (internal)
216 _lwkt_initport(lwkt_port_t port,
217 void *(*gportfn)(lwkt_port_t),
218 int (*pportfn)(lwkt_port_t, lwkt_msg_t),
219 int (*wmsgfn)(lwkt_msg_t, int),
220 void *(*wportfn)(lwkt_port_t, int),
221 void (*rportfn)(lwkt_port_t, lwkt_msg_t))
223 bzero(port, sizeof(*port));
224 TAILQ_INIT(&port->mp_msgq);
225 port->mp_getport = gportfn;
226 port->mp_putport = pportfn;
227 port->mp_waitmsg = wmsgfn;
228 port->mp_waitport = wportfn;
229 port->mp_replyport = rportfn;
233 * Schedule the target thread. If the message flags contains MSGF_NORESCHED
234 * we tell the scheduler not to reschedule if td is at a higher priority.
236 * This routine is called even if the thread is already scheduled so messages
237 * without NORESCHED will cause the target thread to be rescheduled even if
238 * prior messages did not.
242 _lwkt_schedule_msg(thread_t td, int flags)
244 if (flags & MSGF_NORESCHED)
245 lwkt_schedule_noresched(td);
251 * lwkt_initport_thread()
253 * Initialize a port for use by a particular thread. The port may
254 * only be used by <td>.
257 lwkt_initport_thread(lwkt_port_t port, thread_t td)
263 lwkt_thread_waitport,
264 lwkt_thread_replyport);
269 * lwkt_initport_spin()
271 * Initialize a port for use with descriptors that might be accessed
272 * via multiple LWPs, processes, or threads. Has somewhat more
273 * overhead then thread ports.
276 lwkt_initport_spin(lwkt_port_t port)
283 lwkt_spin_replyport);
284 spin_init(&port->mpu_spin);
288 lwkt_initport_serialize(lwkt_port_t port, struct lwkt_serialize *slz)
291 lwkt_serialize_getport,
292 lwkt_serialize_putport,
293 lwkt_serialize_waitmsg,
294 lwkt_serialize_waitport,
295 lwkt_serialize_replyport);
296 port->mpu_serialize = slz;
300 * Similar to the standard initport, this function simply marks the message
301 * as being done and does not attempt to return it to an originating port.
304 lwkt_initport_replyonly_null(lwkt_port_t port)
311 lwkt_null_replyport);
315 * Initialize a reply-only port, typically used as a message sink. Such
316 * ports can only be used as a reply port.
319 lwkt_initport_replyonly(lwkt_port_t port,
320 void (*rportfn)(lwkt_port_t, lwkt_msg_t))
322 _lwkt_initport(port, lwkt_panic_getport, lwkt_panic_putport,
323 lwkt_panic_waitmsg, lwkt_panic_waitport,
328 lwkt_initport_putonly(lwkt_port_t port,
329 int (*pportfn)(lwkt_port_t, lwkt_msg_t))
331 _lwkt_initport(port, lwkt_panic_getport, pportfn,
332 lwkt_panic_waitmsg, lwkt_panic_waitport,
333 lwkt_panic_replyport);
337 lwkt_initport_panic(lwkt_port_t port)
340 lwkt_panic_getport, lwkt_panic_putport,
341 lwkt_panic_waitmsg, lwkt_panic_waitport,
342 lwkt_panic_replyport);
348 * Retrieve the next message from the port's message queue, return NULL
349 * if no messages are pending. The retrieved message will either be a
350 * request or a reply based on the MSGF_REPLY bit.
352 * The calling thread MUST own the port.
357 _lwkt_pullmsg(lwkt_port_t port, lwkt_msg_t msg)
360 * normal case, remove and return the message.
362 TAILQ_REMOVE(&port->mp_msgq, msg, ms_node);
363 msg->ms_flags &= ~MSGF_QUEUED;
366 /************************************************************************
367 * THREAD PORT BACKEND *
368 ************************************************************************
370 * This backend is used when the port a message is retrieved from is owned
371 * by a single thread (the calling thread). Messages are IPId to the
372 * correct cpu before being enqueued to a port. Note that this is fairly
373 * optimal since scheduling would have had to do an IPI anyway if the
374 * message were headed to a different cpu.
380 * This function completes reply processing for the default case in the
381 * context of the originating cpu.
