Re: Calling _beginthreadex() during creation of global object (or before main() is called)
As I understand, threads begin to run after main() is entered (or perhaps
just before). If this understanding is correct, are there any pitfalls to
be expected if _beginthreadex() is called during a creation of a global
(namespace-level) object to create a running (not suspended) thread? I am
not counting on it to begin to run before its time but may this cause a
problem? (The code written as per above seems to have caused problems in
some environments with the thread creation by _beginthreadex() failing the
test for a valid handle; unfortunately I do not have any specific error
codes to hand.)
It depends on what those threads do.
Complex global initialization is never a good idea, because it is impossible
to know in which order objects in different modules are initialized. And if
an exception is thrown, you cannot even catch it.
I do not know the exact answer to your question (I would if it involved
DllMain :-) because I researched that in-depth) but this is a case of 'you
don't want to do that anyway, really'
If you can change that code, change it so that those objects are initialized
first thing in your main function.
In case of an error, _beginthreadex() sets errno with a set of codes more
limited than that GetLastError() may return. Will it make sense to obtain
a code from GetLastError() in the case of _beginthreadex()?
It depends on what went wrong. GetLastError is a Winapi function.
_beginthreadex is a CRT function. Only WinApi functions are guaranteed to
set the value that is retrieved by GetLastError.
--
Kind regards,
Bruno van Dooren
bruno_nos_pam_van_dooren@hotmail.com
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