385 lines
9.8 KiB
C++
385 lines
9.8 KiB
C++
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/* //device/libs/telephony/ril_event.cpp
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**
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** Copyright 2008, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#define LOG_TAG "RILC"
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <utils/Log.h>
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#include <ril_event.h>
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#include <string.h>
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#include <sys/time.h>
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#include <time.h>
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#include <pthread.h>
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static pthread_mutex_t listMutex;
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#define MUTEX_ACQUIRE() pthread_mutex_lock(&listMutex)
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#define MUTEX_RELEASE() pthread_mutex_unlock(&listMutex)
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#define MUTEX_INIT() pthread_mutex_init(&listMutex, NULL)
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#define MUTEX_DESTROY() pthread_mutex_destroy(&listMutex)
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#ifndef timeradd
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#define timeradd(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (0)
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#endif
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#ifndef timercmp
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#define timercmp(a, b, op) \
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((a)->tv_sec == (b)->tv_sec \
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? (a)->tv_usec op (b)->tv_usec \
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: (a)->tv_sec op (b)->tv_sec)
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#endif
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#ifndef timersub
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#define timersub(a, b, res) \
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do { \
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(res)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
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(res)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
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if ((res)->tv_usec < 0) { \
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(res)->tv_usec += 1000000; \
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(res)->tv_sec -= 1; \
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} \
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} while(0);
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#endif
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static fd_set readFds;
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static int nfds = 0;
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static struct ril_event * watch_table[MAX_FD_EVENTS];
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static struct ril_event timer_list;
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static struct ril_event pending_list;
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#define DEBUG 0
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#if DEBUG
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#define dlog(x...) ALOGD( x )
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static void dump_event(struct ril_event * ev)
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{
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dlog("~~~~ Event %x ~~~~", (unsigned int)ev);
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dlog(" next = %x", (unsigned int)ev->next);
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dlog(" prev = %x", (unsigned int)ev->prev);
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dlog(" fd = %d", ev->fd);
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dlog(" pers = %d", ev->persist);
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dlog(" timeout = %ds + %dus", (int)ev->timeout.tv_sec, (int)ev->timeout.tv_usec);
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dlog(" func = %x", (unsigned int)ev->func);
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dlog(" param = %x", (unsigned int)ev->param);
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dlog("~~~~~~~~~~~~~~~~~~");
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}
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#else
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#define dlog(x...) do {} while(0)
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#define dump_event(x) do {} while(0)
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#endif
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static void getNow(struct timeval * tv)
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{
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#ifdef HAVE_POSIX_CLOCKS
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec/1000;
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#else
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gettimeofday(tv, NULL);
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#endif
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}
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static void init_list(struct ril_event * list)
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{
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memset(list, 0, sizeof(struct ril_event));
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list->next = list;
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list->prev = list;
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list->fd = -1;
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}
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static void addToList(struct ril_event * ev, struct ril_event * list)
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{
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ev->next = list;
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ev->prev = list->prev;
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ev->prev->next = ev;
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list->prev = ev;
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dump_event(ev);
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}
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static void removeFromList(struct ril_event * ev)
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{
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dlog("~~~~ Removing event ~~~~");
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dump_event(ev);
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ev->next->prev = ev->prev;
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ev->prev->next = ev->next;
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ev->next = NULL;
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ev->prev = NULL;
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}
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static void removeWatch(struct ril_event * ev, int index)
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{
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watch_table[index] = NULL;
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ev->index = -1;
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FD_CLR(ev->fd, &readFds);
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if (ev->fd+1 == nfds) {
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int n = 0;
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for (int i = 0; i < MAX_FD_EVENTS; i++) {
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struct ril_event * rev = watch_table[i];
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if ((rev != NULL) && (rev->fd > n)) {
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n = rev->fd;
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}
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}
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nfds = n + 1;
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dlog("~~~~ nfds = %d ~~~~", nfds);
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}
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}
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static void processTimeouts()
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{
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dlog("~~~~ +processTimeouts ~~~~");
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MUTEX_ACQUIRE();
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struct timeval now;
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struct ril_event * tev = timer_list.next;
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struct ril_event * next;
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getNow(&now);
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// walk list, see if now >= ev->timeout for any events
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dlog("~~~~ Looking for timers <= %ds + %dus ~~~~", (int)now.tv_sec, (int)now.tv_usec);
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while ((tev != &timer_list) && (timercmp(&now, &tev->timeout, >))) {
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// Timer expired
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dlog("~~~~ firing timer ~~~~");
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next = tev->next;
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removeFromList(tev);
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addToList(tev, &pending_list);
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tev = next;
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}
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MUTEX_RELEASE();
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dlog("~~~~ -processTimeouts ~~~~");
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}
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static void processReadReadies(fd_set * rfds, int n)
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{
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dlog("~~~~ +processReadReadies (%d) ~~~~", n);
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MUTEX_ACQUIRE();
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for (int i = 0; (i < MAX_FD_EVENTS) && (n > 0); i++) {
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struct ril_event * rev = watch_table[i];
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if (rev != NULL && FD_ISSET(rev->fd, rfds)) {
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addToList(rev, &pending_list);
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if (rev->persist == false) {
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removeWatch(rev, i);
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}
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n--;
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}
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}
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MUTEX_RELEASE();
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dlog("~~~~ -processReadReadies (%d) ~~~~", n);
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}
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static void firePending()
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{
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dlog("~~~~ +firePending ~~~~");
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struct ril_event * ev = pending_list.next;
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while (ev != &pending_list) {
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struct ril_event * next = ev->next;
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removeFromList(ev);
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ev->func(ev->fd, 0, ev->param);
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ev = next;
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}
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dlog("~~~~ -firePending ~~~~");
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}
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static int calcNextTimeout(struct timeval * tv)
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{
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struct ril_event * tev = timer_list.next;
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struct timeval now;
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getNow(&now);
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// Sorted list, so calc based on first node
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if (tev == &timer_list) {
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// no pending timers
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return -1;
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}
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dlog("~~~~ now = %ds + %dus ~~~~", (int)now.tv_sec, (int)now.tv_usec);
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dlog("~~~~ next = %ds + %dus ~~~~",
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(int)tev->timeout.tv_sec, (int)tev->timeout.tv_usec);
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if (timercmp(&tev->timeout, &now, >)) {
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timersub(&tev->timeout, &now, tv);
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} else {
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// timer already expired.