385 lwkt_thread_replyport_remote(lwkt_msg_t msg)
387 lwkt_port_t port = msg->ms_reply_port;
391 * Chase any thread migration that occurs
393 if (port->mpu_td->td_gd != mycpu) {
394 lwkt_send_ipiq(port->mpu_td->td_gd,
395 (ipifunc1_t)lwkt_thread_replyport_remote, msg);
403 KKASSERT(msg->ms_flags & MSGF_INTRANSIT);
404 msg->ms_flags &= ~MSGF_INTRANSIT;
406 flags = msg->ms_flags;
407 if (msg->ms_flags & MSGF_SYNC) {
409 msg->ms_flags |= MSGF_REPLY | MSGF_DONE;
411 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
412 msg->ms_flags |= MSGF_REPLY | MSGF_DONE | MSGF_QUEUED;
414 if (port->mp_flags & MSGPORTF_WAITING)
415 _lwkt_schedule_msg(port->mpu_td, flags);
421 * lwkt_thread_replyport() - Backend to lwkt_replymsg()
423 * Called with the reply port as an argument but in the context of the
424 * original target port. Completion must occur on the target port's
427 * The critical section protects us from IPIs on the this CPU.
430 lwkt_thread_replyport(lwkt_port_t port, lwkt_msg_t msg)
434 KKASSERT((msg->ms_flags & (MSGF_DONE|MSGF_QUEUED|MSGF_INTRANSIT)) == 0);
436 if (msg->ms_flags & MSGF_SYNC) {
438 * If a synchronous completion has been requested, just wakeup
439 * the message without bothering to queue it to the target port.
441 * Assume the target thread is non-preemptive, so no critical
442 * section is required.
445 if (port->mpu_td->td_gd == mycpu) {
447 flags = msg->ms_flags;
449 msg->ms_flags |= MSGF_DONE | MSGF_REPLY;
450 if (port->mp_flags & MSGPORTF_WAITING)
451 _lwkt_schedule_msg(port->mpu_td, flags);
455 msg->ms_flags |= MSGF_INTRANSIT;
457 msg->ms_flags |= MSGF_REPLY;
458 lwkt_send_ipiq(port->mpu_td->td_gd,
459 (ipifunc1_t)lwkt_thread_replyport_remote, msg);
464 * If an asynchronous completion has been requested the message
465 * must be queued to the reply port.
467 * A critical section is required to interlock the port queue.
470 if (port->mpu_td->td_gd == mycpu) {
473 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
474 msg->ms_flags |= MSGF_REPLY | MSGF_DONE | MSGF_QUEUED;
475 if (port->mp_flags & MSGPORTF_WAITING)
476 _lwkt_schedule_msg(port->mpu_td, msg->ms_flags);
481 msg->ms_flags |= MSGF_INTRANSIT;
483 msg->ms_flags |= MSGF_REPLY;
484 lwkt_send_ipiq(port->mpu_td->td_gd,
485 (ipifunc1_t)lwkt_thread_replyport_remote, msg);
492 * lwkt_thread_putport() - Backend to lwkt_beginmsg()
494 * Called with the target port as an argument but in the context of the
495 * reply port. This function always implements an asynchronous put to
496 * the target message port, and thus returns EASYNC.
