_Internal_error_Occurred from rtems_semaphore_obtain in rtems_termios_write

[Kenneth J. Peters]

I'm getting _Internal_error_Occurred called from 
rtems_semaphore_obtain in rtems_termios_write.

Sparc erc32-based BSP on custom hardware.

Two issues:

1. The _Internal_error_Occurred call is actually in 
cpukit/score/include/rtems/score/coremutex.h
and is just called with a hardcoded number, not an 
Internal_errors_Core_list enum item from 
cpukit/score/include/rtems/score/interr.h

>#define _CORE_mutex_Seize( \
>   _the_mutex, _id, _wait, _timeout, _level ) \
>   do { \
>     if ( _Thread_Dispatch_disable_level \
>         && (_wait) \
>         && (_System_state_Get() >= SYSTEM_STATE_BEGIN_MULTITASKING ) \
>        ) { \
>         _Internal_error_Occurred( \
>                             INTERNAL_ERROR_CORE, \
>                             FALSE, \
>                             18 /* called from wrong environment */); \
>     } \

Seems like this error code should be in the Internal_errors_Core_list 
enum . I don't know if there are any other hardcoded error values 
elsewhere.

2. I have not traced all through my code yet, or created a simple 
example. It could be that I am just doing something stupid like 
accidentally trying to print in a trap handler. However, if some 
kernel expert can explain a little about 
_Thread_Dispatch_disable_level, that might help me figure out what's 
going on. I am in multitasking when the error occurs, and the obtain 
call is with RTEMS_WAIT, so those make general sense to me.

Ken Peters
Ken.Peters at jpl.nasa.gov