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/*
* Multiprocessing Support for the Thread Handler
*
*
* 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/priority.h>
#include <rtems/score/thread.h>
#include <rtems/score/mpci.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/isr.h>
/*PAGE
*
* _Thread_MP_Handler_initialization
*
*/
void _Thread_MP_Handler_initialization (
uint32_t maximum_proxies
)
{
_Chain_Initialize_empty( &_Thread_MP_Active_proxies );
if ( maximum_proxies == 0 ) {
_Chain_Initialize_empty( &_Thread_MP_Inactive_proxies );
return;
}
_Chain_Initialize(
&_Thread_MP_Inactive_proxies,
_Workspace_Allocate_or_fatal_error(
maximum_proxies * sizeof( Thread_Proxy_control )
),
maximum_proxies,
sizeof( Thread_Proxy_control )
);
}
/*PAGE
*
* _Thread_MP_Allocate_proxy
*
*/
Thread_Control *_Thread_MP_Allocate_proxy (
States_Control the_state
)
{
Thread_Control *the_thread;
Thread_Proxy_control *the_proxy;
the_thread = (Thread_Control *)_Chain_Get( &_Thread_MP_Inactive_proxies );
if ( !_Thread_Is_null( the_thread ) ) {
the_proxy = (Thread_Proxy_control *) the_thread;
_Thread_Executing->Wait.return_code = THREAD_STATUS_PROXY_BLOCKING;
the_proxy->receive_packet = _MPCI_Receive_server_tcb->receive_packet;
the_proxy->Object.id = _MPCI_Receive_server_tcb->receive_packet->source_tid;
the_proxy->current_priority =
_MPCI_Receive_server_tcb->receive_packet->source_priority;
the_proxy->current_state = _States_Set( STATES_DORMANT, the_state );
the_proxy->Wait = _Thread_Executing->Wait;
_Chain_Append( &_Thread_MP_Active_proxies, &the_proxy->Active );
return the_thread;
}
_Internal_error_Occurred(
INTERNAL_ERROR_CORE,
TRUE,
INTERNAL_ERROR_OUT_OF_PROXIES
);
/*
* NOTE: The following return ensures that the compiler will
* think that all paths return a value.
*/
return NULL;
}
/*PAGE
*
* _Thread_MP_Find_proxy
*
*/
/*
* The following macro provides the offset of the Active element
* in the Thread_Proxy_control structure. This is the logical
* equivalent of the POSITION attribute in Ada.
*/
#define _Thread_MP_Proxy_Active_offset \
((uint32_t )&(((Thread_Proxy_control *)0))->Active)
Thread_Control *_Thread_MP_Find_proxy (
Objects_Id the_id
)
{
Chain_Node *proxy_node;
Thread_Control *the_thread;
ISR_Level level;
restart:
_ISR_Disable( level );
for ( proxy_node = _Thread_MP_Active_proxies.first;
!_Chain_Is_tail( &_Thread_MP_Active_proxies, proxy_node ) ;
) {
the_thread = (Thread_Control *) _Addresses_Subtract_offset(
proxy_node,
_Thread_MP_Proxy_Active_offset
);
if ( _Objects_Are_ids_equal( the_thread->Object.id, the_id ) ) {
_ISR_Enable( level );
return the_thread;
}
_ISR_Flash( level );
proxy_node = proxy_node->next;
/*
* A proxy which is only dormant is not in a blocking state.
* Therefore, we are looking at proxy which has been moved from
* active to inactive chain (by an ISR) and need to restart
* the search.
*/
if ( _States_Is_only_dormant( the_thread->current_state ) ) {
_ISR_Enable( level );
goto restart;
}
}
_ISR_Enable( level );
return NULL;
}
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