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>
25 #include <sys/types.h>
33 # include <sys/socket.h>
34 # include <sys/file.h>
36 # include <netinet/in.h>
38 # include <sys/ioctl.h>
39 # include <sys/time.h>
46 #include "rx_globals.h"
47 #include "rx_pthread.h"
49 #include "rx_atomic.h"
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;
75 static rx_atomic_t threadHiNum;
78 rx_NewThreadId(void) {
79 return rx_atomic_inc_and_read(&threadHiNum);
83 * Delay the current thread the specified number of seconds.
92 * Called from rx_Init()
95 rxi_InitializeThreadSupport(void)
97 /* listeners_started must only be reset if
98 * the listener thread terminates */
99 /* listeners_started = 0; */
100 clock_GetTime(&rxi_clockNow);
104 server_entry(void *argp)
106 void (*server_proc) (void *) = (void (*)(void *))argp;
108 dpf(("rx_pthread.c: server_entry: Server proc returned unexpectedly\n"));
109 return (void *) -1; /* reused as return value, see pthread(3) */
113 * Start an Rx server process.
116 rxi_StartServerProc(void *(*proc) (void *), int stacksize)
119 pthread_attr_t tattr;
122 if (pthread_attr_init(&tattr) != 0) {
123 osi_Panic("Unable to Create Rx server thread (pthread_attr_init)\n");
126 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
127 osi_Panic("Unable to Create Rx server thread (pthread_attr_setdetachstate)\n");
131 * NOTE: We are ignoring the stack size parameter, for now.
134 if (pthread_create(&thread, &tattr, server_entry, (void *)proc) != 0) {
135 osi_Panic("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 osi_Panic("rxi_Listener: no packets!"); /* Shouldn't happen */
243 if (rxi_ReadPacket(sock, p, &host, &port)) {
245 p = rxi_ReceivePacket(p, sock, host, port, tnop, newcallp);
246 if (newcallp && *newcallp) {
256 /* This is the listener process request loop. The listener process loop
257 * becomes a server thread when rxi_ListenerProc returns, and stays
258 * server thread until rxi_ServerProc returns. */
260 rx_ListenerProc(void *argp)
263 osi_socket sock = (osi_socket)(intptr_t)argp;
264 struct rx_call *newcall;
269 rxi_ListenerProc(sock, &threadID, &newcall);
270 /* osi_Assert(threadID != -1); */
271 /* osi_Assert(newcall != NULL); */
272 sock = OSI_NULLSOCKET;
273 osi_Assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
274 rxi_ServerProc(threadID, newcall, &sock);
275 /* osi_Assert(sock != OSI_NULLSOCKET); */
281 /* This is the server process request loop. The server process loop
282 * becomes a listener thread when rxi_ServerProc returns, and stays
283 * listener thread until rxi_ListenerProc returns. */
285 rx_ServerProc(void * dummy)
289 struct rx_call *newcall = NULL;
291 rxi_MorePackets(rx_maxReceiveWindow + 2); /* alloc more packets */
292 MUTEX_ENTER(&rx_quota_mutex);
293 rxi_dataQuota += rx_initSendWindow; /* Reserve some pkts for hard times */
294 /* threadID is used for making decisions in GetCall. Get it by bumping
295 * number of threads handling incoming calls */
296 /* Unique thread ID: used for scheduling purposes *and* as index into
297 * the host hold table (fileserver).
298 * The previously used rxi_availProcs is unsuitable as it
299 * will already go up and down as packets arrive while the server
300 * threads are still initialising! The recently introduced
301 * rxi_pthread_hinum does not necessarily lead to a server
302 * thread with id 0, which is not allowed to hop through the
303 * incoming call queue.
304 * So either introduce yet another counter or flag the FCFS
305 * thread... chose the latter.
307 MUTEX_ENTER(&rx_pthread_mutex);
308 threadID = rx_NewThreadId();
309 if (rxi_fcfs_thread_num == 0 && rxi_fcfs_thread_num != threadID)
310 rxi_fcfs_thread_num = threadID;
311 MUTEX_EXIT(&rx_pthread_mutex);
313 MUTEX_EXIT(&rx_quota_mutex);
316 sock = OSI_NULLSOCKET;
317 osi_Assert(pthread_setspecific(rx_thread_id_key, (void *)(intptr_t)threadID) == 0);
318 rxi_ServerProc(threadID, newcall, &sock);
319 /* osi_Assert(sock != OSI_NULLSOCKET); */
321 rxi_ListenerProc(sock, &threadID, &newcall);
322 /* osi_Assert(threadID != -1); */
323 /* osi_Assert(newcall != NULL); */
330 * Historically used to start the listener process. We now have multiple
331 * listener processes (one for each socket); these are started by GetUdpSocket.
333 * The event handling process *is* started here (the old listener used
334 * to also handle events). The listener threads can't actually start
335 * listening until rxi_StartListener is called because most of R may not
336 * be initialized when rxi_Listen is called.
339 rxi_StartListener(void)
341 pthread_attr_t tattr;
344 if (listeners_started)
347 if (pthread_attr_init(&tattr) != 0) {
348 osi_Panic("Unable to create Rx event handling thread (pthread_attr_init)\n");
351 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
352 osi_Panic("Unable to create Rx event handling thread (pthread_attr_setdetachstate)\n");
356 if (pthread_create(&event_handler_thread, &tattr, event_handler, NULL) !=
358 osi_Panic("Unable to create Rx event handling thread\n");
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) {
381 osi_Panic("Unable to create socket listener thread (pthread_attr_init)\n");
384 if (pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED) != 0) {
385 osi_Panic("Unable to create socket listener thread (pthread_attr_setdetachstate)\n");
389 if (pthread_create(&thread, &tattr, rx_ListenerProc, (void *)(intptr_t)sock) != 0) {
390 osi_Panic("Unable to create socket listener thread\n");
393 AFS_SIGSET_RESTORE();
403 rxi_Recvmsg(osi_socket socket, struct msghdr *msg_p, int flags)
406 #if defined(HAVE_LINUX_ERRQUEUE_H) && defined(ADAPT_PMTU)
407 while((rxi_HandleSocketError(socket)) > 0)
410 ret = recvmsg(socket, msg_p, flags);
418 rxi_Sendmsg(osi_socket socket, struct msghdr *msg_p, int flags)
421 ret = sendmsg(socket, msg_p, flags);
422 #ifdef AFS_LINUX22_ENV
423 /* linux unfortunately returns ECONNREFUSED if the target port
424 * is no longer in use */
425 /* and EAGAIN if a UDP checksum is incorrect */
426 if (ret == -1 && errno != ECONNREFUSED && errno != EAGAIN) {
430 dpf(("rxi_sendmsg failed, error %d\n", errno));
436 if (WSAGetLastError() > 0)
437 return -WSAGetLastError();
444 struct rx_ts_info_t * rx_ts_info_init(void) {
445 struct rx_ts_info_t * rx_ts_info;
446 rx_ts_info = (rx_ts_info_t *) malloc(sizeof(rx_ts_info_t));
447 osi_Assert(rx_ts_info != NULL && pthread_setspecific(rx_ts_info_key, rx_ts_info) == 0);
448 memset(rx_ts_info, 0, sizeof(rx_ts_info_t));
449 #ifdef RX_ENABLE_TSFPQ
450 queue_Init(&rx_ts_info->_FPQ);
452 MUTEX_ENTER(&rx_packets_mutex);
454 RX_TS_FPQ_COMPUTE_LIMITS;
455 MUTEX_EXIT(&rx_packets_mutex);
456 #endif /* RX_ENABLE_TSFPQ */