124 lines
3.3 KiB
C
124 lines
3.3 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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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "wintype.h"
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#include "time_func.h"
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#include "msg_queue.h"
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PMSG_QUEUE Mq_alloc(UINT32 nentries)
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{
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int sz = sizeof(MSG_QUEUE) + (nentries * sizeof(MSG));
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PMSG_QUEUE rc;
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rc = (PMSG_QUEUE)malloc(sz);
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if (!rc)
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return NULL;
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memset(rc, 0, sz);
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rc->startbound = &(rc->messagestore[0]);
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rc->endbound = rc->startbound + nentries;
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rc->head = rc->tail = rc->startbound;
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rc->nentries = nentries;
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pthread_mutex_init(&(rc->mutex), NULL);
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return rc;
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}
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void Mq_destroy(PMSG_QUEUE queue)
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{
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pthread_mutex_destroy(&(queue->mutex));
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free(queue);
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}
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static void post_internal(PMSG_QUEUE queue, PMSG msg)
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{
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PMSG nexttail;
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pthread_mutex_lock(&(queue->mutex));
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nexttail = queue->tail + 1;
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if (nexttail == queue->endbound)
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nexttail = queue->startbound;
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if (nexttail != queue->head)
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{
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memcpy(queue->tail, msg, sizeof(MSG));
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queue->tail = nexttail;
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}
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/* else drop the message silently */
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pthread_mutex_unlock(&(queue->mutex));
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}
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void Mq_post(PMSG_QUEUE queue, HANDLE target, UINT32 message, const UINT_PTR *attrs, int nattrs)
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{
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MSG tmpmsg;
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memset(&tmpmsg, 0, sizeof(MSG));
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tmpmsg.target = target;
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tmpmsg.message = message;
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if (nattrs > MSG_ATTRCOUNT)
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nattrs = MSG_ATTRCOUNT;
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if (nattrs > 0)
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memcpy(&(tmpmsg.attrs), attrs, sizeof(UINT_PTR) * nattrs);
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tmpmsg.timestamp = Time_since_start();
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post_internal(queue, &tmpmsg);
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}
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void Mq_post2(PMSG_QUEUE queue, HANDLE target, UINT32 message, UINT_PTR attr1, UINT_PTR attr2)
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{
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MSG tmpmsg;
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memset(&tmpmsg, 0, sizeof(MSG));
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tmpmsg.target = target;
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tmpmsg.message = message;
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tmpmsg.attrs[0] = attr1;
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tmpmsg.attrs[1] = attr2;
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tmpmsg.timestamp = Time_since_start();
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post_internal(queue, &tmpmsg);
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}
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BOOL Mq_peek(PMSG_QUEUE queue, PMSG msg, UINT32 flags)
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{
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BOOL rc = FALSE;
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PMSG nexthead;
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pthread_mutex_lock(&(queue->mutex));
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if (queue->head != queue->tail)
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{
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nexthead = queue->head + 1;
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if (nexthead == queue->endbound)
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nexthead = queue->startbound;
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memcpy(msg, queue->head, sizeof(MSG));
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if (flags & PEEK_REMOVE)
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queue->head = nexthead;
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rc = TRUE;
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}
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pthread_mutex_unlock(&(queue->mutex));
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return rc;
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}
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BOOL Mq_is_empty(PMSG_QUEUE queue)
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{
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BOOL rc;
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pthread_mutex_lock(&(queue->mutex));
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rc = (queue->head == queue->tail);
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pthread_mutex_unlock(&(queue->mutex));
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return rc;
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}
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