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/**
* @file rtems/score/thread.inl
*
* This file contains the macro implementation of the inlined
* routines from the Thread handler.
*/
/*
* COPYRIGHT (c) 1989-2008.
* 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.rtems.com/license/LICENSE.
*
* $Id$
*/
#ifndef _RTEMS_SCORE_THREAD_H
# error "Never use <rtems/score/thread.inl> directly; include <rtems/score/thread.h> instead."
#endif
#ifndef _RTEMS_SCORE_THREAD_INL
#define _RTEMS_SCORE_THREAD_INL
#include <rtems/score/sysstate.h>
#include <rtems/score/context.h>
/**
* @addtogroup ScoreThread
* @{
*/
/**
* This routine returns true if thread dispatch indicates
* that we are in a critical section.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Dispatch_in_critical_section(void)
{
if ( _Thread_Dispatch_disable_level == 0 )
return false;
return true;
}
/**
* This routine returns value of the the thread dispatch level.
*/
RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_get_disable_level(void)
{
return _Thread_Dispatch_disable_level;
}
/**
* This routine sets thread dispatch level to the
* value passed in.
*/
RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_set_disable_level(uint32_t value)
{
_Thread_Dispatch_disable_level = value;
return value;
}
/**
* This rountine increments the thread dispatch level
*/
RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_increment_disable_level(void)
{
_Thread_Dispatch_disable_level++;
return _Thread_Dispatch_disable_level;
}
/**
* This routine decrements the thread dispatch level.
*/
RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_decrement_disable_level(void)
{
_Thread_Dispatch_disable_level--;
return _Thread_Dispatch_disable_level;
}
/**
* This routine initializes the thread dispatching subsystem.
*/
RTEMS_INLINE_ROUTINE void _Thread_Dispatch_initialization( void )
{
_Thread_Dispatch_set_disable_level( 1 );
}
/**
* This routine halts multitasking and returns control to
* the "thread" (i.e. the BSP) which initially invoked the
* routine which initialized the system.
*/
RTEMS_INLINE_ROUTINE void _Thread_Stop_multitasking( void )
{
/*
* This may look a bit of an odd but _Context_Restart_self is just
* a very careful restore of a specific context which ensures that
* if we were running within the same context, it would work.
*
* And we will not return to this thread, so there is no point of
* saving the context.
*/
_Context_Restart_self( &_Thread_BSP_context );
/***************************************************************
***************************************************************
* SYSTEM SHUTS DOWN!!! WE DO NOT RETURN TO THIS POINT!!! *
***************************************************************
***************************************************************
*/
}
/**
* This function returns true if the_thread is the currently executing
* thread, and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_executing (
const Thread_Control *the_thread
)
{
return ( the_thread == _Thread_Executing );
}
/**
* This function returns true if the_thread is the heir
* thread, and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_heir (
const Thread_Control *the_thread
)
{
return ( the_thread == _Thread_Heir );
}
/**
* This function returns true if the currently executing thread
* is also the heir thread, and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_executing_also_the_heir( void )
{
return ( _Thread_Executing == _Thread_Heir );
}
/**
* This routine clears any blocking state for the_thread. It performs
* any necessary scheduling operations including the selection of
* a new heir thread.
*/
RTEMS_INLINE_ROUTINE void _Thread_Unblock (
Thread_Control *the_thread
)
{
_Thread_Clear_state( the_thread, STATES_BLOCKED );
}
/**
* This routine resets the current context of the calling thread
* to that of its initial state.
*/
RTEMS_INLINE_ROUTINE void _Thread_Restart_self( void )
{
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
if ( _Thread_Executing->fp_context != NULL )
_Context_Restore_fp( &_Thread_Executing->fp_context );
#endif
_CPU_Context_Restart_self( &_Thread_Executing->Registers );
}
/**
* This function returns true if the floating point context of
* the_thread is currently loaded in the floating point unit, and
* false otherwise.
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
RTEMS_INLINE_ROUTINE bool _Thread_Is_allocated_fp (
const Thread_Control *the_thread
)
{
return ( the_thread == _Thread_Allocated_fp );
}
#endif
/**
* This routine is invoked when the currently loaded floating
* point context is now longer associated with an active thread.
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
RTEMS_INLINE_ROUTINE void _Thread_Deallocate_fp( void )
{
_Thread_Allocated_fp = NULL;
}
#endif
/**
* This routine prevents dispatching.
*/
#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
/**
* 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.
*/
#if defined ( __THREAD_DO_NOT_INLINE_ENABLE_DISPATCH__ )
void _Thread_Enable_dispatch( void );
#else
/* inlining of enable dispatching must be true */
RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch( void )
{
RTEMS_COMPILER_MEMORY_BARRIER();
if ( _Thread_Dispatch_decrement_disable_level() == 0 )
_Thread_Dispatch();
}
#endif
/**
* This routine allows dispatching to occur again. However,
* no dispatching operation is performed even if this is the outer
* most dispatching critical section.
*/
RTEMS_INLINE_ROUTINE void _Thread_Unnest_dispatch( void )
{
RTEMS_COMPILER_MEMORY_BARRIER();
_Thread_Dispatch_decrement_disable_level();
}
/**
* This function returns true if dispatching is disabled, and false
* otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_dispatching_enabled( void )
{
return ( _Thread_Dispatch_in_critical_section() == false );
}
/**
* This function returns true if dispatching is disabled, and false
* otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_context_switch_necessary( void )
{
return ( _Thread_Dispatch_necessary );
}
/**
* This function returns true if the_thread is NULL and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_null (
const Thread_Control *the_thread
)
{
return ( the_thread == NULL );
}
/** @brief _Thread_Is_proxy_blocking
*
* status which indicates that a proxy is blocking, and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Is_proxy_blocking (
uint32_t code
)
{
return (code == THREAD_STATUS_PROXY_BLOCKING);
}
/**
* This routine allocates an internal thread.
*/
RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Internal_allocate( void )
{
return (Thread_Control *) _Objects_Allocate( &_Thread_Internal_information );
}
/**
* This routine frees an internal thread.
*/
RTEMS_INLINE_ROUTINE void _Thread_Internal_free (
Thread_Control *the_task
)
{
_Objects_Free( &_Thread_Internal_information, &the_task->Object );
}
/**
* This routine returns the C library re-enterant pointer.
*/
RTEMS_INLINE_ROUTINE struct _reent **_Thread_Get_libc_reent( void )
{
return _Thread_libc_reent;
}
/**
* This routine set the C library re-enterant pointer.
*/
RTEMS_INLINE_ROUTINE void _Thread_Set_libc_reent (
struct _reent **libc_reent
)
{
_Thread_libc_reent = libc_reent;
}
/**
* This routine evaluates the current scheduling information for the
* system and determines if a context switch is required. This
* is usually called after changing an execution mode such as preemptability
* for a thread.
*
* @param[in] are_signals_pending specifies whether or not the API
* level signals are pending and a dispatch is needed.
*/
RTEMS_INLINE_ROUTINE bool _Thread_Evaluate_is_dispatch_needed(
bool are_signals_pending
)
{
Thread_Control *executing;
executing = _Thread_Executing;
if ( are_signals_pending ||
(!_Thread_Is_heir( executing ) && executing->is_preemptible) ) {
_Thread_Dispatch_necessary = true;
return true;
}
return false;
}
/**@}*/
#endif
/* end of include file */
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