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>
30 # include <sys/socket.h>
31 # include <sys/file.h>
33 # include <netinet/in.h>
35 # include <sys/ioctl.h>
36 # include <sys/time.h>
41 #include <rx/rx_globals.h>
43 #include <rx/rx_pthread.h>
44 #include <rx/rx_clock.h>
46 /* Set rx_pthread_event_rescheduled if event_handler should just try
47 * again instead of sleeping.
49 * Protected by event_handler_mutex
51 static int rx_pthread_event_rescheduled = 0;
53 static void *rx_ListenerProc(void *);
56 * We supply an event handling thread for Rx's event processing.
57 * The condition variable is used to wakeup the thread whenever a new
58 * event is scheduled earlier than the previous earliest event.
59 * This thread is also responsible for keeping time.
61 static pthread_t event_handler_thread;
62 afs_kcondvar_t rx_event_handler_cond;
63 afs_kmutex_t event_handler_mutex;
64 afs_kcondvar_t rx_listener_cond;
65 afs_kmutex_t listener_mutex;
66 static int listeners_started = 0;
67 afs_kmutex_t rx_clock_mutex;
68 struct clock rxi_clockNow;
71 * Delay the current thread the specified number of seconds.
80 * Called from rx_Init()
83 rxi_InitializeThreadSupport(void)
85 /* listeners_started must only be reset if
86 * the listener thread terminates */
87 /* listeners_started = 0; */
88 clock_GetTime(&rxi_clockNow);
92 server_entry(void *argp)
94 void (*server_proc) (void *) = (void (*)(void *))argp;
96 dpf(("rx_pthread.c: server_entry: Server proc returned unexpectedly\n"));
97 return (void *) -1; /* reused as return value, see pthread(3) */
101 * Start an Rx server process.
104 rxi_StartServerProc(void *(*proc) (void *), int stacksize)
107 pthread_attr_t tattr;
110 if (pthread_attr_init(&tattr) != 0) {
111 dpf(("Unable to Create Rx server thread (pthread_attr_init)\n"));
115 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
117 (("Unable to Create Rx server thread (pthread_attr_setdetachstate)\n"));
122 * NOTE: We are ignoring the stack size parameter, for now.
125 if (pthread_create(&thread, &tattr, server_entry, (void *)proc) != 0) {
126 dpf(("Unable to Create Rx server thread\n"));
129 AFS_SIGSET_RESTORE();
133 * The event handling process.
136 event_handler(void *argp)
138 unsigned long rx_pthread_n_event_expired = 0;
139 unsigned long rx_pthread_n_event_waits = 0;
140 long rx_pthread_n_event_woken = 0;
141 unsigned long rx_pthread_n_event_error = 0;
142 struct timespec rx_pthread_next_event_time = { 0, 0 };
145 MUTEX_ENTER(&event_handler_mutex);
151 MUTEX_EXIT(&event_handler_mutex);
153 next.sec = 30; /* Time to sleep if there are no events scheduled */
156 rxevent_RaiseEvents(&next);
158 MUTEX_ENTER(&event_handler_mutex);
159 if (rx_pthread_event_rescheduled) {
160 rx_pthread_event_rescheduled = 0;
164 clock_Add(&cv, &next);
165 rx_pthread_next_event_time.tv_sec = cv.sec;
166 rx_pthread_next_event_time.tv_nsec = cv.usec * 1000;
167 rx_pthread_n_event_waits++;
168 error = CV_TIMEDWAIT(&rx_event_handler_cond, &event_handler_mutex, &rx_pthread_next_event_time);
170 rx_pthread_n_event_woken++;
173 else if (error == ETIMEDOUT) {
174 rx_pthread_n_event_expired++;
176 rx_pthread_n_event_error++;
179 else if (errno == ETIMEDOUT) {
180 rx_pthread_n_event_expired++;
182 rx_pthread_n_event_error++;
185 rx_pthread_event_rescheduled = 0;
192 * This routine will get called by the event package whenever a new,
193 * earlier than others, event is posted. */
195 rxi_ReScheduleEvents(void)
197 MUTEX_ENTER(&event_handler_mutex);
198 CV_SIGNAL(&rx_event_handler_cond);
199 rx_pthread_event_rescheduled = 1;
200 MUTEX_EXIT(&event_handler_mutex);
204 /* Loop to listen on a socket. Return setting *newcallp if this
205 * thread should become a server thread. */
207 rxi_ListenerProc(osi_socket sock, int *tnop, struct rx_call **newcallp)
211 struct rx_packet *p = (struct rx_packet *)0;
213 MUTEX_ENTER(&listener_mutex);
214 while (!listeners_started) {
215 CV_WAIT(&rx_listener_cond, &listener_mutex);
217 MUTEX_EXIT(&listener_mutex);
220 /* See if a check for additional packets was issued */
224 * Grab a new packet only if necessary (otherwise re-use the old one)
227 rxi_RestoreDataBufs(p);
229 if (!(p = rxi_AllocPacket(RX_PACKET_CLASS_RECEIVE))) {
230 /* Could this happen with multiple socket listeners? */
231 dpf(("rxi_Listener: no packets!")); /* Shouldn't happen */
236 if (rxi_ReadPacket(sock, p, &host, &port)) {
238 p = rxi_ReceivePacket(p, sock, host, port, tnop, newcallp);
239 if (newcallp && *newcallp) {
249 /* This is the listener process request loop. The listener process loop
250 * becomes a server thread when rxi_ListenerProc returns, and stays
251 * server thread until rxi_ServerProc returns. */
253 rx_ListenerProc(void *argp)
256 osi_socket sock = (osi_socket)(intptr_t)argp;
257 struct rx_call *newcall;
262 rxi_ListenerProc(sock, &threadID, &newcall);
263 /* assert(threadID != -1); */
264 /* assert(newcall != NULL); */
265 sock = OSI_NULLSOCKET;
266 assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
267 rxi_ServerProc(threadID, newcall, &sock);
268 /* assert(sock != OSI_NULLSOCKET); */
274 /* This is the server process request loop. The server process loop
275 * becomes a listener thread when rxi_ServerProc returns, and stays
276 * listener thread until rxi_ListenerProc returns. */
278 rx_ServerProc(void * dummy)
282 struct rx_call *newcall = NULL;
284 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
285 MUTEX_ENTER(&rx_quota_mutex);
286 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
287 /* threadID is used for making decisions in GetCall. Get it by bumping
288 * number of threads handling incoming calls */
289 /* Unique thread ID: used for scheduling purposes *and* as index into
290 * the host hold table (fileserver).
