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>
45 #include "rx_atomic.h"
47 /* Set rx_pthread_event_rescheduled if event_handler should just try
48 * again instead of sleeping.
50 * Protected by event_handler_mutex
52 static int rx_pthread_event_rescheduled = 0;
54 static void *rx_ListenerProc(void *);
57 * We supply an event handling thread for Rx's event processing.
58 * The condition variable is used to wakeup the thread whenever a new
59 * event is scheduled earlier than the previous earliest event.
60 * This thread is also responsible for keeping time.
62 static pthread_t event_handler_thread;
63 afs_kcondvar_t rx_event_handler_cond;
64 afs_kmutex_t event_handler_mutex;
65 afs_kcondvar_t rx_listener_cond;
66 afs_kmutex_t listener_mutex;
67 static int listeners_started = 0;
68 afs_kmutex_t rx_clock_mutex;
69 struct clock rxi_clockNow;
71 static rx_atomic_t threadHiNum;
74 rx_NewThreadId(void) {
75 return rx_atomic_inc_and_read(&threadHiNum);
79 * Delay the current thread the specified number of seconds.
88 * Called from rx_Init()
91 rxi_InitializeThreadSupport(void)
93 /* listeners_started must only be reset if
94 * the listener thread terminates */
95 /* listeners_started = 0; */
96 clock_GetTime(&rxi_clockNow);
100 server_entry(void *argp)
102 void (*server_proc) (void *) = (void (*)(void *))argp;
104 dpf(("rx_pthread.c: server_entry: Server proc returned unexpectedly\n"));
105 return (void *) -1; /* reused as return value, see pthread(3) */
109 * Start an Rx server process.
112 rxi_StartServerProc(void *(*proc) (void *), int stacksize)
115 pthread_attr_t tattr;
118 if (pthread_attr_init(&tattr) != 0) {
119 dpf(("Unable to Create Rx server thread (pthread_attr_init)\n"));
123 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
125 (("Unable to Create Rx server thread (pthread_attr_setdetachstate)\n"));
130 * NOTE: We are ignoring the stack size parameter, for now.
133 if (pthread_create(&thread, &tattr, server_entry, (void *)proc) != 0) {
134 dpf(("Unable to Create Rx server thread\n"));
137 AFS_SIGSET_RESTORE();
141 * The event handling process.
144 event_handler(void *argp)
146 unsigned long rx_pthread_n_event_expired = 0;
147 unsigned long rx_pthread_n_event_waits = 0;
148 long rx_pthread_n_event_woken = 0;
149 unsigned long rx_pthread_n_event_error = 0;
150 struct timespec rx_pthread_next_event_time = { 0, 0 };
153 MUTEX_ENTER(&event_handler_mutex);
159 MUTEX_EXIT(&event_handler_mutex);
161 next.sec = 30; /* Time to sleep if there are no events scheduled */
164 rxevent_RaiseEvents(&next);
166 MUTEX_ENTER(&event_handler_mutex);
167 if (rx_pthread_event_rescheduled) {
168 rx_pthread_event_rescheduled = 0;
172 clock_Add(&cv, &next);
173 rx_pthread_next_event_time.tv_sec = cv.sec;
174 rx_pthread_next_event_time.tv_nsec = cv.usec * 1000;
175 rx_pthread_n_event_waits++;
176 error = CV_TIMEDWAIT(&rx_event_handler_cond, &event_handler_mutex, &rx_pthread_next_event_time);
178 rx_pthread_n_event_woken++;
181 else if (error == ETIMEDOUT) {
182 rx_pthread_n_event_expired++;
184 rx_pthread_n_event_error++;
187 else if (errno == ETIMEDOUT) {
188 rx_pthread_n_event_expired++;
190 rx_pthread_n_event_error++;
193 rx_pthread_event_rescheduled = 0;
200 * This routine will get called by the event package whenever a new,
201 * earlier than others, event is posted. */
203 rxi_ReScheduleEvents(void)
205 MUTEX_ENTER(&event_handler_mutex);
206 CV_SIGNAL(&rx_event_handler_cond);
207 rx_pthread_event_rescheduled = 1;
208 MUTEX_EXIT(&event_handler_mutex);
212 /* Loop to listen on a socket. Return setting *newcallp if this
213 * thread should become a server thread. */
215 rxi_ListenerProc(osi_socket sock, int *tnop, struct rx_call **newcallp)
219 struct rx_packet *p = (struct rx_packet *)0;
221 MUTEX_ENTER(&listener_mutex);
222 while (!listeners_started) {
223 CV_WAIT(&rx_listener_cond, &listener_mutex);
225 MUTEX_EXIT(&listener_mutex);
228 /* See if a check for additional packets was issued */
232 * Grab a new packet only if necessary (otherwise re-use the old one)
235 rxi_RestoreDataBufs(p);
237 if (!(p = rxi_AllocPacket(RX_PACKET_CLASS_RECEIVE))) {
238 /* Could this happen with multiple socket listeners? */
239 dpf(("rxi_Listener: no packets!")); /* Shouldn't happen */
244 if (rxi_ReadPacket(sock, p, &host, &port)) {
246 p = rxi_ReceivePacket(p, sock, host, port, tnop, newcallp);
