From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konstantin Stepaniuk Subject: Re: exit() -> _exit() in pcm_direct.c Date: Wed, 30 Jul 2003 23:21:52 +0400 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3F281AD0.5090402@mail.ru> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Jaroslav Kysela Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Jaroslav Kysela wrote: >On Wed, 30 Jul 2003, Konstantin Stepaniuk wrote: > > > >>Hello. >> >>My program call snd_pcm_open() with "plug:dmix" in thread. >>Function snd_pcm_direct_server_create() hangs on waitpid() if exit() is used, >>and server_job process keeps alive after program exit. >>This trivial patch chages exit() to _exit() in file pcm_direct.c. In this case >>all works ok for me. >> >> > >I'm sorry, but I still don't see a reason (I'd like to know, why the >process hangs). Could you explain the behaviour or send me a simple test >code to debug this thing? > > Jaroslav > >----- >Jaroslav Kysela >Linux Kernel Sound Maintainer >ALSA Project, SuSE Labs > > Here's a test: /* dmix.c */ #define ALSA_PCM_NEW_HW_PARAMS_API #define ALSA_PCM_NEW_SW_PARAMS_API #include #include #include void *thread_routine( void *param ) { snd_pcm_t *pcm; int err; err = snd_pcm_open( &pcm, "plug:dmix", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ); if( err < 0 ) { fprintf( stderr, "%s\n", snd_strerror(err) ); return NULL; } printf( "alsa opened\n" ); snd_pcm_close( pcm ); return NULL; } int main( void ) { pthread_t thread; int i; if( pthread_create( &thread, 0, thread_routine, NULL ) ) { fprintf( stderr, "pthread_create failure\n" ); return -1; } pthread_join( thread, NULL ); return 0; } /*--------------------*/ This program crashes without any error message and doesn't print "alsa opened". sound card: intel8x0 alsa version: cvs snapshot 2003-07-30 kernel version: 2.4.21 (Debian) glibc: 2.3.1 This works ok with cmipci card. Maybe problem with intel8x0? P.S. Add please '\n' in aplay version string :) ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01