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digitalmars.D.bugs - [Issue 6224] New: Make a read-only public ownerTid property for std.concurrency

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6224

           Summary: Make a read-only public ownerTid property for
                    std.concurrency
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



14:39:31 PDT ---
I need a way to get the Tid of the thread that spawned the current thread.

I've had this kind of bug creep into my code:

__gshared Tid mainThread;
__gshared Tid workThread;

workThreadFoo()
{
   workThread.send("data");  // Bug: Meant to be mainThread.send
}

mainThreadFoo()
{
    mainThread = thisTid;
    workThread = spawn(&workThreadFoo);
}

This can be taken care of with this workaround:

workThreadFoo()
{
   Tid mainThread = receiveOnly!Tid();
   // workThread.send("data");  // Now this can't creep in

   mainThread.send("data");     // correct
}

mainThreadFoo()
{
    Tid workThread = spawn(&workThreadFoo);
    workThread.send(thisTid);
}

But it would be better if I didn't have to take this extra step and instead
used:

workThreadFoo()
{
   Tid mainThread = thisTid.ownerTid;  // new read-only property
   mainThread.send("data");     // correct
   thisTid.ownerTid.send("data2");  // also correct
}

mainThreadFoo()
{
    Tid workThread = spawn(&workThreadFoo);
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6224




16:11:36 PDT ---
I forgot I can also use spawn to send the Tid, e.g.:

void workThreadFoo(Tid mainThread)
{
}

spawn(&workThreadFoo, thisTid);

It would still be nice to have a ownerTid property though, this is a feature
request. :)

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         OS/Version|Windows                     |All



15:22:35 PST ---
Ok apparently there's a global but private 'owner' Tid. The problem is this is
equal to Tid.init for the main thread since Tid is a struct. I don't think it's
wise to simply return:

/**
 * Return the Tid of the thread which
 * spawned the caller's thread.
 */
 property Tid ownerTid()
{
    return owner;
}

As calling ownerTid.send() will segfault due to mbox being null. So what should
be done instead, maybe throw an exception in ownerTid() if mbox is null?

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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15:24:33 PST ---


 The problem is this is
 equal to Tid.init for the main thread since Tid is a struct.


That wasn't worded properly. It's .init because it doesn't have a parent,
regardless of whether it's a struct or class.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull
         AssignedTo|nobody puremagic.com        |andrej.mitrovich gmail.com
            Summary|Make a read-only public     |Add an ownerTid property in
                   |ownerTid property for       |std.concurrency
                   |std.concurrency             |



15:59:50 PST ---
https://github.com/D-Programming-Language/phobos/pull/1092

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Jan 22 2013
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Commits pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/dd9b31ccaef70915c7a2b18b05d9f699fbb4ae5f
Fixes Issue 6224 - Add ownerTid() property.

https://github.com/D-Programming-Language/phobos/commit/9cb2065fe6f2302a3c47f1aff3e005de5c90c110


Issue 6224 - Add ownerTid() property.

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Mar 08 2013
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6224


Alex Rønne Petersen <alex lycus.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alex lycus.org
         Resolution|                            |FIXED


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