|Portability||non-portable (requires concurrency)|
|FFI datatypes and operations that use or require concurrency (GHC only).
|Concurrency-based ForeignPtr operations
|These functions generalize their namesakes in the portable
Foreign.ForeignPtr module by allowing arbitrary IO actions
as finalizers. These finalizers necessarily run in a separate
thread, cf. Destructors, Finalizers and Synchronization,
by Hans Boehm, POPL, 2003.
|newForeignPtr :: Ptr a -> IO () -> IO (ForeignPtr a)|
|Turns a plain memory reference into a foreign object by associating
a finalizer - given by the monadic operation - with the reference.
The finalizer will be executed after the last reference to the
foreign object is dropped. Note that there is no guarantee on how
soon the finalizer is executed after the last reference was dropped;
this depends on the details of the Haskell storage manager. The only
guarantee is that the finalizer runs before the program terminates.
|addForeignPtrFinalizer :: ForeignPtr a -> IO () -> IO ()|
|This function adds a finalizer to the given ForeignPtr.
The finalizer will run after the last reference to the foreign object
is dropped, but before all previously registered finalizers for the
|Produced by Haddock version 0.7|