2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * An implementation of the rx socket listener for pthreads (not using select).
12 * This assumes that multiple read system calls may be extant at any given
13 * time. Also implements the pthread-specific event handling for rx.
15 * rx_pthread.c is used for the thread safe RX package.
18 #include <afsconfig.h>
19 #include <afs/param.h>
22 #include <sys/types.h>
27 # include <sys/socket.h>
28 # include <sys/file.h>
30 # include <netinet/in.h>
32 # include <sys/ioctl.h>
33 # include <sys/time.h>
38 #include <rx/rx_globals.h>
40 #include <rx/rx_pthread.h>
41 #include <rx/rx_clock.h>
44 * Number of times the event handling thread was signalled because a new
45 * event was scheduled earlier than the lastest event.
47 * Protected by event_handler_mutex
49 static long rx_pthread_n_event_wakeups;
51 /* Set rx_pthread_event_rescheduled if event_handler should just try
52 * again instead of sleeping.
54 * Protected by event_handler_mutex
56 static int rx_pthread_event_rescheduled = 0;
58 static void *rx_ListenerProc(void *);
61 * We supply an event handling thread for Rx's event processing.
62 * The condition variable is used to wakeup the thread whenever a new
63 * event is scheduled earlier than the previous earliest event.
64 * This thread is also responsible for keeping time.
66 static pthread_t event_handler_thread;
67 afs_kcondvar_t rx_event_handler_cond;
68 afs_kmutex_t event_handler_mutex;
69 afs_kcondvar_t rx_listener_cond;
70 afs_kmutex_t listener_mutex;
71 static int listeners_started = 0;
72 afs_kmutex_t rx_clock_mutex;
73 struct clock rxi_clockNow;
76 * Delay the current thread the specified number of seconds.
85 * Called from rx_Init()
88 rxi_InitializeThreadSupport(void)
90 /* listeners_started must only be reset if
91 * the listener thread terminates */
92 /* listeners_started = 0; */
93 clock_GetTime(&rxi_clockNow);
97 server_entry(void *argp)
99 void (*server_proc) (void *) = (void (*)(void *))argp;
101 dpf(("rx_pthread.c: server_entry: Server proc returned unexpectedly\n"));
107 * Start an Rx server process.
110 rxi_StartServerProc(void *(*proc) (void *), int stacksize)
113 pthread_attr_t tattr;
116 if (pthread_attr_init(&tattr) != 0) {
117 dpf(("Unable to Create Rx server thread (pthread_attr_init)\n"));
121 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
123 (("Unable to Create Rx server thread (pthread_attr_setdetachstate)\n"));
128 * NOTE: We are ignoring the stack size parameter, for now.
131 if (pthread_create(&thread, &tattr, server_entry, (void *)proc) != 0) {
132 dpf(("Unable to Create Rx server thread\n"));
135 AFS_SIGSET_RESTORE();
139 * The event handling process.
142 event_handler(void *argp)
144 struct clock rx_pthread_last_event_wait_time = { 0, 0 };
145 unsigned long rx_pthread_n_event_expired = 0;
146 unsigned long rx_pthread_n_event_waits = 0;
147 long rx_pthread_n_event_woken = 0;
148 unsigned long rx_pthread_n_event_error = 0;
149 struct timespec rx_pthread_next_event_time = { 0, 0 };
152 MUTEX_ENTER(&event_handler_mutex);
158 MUTEX_EXIT(&event_handler_mutex);
160 next.sec = 30; /* Time to sleep if there are no events scheduled */
163 rxevent_RaiseEvents(&next);
165 MUTEX_ENTER(&event_handler_mutex);
166 if (rx_pthread_event_rescheduled) {
167 rx_pthread_event_rescheduled = 0;
171 clock_Add(&cv, &next);
172 rx_pthread_next_event_time.tv_sec = cv.sec;
173 rx_pthread_next_event_time.tv_nsec = cv.usec * 1000;
174 rx_pthread_n_event_waits++;
175 error = CV_TIMEDWAIT(&rx_event_handler_cond, &event_handler_mutex, &rx_pthread_next_event_time);
177 rx_pthread_n_event_woken++;
180 else if (error == ETIMEDOUT) {
181 rx_pthread_n_event_expired++;
183 rx_pthread_n_event_error++;
186 else if (errno == ETIMEDOUT) {
187 rx_pthread_n_event_expired++;
189 rx_pthread_n_event_error++;
192 rx_pthread_event_rescheduled = 0;
199 * This routine will get called by the event package whenever a new,
200 * earlier than others, event is posted. */
202 rxi_ReScheduleEvents(void)
204 MUTEX_ENTER(&event_handler_mutex);
205 CV_SIGNAL(&rx_event_handler_cond);
206 rx_pthread_event_rescheduled = 1;
207 MUTEX_EXIT(&event_handler_mutex);
211 /* Loop to listen on a socket. Return setting *newcallp if this
212 * thread should become a server thread. */
214 rxi_ListenerProc(osi_socket sock, int *tnop, struct rx_call **newcallp)
218 struct rx_packet *p = (struct rx_packet *)0;
220 MUTEX_ENTER(&listener_mutex);
221 while (!listeners_started) {
222 CV_WAIT(&rx_listener_cond, &listener_mutex);
224 MUTEX_EXIT(&listener_mutex);
228 * Grab a new packet only if necessary (otherwise re-use the old one)
231 rxi_RestoreDataBufs(p);
233 if (!(p = rxi_AllocPacket(RX_PACKET_CLASS_RECEIVE))) {
234 /* Could this happen with multiple socket listeners? */
235 dpf(("rxi_Listener: no packets!")); /* Shouldn't happen */
240 if (rxi_ReadPacket(sock, p, &host, &port)) {
242 p = rxi_ReceivePacket(p, sock, host, port, tnop, newcallp);
243 if (newcallp && *newcallp) {
253 /* This is the listener process request loop. The listener process loop
254 * becomes a server thread when rxi_ListenerProc returns, and stays
255 * server thread until rxi_ServerProc returns. */
257 rx_ListenerProc(void *argp)
260 osi_socket sock = (osi_socket)argp;
261 struct rx_call *newcall;
266 rxi_ListenerProc(sock, &threadID, &newcall);
267 /* assert(threadID != -1); */
268 /* assert(newcall != NULL); */
269 sock = OSI_NULLSOCKET;
270 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
271 rxi_ServerProc(threadID, newcall, &sock);
272 /* assert(sock != OSI_NULLSOCKET); */
278 /* This is the server process request loop. The server process loop
279 * becomes a listener thread when rxi_ServerProc returns, and stays
280 * listener thread until rxi_ListenerProc returns. */
282 rx_ServerProc(void * dummy)
286 struct rx_call *newcall = NULL;
288 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
289 MUTEX_ENTER(&rx_quota_mutex);
290 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
291 /* threadID is used for making decisions in GetCall. Get it by bumping
292 * number of threads handling incoming calls */
293 /* Unique thread ID: used for scheduling purposes *and* as index into
294 * the host hold table (fileserver).
