B4J Question CallSubPlus: OutOfMemoryError

HARRY · Dec 31, 2018

In a For/Next loop I have to set an IO-Port High and after a while (say 5 msec) to set it Low again. I tried it as follows:

B4X:

Sub DoStep
    CSU.CallSubPlus(Me,"StepUp",5)
    CSU.CallSubPlus(Me,"StepDown",5)
End Sub
Sub StepUp
    PStep.State=True   
End Sub

Sub StepDown
    PStep.State=False
End Sub

After a while I get the following error info:

B4X:

java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:714)
    at anywheresoftware.b4a.objects.Timer.startTicking(Timer.java:68)
    at anywheresoftware.b4a.objects.Timer.setEnabled(Timer.java:77)
    at b4j.example.callsubutils._plusimpl(callsubutils.java:153)
    at b4j.example.callsubutils._callsubplus2(callsubutils.java:167)
    at b4j.example.callsubutils._callsubplus(callsubutils.java:81)
    at b4j.example.main._dostep(main.java:124)
    at b4j.example.main._scan(main.java:290)
    at b4j.example.main._stream2_newtext(main.java:426)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.j
ava:237)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:487)
    at anywheresoftware.b4a.keywords.Common.access$0(Common.java:467)
    at anywheresoftware.b4a.keywords.Common$CallSubDelayedHelper.run(Common.java:541)
    at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
    at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
    at anywheresoftware.b4a.ShellBA.startMessageLoop(ShellBA.java:115)
    at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:153)
    at anywheresoftware.
b4a.shell.Shell.raiseEventImpl(Shell.java:308)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
    at b4j.example.main.main(main.java:29)
Fout op regel: 47 (CallSubUtils)
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.OutOfMemoryError: unable to create new native thread
    at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:496)
    at anywheresoftware.b4a.keywords.Common.access$0(Common.java:467)
    at anywheresoftware.b4a.keywords.Common$CallSubDelayedHelper.run(Common.java:541)
    at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
    at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
    at anywheresoftware.b4a.ShellBA.startMessageLoop(ShellBA.java:115)
    at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:153)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:308)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.l
ang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
    at b4j.example.main.main(main.java:29)
Caused by: java.lang.RuntimeException: java.lang.OutOfMemoryError: unable to create new native thread
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:119)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:487)
    ... 16 more
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:714)
    at anywheresoftware.b4a.objects.Timer.startTicking(Timer.java:68)
    at anywheresoftware.b4a.objects.Timer.setEnabled(Timer.java:77)
    at b4j.example.callsubutils._plusimpl(callsubutils.java:153)
    at b4j.example.callsubutils._callsubplus2(callsubutils.java:167)
    at b4j.example.callsubutils._callsubplus(callsubutils.jav
a:81)
    at b4j.example.main._dostep(main.java:124)
    at b4j.example.main._scan(main.java:290)
    at b4j.example.main._stream2_newtext(main.java:426)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    ... 18 more
java.lang.RuntimeException: java.util.NoSuchElementException
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:119)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
    at b4j.example.main.main(main.java:29)
Caused by: java.util.NoSuchElementException
    at java.util.LinkedList.removeFirst(LinkedList.java:270)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:327)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    ... 3 more
Program terminated (StartMessageLoop was not called).

I also tried to use Sleep, but then, as far as I understand, the For/Next loop is continued while Sleeping. Of course I could use a time consuming loop, but the cpu has to run also another program, so that is not really an option.

Any suggestion?

Harry

Erel · Dec 31, 2018

There is no reason to use CallSubPlus.

Change your code to:

B4X:

Sub DoStep
    Sleep(5)
     StepUp
     Sleep(5)
     StepDown
End Sub

HARRY · Dec 31, 2018

Sorry Erel,

That doesn't work. The For Next is:

B4X:

For stepsdone = 0 To stepstodo -1 Step 1
        DoStep
    Next

.

B4X:

Sub DoStep
    Sleep(5)
     StepUp
     Sleep(5)
     StepDown
End Sub

When running the first Sleep(5) is executed and then the next DoStep is activated. StepUp is never called. In fact I need an 'old' Sleep, not resumable.

Harry

XbNnX_507 · Dec 31, 2018

I think this should help

B4X:

For stepsdone = 0 To stepstodo -1 Step 1
       wait for (   DoStep ) Complete
Next
Sub DoStep as resumablesub
    Sleep(5)
     StepUp
     Sleep(5)
     StepDown
     return 
End Sub

Erel · Jan 1, 2019

Almost. You must have a return value.

B4X:

For stepsdone = 0 To stepstodo -1 Step 1
       wait for ( DoStep) Complete (Unused As Boolean)
Next
Sub DoStep as resumablesub
    Sleep(5)
     StepUp
     Sleep(5)
     StepDown
     return True
End Sub

More info: [B4X] Resumable subs that return values (ResumableSub)

B4J Question CallSubPlus: OutOfMemoryError

HARRY

Active Member

Erel

B4X founder

HARRY

Active Member

XbNnX_507

Active Member

Erel

B4X founder

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