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/* inline/coremutex.inl
*
* This include file contains all of the inlined routines associated
* with the CORE mutexes.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#ifndef __INLINE_CORE_MUTEX_inl
#define __INLINE_CORE_MUTEX_inl
/*PAGE
*
* _CORE_mutex_Is_locked
*
* DESCRIPTION:
*
* This routine returns TRUE if the mutex specified is locked and FALSE
* otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_locked(
CORE_mutex_Control *the_mutex
)
{
return the_mutex->lock == CORE_MUTEX_LOCKED;
}
/*PAGE
*
* _CORE_mutex_Is_fifo
*
* DESCRIPTION:
*
* This routine returns TRUE if the mutex's wait discipline is FIFO and FALSE
* otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_fifo(
CORE_mutex_Attributes *the_attribute
)
{
return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_FIFO;
}
/*PAGE
*
* _CORE_mutex_Is_priority
*
* DESCRIPTION:
*
* This routine returns TRUE if the mutex's wait discipline is PRIORITY and
* FALSE otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_priority(
CORE_mutex_Attributes *the_attribute
)
{
return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY;
}
/*PAGE
*
* _CORE_mutex_Is_inherit_priority
*
* DESCRIPTION:
*
* This routine returns TRUE if the mutex's wait discipline is
* INHERIT_PRIORITY and FALSE otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_inherit_priority(
CORE_mutex_Attributes *the_attribute
)
{
return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT;
}
/*PAGE
*
* _CORE_mutex_Is_priority_ceiling
*
* DESCRIPTION:
*
* This routine returns TRUE if the mutex's wait discipline is
* PRIORITY_CEILING and FALSE otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_priority_ceiling(
CORE_mutex_Attributes *the_attribute
)
{
return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING;
}
/*PAGE
*
* _CORE_mutex_Seize_interrupt_trylock
*
* DESCRIPTION:
*
* This routine returns 0 if "trylock" can resolve whether or not the
* mutex is immediately obtained or there was an error attempting to
* get it. It returns 1 to indicate that the caller cannot obtain
* the mutex and will have to block to do so.
*
* NOTE: There is no MACRO version of this routine.
* A body is in coremutexseize.c that is duplicated
* from the .inl by hand.
*/
RTEMS_INLINE_ROUTINE int _CORE_mutex_Seize_interrupt_trylock(
CORE_mutex_Control *the_mutex,
ISR_Level *level_p
)
{
Thread_Control *executing;
ISR_Level level = *level_p;
/* disabled when you get here */
executing = _Thread_Executing;
executing->Wait.return_code = CORE_MUTEX_STATUS_SUCCESSFUL;
if ( !_CORE_mutex_Is_locked( the_mutex ) ) {
the_mutex->lock = CORE_MUTEX_LOCKED;
the_mutex->holder = executing;
the_mutex->holder_id = executing->Object.id;
the_mutex->nest_count = 1;
executing->resource_count++;
if ( the_mutex->Attributes.discipline !=
CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING ) {
_ISR_Enable( level );
return 0;
}
/* else must be CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING */
{
Priority_Control ceiling;
Priority_Control current;
ceiling = the_mutex->Attributes.priority_ceiling;
current = executing->current_priority;
if ( current == ceiling ) {
_ISR_Enable( level );
return 0;
}
if ( current > ceiling ) {
_Thread_Disable_dispatch();
_ISR_Enable( level );
_Thread_Change_priority(
the_mutex->holder,
the_mutex->Attributes.priority_ceiling,
FALSE
);
_Thread_Enable_dispatch();
return 0;
}
/* if ( current < ceiling ) */ {
executing->Wait.return_code = CORE_MUTEX_STATUS_CEILING_VIOLATED;
the_mutex->nest_count = 0; /* undo locking above */
executing->resource_count--; /* undo locking above */
_ISR_Enable( level );
return 0;
}
}
return 0;
}
if ( _Thread_Is_executing( the_mutex->holder ) ) {
switch ( the_mutex->Attributes.lock_nesting_behavior ) {
case CORE_MUTEX_NESTING_ACQUIRES:
the_mutex->nest_count++;
_ISR_Enable( level );
return 0;
case CORE_MUTEX_NESTING_IS_ERROR:
executing->Wait.return_code = CORE_MUTEX_STATUS_NESTING_NOT_ALLOWED;
_ISR_Enable( level );
return 0;
case CORE_MUTEX_NESTING_BLOCKS:
break;
}
}
return 1;
}
#endif
/* end of include file */
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