295 * The previously used rxi_availProcs is unsuitable as it
296 * will already go up and down as packets arrive while the server
297 * threads are still initialising! The recently introduced
298 * rxi_pthread_hinum does not necessarily lead to a server
299 * thread with id 0, which is not allowed to hop through the
300 * incoming call queue.
301 * So either introduce yet another counter or flag the FCFS
302 * thread... chose the latter.
304 MUTEX_ENTER(&rx_pthread_mutex);
305 threadID = ++rxi_pthread_hinum;
306 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
307 rxi_fcfs_thread_num = threadID;
308 MUTEX_EXIT(&rx_pthread_mutex);
310 MUTEX_EXIT(&rx_quota_mutex);
313 sock = OSI_NULLSOCKET;
314 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
315 rxi_ServerProc(threadID, newcall, &sock);
316 /* assert(sock != OSI_NULLSOCKET); */
318 rxi_ListenerProc(sock, &threadID, &newcall);
319 /* assert(threadID != -1); */
320 /* assert(newcall != NULL); */
327 * Historically used to start the listener process. We now have multiple
328 * listener processes (one for each socket); these are started by GetUdpSocket.
330 * The event handling process *is* started here (the old listener used
331 * to also handle events). The listener threads can't actually start
332 * listening until rxi_StartListener is called because most of R may not
333 * be initialized when rxi_Listen is called.
336 rxi_StartListener(void)
338 pthread_attr_t tattr;
341 if (listeners_started)
344 if (pthread_attr_init(&tattr) != 0) {
346 (("Unable to create Rx event handling thread (pthread_attr_init)\n"));
350 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
352 (("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n"));
357 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
359 dpf(("Unable to create Rx event handling thread\n"));
362 MUTEX_ENTER(&rx_pthread_mutex);
364 MUTEX_EXIT(&rx_pthread_mutex);
365 AFS_SIGSET_RESTORE();
367 MUTEX_ENTER(&listener_mutex);
368 CV_BROADCAST(&rx_listener_cond);
369 listeners_started = 1;
370 MUTEX_EXIT(&listener_mutex);
375 * Listen on the specified socket.
378 rxi_Listen(osi_socket sock)
381 pthread_attr_t tattr;
384 if (pthread_attr_init(&tattr) != 0) {
386 (("Unable to create socket listener thread (pthread_attr_init)\n"));
390 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
392 (("Unable to create socket listener thread (pthread_attr_setdetachstate)\n"));
397 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)sock) != 0) {
398 dpf(("Unable to create socket listener thread\n"));
401 MUTEX_ENTER(&rx_pthread_mutex);
403 MUTEX_EXIT(&rx_pthread_mutex);
404 AFS_SIGSET_RESTORE();
414 rxi_Recvmsg(osi_socket socket, struct msghdr *msg_p, int flags)
417 #if defined(HAVE_LINUX_ERRQUEUE_H) && defined(ADAPT_PMTU)
418 while((rxi_HandleSocketError(socket)) > 0)
421 ret = recvmsg(socket, msg_p, flags);
429 rxi_Sendmsg(osi_socket socket, struct msghdr *msg_p, int flags)
432 ret = sendmsg(socket, msg_p, flags);
433 #ifdef AFS_LINUX22_ENV
434 /* linux unfortunately returns ECONNREFUSED if the target port
435 * is no longer in use */
436 /* and EAGAIN if a UDP checksum is incorrect */
437 if (ret == -1 && errno != ECONNREFUSED && errno != EAGAIN) {
441 dpf(("rxi_sendmsg failed, error %d\n", errno));
448 struct rx_ts_info_t * rx_ts_info_init(void) {
449 struct rx_ts_info_t * rx_ts_info;
450 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
451 assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
452 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
453 #ifdef RX_ENABLE_TSFPQ
454 queue_Init(&rx_ts_info->_FPQ);
456 MUTEX_ENTER(&rx_packets_mutex);
458 RX_TS_FPQ_COMPUTE_LIMITS;
459 MUTEX_EXIT(&rx_packets_mutex);
460 #endif /* RX_ENABLE_TSFPQ */