forked from Imagelibrary/rtems
cbb1103a3c
The per-CPU states which control the SMP system initialization were added quite early during the SMP support development. Replace this initial implementation with a simplified one. There is no longer a global SMP lock required which serialized the state changes of all processors. The new implementation better integrates with the per-CPU jobs.
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSScoreThread
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*
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* @brief This source file contains the implementation of
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* _Thread_Start_multitasking().
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*/
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/*
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* COPYRIGHT (c) 1989-2006.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/score/threadimpl.h>
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#include <rtems/score/assert.h>
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#include <rtems/score/smpimpl.h>
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void _Thread_Start_multitasking( void )
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{
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Per_CPU_Control *cpu_self = _Per_CPU_Get();
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Thread_Control *heir;
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#if defined(RTEMS_SMP)
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_Per_CPU_Set_state( cpu_self, PER_CPU_STATE_UP );
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_SMP_Try_to_process_message( cpu_self, SMP_MESSAGE_FORCE_PROCESSING );
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/*
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* Threads begin execution in the _Thread_Handler() function. This
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* function will set the thread dispatch disable level to zero.
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*/
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cpu_self->thread_dispatch_disable_level = 1;
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#endif
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heir = _Thread_Get_heir_and_make_it_executing( cpu_self );
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_Profiling_Thread_dispatch_disable( cpu_self, 0 );
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#if defined(RTEMS_SMP)
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_CPU_SMP_Prepare_start_multitasking();
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#endif
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#if defined(_CPU_Start_multitasking)
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_CPU_Start_multitasking( &heir->Registers );
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#elif defined(RTEMS_SMP)
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{
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Context_Control trash;
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/*
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* Mark the trash context as executing to not confuse the
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* _CPU_Context_switch(). On SMP configurations the context switch
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* contains a special hand over section to atomically switch from the
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* executing to the currently selected heir thread.
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*/
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_CPU_Context_Set_is_executing( &trash, true );
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_CPU_Context_switch_no_return( &trash, &heir->Registers );
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RTEMS_UNREACHABLE();
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}
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#else
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_CPU_Context_Restart_self( &heir->Registers );
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#endif
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}
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