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Wait for at most 100ms for more data from the rx thread, so that we do not starve background tasks if the rx thread blocks (e.g on USB disconnect).

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Fixes #20.
This commit is contained in:
Oliver Jowett 2015-02-17 21:07:36 +00:00
parent aee837c903
commit 03e096475c
1 changed files with 14 additions and 3 deletions
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17
dump1090.c
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@ -988,16 +988,27 @@ int main(int argc, char **argv) {
struct timespec start_time;
if (Modes.iDataReady == 0) {
pthread_cond_wait(&Modes.data_cond,&Modes.data_mutex); // This unlocks Modes.data_mutex, and waits for Modes.data_cond
continue; // Once (Modes.data_cond) occurs, it locks Modes.data_mutex
/* wait for more data.
* we should be getting data every 50-60ms. wait for max 100ms before we give up and do some background work.
* this is fairly aggressive as all our network I/O runs out of the background work!
*/
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += 100000000;
normalize_timespec(&ts);
pthread_cond_timedwait(&Modes.data_cond, &Modes.data_mutex, &ts); // This unlocks Modes.data_mutex, and waits for Modes.data_cond
// Once (Modes.data_cond) occurs, it locks Modes.data_mutex
}
// Modes.data_mutex is Locked, and possibly (Modes.iDataReady != 0)
// copy out reader CPU time and reset it
add_timespecs(&Modes.reader_cpu_accumulator, &Modes.stats_current.reader_cpu, &Modes.stats_current.reader_cpu);
Modes.reader_cpu_accumulator.tv_sec = 0;
Modes.reader_cpu_accumulator.tv_nsec = 0;
// Modes.data_mutex is Locked, and (Modes.iDataReady != 0)
if (Modes.iDataReady) { // Check we have new data, just in case!!
start_cpu_timing(&start_time);