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>
24 #include <sys/types.h>
28 # include <sys/socket.h>
29 # include <sys/file.h>
31 # include <netinet/in.h>
33 # include <sys/ioctl.h>
34 # 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 pthread_cond_t rx_event_handler_cond;
68 pthread_mutex_t event_handler_mutex;
69 pthread_cond_t rx_listener_cond;
70 pthread_mutex_t listener_mutex;
71 static int listeners_started = 0;
72 pthread_mutex_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 = 0;
91 clock_GetTime(&rxi_clockNow);
95 server_entry(void *argp)
97 void (*server_proc) () = (void (*)())argp;
99 dpf(("rx_pthread.c: server_entry: Server proc returned unexpectedly\n"));
105 * Start an Rx server process.
108 rxi_StartServerProc(void (*proc) (void), int stacksize)
111 pthread_attr_t tattr;
114 if (pthread_attr_init(&tattr) != 0) {
115 dpf(("Unable to Create Rx server thread (pthread_attr_init)\n"));
119 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
121 (("Unable to Create Rx server thread (pthread_attr_setdetachstate)\n"));
126 * NOTE: We are ignoring the stack size parameter, for now.
129 if (pthread_create(&thread, &tattr, server_entry, (void *)proc) != 0) {
130 dpf(("Unable to Create Rx server thread\n"));
133 AFS_SIGSET_RESTORE();
137 * The event handling process.
140 event_handler(void *argp)
142 struct clock rx_pthread_last_event_wait_time = { 0, 0 };
143 unsigned long rx_pthread_n_event_expired = 0;
144 unsigned long rx_pthread_n_event_waits = 0;
145 long rx_pthread_n_event_woken = 0;
146 struct timespec rx_pthread_next_event_time = { 0, 0 };
148 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
154 assert(pthread_mutex_unlock(&event_handler_mutex) == 0);
156 next.sec = 30; /* Time to sleep if there are no events scheduled */
159 rxevent_RaiseEvents(&next);
161 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
162 if (rx_pthread_event_rescheduled) {
163 rx_pthread_event_rescheduled = 0;
167 clock_Add(&cv, &next);
168 rx_pthread_next_event_time.tv_sec = cv.sec;
169 rx_pthread_next_event_time.tv_nsec = cv.usec * 1000;
170 rx_pthread_n_event_waits++;
171 if (pthread_cond_timedwait
172 (&rx_event_handler_cond, &event_handler_mutex,
173 &rx_pthread_next_event_time) == -1) {
175 assert(errno == EAGAIN);
177 rx_pthread_n_event_expired++;
179 rx_pthread_n_event_woken++;
181 rx_pthread_event_rescheduled = 0;
187 * This routine will get called by the event package whenever a new,
188 * earlier than others, event is posted. */
190 rxi_ReScheduleEvents(void)
192 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
193 pthread_cond_signal(&rx_event_handler_cond);
194 rx_pthread_event_rescheduled = 1;
195 assert(pthread_mutex_unlock(&event_handler_mutex) == 0);
199 /* Loop to listen on a socket. Return setting *newcallp if this
200 * thread should become a server thread. */
202 rxi_ListenerProc(int sock, int *tnop, struct rx_call **newcallp)
204 struct sockaddr_storage saddr;
206 register struct rx_packet *p = (struct rx_packet *)0;
208 assert(pthread_mutex_lock(&listener_mutex) == 0);
209 while (!listeners_started) {
210 assert(pthread_cond_wait(&rx_listener_cond, &listener_mutex) == 0);
212 assert(pthread_mutex_unlock(&listener_mutex) == 0);
216 * Grab a new packet only if necessary (otherwise re-use the old one)
219 rxi_RestoreDataBufs(p);
221 if (!(p = rxi_AllocPacket(RX_PACKET_CLASS_RECEIVE))) {
222 /* Could this happen with multiple socket listeners? */
223 dpf(("rxi_Listener: no packets!")); /* Shouldn't happen */
228 slen = sizeof(saddr);
229 if (rxi_ReadPacket(sock, p, &saddr, &slen)) {
231 p = rxi_ReceivePacket(p, sock, &saddr, slen, tnop, newcallp);
232 if (newcallp && *newcallp) {
242 /* This is the listener process request loop. The listener process loop
243 * becomes a server thread when rxi_ListenerProc returns, and stays
244 * server thread until rxi_ServerProc returns. */
246 rx_ListenerProc(void *argp)
249 int sock = (int)argp;
250 struct rx_call *newcall;
255 rxi_ListenerProc(sock, &threadID, &newcall);
256 /* assert(threadID != -1); */
257 /* assert(newcall != NULL); */
258 sock = OSI_NULLSOCKET;
259 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
260 rxi_ServerProc(threadID, newcall, &sock);
261 /* assert(sock != OSI_NULLSOCKET); */
266 /* This is the server process request loop. The server process loop
267 * becomes a listener thread when rxi_ServerProc returns, and stays
268 * listener thread until rxi_ListenerProc returns. */
274 struct rx_call *newcall = NULL;
276 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
277 MUTEX_ENTER(&rx_stats_mutex);
278 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
279 /* threadID is used for making decisions in GetCall. Get it by bumping
280 * number of threads handling incoming calls */
281 /* Unique thread ID: used for scheduling purposes *and* as index into
282 * the host hold table (fileserver).
