static ctors in shared libs
bitwise via Digitalmars-d
digitalmars-d at puremagic.com
Thu Mar 17 13:27:39 PDT 2016
I've been doing some work on shared libraries for OSX, and have
come across a potential problem, which I'm not sure what to do
with.
Currently, when a thread is spawned, that thread calls all the
TLS ctors, then runs the thread entry point function, and finally
calls the TLS dtors before the thread terminates.
Example, for windows:
https://github.com/D-Programming-Language/druntime/blob/15a227477a344583c4748d95492703901417f4f8/src/core/thread.d#L236
So, the question is, how do dynamic libraries interact here?
Example: A dynamic library contains D modules with TLS ctors. If
I start a few threads, and then load a dynamic library, shouldn't
the TLS ctors in the dynamic library be called for each running
thread? If my assumption is correct, the next question is, how do
you do this?
I don't think you can hijack each thread and have it run the TLS
ctors, and you can run them all from the thread loading the
shared library because of synchronization issues. So what's the
solution? Should TLS ctors in dynamic libraries simply be
specified not to run, or could they somehow be run lazily at the
first TLS access in a dynamic library?
Any thoughts on this would be appreciated.
Thanks,
Bit
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