1 #include "iec_types_all.h"

     2 

     3 #define FREE 0

     4 #define ACQUIRED 1

     5 #define ANSWERED 2

     6 

     7 long SDOLock = FREE;

     8 extern long AtomicCompareExchange(long* atomicvar,long compared, long exchange);

     9 

    10 int AcquireSDOLock() {

    11 	return AtomicCompareExchange(&SDOLock, FREE, ACQUIRED) == FREE;

    12 }

    13 

    14 void SDOAnswered() {

    15 	AtomicCompareExchange(&SDOLock, ACQUIRED, ANSWERED);

    16 }

    17 

    18 int HasAnswer() {

    19 	return SDOLock == ANSWERED;

    20 }

    21 

    22 void ReleaseSDOLock() {

    23 	AtomicCompareExchange(&SDOLock, ANSWERED, FREE);

    24 }

    25 

    26 int __init_etherlab_ext()

    27 {

    28     SDOLock = FREE;

    29     return 0;

    30 }

    31 

    32 void __cleanup_etherlab_ext()

    33 {

    34 }

    35 

    36 void __retrieve_etherlab_ext()

    37 {

    38 }

    39 

    40 void __publish_etherlab_ext()

    41 {

    42 }