247 if (newcallp && *newcallp) {
257 /* This is the listener process request loop. The listener process loop
258 * becomes a server thread when rxi_ListenerProc returns, and stays
259 * server thread until rxi_ServerProc returns. */
261 rx_ListenerProc(void *argp)
264 osi_socket sock = (osi_socket)(intptr_t)argp;
265 struct rx_call *newcall;
270 rxi_ListenerProc(sock, &threadID, &newcall);
271 /* assert(threadID != -1); */
272 /* assert(newcall != NULL); */
273 sock = OSI_NULLSOCKET;
274 assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
275 rxi_ServerProc(threadID, newcall, &sock);
276 /* assert(sock != OSI_NULLSOCKET); */
282 /* This is the server process request loop. The server process loop
283 * becomes a listener thread when rxi_ServerProc returns, and stays
284 * listener thread until rxi_ListenerProc returns. */
286 rx_ServerProc(void * dummy)
290 struct rx_call *newcall = NULL;
292 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
293 MUTEX_ENTER(&rx_quota_mutex);
294 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
295 /* threadID is used for making decisions in GetCall. Get it by bumping
296 * number of threads handling incoming calls */
297 /* Unique thread ID: used for scheduling purposes *and* as index into
298 * the host hold table (fileserver).
299 * The previously used rxi_availProcs is unsuitable as it
300 * will already go up and down as packets arrive while the server
301 * threads are still initialising! The recently introduced
302 * rxi_pthread_hinum does not necessarily lead to a server
303 * thread with id 0, which is not allowed to hop through the
304 * incoming call queue.
305 * So either introduce yet another counter or flag the FCFS
306 * thread... chose the latter.
308 MUTEX_ENTER(&rx_pthread_mutex);
309 threadID = rx_NewThreadId();
310 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
311 rxi_fcfs_thread_num = threadID;
312 MUTEX_EXIT(&rx_pthread_mutex);
314 MUTEX_EXIT(&rx_quota_mutex);
317 sock = OSI_NULLSOCKET;
318 assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
319 rxi_ServerProc(threadID, newcall, &sock);
320 /* assert(sock != OSI_NULLSOCKET); */
322 rxi_ListenerProc(sock, &threadID, &newcall);
323 /* assert(threadID != -1); */
324 /* assert(newcall != NULL); */
331 * Historically used to start the listener process. We now have multiple
332 * listener processes (one for each socket); these are started by GetUdpSocket.
334 * The event handling process *is* started here (the old listener used
335 * to also handle events). The listener threads can't actually start
336 * listening until rxi_StartListener is called because most of R may not
337 * be initialized when rxi_Listen is called.
340 rxi_StartListener(void)
342 pthread_attr_t tattr;
345 if (listeners_started)
348 if (pthread_attr_init(&tattr) != 0) {
350 (("Unable to create Rx event handling thread (pthread_attr_init)\n"));
354 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
356 (("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n"));
361 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
363 dpf(("Unable to create Rx event handling thread\n"));
367 AFS_SIGSET_RESTORE();
369 MUTEX_ENTER(&listener_mutex);
370 CV_BROADCAST(&rx_listener_cond);
371 listeners_started = 1;
372 MUTEX_EXIT(&listener_mutex);
377 * Listen on the specified socket.
380 rxi_Listen(osi_socket sock)
383 pthread_attr_t tattr;
386 if (pthread_attr_init(&tattr) != 0) {
388 (("Unable to create socket listener thread (pthread_attr_init)\n"));
392 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
394 (("Unable to create socket listener thread (pthread_attr_setdetachstate)\n"));
399 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)(intptr_t)sock) != 0) {
400 dpf(("Unable to create socket listener thread\n"));
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));
447 if (WSAGetLastError() > 0)
448 return -WSAGetLastError();
455 struct rx_ts_info_t * rx_ts_info_init(void) {
456 struct rx_ts_info_t * rx_ts_info;
457 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
458 assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
459 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
460 #ifdef RX_ENABLE_TSFPQ
461 queue_Init(&rx_ts_info->_FPQ);
463 MUTEX_ENTER(&rx_packets_mutex);
465 RX_TS_FPQ_COMPUTE_LIMITS;
466 MUTEX_EXIT(&rx_packets_mutex);
467 #endif /* RX_ENABLE_TSFPQ */