498 * The message must already have cleared MSGF_DONE and MSGF_REPLY
505 lwkt_thread_putport_remote(lwkt_msg_t msg)
507 lwkt_port_t port = msg->ms_target_port;
510 * Chase any thread migration that occurs
512 if (port->mpu_td->td_gd != mycpu) {
513 lwkt_send_ipiq(port->mpu_td->td_gd,
514 (ipifunc1_t)lwkt_thread_putport_remote, msg);
522 KKASSERT(msg->ms_flags & MSGF_INTRANSIT);
523 msg->ms_flags &= ~MSGF_INTRANSIT;
525 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
526 msg->ms_flags |= MSGF_QUEUED;
527 if (port->mp_flags & MSGPORTF_WAITING)
528 _lwkt_schedule_msg(port->mpu_td, msg->ms_flags);
535 lwkt_thread_putport(lwkt_port_t port, lwkt_msg_t msg)
537 KKASSERT((msg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0);
539 msg->ms_target_port = port;
541 if (port->mpu_td->td_gd == mycpu) {
544 msg->ms_flags |= MSGF_QUEUED;
545 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
546 if (port->mp_flags & MSGPORTF_WAITING)
547 _lwkt_schedule_msg(port->mpu_td, msg->ms_flags);
552 msg->ms_flags |= MSGF_INTRANSIT;
554 lwkt_send_ipiq(port->mpu_td->td_gd,
555 (ipifunc1_t)lwkt_thread_putport_remote, msg);
562 * lwkt_thread_getport()
564 * Retrieve the next message from the port or NULL if no messages
568 lwkt_thread_getport(lwkt_port_t port)
572 KKASSERT(port->mpu_td == curthread);
574 crit_enter_quick(port->mpu_td);
575 if ((msg = TAILQ_FIRST(&port->mp_msgq)) != NULL)
576 _lwkt_pullmsg(port, msg);
577 crit_exit_quick(port->mpu_td);
582 * lwkt_thread_waitmsg()
584 * Wait for a particular message to be replied. We must be the only
585 * thread waiting on the message. The port must be owned by the
589 lwkt_thread_waitmsg(lwkt_msg_t msg, int flags)
591 if ((msg->ms_flags & MSGF_DONE) == 0) {
593 * If the done bit was not set we have to block until it is.
595 lwkt_port_t port = msg->ms_reply_port;
596 thread_t td = curthread;
599 KKASSERT(port->mpu_td == td);
600 crit_enter_quick(td);
603 while ((msg->ms_flags & MSGF_DONE) == 0) {
604 port->mp_flags |= MSGPORTF_WAITING;
605 if (sentabort == 0) {
606 if ((sentabort = lwkt_sleep("waitmsg", flags)) != 0) {
610 lwkt_sleep("waitabt", 0);
612 port->mp_flags &= ~MSGPORTF_WAITING;
614 if (msg->ms_flags & MSGF_QUEUED)
615 _lwkt_pullmsg(port, msg);
619 * If the done bit was set we only have to mess around with the
620 * message if it is queued on the reply port.
622 if (msg->ms_flags & MSGF_QUEUED) {
623 lwkt_port_t port = msg->ms_reply_port;
624 thread_t td = curthread;
626 KKASSERT(port->mpu_td == td);
627 crit_enter_quick(td);
628 _lwkt_pullmsg(port, msg);
632 return(msg->ms_error);
636 lwkt_thread_waitport(lwkt_port_t port, int flags)
638 thread_t td = curthread;
642 KKASSERT(port->mpu_td == td);
643 crit_enter_quick(td);
644 while ((msg = TAILQ_FIRST(&port->mp_msgq)) == NULL) {
645 port->mp_flags |= MSGPORTF_WAITING;
646 error = lwkt_sleep("waitport", flags);
647 port->mp_flags &= ~MSGPORTF_WAITING;
651 _lwkt_pullmsg(port, msg);
657 /************************************************************************
658 * SPIN PORT BACKEND *
659 ************************************************************************
661 * This backend uses spinlocks instead of making assumptions about which
662 * thread is accessing the port. It must be used when a port is not owned
663 * by a particular thread. This is less optimal then thread ports but
664 * you don't have a choice if there are multiple threads accessing the port.
666 * Note on MSGPORTF_WAITING - because there may be multiple threads blocked
667 * on the message port, it is the responsibility of the code doing the
668 * wakeup to clear this flag rather then the blocked threads. Some
669 * superfluous wakeups may occur, which is ok.
671 * XXX synchronous message wakeups are not current optimized.
676 lwkt_spin_getport(lwkt_port_t port)
680 spin_lock_wr(&port->mpu_spin);
681 if ((msg = TAILQ_FIRST(&port->mp_msgq)) != NULL)
682 _lwkt_pullmsg(port, msg);
683 spin_unlock_wr(&port->mpu_spin);
689 lwkt_spin_putport(lwkt_port_t port, lwkt_msg_t msg)
693 KKASSERT((msg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0);
695 msg->ms_target_port = port;
696 spin_lock_wr(&port->mpu_spin);
697 msg->ms_flags |= MSGF_QUEUED;
698 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
700 if (port->mp_flags & MSGPORTF_WAITING) {
701 port->mp_flags &= ~MSGPORTF_WAITING;
704 spin_unlock_wr(&port->mpu_spin);
712 lwkt_spin_waitmsg(lwkt_msg_t msg, int flags)
718 if ((msg->ms_flags & MSGF_DONE) == 0) {
719 port = msg->ms_reply_port;
721 spin_lock_wr(&port->mpu_spin);
722 while ((msg->ms_flags & MSGF_DONE) == 0) {
726 * If message was sent synchronously from the beginning
727 * the wakeup will be on the message structure, else it
728 * will be on the port structure.
