http://d.puremagic.com/issues/show_bug.cgi?id=6747
Summary: Implicitly allowing objects which contain delegates to
be shared/immutable can cause races
Product: D
Version: D2
Platform: Other
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: schvei...@yahoo.com
--- Comment #0 from Steven Schveighoffer <schvei...@yahoo.com> 2011-09-30
10:54:04 PDT ---
Consider this code:
class Foo
{
this(ref int _i) { dg = (){return _i;} }
ref int delegate() dg;
}
immutable Foo f;
int notShared;
shared static this()
{
f = new Foo(notShared);
}
Since f is implicitly shared, it provides access to notShared from the main
thread's local storage without protections (locks or immutable guarantees).
All one has to do is call the delegate dg.
I think in order to prevent this from accidentally happening, you should be
required to cast to either shared or immutable a delegate or anything that
contains a delegate (directly or indirectly).
The same issue occurs with shared.
This is related to bug 6741
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