1 <?xml version='1.0' encoding='utf-8'?> |
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2 <CFile xmlns:xhtml="http://www.w3.org/1999/xhtml"> |
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3 <includes> |
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4 <xhtml:p><![CDATA[ |
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5 ]]></xhtml:p> |
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6 </includes> |
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7 <variables> |
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8 <variable name="TestInput" type="SINT" initial="0"/> |
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9 <variable name="TestOutput" type="SINT"/> |
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10 </variables> |
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11 <globals> |
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12 <xhtml:p><![CDATA[ |
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13 volatile long Lock=0; |
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14 volatile char PtoC=1,CtoP=2; |
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15 |
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16 extern long AtomicCompareExchange(long*,long, long); |
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17 extern char *PLC_ID; |
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18 |
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19 int Simple_C_Call(int val){ |
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20 return val+1; |
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21 } |
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22 |
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23 int Python_to_C_Call(char toC, char *fromC){ |
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24 /* Code called by python should never touch to |
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25 variables modified by PLC thread directly |
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26 |
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27 AtomicCompareExchange comes from |
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28 beremiz' runtime implementation */ |
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29 |
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30 int res = 0; |
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31 if(!AtomicCompareExchange((long*)&Lock, 0, 1)){ |
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32 PtoC=toC; |
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33 *fromC=CtoP; |
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34 AtomicCompareExchange((long*)&Lock, 1, 0); |
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35 res=1; |
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36 } |
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37 printf("C code called by Python: toC %d fromC %d\n",toC,*fromC); |
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38 printf("PLC_ID id %s\n",PLC_ID); |
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39 return res; |
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40 } |
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41 |
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42 int PLC_C_Call(char fromPLC, char *toPLC){ |
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43 /* PLC also have to be realy carefull not to |
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44 conflict with asynchronous python access */ |
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45 if(!AtomicCompareExchange((long*)&Lock, 0, 1)){ |
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46 CtoP = fromPLC; |
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47 *toPLC = PtoC; |
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48 AtomicCompareExchange((long*)&Lock, 1, 0); |
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49 return 1; |
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50 } |
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51 return 0; |
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52 } |
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53 ]]></xhtml:p> |
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54 </globals> |
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55 <initFunction> |
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56 <xhtml:p><![CDATA[ |
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57 ]]></xhtml:p> |
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58 </initFunction> |
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59 <cleanUpFunction> |
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60 <xhtml:p><![CDATA[ |
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61 ]]></xhtml:p> |
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62 </cleanUpFunction> |
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63 <retrieveFunction> |
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64 <xhtml:p><![CDATA[ |
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65 ]]></xhtml:p> |
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66 </retrieveFunction> |
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67 <publishFunction> |
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68 <xhtml:p><![CDATA[ |
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69 if(!AtomicCompareExchange((long*)&Lock, 0, 1)){ |
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70 TestInput = CtoP + PtoC + TestOutput; |
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71 AtomicCompareExchange((long*)&Lock, 1, 0); |
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72 } |
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73 ]]></xhtml:p> |
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74 </publishFunction> |
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75 </CFile> |
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