[ExM Users] File race condition?

[Tim Armstrong]

I think the problem is just that the directories the file is in isn't
automatically created by write.  It probably would make sense for it to, so
I'm checking in a fix to that.

As a workaround you could just do a mkdir before you use the directory:

import io;
import sys;
import files;

main
{
    string upf_file_name = argv("f"); // e.g., -f="upf.txt"
    string upf_lines[]  = file_lines(input(upf_file_name));
    foreach s,i in upf_lines
    {
      string instance_dir = strcat(strcat("instance_",fromint(i)),"/");

      my_mkdir(instance_dir) =>
      {
        file out <strcat(instance_dir,"out.txt")>;
        file err <strcat(instance_dir,"err.txt")>;
        file tmp <strcat(instance_dir,"upf.txt")> = write(s);
      }
    }
}

app (void o) my_mkdir(string dirname) {
  "mkdir" "-p" dirname;
}


On 15 April 2015 at 20:03, Ozik, Jonathan <jozik at anl.gov> wrote:

> Hello all,
>
> I’m wondering if I’m seeing an unintended file I/O race condition or if
> I’m simply doing something wrong but I’m getting errors when trying to
> execute this script using trunk:
>
> swift-t -n 4 very_simple.swift -f=upf_small_3.txt
> (where upf_small_3.txt is a file with 3 lines)
>
> ##### very_simple.swift #####
> import io;
> import sys;
> import files;
>
> main
> {
>     string upf_file_name = argv("f"); // e.g., -f="upf.txt"
>     string upf_lines[]  = file_lines(input(upf_file_name));
>     foreach s,i in upf_lines
>     {
>       string instance_dir = strcat(strcat("instance_",fromint(i)),"/");
>
>       file out <strcat(instance_dir,"out.txt")>;
>       file err <strcat(instance_dir,"err.txt")>;
>       file tmp <strcat(instance_dir,"upf.txt")> = write(s);
>     }
> }
> ##### very_simple.swift #####
>
> The errors are:
> couldn't open "instance_1/upf.txt": no such file or directory
>     while executing
> "::open [ local_file_path $local_file ] w+ "
>     (procedure "turbine::file_write_local" line 3)
>     invoked from within
> "turbine::file_write_local v:tmp ${v:s}"
>     (procedure "__entry-call_foreign-write" line 5)
>     invoked from within
> "__entry-call_foreign-write {2  randomSeed      1,zombieStep
> 0.1,humanStep   0.5,human_count 200,zombie_count        2}
> instance_1/upf.txt {file 7 is_mapped 1}"
> Turbine worker task error in: __entry-call_foreign-write {2
>  randomSeed      1,zombieStep    0.1,humanStep   0.5,human_count
> 200,zombie_count        2} instance_1/upf.txt {file 7 is_mapped 1}
>     invoked from within
> "c::worker_loop $WORK_TYPE($mode) $keyword_args"
>     (procedure "standard_worker" line 27)
>     invoked from within
> "standard_worker $rules $startup_cmd "
>     (procedure "enter_mode_unchecked" line 5)
>     invoked from within
> "enter_mode_unchecked $rules $startup_cmd"
>     (procedure "enter_mode" line 5)
>     invoked from within
> "enter_mode $rules $startup_cmd “
>
> Jonathan
> _______________________________________________
> ExM-user mailing list
> ExM-user at lists.mcs.anl.gov
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>
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