As far as I know, RTLinux does not support recursive mutexes;
I also tried to use that once and it never worked; so I had to
develop a routine to implement the recursivity.
Mota.
On Fri, 20 Sep 2002, linus gasser wrote:
> Hi,
> I just tried a very simple program:
>
> pthread_mutex_t mutex_here;
>
> void *start_it( void *arg ){
> pthread_mutexattr_t attr;
>
> pthread_mutexattr_init( &attr );
> pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
> pthread_mutex_init( &mutex_here, &attr );
>
> rtl_printf( "Locking 1st\n" );
> pthread_mutex_lock( &mutex_here );
> rtl_printf( "Locking 2nd\n" );
> pthread_mutex_lock( &mutex_here );
> rtl_printf( "UnLocking 2nd\n" );
> pthread_mutex_unlock( &mutex_here );
> rtl_printf( "UnLocking 1st\n" );
> pthread_mutex_unlock( &mutex_here );
> }
>
> pthread_t start;
>
> int um_module_init(void){
> if ( pthread_create( &start, NULL, start_it, NULL ) ){
> rtl_printf( "Couldn't create thread!\n" );
> return -1;
> }
> return 0;
> }
>
> void um_module_exit( void ){
> }
>
>
> module_init( um_module_init );
> module_exit( um_module_exit );
>
> -------------------------------------------------------------------
>
> According to what I read about the mutexes and especially about
> PTHREAD_MUTEX_RECURSIVE, this should give
>
> Locking 1st
> Locking 2nd
> UnLocking 2nd
> UnLocking 1st
>
> But the thread hangs after printing the second line, like I would expect to do
> it if the attribute was PTHREAD_MUTEX_NORMAL. What am I doing wrong?
>
> Thanks for any help,
>
> Linus
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