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/*
* Thread Handler
*
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/score/apiext.h>
#include <rtems/score/context.h>
#include <rtems/score/interr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/priority.h>
#include <rtems/score/states.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
/*PAGE
*
* _Thread_Initialize
*
* This routine initializes the specified the thread. It allocates
* all memory associated with this thread. It completes by adding
* the thread to the local object table so operations on this
* thread id are allowed.
*/
boolean _Thread_Initialize(
Objects_Information *information,
Thread_Control *the_thread,
void *stack_area,
unsigned32 stack_size,
boolean is_fp,
Priority_Control priority,
boolean is_preemptible,
Thread_CPU_budget_algorithms budget_algorithm,
Thread_CPU_budget_algorithm_callout budget_callout,
unsigned32 isr_level,
Objects_Name name
)
{
unsigned32 actual_stack_size = 0;
void *stack = NULL;
void *fp_area;
void *extensions_area;
/*
* Initialize the Ada self pointer
*/
the_thread->rtems_ada_self = NULL;
/*
* Allocate and Initialize the stack for this thread.
*/
if ( !stack_area ) {
if ( !_Stack_Is_enough( stack_size ) )
actual_stack_size = STACK_MINIMUM_SIZE;
else
actual_stack_size = stack_size;
actual_stack_size = _Thread_Stack_Allocate( the_thread, actual_stack_size );
if ( !actual_stack_size )
return FALSE; /* stack allocation failed */
stack = the_thread->Start.stack;
the_thread->Start.core_allocated_stack = TRUE;
} else {
stack = stack_area;
actual_stack_size = stack_size;
the_thread->Start.core_allocated_stack = FALSE;
}
_Stack_Initialize(
&the_thread->Start.Initial_stack,
stack,
actual_stack_size
);
/*
* Allocate the floating point area for this thread
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
if ( is_fp ) {
fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE );
if ( !fp_area ) {
_Thread_Stack_Free( the_thread );
return FALSE;
}
fp_area = _Context_Fp_start( fp_area, 0 );
} else
fp_area = NULL;
the_thread->fp_context = fp_area;
the_thread->Start.fp_context = fp_area;
#endif
/*
* Allocate the extensions area for this thread
*/
if ( _Thread_Maximum_extensions ) {
extensions_area = _Workspace_Allocate(
(_Thread_Maximum_extensions + 1) * sizeof( void * )
);
if ( !extensions_area ) {
if ( fp_area )
(void) _Workspace_Free( fp_area );
_Thread_Stack_Free( the_thread );
return FALSE;
}
} else
extensions_area = NULL;
the_thread->extensions = (void **) extensions_area;
/*
* General initialization
*/
the_thread->Start.is_preemptible = is_preemptible;
the_thread->Start.budget_algorithm = budget_algorithm;
the_thread->Start.budget_callout = budget_callout;
switch ( budget_algorithm ) {
case THREAD_CPU_BUDGET_ALGORITHM_NONE:
case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE:
break;
case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;
break;
case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
break;
}
the_thread->Start.isr_level = isr_level;
the_thread->current_state = STATES_DORMANT;
the_thread->resource_count = 0;
the_thread->suspend_count = 0;
the_thread->real_priority = priority;
the_thread->Start.initial_priority = priority;
the_thread->ticks_executed = 0;
_Thread_Set_priority( the_thread, priority );
/*
* Open the object
*/
_Objects_Open( information, &the_thread->Object, name );
/*
* Invoke create extensions
*/
if ( !_User_extensions_Thread_create( the_thread ) ) {
if ( extensions_area )
(void) _Workspace_Free( extensions_area );
if ( fp_area )
(void) _Workspace_Free( fp_area );
_Thread_Stack_Free( the_thread );
return FALSE;
}
return TRUE;
}
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