void _Scheduler_Request_ask_for_help( Thread_Control *the_thread ) { ISR_lock_Context lock_context; _Thread_Scheduler_acquire_critical( the_thread, &lock_context ); if ( _Chain_Is_node_off_chain( &the_thread->Scheduler.Help_node ) ) { Per_CPU_Control *cpu; cpu = _Thread_Get_CPU( the_thread ); _Per_CPU_Acquire( cpu ); _Chain_Append_unprotected( &cpu->Threads_in_need_for_help, &the_thread->Scheduler.Help_node ); _Per_CPU_Release( cpu ); _Thread_Dispatch_request( _Per_CPU_Get(), cpu ); } _Thread_Scheduler_release_critical( the_thread, &lock_context ); }
void _Thread_Handler( void ) { ISR_Level level; Thread_Control *executing; #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) bool doCons; #endif executing = _Thread_Executing; /* * Some CPUs need to tinker with the call frame or registers when the * thread actually begins to execute for the first time. This is a * hook point where the port gets a shot at doing whatever it requires. */ _Context_Initialization_at_thread_begin(); #if !defined(RTEMS_SMP) /* * have to put level into a register for those cpu's that use * inline asm here */ level = executing->Start.isr_level; _ISR_Set_level( level ); #endif #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) doCons = _Thread_Handler_is_constructor_execution_required( executing ); #endif /* * Initialize the floating point context because we do not come * through _Thread_Dispatch on our first invocation. So the normal * code path for performing the FP context switch is not hit. */ #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) if ( (executing->fp_context != NULL) && !_Thread_Is_allocated_fp( executing ) ) { if ( _Thread_Allocated_fp != NULL ) _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); _Thread_Allocated_fp = executing; } #endif #endif /* * Take care that 'begin' extensions get to complete before * 'switch' extensions can run. This means must keep dispatch * disabled until all 'begin' extensions complete. */ _User_extensions_Thread_begin( executing ); /* * At this point, the dispatch disable level BETTER be 1. */ #if defined(RTEMS_SMP) { /* * On SMP we enter _Thread_Handler() with interrupts disabled and * _Thread_Dispatch() obtained the per-CPU lock for us. We have to * release it here and set the desired interrupt level of the thread. */ Per_CPU_Control *per_cpu = _Per_CPU_Get(); _Assert( per_cpu->thread_dispatch_disable_level == 1 ); _Assert( _ISR_Get_level() != 0 ); per_cpu->thread_dispatch_disable_level = 0; _Per_CPU_Release( per_cpu ); level = executing->Start.isr_level; _ISR_Set_level( level); /* * The thread dispatch level changed from one to zero. Make sure we lose * no thread dispatch necessary update. */ _Thread_Dispatch(); } #else _Thread_Enable_dispatch(); #endif #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) /* * _init could be a weak symbol and we SHOULD test it but it isn't * in any configuration I know of and it generates a warning on every * RTEMS target configuration. --joel (12 May 2007) */ if (doCons) /* && (volatile void *)_init) */ { INIT_NAME (); } #endif /* * RTEMS supports multiple APIs and each API can define a different * thread/task prototype. The following code supports invoking the * user thread entry point using the prototype expected. */ if ( executing->Start.prototype == THREAD_START_NUMERIC ) { executing->Wait.return_argument = (*(Thread_Entry_numeric) executing->Start.entry_point)( executing->Start.numeric_argument ); } #if defined(RTEMS_POSIX_API) else if ( executing->Start.prototype == THREAD_START_POINTER ) { executing->Wait.return_argument = (*(Thread_Entry_pointer) executing->Start.entry_point)( executing->Start.pointer_argument ); } #endif #if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API) else if ( executing->Start.prototype == THREAD_START_BOTH_POINTER_FIRST ) { executing->Wait.return_argument = (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( executing->Start.pointer_argument, executing->Start.numeric_argument ); } else if ( executing->Start.prototype == THREAD_START_BOTH_NUMERIC_FIRST ) { executing->Wait.return_argument = (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( executing->Start.numeric_argument, executing->Start.pointer_argument ); } #endif /* * In the switch above, the return code from the user thread body * was placed in return_argument. This assumed that if it returned * anything (which is not supporting in all APIs), then it would be * able to fit in a (void *). */ _User_extensions_Thread_exitted( executing ); _Internal_error_Occurred( INTERNAL_ERROR_CORE, true, INTERNAL_ERROR_THREAD_EXITTED ); }