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"Invalid Table Handle" in background Thread

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    #16
    Re: "Invalid Table Handle" in background Thread

    Graham,

    I unzipped it and looked at it. Can you provide me with the syntax and information you get from the Dim bs as p = sockets.open("127.0.0.1",30003,"C") device? I can make a file-clone to simulate it.

    However, it now 00:40 in the night and it will be this evening at about 19:00 when I start again.

    :)
    Marcel

    I hear and I forget. I see and I remember. I do and I understand.
    ---- Confusius ----

    Comment


      #17
      Re: "Invalid Table Handle" in background Thread

      Graham,
      There's no index named "mode_s" in the exampleLogFile table. I'll change the index name in the code to "modes" if that's the right index.

      Comment


        #18
        Re: "Invalid Table Handle" in background Thread

        Graham,
        The main problem appears to be that the thread doesn't keep the table pointer open. I inserted a tbl.persist() and then the script works (after fixing a few more small errors). Here's what I got:
        Code:
        thread_code=<<%code%
        xbasic_error_log("c:\threads\Thread_error_log.txt")
        'dim MonitorThreadRunFlag as l = .t.
        dim MonitorArray[2000] as c
        dim MonitorModeS[2000] as c
        dim VarArray[23] as c
        dim incr as n = 1
        dim k as n = 1
        dim rec as n
        dim CheckModeS as n
        dim bsOutput as c
        dim bsOutcrlf as c
        'dim MonitorVarArray[2000,23] as c
        if file.exists("c:\threads\Output.txt") then
        	file.remove("c:\threads\Output.txt")
        end if
        dim fp as p= file.create("c:\threads\Output.txt",FILE_RW_SHARED)
        tbl = table.open("c:\threads\examplelogfile",FILE_RW_SHARED)
        idx = tbl.index_primary_put("ModeS")
        'dim bs as p = sockets.open("127.0.0.1",30003,"C")
        tbl.persist()
        dim bs as p= file.open("c:\threads\Testdata.csv",FILE_RO_SHARED)
        
        'WHILE MonitorThreadRunFlag
        bsOutput=bs.read_line()
        WHILE bs.eof() = .f.
        	bsOutput = substr(bsOutput,at("MSG",bsOutput))
        	IF left(bsOutput,3) = "MSG" THEN
        		bsOutcrlf = comma_to_crlf(bsOutput)
        		VarArray.clear()
        '		dim j as n = 1
        '		FOR each VarRead in bsOutcrlf
        '			VarArray[j] = VarRead
        '			j = j + 1
        '		next
        		VarArray.initialize(bsOutcrlf)
        		IF inlist(VarArray[2],"3","4","8") THEN
        			simple_value = convert_type(VarArray[5],"C")
        			rec = tbl.fetch_find(simple_value)
        			CheckModeS = MonitorModeS.find(Simple_value)
        			IF rec > 0 .and. CheckModeS = 0 THEN
        				MonitorArray[incr] = padr(tbl.reg,9," ")+"["+padr(tbl.ICAOTypeCode,4," ")+"]"
        				MonitorModeS[incr] = VarArray[5]
        				incr = incr + 1
        			END IF
        			IF CheckModeS > 0 .and. VarArray[2] = "3" .and. val(VarArray[15]) <> 0 THEN
        				IF right(ut(MonitorArray[CheckModeS]),1) <> "+" THEN
        					MonitorArray[CheckModeS] = MonitorArray[CheckModeS]+"+"
        				END IF
        			END IF
        			IF rec < 0 .and. CheckModeS = 0 THEN
        				MonitorArray[incr] = padr(VarArray[5],8," ")+"[New]"
        				MonitorModeS[incr] = VarArray[5]
        				incr = incr + 1
        			END IF
        		END IF
        	END IF
        	fp.write_line("Processed line "+bsOutput)
        	bsOutput = bs.read_line()
        END WHILE
        bs.close()
        tbl.close()
        fp.write_line("Thread Test Ended at "+time("",now()))
        fp.flush()
        fp.close()
        %code%
        
        thread_create("TestMonitorArrayThread",thread_code)
        Using this code I was able to read and process the entire csv file in a background thread. I assume you can do the same with sockets.

        Comment


          #19
          Re: &quot;Invalid Table Handle&quot; in background Thread

          I had a re-think overnight and went back to my original script from about three weeks ago and got it to work.[this was before I read Peter's latest message].

