From 37aa30ddc374b0078860c7f67b3a309aff3bb435 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 17 Feb 2006 20:51:12 +0000 Subject: [PATCH] Add description about non-blocking behavior Add description about the default non-blocking behavior. --- NOTES | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/NOTES b/NOTES index 5c0e0103..eb745c6b 100644 --- a/NOTES +++ b/NOTES @@ -32,3 +32,22 @@ assert() to catch with a debugger, in addition to parameter debugging. This feature is disabled when --with-debug=no is passed to configure, i.e. no strict checking is done in alsa-lib. + + +Blocking Open Mode +================== + +The default behavior of blocking at snd_pcm_open is changed to +non-blocking since version 1.0.11. That is, snd_pcm_open() returns +-EAGAIN immediately when the device is in use and cannot be opened, +while the function was blocked in the former version. This influences +only on the opening behavior. The behavior of the further access, +read/write, poll or commit, are not changed. They follow the extra +flag argument of snd_pcm_open() as well as the former version. + +For taking back the compatible behavior of open blocking mode, set + + defaults.pcm.nonblock 0 + +in /etc/asound.conf or ~/.asoundrc file. + -- 2.47.1