[Issue 11981] unittest 'host' deadlock

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11981


Stanislav Blinov <stanislav.blinov at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |stanislav.blinov at gmail.com


--- Comment #2 from Stanislav Blinov <stanislav.blinov at gmail.com> 2014-02-08 16:33:53 PST ---
Don't know how useful this could be but...

This code:

import std.concurrency;
import core.memory;
import core.thread;
import core.atomic;
import std.stdio;

// Reduced from host unittest
version(all) // version(none) avoids deadlock
{
shared uint tctor, tdtor;
static this() { auto v = atomicOp!"+="(tctor,1); writefln("  new thread %s",
v); }
static ~this() { auto v = atomicOp!"+="(tdtor,1); writefln("  cleanup %s", v);
}
}

void main()
{

    enum uint numThreads = 16;
    long i = 0;    
    while(true)
    {
        writefln("Starting run %s", i);
        shared uint finished;
        foreach(immutable t; 0..numThreads) 
        {
            spawn((shared uint* f) { atomicOp!"+="(*f, 1); }, &finished);
        }
        long n = 0;
        while (atomicLoad!(MemoryOrder.acq)(finished) != numThreads)
        {
            writefln("suspend %s", n);
            thread_suspendAll();
            writefln("resume %s", n);
            thread_resumeAll();
            ++n;
        }
        thread_joinAll();
        writefln("Run %s done", i);
        ++i;
    }
}


deadlocks in every single run on my machine (though randomly in each run).

$uname -a

Linux 3.8.0-26-generic #38-Ubuntu SMP Mon Jun 17 21:43:33 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux

$ldd --version

ldd (Ubuntu EGLIBC 2.17-0ubuntu5.1) 2.17

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