          Code:
          dim MonitorThreadRunFlag as l = .t.
          dim global MonitorArray[2000] as c
          dim global MonitorModeS[2000] as c
          dim VarArray[23] as c
          dim incr as n = 1
          dim j as n = 1
          dim rec as n
          dim CheckModeS as n
          dim bsOutput as c
          dim bsOutcrlf as c
          dim global MonitorVarArray[2000,23] as c
          dim bs as p = sockets.open("127.0.0.1",30003,"C")
          ns  = local_variables()
          thread_create("TestMonitorArrayThread",<<%code%
          xbasic_error_log("d:\my databases\sbs\MsgLogs\Thread_error_log.txt")
          WHILE MonitorThreadRunFlag
          	bsOutput = bs.readline()
          	IF left(bsOutput,3) = "MSG" THEN
          		bsOutcrlf = comma_to_crlf(bsOutput)
          		VarArray.clear()
          		dim j as n = 1
          		FOR each VarRead in bsOutcrlf
          			VarArray[j] = VarRead
          			j = j + 1
          		next
          		IF inlist(VarArray[2],"3","4","8") THEN
          			CheckModeS = MonitorModeS.find(VarArray[5])
          			[COLOR="Red"]if CheckModeS = 0 then
          			    tbl = table.open("logging",FILE_RW_SHARED)
          				idx = tbl.index_primary_put("Mode_S")
          				rec = tbl.fetch_find(VarArray[5])[/COLOR]
          				IF rec > 0 .and. CheckModeS = 0 THEN
          					MonitorArray[incr] = padr(tbl.reg,9," ")+"["+padr(tbl.ICAOTypeCode,4," ")+"]"
          					MonitorModeS[incr] = VarArray[5]
          					incr = incr + 1
          				END IF
          				[COLOR="Red"]tbl.close()
          			end if[/COLOR]	
          			IF CheckModeS > 0 .and. VarArray[2] = "3" .and. val(VarArray[15]) <> 0 THEN
          				IF right(ut(MonitorArray[CheckModeS]),1) <> "+" THEN
          					MonitorArray[CheckModeS] = MonitorArray[CheckModeS]+"+"
          				END IF
          			END IF
          			IF rec < 0 .and. CheckModeS = 0 THEN
          				MonitorArray[incr] = padr(VarArray[5],8," ")+"[New]"
          				MonitorModeS[incr] = VarArray[5]
          				incr = incr + 1
          			END IF
          		END IF
          	END IF
          END WHILE
          bs.close()
          tbl.close()
          %code%,ns)
          ui_msg_box("Thread Test","Ended at "+time("",now()))
          I shall now go away and digest Peter's Suggestion.
          --
          Support your local Search and Rescue Unit, Get Lost!

          www.westrowops.co.uk

          Comment


            #20
            Re: &quot;Invalid Table Handle&quot; in background Thread

            Taking all that I have learnt on-board, I finally have a thread that runs ok.
            thanks to Marcel,Tim & Peter for your inputs.

            for anyone interested the final version is thus:

            Code:
            thread_code=<<%code%
            dim MonitorThreadRunFlag as l = .t.
            dim global MonitorArray[2000] as c
            dim global MonitorModeS[2000] as c
            dim VarArray[23] as c
            dim incr as n = 1
            dim rec as n
            dim CheckModeS as n
            dim bsOutput as c
            dim bsOutcrlf as c
            dim bs as p = sockets.open("127.0.0.1",30003,"C")
            dim path as c = "d:\my databases\sbs\MsgLogs\"
            IF file.exists(Path+"SBSMonitorErrorLog.txt")
            	file.remove(Path+"SBSMonitorErrorLog.txt")
            END IF
            xbasic_error_log(Path+"SBSMonitorErrorLog.txt")
            tbl = table.open("logging",FILE_RW_SHARED)
            idx = tbl.index_primary_put("Mode_S")
            WHILE MonitorThreadRunFlag
            	bsOutput = bs.readline()
            	IF left(bsOutput,3) = "MSG" THEN
            		bsOutcrlf = comma_to_crlf(bsOutput)
            		VarArray.clear()
            		VarArray.initialize(bsOutcrlf)
            		IF inlist(VarArray[2],"3","4","8") THEN
            			CheckModeS = MonitorModeS.find(VarArray[5])
            			IF CheckModeS = 0 THEN
            				rec = tbl.fetch_find(VarArray[5])
            				IF rec > 0 .and. CheckModeS = 0  THEN
            					IF isblank("tbl.as") THEN
            						MonitorArray[incr] = padr(tbl.reg,9," ")+"["+padr(tbl.ICAOTypeCode,4," ")+"]"
            						MonitorModeS[incr] = VarArray[5]
            						incr = incr + 1
            					END IF
            				END IF
            			END IF
            			IF CheckModeS > 0 .and. VarArray[2] = "3" .and. val(VarArray[15]) <> 0 THEN
            				IF right(ut(MonitorArray[CheckModeS]),1) <> "+" THEN
            					MonitorArray[CheckModeS] = MonitorArray[CheckModeS]+"+"
            				END IF
            			END IF
            			IF rec < 0 .and. CheckModeS = 0 THEN
            				MonitorArray[incr] = padr(VarArray[5],8," ")+"[New]"
            				MonitorModeS[incr] = VarArray[5]
            				incr = incr + 1
            			END IF
            		END IF
            	END IF
            END WHILE
            bs.close()
            tbl.close()
            %code%
            
            thread_create("TestMonitorArrayThread",Thread_code)
            --
            Support your local Search and Rescue Unit, Get Lost!

            www.westrowops.co.uk

            Comment


              #21
              Correction!

              Originally posted by Graham Wickens
              does that mean I refer to all variables with prefix NS?

              i.e. tbl = table.open("Logging",FILE_RW_SHARED)
              dim Incr as n = 1
              I would refer to them as
              ns.tbl.fetch_first()
              and
              ns.incr
              Originally posted by Marcel Kollenaar View Post
              Yes. <<<<wrong
              Now I'm busy again with my own threads and sockets and looking at Grahams code again I have to correct my answer here. It has to be 'No'. There is no need for prefix them, just passing the ns-pointer in thread_create("thread_name", thread_code, ns) is enough. All variables outside the thread can be used when you use dim ns as P = local_variables()
              Last edited by Marcel Kollenaar; 03-16-2007, 05:38 PM. Reason: Some grammar stuff
              Marcel

              I hear and I forget. I see and I remember. I do and I understand.
              ---- Confusius ----

              Comment

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