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Threads locking model fixed (reliable --ifile).

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antirez 2013-01-06 22:56:32 +01:00
parent c653e0e95d
commit 0a7c5c2e2e
1 changed files with 24 additions and 17 deletions
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41
dump1090.c
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@ -317,6 +317,7 @@ void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
if (len > Modes.data_len) len = Modes.data_len;
memcpy(Modes.data, buf, len);
Modes.data_ready = 1;
/* Signal to the other thread that new data is ready */
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
}
@ -324,11 +325,16 @@ void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
/* This is used when --ifile is specified in order to read data from file
* instead of using an RTLSDR device. */
void readDataFromFile(void) {
pthread_mutex_lock(&Modes.data_mutex);
while(1) {
ssize_t nread, toread;
unsigned char *p;
pthread_mutex_lock(&Modes.data_mutex);
if (Modes.data_ready) {
pthread_cond_wait(&Modes.data_cond,&Modes.data_mutex);
continue;
}
toread = Modes.data_len;
p = Modes.data;
while(toread) {
@ -340,9 +346,14 @@ void readDataFromFile(void) {
p += nread;
toread -= nread;
}
if (toread) {
/* Not enough data on file to fill the buffer? Pad with
* no signal. */
memset(p,127,toread);
}
Modes.data_ready = 1;
/* Signal to the other thread that new data is ready */
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
}
}
@ -1365,25 +1376,19 @@ int main(int argc, char **argv) {
pthread_cond_wait(&Modes.data_cond,&Modes.data_mutex);
continue;
}
if (Modes.exit) break;
computeMagnitudeVector();
/* If we are reading data from the RTLSDR device, process data
* after releasing the lock, so that the capturing thread can
* read data while we perform computationally expensive stuff
* at the same time. (This should only be useful with very
* slow processors).
*
* Instead if we are reading from file, process data before
* releasing the lock, in order to avoid missing parts of the file
* to process.
*/
if (Modes.filename) detectModeS(Modes.magnitude, Modes.data_len/2);
/* Signal to the other thread that we processed the available data
* and we want more (useful for --ifile). */
Modes.data_ready = 0;
pthread_mutex_unlock(&Modes.data_mutex);
if (!Modes.filename) detectModeS(Modes.magnitude, Modes.data_len/2);
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_lock(&Modes.data_mutex);
/* Process data after releasing the lock, so that the capturing
* thread can read data while we perform computationally expensive
* stuff * at the same time. (This should only be useful with very
* slow processors). */
pthread_mutex_unlock(&Modes.data_mutex);
detectModeS(Modes.magnitude, Modes.data_len/2);
/* Refresh screen when in interactive mode. */
if (Modes.interactive &&
@ -1393,6 +1398,8 @@ int main(int argc, char **argv) {
interactiveShowData();
Modes.interactive_last_update = mstime();
}
pthread_mutex_lock(&Modes.data_mutex);
if (Modes.exit) break;
}
/* If --ifile and --stats were given, print statistics. */