etherlab/etherlab_ext.c
author Edouard Tisserant
Tue, 26 Jan 2021 11:17:08 +0100
branchsvghmi
changeset 3119 17a9c7a334f7
parent 2165 02a2b5dee5e3
permissions -rw-r--r--
SVGHMI: Fix browser side exception when some widget are not used, and are then discarded and not present in final SVG. In that case JS code was still making reference to discarded widget elements and was raising exception at init.
/*

Template C code used to produce target Ethercat C code.

Copyright (C) 2011-2014: Laurent BESSARD, Edouard TISSERANT

Distributed under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

See COPYING file for copyrights details.

*/

#include "iec_types_all.h"

#define FREE 0
#define ACQUIRED 1
#define ANSWERED 2

long SDOLock = FREE;
extern long AtomicCompareExchange(long* atomicvar,long compared, long exchange);

int AcquireSDOLock() {
	return AtomicCompareExchange(&SDOLock, FREE, ACQUIRED) == FREE;
}

void SDOAnswered() {
	AtomicCompareExchange(&SDOLock, ACQUIRED, ANSWERED);
}

int HasAnswer() {
	return SDOLock == ANSWERED;
}

void ReleaseSDOLock() {
	AtomicCompareExchange(&SDOLock, ANSWERED, FREE);
}

int __init_etherlab_ext()
{
    SDOLock = FREE;
    return 0;
}

void __cleanup_etherlab_ext()
{
}

void __retrieve_etherlab_ext()
{
}

void __publish_etherlab_ext()
{
}