[Swift-user] Coordination between app calls in foreach loop

[Mihael Hategan]

I can confirm this bug. Apps don't properly wait for arrays.

Mihael

On Fri, 2013-09-20 at 14:08 -0500, Ketan Maheshwari wrote:
> Hi,
> 
> I am working with APS user Hemant Sharma (in CC) on one of his projects.
> Hemant wrote a Swift script which has about three foreach invocations which
> he wants to run one after other.
> 
> In order to achieve this coordination, Hemant is using an int[] in one loop
> which is passed as input to the app call of another loop. He observes that
> the coordination is not maintained and both app calls happen simultaneously
> resulting in application error.
> 
> Here is a quick reproduction I tried and I observe indeed that coordination
> is not happening:
> 
> $ cat dummy.swift
> type file;
> 
> app (file out) A (string in1){
>   dummyA in1 stdout=@out;
> }
> 
> app (file out) B (string in1, int[] _art){
>   dummyB in1 stdout=@out;
> }
> 
> file outfileA[]<simple_mapper; location="outdir",
> prefix="a.",suffix=".out">;
> file outfileB[]<simple_mapper; location="outdir",
> prefix="b.",suffix=".out">;
> 
> int art[];
> foreach i in [0:3]{
>  outfileA[i] = A ("astring");
>  art[i]=i;
>  }
> 
> foreach j in [0:3]{
>  outfileB[j] = B ("bstring", art);
>  }
> 
> Since the art array is wholly required in app B, one would expect the first
> foreach to finish befor the call to B gets invoked. This is not happening
> in my simple test where I ask the executable called by A to sleep for 5 sec
> and that called by B to print timestamp and quit.
> 
> I see in the resulting files that the timestamps in B precede those in A.
> 
> This looks like a bug to me. Swift is 0.94 swift-r7091 cog-r3789.
> 
> Thanks,
> Hi,
> 
> 
> I am working with APS user Hemant Sharma (in CC) on one of his
> projects. Hemant wrote a Swift script which has about three foreach
> invocations which he wants to run one after other.
> 
> 
> In order to achieve this coordination, Hemant is using an int[] in one
> loop which is passed as input to the app call of another loop. He
> observes that the coordination is not maintained and both app calls
> happen simultaneously resulting in application error. 
> 
> 
> Here is a quick reproduction I tried and I observe indeed that
> coordination is not happening:
> 
> $ cat dummy.swift
> type file;
> 
> app (file out) A (string in1){
>   dummyA in1 stdout=@out;
> }
> 
> app (file out) B (string in1, int[] _art){
>   dummyB in1 stdout=@out;
> }
> 
> file outfileA[]<simple_mapper; location="outdir",
> prefix="a.",suffix=".out">;
> file outfileB[]<simple_mapper; location="outdir",
> prefix="b.",suffix=".out">;
> 
> int art[];
> foreach i in [0:3]{
>  outfileA[i] = A ("astring");
>  art[i]=i;
>  }
> 
> foreach j in [0:3]{
>  outfileB[j] = B ("bstring", art);
>  }
> 
> 
> Since the art array is wholly required in app B, one would expect the
> first foreach to finish befor the call to B gets invoked. This is not
> happening in my simple test where I ask the executable called by A to
> sleep for 5 sec and that called by B to print timestamp and quit.
> 
> 
> I see in the resulting files that the timestamps in B precede those in
> A.
> 
> 
> This looks like a bug to me. Swift is 0.94 swift-r7091 cog-r3789.
> 
> 
> 
> Thanks,
> 
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