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hardware_samsung/ril/libril/ril_event.cpp

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