Re: what are global data objects?
Daniel wrote:
The thread modifier might be specified only on data items with static
extent.
"data items" as opposed to "code items" (aka functions).
This includes global data objects (both static and extern), local
static objects, and static data members of C++ classes.
What does it mean when it refers to "global data objects"? Does that
refer to instances of objects of classes, or does it refer to struct
variables?
Both. The important thing is the first sentence. You can _not_ apply
the 'thread' attribute to e.g. functions, memberfunctions (code) or to
local automatic variables and variables allocated from the heap (nonstatic
extent).
Further, and there the wording is actually bad, the "global data objects"
should be replaced with "namespace scope data objects" (with the global
namespace just being one of the possible namespaces). Well, at least I
guess that the compiler can handle the 'thread' attribute on objects in a
namespace other than the global one. In any case, those also have static
extent as required in the first sentence.
Uli
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