Hi,

The following code dies with a segfault :

import std.stdio, std.parallelism, std.process;

void main() {
	auto a=["hello","world","goodbye"];
	foreach(s; parallel(a,1)) {
		auto ls=executeShell("echo "~s);
		writeln(ls.output);
	}
}

both in ldc and dmd. Removing either the "parallel" or running something other than executeShell (eg. just doing a writeln) works, which suggests to me that it's something about the way executeShell is interacting with parallel.

Pulling it up in lldb, I get :
* thread #2: tid = 0x16738e6, 0x0000000100039198 test`D3std7process7environFNbNdNeZxPPa + 20, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x0000000100039198 test`D3std7process7environFNbNdNeZxPPa + 20

Any thoughts on what might be going wrong? Is executeShell somehow not threadsafe?

Thanks!
-- Nikhil

On 12/12/2013 08:33 PM, Nikhil Padmanabhan wrote:
> Hi,
>
> The following code dies with a segfault :
>
> import std.stdio, std.parallelism, std.process;
>
> void main() {
>      auto a=["hello","world","goodbye"];
>      foreach(s; parallel(a,1)) {
>          auto ls=executeShell("echo "~s);
>          writeln(ls.output);
>      }
> }

I don't know the original problem but that program works without any problem with the current dmd on github.

Ali

>
> both in ldc and dmd. Removing either the "parallel" or running something
> other than executeShell (eg. just doing a writeln) works, which suggests
> to me that it's something about the way executeShell is interacting with
> parallel.
>
> Pulling it up in lldb, I get :
> * thread #2: tid = 0x16738e6, 0x0000000100039198
> test`D3std7process7environFNbNdNeZxPPa + 20, stop reason =
> EXC_BAD_ACCESS (code=1, address=0x0)
>      frame #0: 0x0000000100039198 test`D3std7process7environFNbNdNeZxPPa
> + 20
>
> Any thoughts on what might be going wrong? Is executeShell somehow not
> threadsafe?
>
> Thanks!
> -- Nikhil

On Tuesday, 7 January 2014 at 23:12:09 UTC, Ali Çehreli wrote:
> don't know the original problem but that program works without any problem with the current dmd on github.

Works for me on dmd v2.064 (current stable) on Windows.