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/**
* @file
*
* @brief Start Thread Multitasking
* @ingroup RTEMSScoreThread
*/
/*
* COPYRIGHT (c) 1989-2006.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadimpl.h>
#include <rtems/score/assert.h>
void _Thread_Start_multitasking( void )
{
Per_CPU_Control *cpu_self = _Per_CPU_Get();
Thread_Control *heir;
#if defined(RTEMS_SMP)
_Per_CPU_State_change( cpu_self, PER_CPU_STATE_UP );
/*
* Threads begin execution in the _Thread_Handler() function. This
* function will set the thread dispatch disable level to zero.
*/
cpu_self->thread_dispatch_disable_level = 1;
#endif
heir = _Thread_Get_heir_and_make_it_executing( cpu_self );
_Profiling_Thread_dispatch_disable( cpu_self, 0 );
#if defined(RTEMS_SMP)
_CPU_SMP_Prepare_start_multitasking();
#endif
#if defined(_CPU_Start_multitasking)
_CPU_Start_multitasking( &heir->Registers );
#elif defined(RTEMS_SMP)
{
Context_Control trash;
/*
* Mark the trash context as executing to not confuse the
* _CPU_Context_switch(). On SMP configurations the context switch
* contains a special hand over section to atomically switch from the
* executing to the currently selected heir thread.
*/
_CPU_Context_Set_is_executing( &trash, true );
_CPU_Context_switch( &trash, &heir->Registers );
RTEMS_UNREACHABLE();
}
#else
_CPU_Context_Restart_self( &heir->Registers );
#endif
}
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