283 * The previously used rxi_availProcs is unsuitable as it
284 * will already go up and down as packets arrive while the server
285 * threads are still initialising! The recently introduced
286 * rxi_pthread_hinum does not necessarily lead to a server
287 * thread with id 0, which is not allowed to hop through the
288 * incoming call queue.
289 * So either introduce yet another counter or flag the FCFS
290 * thread... chose the latter.
292 threadID = ++rxi_pthread_hinum;
293 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
294 rxi_fcfs_thread_num = threadID;
296 MUTEX_EXIT(&rx_stats_mutex);
299 sock = OSI_NULLSOCKET;
300 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
301 rxi_ServerProc(threadID, newcall, &sock);
302 /* assert(sock != OSI_NULLSOCKET); */
304 rxi_ListenerProc(sock, &threadID, &newcall);
305 /* assert(threadID != -1); */
306 /* assert(newcall != NULL); */
312 * Historically used to start the listener process. We now have multiple
313 * listener processes (one for each socket); these are started by GetUdpSocket.
315 * The event handling process *is* started here (the old listener used
316 * to also handle events). The listener threads can't actually start
317 * listening until rxi_StartListener is called because most of R may not
318 * be initialized when rxi_Listen is called.
321 rxi_StartListener(void)
323 pthread_attr_t tattr;
326 if (pthread_attr_init(&tattr) != 0) {
328 (("Unable to create Rx event handling thread (pthread_attr_init)\n"));
332 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
334 (("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n"));
339 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
341 dpf(("Unable to create Rx event handling thread\n"));
344 MUTEX_ENTER(&rx_stats_mutex);
346 MUTEX_EXIT(&rx_stats_mutex);
347 AFS_SIGSET_RESTORE();
349 assert(pthread_mutex_lock(&listener_mutex) == 0);
350 assert(pthread_cond_broadcast(&rx_listener_cond) == 0);
351 listeners_started = 1;
352 assert(pthread_mutex_unlock(&listener_mutex) == 0);
357 * Listen on the specified socket.
360 rxi_Listen(osi_socket sock)
363 pthread_attr_t tattr;
366 if (pthread_attr_init(&tattr) != 0) {
368 (("Unable to create socket listener thread (pthread_attr_init)\n"));
372 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
374 (("Unable to create socket listener thread (pthread_attr_setdetachstate)\n"));
379 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)sock) != 0) {
380 dpf(("Unable to create socket listener thread\n"));
383 MUTEX_ENTER(&rx_stats_mutex);
385 MUTEX_EXIT(&rx_stats_mutex);
386 AFS_SIGSET_RESTORE();
396 rxi_Recvmsg(osi_socket socket, struct msghdr *msg_p, int flags)
399 ret = recvmsg(socket, msg_p, flags);
407 rxi_Sendmsg(osi_socket socket, struct msghdr *msg_p, int flags)
410 ret = sendmsg(socket, msg_p, flags);
411 #ifdef AFS_LINUX22_ENV
412 /* linux unfortunately returns ECONNREFUSED if the target port
413 * is no longer in use */
414 /* and EAGAIN if a UDP checksum is incorrect */
415 if (ret == -1 && errno != ECONNREFUSED && errno != EAGAIN) {
419 dpf(("rxi_sendmsg failed, error %d\n", errno));
426 struct rx_ts_info_t * rx_ts_info_init() {
427 register struct rx_ts_info_t * rx_ts_info;
428 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
429 assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
430 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
431 #ifdef RX_ENABLE_TSFPQ
432 queue_Init(&rx_ts_info->_FPQ);
434 MUTEX_ENTER(&rx_stats_mutex);
436 RX_TS_FPQ_COMPUTE_LIMITS;
437 MUTEX_EXIT(&rx_stats_mutex);
438 #endif /* RX_ENABLE_TSFPQ */