#13554: Allow the user to provide a C function that is called on each thread the RTS creates before running any Haskell code -------------------------------------+------------------------------------- Reporter: dobenour | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: 8.4.1 Component: Runtime | Version: 8.0.1 System | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Currently, it is very difficult to use the MySQL/MariaDB client library with Haskell. One must use bound threads, which comes at a performance penalty. The reason is that the underlying library requires a certain initialization function to be called on each OS thread before any other functions are called. Similarly, it is difficult to optimally use libcurl with GHC. The best- performing way to use libcurl is to have one multi handle per thread and to use `curl_multi_socket_action` to respond to events. This is currently not possible from Haskell, at least not easily. (There are other issues with using libcurl from Haskell; most notably libcurl’s event support makes heavy use of callbacks, which are slow, to tell the application which file descriptors to wait for. But that is a separate issue.) Setting milestone to 8.4.1 because I don’t think that this is difficult. This is a feature requ -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13554 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler