Hi,
I was going through the deterministic scheduler for uniprocessor and
noticed in the code:
------------------------------------------------------------------------------------------------
"cpukit/include/rtems/score/schedulerpriority.h" :
typedef struct {
/**
* @brief Basic scheduler context.
*/
Scheduler_Context Base;
/**
* @brief Bit map to indicate non-empty ready queues.
*/
Priority_bit_map_Control Bit_map;
/**
* @brief One ready queue per priority level.
*/
Chain_Control Ready[ 0 ];
} Scheduler_priority_Context;
-----------------------------------------------------------------------------------
Where Scheduler_Context is defined as:
-----------------------------------------------------------------------------
>From "cpukit/include/rtems/score/scheduler.h":
typedef struct Scheduler_Context {
/**
* @brief Lock to protect this scheduler instance.
*/
ISR_LOCK_MEMBER( Lock )
#if defined(RTEMS_SMP)
/**
* @brief The set of processors owned by this scheduler instance.
*/
Processor_mask Processors;
#endif
} Scheduler_Context;
-------------------------------------------------------------------------------------------------
and ISR_LOCK is defined as:
------------------------------------------------------------------------------------------------------
"cpukit/include/rtems/score/isrlock.h"
/**
* @brief Defines an ISR lock member.
*
* Do not add a ';' after this macro.
*
* @param _designator The designator for the interrupt lock.
*/
#if defined( RTEMS_SMP )
#define ISR_LOCK_MEMBER( _designator ) ISR_lock_Control _designator;
#else
#define ISR_LOCK_MEMBER( _designator )
#endif
"cpukit/include/rtems/score/isrlock.h"
--------------------------------------------------------------------------------------------
Since we left the preprocessor directive as empty for the else case, it
means that for a non smp system, we don't use the ISR_LOCK as well as the
processor mask.
Then could someone please help me understand why we would include
Scheduler_Context Base in the Scheduler_priority_Context since this
scheduler is for a uniprocessor system and Scheduler_Context has nothing?
Thanks,
Richi.
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