291 * The previously used rxi_availProcs is unsuitable as it
292 * will already go up and down as packets arrive while the server
293 * threads are still initialising! The recently introduced
294 * rxi_pthread_hinum does not necessarily lead to a server
295 * thread with id 0, which is not allowed to hop through the
296 * incoming call queue.
297 * So either introduce yet another counter or flag the FCFS
298 * thread... chose the latter.
300 MUTEX_ENTER(&rx_pthread_mutex);
301 threadID = ++rxi_pthread_hinum;
302 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
303 rxi_fcfs_thread_num = threadID;
304 MUTEX_EXIT(&rx_pthread_mutex);
306 MUTEX_EXIT(&rx_quota_mutex);
309 sock = OSI_NULLSOCKET;
310 assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
311 rxi_ServerProc(threadID, newcall, &sock);
312 /* assert(sock != OSI_NULLSOCKET); */
314 rxi_ListenerProc(sock, &threadID, &newcall);
315 /* assert(threadID != -1); */
316 /* assert(newcall != NULL); */
323 * Historically used to start the listener process. We now have multiple
324 * listener processes (one for each socket); these are started by GetUdpSocket.
326 * The event handling process *is* started here (the old listener used
327 * to also handle events). The listener threads can't actually start
328 * listening until rxi_StartListener is called because most of R may not
329 * be initialized when rxi_Listen is called.
332 rxi_StartListener(void)
334 pthread_attr_t tattr;
337 if (listeners_started)
340 if (pthread_attr_init(&tattr) != 0) {
342 (("Unable to create Rx event handling thread (pthread_attr_init)\n"));
346 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
348 (("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n"));
353 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
355 dpf(("Unable to create Rx event handling thread\n"));
358 MUTEX_ENTER(&rx_pthread_mutex);
360 MUTEX_EXIT(&rx_pthread_mutex);
361 AFS_SIGSET_RESTORE();
363 MUTEX_ENTER(&listener_mutex);
364 CV_BROADCAST(&rx_listener_cond);
365 listeners_started = 1;
366 MUTEX_EXIT(&listener_mutex);
371 * Listen on the specified socket.
374 rxi_Listen(osi_socket sock)
377 pthread_attr_t tattr;
380 if (pthread_attr_init(&tattr) != 0) {
382 (("Unable to create socket listener thread (pthread_attr_init)\n"));
386 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
388 (("Unable to create socket listener thread (pthread_attr_setdetachstate)\n"));
393 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)(intptr_t)sock) != 0) {
394 dpf(("Unable to create socket listener thread\n"));
397 MUTEX_ENTER(&rx_pthread_mutex);
399 MUTEX_EXIT(&rx_pthread_mutex);
400 AFS_SIGSET_RESTORE();
410 rxi_Recvmsg(osi_socket socket, struct msghdr *msg_p, int flags)
413 #if defined(HAVE_LINUX_ERRQUEUE_H) && defined(ADAPT_PMTU)
414 while((rxi_HandleSocketError(socket)) > 0)
417 ret = recvmsg(socket, msg_p, flags);
425 rxi_Sendmsg(osi_socket socket, struct msghdr *msg_p, int flags)
428 ret = sendmsg(socket, msg_p, flags);
429 #ifdef AFS_LINUX22_ENV
430 /* linux unfortunately returns ECONNREFUSED if the target port
431 * is no longer in use */
432 /* and EAGAIN if a UDP checksum is incorrect */
433 if (ret == -1 && errno != ECONNREFUSED && errno != EAGAIN) {
437 dpf(("rxi_sendmsg failed, error %d\n", errno));
443 if (WSAGetLastError() > 0)
444 return -WSAGetLastError();
451 struct rx_ts_info_t * rx_ts_info_init(void) {
452 struct rx_ts_info_t * rx_ts_info;
453 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
454 assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
455 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
456 #ifdef RX_ENABLE_TSFPQ
457 queue_Init(&rx_ts_info->_FPQ);
459 MUTEX_ENTER(&rx_packets_mutex);
461 RX_TS_FPQ_COMPUTE_LIMITS;
462 MUTEX_EXIT(&rx_packets_mutex);
463 #endif /* RX_ENABLE_TSFPQ */