[Issue 2162] New: Access violation when threads run closures

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=2162

           Summary: Access violation when threads run closures
           Product: D
           Version: 2.016
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: bartosz at relisoft.com


Passing closures to threads might be considered an error, but the current
thread implementation virtualy encourages it. The program below behaves
erratically--the starting value of x and y inside thread functions is random
and, at leas in my environment, the program access violates. (I'm not sure how
reproducible it is).

void test(ref Thread thr1, ref Thread thr2)
{
        int x, y;
        int run1() 
        {
                writeln("Run1 ", x);
                for(int i = 0; i < 100000; ++i)
                        ++x;
                writeln("End Run1 ", x);
                return 0; 
        }
        int run2() 
        {
                writeln("Run2 ", y);
                for(int i = 0; i < 100000; ++i)
                        ++y;
                writeln("End Run2 ", y);
                return 0; 
        }
        thr1 = new Thread(&run1);
        thr2 = new Thread(&run2);
}

void main()
{
        try
        {
                Thread thr1, thr2;
                test(thr1, thr2);
                thr1.start();
                thr2.start();
                thr1.wait();
                thr2.wait();
        }
        catch(Exception e)
        {
                writeln ("Exception in main: ", e.toString);
        }
}


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