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tv->tv_sec = tv->tv_usec = 0;
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}
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return 0;
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}
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// Initialize internal data structs
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void ril_event_init()
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{
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MUTEX_INIT();
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FD_ZERO(&readFds);
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init_list(&timer_list);
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init_list(&pending_list);
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memset(watch_table, 0, sizeof(watch_table));
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}
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// Initialize an event
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void ril_event_set(struct ril_event * ev, int fd, bool persist, ril_event_cb func, void * param)
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{
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dlog("~~~~ ril_event_set %x ~~~~", (unsigned int)ev);
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memset(ev, 0, sizeof(struct ril_event));
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ev->fd = fd;
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ev->index = -1;
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ev->persist = persist;
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ev->func = func;
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ev->param = param;
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fcntl(fd, F_SETFL, O_NONBLOCK);
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}
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// Add event to watch list
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void ril_event_add(struct ril_event * ev)
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{
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dlog("~~~~ +ril_event_add ~~~~");
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MUTEX_ACQUIRE();
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for (int i = 0; i < MAX_FD_EVENTS; i++) {
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if (watch_table[i] == NULL) {
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watch_table[i] = ev;
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ev->index = i;
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dlog("~~~~ added at %d ~~~~", i);
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dump_event(ev);
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FD_SET(ev->fd, &readFds);
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if (ev->fd >= nfds) nfds = ev->fd+1;
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dlog("~~~~ nfds = %d ~~~~", nfds);
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break;
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}
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}
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MUTEX_RELEASE();
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dlog("~~~~ -ril_event_add ~~~~");
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}
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// Add timer event
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void ril_timer_add(struct ril_event * ev, struct timeval * tv)
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{
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dlog("~~~~ +ril_timer_add ~~~~");
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MUTEX_ACQUIRE();
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struct ril_event * list;
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if (tv != NULL) {
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// add to timer list
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list = timer_list.next;
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ev->fd = -1; // make sure fd is invalid
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struct timeval now;
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getNow(&now);
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timeradd(&now, tv, &ev->timeout);
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// keep list sorted
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while (timercmp(&list->timeout, &ev->timeout, < )
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&& (list != &timer_list)) {
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list = list->next;
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}
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// list now points to the first event older than ev
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addToList(ev, list);
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}
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MUTEX_RELEASE();
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dlog("~~~~ -ril_timer_add ~~~~");
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}
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// Remove event from watch or timer list
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void ril_event_del(struct ril_event * ev)
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{
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dlog("~~~~ +ril_event_del ~~~~");
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MUTEX_ACQUIRE();
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if (ev->index < 0 || ev->index >= MAX_FD_EVENTS) {
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MUTEX_RELEASE();
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return;
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}
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removeWatch(ev, ev->index);
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MUTEX_RELEASE();
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dlog("~~~~ -ril_event_del ~~~~");
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}
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#if DEBUG
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static void printReadies(fd_set * rfds)
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{
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for (int i = 0; (i < MAX_FD_EVENTS); i++) {
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struct ril_event * rev = watch_table[i];
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if (rev != NULL && FD_ISSET(rev->fd, rfds)) {
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dlog("DON: fd=%d is ready", rev->fd);
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}
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}
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}
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#else
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#define printReadies(rfds) do {} while(0)
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#endif
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void ril_event_loop()
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{
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int n;
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fd_set rfds;
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struct timeval tv;
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struct timeval * ptv;
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for (;;) {
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// make local copy of read fd_set
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memcpy(&rfds, &readFds, sizeof(fd_set));
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if (-1 == calcNextTimeout(&tv)) {
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// no pending timers; block indefinitely
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dlog("~~~~ no timers; blocking indefinitely ~~~~");
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ptv = NULL;
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} else {
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dlog("~~~~ blocking for %ds + %dus ~~~~", (int)tv.tv_sec, (int)tv.tv_usec);
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ptv = &tv;
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}
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printReadies(&rfds);
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n = select(nfds, &rfds, NULL, NULL, ptv);
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printReadies(&rfds);
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dlog("~~~~ %d events fired ~~~~", n);
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if (n < 0) {
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if (errno == EINTR) continue;
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ALOGE("ril_event: select error (%d)", errno);
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// bail?
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return;
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}
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// Check for timeouts
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processTimeouts();
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// Check for read-ready
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|
processReadReadies(&rfds, n);
|
||
|
|
// Fire away
|
||
|
|
firePending();
|
||
|
|
}
|
||
|
|
}
|