static int _gpsdClientReadLoop(void)
// start gpsd client - loop forever
// return TRUE if main is exiting
{
int ret = 0;
// debug
//gps_enable_debug(3, stderr);
//gps_enable_debug(8, stderr);
// heart of the client
for (;;) {
GMUTEXLOCK(&_ais_list_mutex);
if (NULL == _ais_list) {
g_print("s52ais:_gpsdClientRead() no AIS list .. main exited .. terminate gpsRead thread\n");
ret = TRUE;
goto exit;
}
GMUTEXUNLOCK(&_ais_list_mutex);
if (FALSE == gps_waiting(&_gpsdata, 500*1000)) { // wait 0.5 sec (500*1000 uSec)
//g_print("s52ais:_gpsdClientRead():gps_waiting() timed out\n");
GMUTEXLOCK(&_ais_list_mutex);
_updateTimeTag();
GMUTEXUNLOCK(&_ais_list_mutex);
} else {
errno = 0;
ret = gps_read(&_gpsdata);
if (0 < ret) {
// no error
//g_print("s52ais:_gpsdClientRead():gps_read() ..\n");
// handle AIS data
GMUTEXLOCK(&_ais_list_mutex);
_updateAISdata(&_gpsdata);
GMUTEXUNLOCK(&_ais_list_mutex);
continue;
}
if (0 == ret) {
g_print("s52ais:_gpsdClientRead():gps_read(): NO DATA .. [ret=0, errno=%i]\n", errno);
continue;
} else {
g_print("s52ais:_gpsdClientRead():gps_read(): socket error 4 .. GPSD died [ret=%i, errno=%i]\n", ret, errno);
goto exit;
}
}
}
exit:
// exit thread
GMUTEXUNLOCK(&_ais_list_mutex);
return ret;
}
static gpointer _gpsdClientRead(gpointer dummy)
// start gpsd client - loop forever
// return if _ais_list is NULL or 10 failed attempt to connect
{
int nWait = 0;
g_print("s52ais:_gpsdClientRead(): start looping ..\n");
__builtin_bzero(&_gpsdata, sizeof(_gpsdata));
//*
while (0 != gps_open(GPSD_HOST, GPSD_PORT, &_gpsdata)) { // android (gpsd 2.96)
g_print("s52ais:_gpsdClientRead(): no gpsd running or network error, wait 1 sec: %d, %s\n", errno, gps_errstr(errno));
// try to connect to GPSD server, bailout after 10 failed attempt
g_static_mutex_lock(&_ais_list_mutex);
if ((NULL==_ais_list) || (10 <= ++nWait)) {
g_print("s52ais:_gpsdClientRead() no AIS list (main exited) or no GPSD server.. terminate _gpsClientRead thread\n");
g_static_mutex_unlock(&_ais_list_mutex);
return NULL;
}
g_static_mutex_unlock(&_ais_list_mutex);
g_usleep(1000 * 1000); // 1.0 sec
}
if (-1 == gps_stream(&_gpsdata, WATCH_ENABLE|WATCH_NEWSTYLE, NULL)) {
g_print("s52ais:_gpsdClientRead():gps_stream() failed .. exiting\n");
return NULL;
}
//*/
// debug
//gps_enable_debug(3, stderr);
//gps_enable_debug(8, stderr);
// heart of the client
for (;;) {
g_static_mutex_lock(&_ais_list_mutex);
if (NULL == _ais_list) {
g_print("s52ais:_gpsdClientRead() no AIS list .. main exited .. terminate gpsRead thread\n");
goto exit;
}
g_static_mutex_unlock(&_ais_list_mutex);
if (FALSE == gps_waiting(&_gpsdata, 500*1000)) { // wait 0.5 sec (500*1000 uSec)
//g_print("s52ais:_gpsdClientRead():gps_waiting() timed out\n");
g_static_mutex_lock(&_ais_list_mutex);
_updateTimeTag();
g_static_mutex_unlock(&_ais_list_mutex);
} else {
errno = 0;
int ret = gps_read(&_gpsdata);
if (0 < ret) {
// no error
//g_print("s52ais:_gpsdClientRead():gps_read() ..\n");
// handle AIS data
g_static_mutex_lock(&_ais_list_mutex);
_updateAISdata(&_gpsdata);
g_static_mutex_unlock(&_ais_list_mutex);
continue;
}
if (0 == ret) {
g_print("s52ais:_gpsdClientRead():gps_read(): NO DATA .. [ret=0, errno=%i]\n", errno);
continue;
} else {
g_print("s52ais:_gpsdClientRead():gps_read(): socket error 4 .. GPSD died [ret=%i, errno=%i]\n", ret, errno);
goto exit;
}
}
}
exit:
// exit thread
g_static_mutex_unlock(&_ais_list_mutex);
gps_stream(&_gpsdata, WATCH_DISABLE, NULL);
gps_close(&_gpsdata);
return dummy;
}
