Multiple C threads -> one unthreaded GHC RTS
Suppose I have a C program with multiple C threads calling Haskell functions, maybe the same Haskell function too, and the GHC RTS used is the unthreaded one. What will go wrong? I ask because Cabal/cabal-install has recently added building of export-to-C shared libraries, i.e., the "foreign-library" section. It sees to all the technical details, very nice, I'm very happy about this addition, but it chooses the unthreaded GHC RTS. Thanks.
On Thu, Sep 28, 2017 at 4:57 PM, Albert Y. C. Lai
Suppose I have a C program with multiple C threads calling Haskell functions, maybe the same Haskell function too, and the GHC RTS used is the unthreaded one. What will go wrong?
I ask because Cabal/cabal-install has recently added building of export-to-C shared libraries, i.e., the "foreign-library" section. It sees to all the technical details, very nice, I'm very happy about this addition, but it chooses the unthreaded GHC RTS.
I don't expect the unthreaded RTS to be reentrant, so would expect you to need locking around calls into it to avoid the dreaded 'scheduler entered unsafely!' RTS error. And thread-local storage might be an issue. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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Albert Y. C. Lai -
Brandon Allbery