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Added support for message priority as required by POSIX.

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This commit is contained in:
Joel Sherrill
1999-11-02 15:57:58 +00:00
parent af10d3ef5d
commit 9693fdac75
4 changed files with 86 additions and 10 deletions
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14
c/src/exec/score/include/rtems/score/coremsg.h
View File

@@ -56,6 +56,7 @@ typedef struct {
typedef struct {
Chain_Node Node;
int priority;
CORE_message_queue_Buffer Contents;
} CORE_message_queue_Buffer_control;
@@ -72,12 +73,17 @@ typedef enum {
* The following enumerated type details the modes in which a message
* may be submitted to a message queue. The message may be posted
* in a send or urgent fashion.
*
* NOTE: All other values are message priorities. Numerically smaller
* priorities indicate higher priority messages.
*
* XXX these constants should be changed to be compiler dependent.
*/
typedef enum {
CORE_MESSAGE_QUEUE_SEND_REQUEST = 0,
CORE_MESSAGE_QUEUE_URGENT_REQUEST = 1
} CORE_message_queue_Submit_types;
#define CORE_MESSAGE_QUEUE_SEND_REQUEST 0x7fffffff
#define CORE_MESSAGE_QUEUE_URGENT_REQUEST -(0x7fffffff)
typedef int CORE_message_queue_Submit_types;
/*
* Core Message queue handler return statuses.

34
c/src/exec/score/src/coremsg.c
View File

@@ -422,7 +422,8 @@ CORE_message_queue_Status _CORE_message_queue_Submit(
_CORE_message_queue_Copy_buffer( buffer, the_message->Contents.buffer, size );
the_message->Contents.size = size;
the_message->priority = submit_type;
the_message_queue->number_of_pending_messages += 1;
switch ( submit_type ) {
@@ -432,7 +433,38 @@ CORE_message_queue_Status _CORE_message_queue_Submit(
case CORE_MESSAGE_QUEUE_URGENT_REQUEST:
_CORE_message_queue_Prepend( the_message_queue, the_message );
break;
default:
/* XXX interrupt critical section needs to be addressed */
{
CORE_message_queue_Buffer_control *this_message;
Chain_Node *the_node;
the_message->priority = submit_type;
for ( the_node = the_message_queue->Pending_messages.first ;
!_Chain_Is_tail( &the_message_queue->Pending_messages, the_node ) ;
the_node = the_node->next ) {
this_message = (CORE_message_queue_Buffer_control *) the_node;
if ( this_message->priority >= the_message->priority )
continue;
_Chain_Insert( the_node, &the_message->Node );
break;
}
}
break;
}
/*
* According to POSIX, does this happen before or after the message
* is actually enqueued. It is logical to think afterwards, because
* the message is actually in the queue at this point.
*/
if ( the_message_queue->number_of_pending_messages == 1 &&
the_message_queue->notify_handler )
(*the_message_queue->notify_handler)( the_message_queue->notify_argument );
return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL;
}

14
cpukit/score/include/rtems/score/coremsg.h
View File

@@ -56,6 +56,7 @@ typedef struct {
typedef struct {
Chain_Node Node;
int priority;
CORE_message_queue_Buffer Contents;
} CORE_message_queue_Buffer_control;
@@ -72,12 +73,17 @@ typedef enum {
* The following enumerated type details the modes in which a message
* may be submitted to a message queue. The message may be posted
* in a send or urgent fashion.
*
* NOTE: All other values are message priorities. Numerically smaller
* priorities indicate higher priority messages.
*
* XXX these constants should be changed to be compiler dependent.
*/
typedef enum {
CORE_MESSAGE_QUEUE_SEND_REQUEST = 0,
CORE_MESSAGE_QUEUE_URGENT_REQUEST = 1
} CORE_message_queue_Submit_types;
#define CORE_MESSAGE_QUEUE_SEND_REQUEST 0x7fffffff
#define CORE_MESSAGE_QUEUE_URGENT_REQUEST -(0x7fffffff)
typedef int CORE_message_queue_Submit_types;
/*
* Core Message queue handler return statuses.

34
cpukit/score/src/coremsg.c
View File

@@ -422,7 +422,8 @@ CORE_message_queue_Status _CORE_message_queue_Submit(
_CORE_message_queue_Copy_buffer( buffer, the_message->Contents.buffer, size );
the_message->Contents.size = size;
the_message->priority = submit_type;
the_message_queue->number_of_pending_messages += 1;
switch ( submit_type ) {
@@ -432,7 +433,38 @@ CORE_message_queue_Status _CORE_message_queue_Submit(
case CORE_MESSAGE_QUEUE_URGENT_REQUEST:
_CORE_message_queue_Prepend( the_message_queue, the_message );
break;
default:
/* XXX interrupt critical section needs to be addressed */
{
CORE_message_queue_Buffer_control *this_message;
Chain_Node *the_node;
the_message->priority = submit_type;
for ( the_node = the_message_queue->Pending_messages.first ;
!_Chain_Is_tail( &the_message_queue->Pending_messages, the_node ) ;
the_node = the_node->next ) {
this_message = (CORE_message_queue_Buffer_control *) the_node;
if ( this_message->priority >= the_message->priority )
continue;
_Chain_Insert( the_node, &the_message->Node );
break;
}
}
break;
}
/*
* According to POSIX, does this happen before or after the message
* is actually enqueued. It is logical to think afterwards, because
* the message is actually in the queue at this point.
*/
if ( the_message_queue->number_of_pending_messages == 1 &&
the_message_queue->notify_handler )
(*the_message_queue->notify_handler)( the_message_queue->notify_argument );
return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL;
}