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 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 (*)())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 struct timespec rx_pthread_next_event_time = { 0, 0 };
150 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
156 assert(pthread_mutex_unlock(&event_handler_mutex) == 0);
158 next.sec = 30; /* Time to sleep if there are no events scheduled */
161 rxevent_RaiseEvents(&next);
163 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
164 if (rx_pthread_event_rescheduled) {
165 rx_pthread_event_rescheduled = 0;
169 clock_Add(&cv, &next);
170 rx_pthread_next_event_time.tv_sec = cv.sec;
171 rx_pthread_next_event_time.tv_nsec = cv.usec * 1000;
172 rx_pthread_n_event_waits++;
173 if (pthread_cond_timedwait
174 (&rx_event_handler_cond, &event_handler_mutex,
175 &rx_pthread_next_event_time) == -1) {
177 assert(errno == EAGAIN);
179 rx_pthread_n_event_expired++;
181 rx_pthread_n_event_woken++;
183 rx_pthread_event_rescheduled = 0;
189 * This routine will get called by the event package whenever a new,
190 * earlier than others, event is posted. */
192 rxi_ReScheduleEvents(void)
194 assert(pthread_mutex_lock(&event_handler_mutex) == 0);
195 pthread_cond_signal(&rx_event_handler_cond);
196 rx_pthread_event_rescheduled = 1;
197 assert(pthread_mutex_unlock(&event_handler_mutex) == 0);
201 /* Loop to listen on a socket. Return setting *newcallp if this
202 * thread should become a server thread. */
204 rxi_ListenerProc(int sock, int *tnop, struct rx_call **newcallp)
208 register struct rx_packet *p = (struct rx_packet *)0;
210 assert(pthread_mutex_lock(&listener_mutex) == 0);
211 while (!listeners_started) {
212 assert(pthread_cond_wait(&rx_listener_cond, &listener_mutex) == 0);
214 assert(pthread_mutex_unlock(&listener_mutex) == 0);
218 * Grab a new packet only if necessary (otherwise re-use the old one)
221 rxi_RestoreDataBufs(p);
223 if (!(p = rxi_AllocPacket(RX_PACKET_CLASS_RECEIVE))) {
224 /* Could this happen with multiple socket listeners? */
225 dpf(("rxi_Listener: no packets!")); /* Shouldn't happen */
230 if (rxi_ReadPacket(sock, p, &host, &port)) {
232 p = rxi_ReceivePacket(p, sock, host, port, tnop, newcallp);
233 if (newcallp && *newcallp) {
243 /* This is the listener process request loop. The listener process loop
244 * becomes a server thread when rxi_ListenerProc returns, and stays
245 * server thread until rxi_ServerProc returns. */
247 rx_ListenerProc(void *argp)
250 int sock = (int)argp;
251 struct rx_call *newcall;
256 rxi_ListenerProc(sock, &threadID, &newcall);
257 /* assert(threadID != -1); */
258 /* assert(newcall != NULL); */
259 sock = OSI_NULLSOCKET;
260 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
261 rxi_ServerProc(threadID, newcall, &sock);
262 /* assert(sock != OSI_NULLSOCKET); */
267 /* This is the server process request loop. The server process loop
268 * becomes a listener thread when rxi_ServerProc returns, and stays
269 * listener thread until rxi_ListenerProc returns. */
275 struct rx_call *newcall = NULL;
277 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
278 MUTEX_ENTER(&rx_stats_mutex);
279 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
280 /* threadID is used for making decisions in GetCall. Get it by bumping
281 * number of threads handling incoming calls */
282 /* Unique thread ID: used for scheduling purposes *and* as index into
283 * the host hold table (fileserver).
284 * The previously used rxi_availProcs is unsuitable as it
285 * will already go up and down as packets arrive while the server
286 * threads are still initialising! The recently introduced
287 * rxi_pthread_hinum does not necessarily lead to a server
288 * thread with id 0, which is not allowed to hop through the
289 * incoming call queue.
290 * So either introduce yet another counter or flag the FCFS
291 * thread... chose the latter.
293 threadID = ++rxi_pthread_hinum;
294 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
295 rxi_fcfs_thread_num = threadID;
297 MUTEX_EXIT(&rx_stats_mutex);
300 sock = OSI_NULLSOCKET;
301 assert(pthread_setspecific(rx_thread_id_key, (void *)threadID) == 0);
302 rxi_ServerProc(threadID, newcall, &sock);
303 /* assert(sock != OSI_NULLSOCKET); */
305 rxi_ListenerProc(sock, &threadID, &newcall);
306 /* assert(threadID != -1); */
307 /* assert(newcall != NULL); */
313 * Historically used to start the listener process. We now have multiple
314 * listener processes (one for each socket); these are started by GetUdpSocket.
316 * The event handling process *is* started here (the old listener used
317 * to also handle events). The listener threads can't actually start
318 * listening until rxi_StartListener is called because most of R may not
319 * be initialized when rxi_Listen is called.
322 rxi_StartListener(void)
324 pthread_attr_t tattr;
327 if (listeners_started)
330 if (pthread_attr_init(&tattr) != 0) {
332 (("Unable to create Rx event handling thread (pthread_attr_init)\n"));
336 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
338 (("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n"));
343 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
345 dpf(("Unable to create Rx event handling thread\n"));
348 MUTEX_ENTER(&rx_stats_mutex);
350 MUTEX_EXIT(&rx_stats_mutex);
351 AFS_SIGSET_RESTORE();
353 assert(pthread_mutex_lock(&listener_mutex) == 0);
354 assert(pthread_cond_broadcast(&rx_listener_cond) == 0);
355 listeners_started = 1;
356 assert(pthread_mutex_unlock(&listener_mutex) == 0);
361 * Listen on the specified socket.
364 rxi_Listen(osi_socket sock)
367 pthread_attr_t tattr;
370 if (pthread_attr_init(&tattr) != 0) {
372 (("Unable to create socket listener thread (pthread_attr_init)\n"));
376 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
378 (("Unable to create socket listener thread (pthread_attr_setdetachstate)\n"));
383 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)sock) != 0) {
384 dpf(("Unable to create socket listener thread\n"));
387 MUTEX_ENTER(&rx_stats_mutex);
389 MUTEX_EXIT(&rx_stats_mutex);
390 AFS_SIGSET_RESTORE();
400 rxi_Recvmsg(osi_socket socket, struct msghdr *msg_p, int flags)
403 ret = recvmsg(socket, msg_p, flags);
411 rxi_Sendmsg(osi_socket socket, struct msghdr *msg_p, int flags)
414 ret = sendmsg(socket, msg_p, flags);
415 #ifdef AFS_LINUX22_ENV
416 /* linux unfortunately returns ECONNREFUSED if the target port
417 * is no longer in use */
418 /* and EAGAIN if a UDP checksum is incorrect */
419 if (ret == -1 && errno != ECONNREFUSED && errno != EAGAIN) {
423 dpf(("rxi_sendmsg failed, error %d\n", errno));
430 struct rx_ts_info_t * rx_ts_info_init() {
431 register struct rx_ts_info_t * rx_ts_info;
432 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
433 assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
434 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
435 #ifdef RX_ENABLE_TSFPQ
436 queue_Init(&rx_ts_info->_FPQ);
438 MUTEX_ENTER(&rx_stats_mutex);
440 RX_TS_FPQ_COMPUTE_LIMITS;
441 MUTEX_EXIT(&rx_stats_mutex);
442 #endif /* RX_ENABLE_TSFPQ */