54 lines
2.4 KiB
C
54 lines
2.4 KiB
C
/*
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* UPIWIN - Micro Pi Windowing Framework Kernel
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* Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*-------------------------------------------------------------------------
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*/
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#ifndef __MSG_QUEUE_H_INCLUDED
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#define __MSG_QUEUE_H_INCLUDED
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#include <pthread.h>
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#include "wintype.h"
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#include "msg.h"
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/* internal structure of a message queue */
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typedef struct tagMSG_QUEUE {
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struct tagMSG_QUEUE *next; /* allow us to be in a singly-linked list */
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PMSG startbound; /* start boundary for message buffer */
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PMSG endbound; /* end boundary for message buffer */
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PMSG head; /* head pointer of message queue */
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PMSG tail; /* tail pointer of message queue */
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UINT32 nentries; /* number of entries possible in message buffer */
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pthread_mutex_t mutex; /* controls access to queue from multiple threads */
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MSG messagestore[0]; /* message buffer */
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} MSG_QUEUE, *PMSG_QUEUE;
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/* flags to Mq_peek */
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#define PEEK_REMOVE 0x0001 /* remove message if found */
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#define PEEK_NOREMOVE 0x0000 /* do not remove message if found */
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extern PMSG_QUEUE Mq_alloc(UINT32 nentries);
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extern void Mq_destroy(PMSG_QUEUE queue);
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extern void Mq_post(PMSG_QUEUE queue, HANDLE target, UINT32 message, const UINT_PTR *attrs, int nattrs);
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extern void Mq_post2(PMSG_QUEUE queue, HANDLE target, UINT32 message, UINT_PTR attr1, UINT_PTR attr2);
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extern BOOL Mq_peek(PMSG_QUEUE queue, PMSG msg, UINT32 flags);
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extern BOOL Mq_is_empty(PMSG_QUEUE queue);
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#define Mq_post0(q, tgt, msg) Mq_post2(q, tgt, msg, 0, 0)
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#define Mq_post1(q, tgt, msg, attr) Mq_post2(q, tgt, msg, attr, 0)
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#endif /* __MSG_QUEUE_H_INCLUDED */
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