730 if (msg->ms_flags & MSGF_SYNC) {
734 port->mp_flags |= MSGPORTF_WAITING;
738 * Only messages which support abort can be interrupted.
739 * We must still wait for message completion regardless.
741 if ((flags & PCATCH) && sentabort == 0) {
742 error = msleep(won, &port->mpu_spin, PCATCH, "waitmsg", 0);
745 spin_unlock_wr(&port->mpu_spin);
747 spin_lock_wr(&port->mpu_spin);
750 error = msleep(won, &port->mpu_spin, 0, "waitmsg", 0);
752 /* see note at the top on the MSGPORTF_WAITING flag */
755 * Turn EINTR into ERESTART if the signal indicates.
757 if (sentabort && msg->ms_error == EINTR)
758 msg->ms_error = sentabort;
759 if (msg->ms_flags & MSGF_QUEUED)
760 _lwkt_pullmsg(port, msg);
761 spin_unlock_wr(&port->mpu_spin);
763 if (msg->ms_flags & MSGF_QUEUED) {
764 port = msg->ms_reply_port;
765 spin_lock_wr(&port->mpu_spin);
766 _lwkt_pullmsg(port, msg);
767 spin_unlock_wr(&port->mpu_spin);
770 return(msg->ms_error);
775 lwkt_spin_waitport(lwkt_port_t port, int flags)
780 spin_lock_wr(&port->mpu_spin);
781 while ((msg = TAILQ_FIRST(&port->mp_msgq)) == NULL) {
782 port->mp_flags |= MSGPORTF_WAITING;
783 error = msleep(port, &port->mpu_spin, flags, "waitport", 0);
784 /* see note at the top on the MSGPORTF_WAITING flag */
786 spin_unlock_wr(&port->mpu_spin);
790 _lwkt_pullmsg(port, msg);
791 spin_unlock_wr(&port->mpu_spin);
797 lwkt_spin_replyport(lwkt_port_t port, lwkt_msg_t msg)
801 KKASSERT((msg->ms_flags & (MSGF_DONE|MSGF_QUEUED)) == 0);
803 if (msg->ms_flags & MSGF_SYNC) {
805 * If a synchronous completion has been requested, just wakeup
806 * the message without bothering to queue it to the target port.
808 msg->ms_flags |= MSGF_DONE | MSGF_REPLY;
812 * If an asynchronous completion has been requested the message
813 * must be queued to the reply port.
815 spin_lock_wr(&port->mpu_spin);
816 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
817 msg->ms_flags |= MSGF_REPLY | MSGF_DONE | MSGF_QUEUED;
819 if (port->mp_flags & MSGPORTF_WAITING) {
820 port->mp_flags &= ~MSGPORTF_WAITING;
823 spin_unlock_wr(&port->mpu_spin);
829 /************************************************************************
830 * SERIALIZER PORT BACKEND *
831 ************************************************************************
833 * This backend uses serializer to protect port accessing. Callers are
834 * assumed to have serializer held. This kind of port is usually created
835 * by network device driver along with _one_ lwkt thread to pipeline
836 * operations which may temporarily release serializer.
838 * Implementation is based on SPIN PORT BACKEND.
843 lwkt_serialize_getport(lwkt_port_t port)
847 ASSERT_SERIALIZED(port->mpu_serialize);
849 if ((msg = TAILQ_FIRST(&port->mp_msgq)) != NULL)
850 _lwkt_pullmsg(port, msg);
856 lwkt_serialize_putport(lwkt_port_t port, lwkt_msg_t msg)
858 KKASSERT((msg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0);
859 ASSERT_SERIALIZED(port->mpu_serialize);
861 msg->ms_target_port = port;
862 msg->ms_flags |= MSGF_QUEUED;
863 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
864 if (port->mp_flags & MSGPORTF_WAITING) {
865 port->mp_flags &= ~MSGPORTF_WAITING;
873 lwkt_serialize_waitmsg(lwkt_msg_t msg, int flags)
879 if ((msg->ms_flags & MSGF_DONE) == 0) {
880 port = msg->ms_reply_port;
882 ASSERT_SERIALIZED(port->mpu_serialize);
885 while ((msg->ms_flags & MSGF_DONE) == 0) {
889 * If message was sent synchronously from the beginning
890 * the wakeup will be on the message structure, else it
891 * will be on the port structure.
