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Add PA ALSA extension to allow setting number of retries when busy

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This commit is contained in:
aknudsen 2009-05-24 17:02:10 +00:00
commit 822c292009
2 changed files with 13 additions and 1 deletions
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5
include/pa_linux_alsa.h
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@ -87,6 +87,11 @@ PaError PaAlsa_GetStreamOutputCard( PaStream *s, int *card );
*/
PaError PaAlsa_SetNumPeriods( int numPeriods );
/** Set the maximum number of times to retry opening busy device (sleeping for a
* short interval inbetween).
*/
PaError PaAlsa_SetRetriesBusy( int retries );
#ifdef __cplusplus
}
#endif

9
src/hostapi/alsa/pa_linux_alsa.c
View file

@ -100,6 +100,7 @@
static int aErr_; /* Used with ENSURE_ */
static int numPeriods_ = 4;
static int busyRetries_ = 100;
int PaAlsa_SetNumPeriods( int numPeriods )
{
@ -539,7 +540,7 @@ static int IgnorePlugin( const char *pluginId )
**/
static int OpenPcm( snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode, int waitOnBusy )
{
int tries = 0, maxTries = waitOnBusy ? 100 : 0;
int tries = 0, maxTries = waitOnBusy ? busyRetries_ : 0;
int ret = snd_pcm_open( pcmp, name, stream, mode );
for( tries = 0; tries < maxTries && -EBUSY == ret; ++tries )
{
@ -3670,3 +3671,9 @@ PaError PaAlsa_GetStreamOutputCard(PaStream* s, int* card) {
error:
return result;
}
PaError PaAlsa_SetRetriesBusy( int retries )
{
busyRetries_ = retries;
return paNoError;
}