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score: Thread dispatch dis/enable without Giant

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Update #2273.
This commit is contained in:
Sebastian Huber
2015-02-28 17:24:52 +01:00
parent 222dc77583
commit 1512761142
1 changed files with 84 additions and 24 deletions
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108
cpukit/score/include/rtems/score/threaddispatch.h
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@@ -190,6 +190,16 @@ RTEMS_INLINE_ROUTINE void _Thread_Dispatch_initialization( void )
return disable_level;
}
RTEMS_INLINE_ROUTINE void _Giant_Acquire( Per_CPU_Control *cpu_self )
{
(void) cpu_self;
}
RTEMS_INLINE_ROUTINE void _Giant_Release( Per_CPU_Control *cpu_self )
{
(void) cpu_self;
}
#endif /* RTEMS_SMP */
/**
@@ -227,31 +237,62 @@ void _Thread_Dispatch( void );
void _Thread_Do_dispatch( Per_CPU_Control *cpu_self, ISR_Level level );
/**
* This routine prevents dispatching.
* @brief Disables thread dispatching inside a critical section (interrupts
* disabled).
*
* This function does not acquire the Giant lock.
*
* @param[in] cpu_self The current processor.
*/
#if defined ( __THREAD_DO_NOT_INLINE_DISABLE_DISPATCH__ )
void _Thread_Disable_dispatch( void );
#else
RTEMS_INLINE_ROUTINE void _Thread_Disable_dispatch( void )
RTEMS_INLINE_ROUTINE void _Thread_Dispatch_disable_critical(
Per_CPU_Control *cpu_self
)
{
_Thread_Dispatch_increment_disable_level();
RTEMS_COMPILER_MEMORY_BARRIER();
}
#endif
uint32_t disable_level = cpu_self->thread_dispatch_disable_level;
RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch_body( void )
_Profiling_Thread_dispatch_disable( cpu_self, disable_level );
cpu_self->thread_dispatch_disable_level = disable_level + 1;
}
/**
* @brief Disables thread dispatching.
*
* This function does not acquire the Giant lock.
*
* @return The current processor.
*/
RTEMS_INLINE_ROUTINE Per_CPU_Control *_Thread_Dispatch_disable( void )
{
Per_CPU_Control *cpu_self;
uint32_t disable_level;
cpu_self = _Per_CPU_Get();
#if defined( RTEMS_SMP ) || defined( RTEMS_PROFILING )
ISR_Level level;
#if defined( RTEMS_SMP )
_Giant_Release( cpu_self );
_ISR_Disable_without_giant( level );
#endif
disable_level = cpu_self->thread_dispatch_disable_level;
cpu_self = _Per_CPU_Get();
_Thread_Dispatch_disable_critical( cpu_self );
#if defined( RTEMS_SMP ) || defined( RTEMS_PROFILING )
_ISR_Enable_without_giant( level );
#endif
return cpu_self;
}
/**
* @brief Enables thread dispatching.
*
* May perfrom a thread dispatch if necessary as a side-effect.
*
* This function does not release the Giant lock.
*
* @param[in] cpu_self The current processor.
*/
RTEMS_INLINE_ROUTINE void _Thread_Dispatch_enable( Per_CPU_Control *cpu_self )
{
uint32_t disable_level = cpu_self->thread_dispatch_disable_level;
if ( disable_level == 1 ) {
ISR_Level level;
@@ -272,12 +313,31 @@ RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch_body( void )
}
/**
* This routine allows dispatching to occur again. If this is
* the outer most dispatching critical section, then a dispatching
* operation will be performed and, if necessary, control of the
* processor will be transferred to the heir thread.
* @brief Disables thread dispatching and acquires the Giant lock.
*/
#if defined ( __THREAD_DO_NOT_INLINE_DISABLE_DISPATCH__ )
void _Thread_Disable_dispatch( void );
#else
RTEMS_INLINE_ROUTINE void _Thread_Disable_dispatch( void )
{
_Thread_Dispatch_increment_disable_level();
RTEMS_COMPILER_MEMORY_BARRIER();
}
#endif
RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch_body( void )
{
Per_CPU_Control *cpu_self = _Per_CPU_Get();
_Giant_Release( cpu_self );
_Thread_Dispatch_enable( cpu_self );
}
/**
* @brief Enables thread dispatching and releases the Giant lock.
*
* May perfrom a thread dispatch if necessary as a side-effect.
*/
#if defined ( __THREAD_DO_NOT_INLINE_ENABLE_DISPATCH__ )
void _Thread_Enable_dispatch( void );
#else
@@ -290,11 +350,11 @@ RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch_body( void )
#endif
/**
* This routine allows dispatching to occur again. However,
* no dispatching operation is performed even if this is the outer
* most dispatching critical section.
* @brief Enables thread dispatching and releases the Giant lock.
*
* @warning A thread dispatch is not performed as a side-effect. Use this
* function with
*/
RTEMS_INLINE_ROUTINE void _Thread_Unnest_dispatch( void )
{
RTEMS_COMPILER_MEMORY_BARRIER();