893 if (msg->ms_flags & MSGF_SYNC) {
897 port->mp_flags |= MSGPORTF_WAITING;
901 * Only messages which support abort can be interrupted.
902 * We must still wait for message completion regardless.
904 if ((flags & PCATCH) && sentabort == 0) {
905 error = serialize_sleep(won, port->mpu_serialize, PCATCH,
909 lwkt_serialize_exit(port->mpu_serialize);
911 lwkt_serialize_enter(port->mpu_serialize);
914 error = serialize_sleep(won, port->mpu_serialize, 0,
917 /* see note at the top on the MSGPORTF_WAITING flag */
920 * Turn EINTR into ERESTART if the signal indicates.
922 if (sentabort && msg->ms_error == EINTR)
923 msg->ms_error = sentabort;
924 if (msg->ms_flags & MSGF_QUEUED)
925 _lwkt_pullmsg(port, msg);
927 if (msg->ms_flags & MSGF_QUEUED) {
928 port = msg->ms_reply_port;
930 ASSERT_SERIALIZED(port->mpu_serialize);
931 _lwkt_pullmsg(port, msg);
934 return(msg->ms_error);
939 lwkt_serialize_waitport(lwkt_port_t port, int flags)
944 ASSERT_SERIALIZED(port->mpu_serialize);
946 while ((msg = TAILQ_FIRST(&port->mp_msgq)) == NULL) {
947 port->mp_flags |= MSGPORTF_WAITING;
948 error = serialize_sleep(port, port->mpu_serialize, flags,
950 /* see note at the top on the MSGPORTF_WAITING flag */
954 _lwkt_pullmsg(port, msg);
960 lwkt_serialize_replyport(lwkt_port_t port, lwkt_msg_t msg)
962 KKASSERT((msg->ms_flags & (MSGF_DONE|MSGF_QUEUED)) == 0);
963 ASSERT_SERIALIZED(port->mpu_serialize);
965 if (msg->ms_flags & MSGF_SYNC) {
967 * If a synchronous completion has been requested, just wakeup
968 * the message without bothering to queue it to the target port.
970 msg->ms_flags |= MSGF_DONE | MSGF_REPLY;
974 * If an asynchronous completion has been requested the message
975 * must be queued to the reply port.
977 TAILQ_INSERT_TAIL(&port->mp_msgq, msg, ms_node);
978 msg->ms_flags |= MSGF_REPLY | MSGF_DONE | MSGF_QUEUED;
979 if (port->mp_flags & MSGPORTF_WAITING) {
980 port->mp_flags &= ~MSGPORTF_WAITING;
986 /************************************************************************
987 * PANIC AND SPECIAL PORT FUNCTIONS *
988 ************************************************************************/
991 * You can point a port's reply vector at this function if you just want
992 * the message marked done, without any queueing or signaling. This is
993 * often used for structure-embedded messages.
997 lwkt_null_replyport(lwkt_port_t port, lwkt_msg_t msg)
999 msg->ms_flags |= MSGF_DONE | MSGF_REPLY;
1004 lwkt_panic_getport(lwkt_port_t port)
1006 panic("lwkt_getport() illegal on port %p", port);
1011 lwkt_panic_putport(lwkt_port_t port, lwkt_msg_t msg)
1013 panic("lwkt_begin/do/sendmsg() illegal on port %p msg %p", port, msg);
1018 lwkt_panic_waitmsg(lwkt_msg_t msg, int flags)
1020 panic("port %p msg %p cannot be waited on", msg->ms_reply_port, msg);
1025 lwkt_panic_waitport(lwkt_port_t port, int flags)
1027 panic("port %p cannot be waited on", port);
1032 lwkt_panic_replyport(lwkt_port_t port, lwkt_msg_t msg)
1034 panic("lwkt_replymsg() is illegal on port %p msg %p", port, msg);