#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()

{

}