Interface ExtentPurgeI

  • All Superinterfaces:
    CallbackI, CallbackI.Z, Pointer
    All Known Implementing Classes:
    ExtentPurge
    Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

    @FunctionalInterface
    public interface ExtentPurgeI
    extends CallbackI.Z
    Instances of this interface may be set to the ExtentHooks struct.

    Type

    
     bool (*) (
         extent_hooks_t *extent_hooks,
         void *addr,
         size_t size,
         size_t offset,
         size_t length,
         unsigned int arena_ind
     )
    • Method Detail

      • getSignature

        default java.lang.String getSignature()
        Description copied from interface: CallbackI
        Returns the dyncall signature for this callback function. [INTERNAL API]
        Specified by:
        getSignature in interface CallbackI
        Returns:
        the dyncall signature
      • callback

        default boolean callback​(long args)
        Description copied from interface: CallbackI.Z
        Will be called by native code.
        Specified by:
        callback in interface CallbackI.Z
        Parameters:
        args - pointer to a DCArgs iterator
        Returns:
        the value to store to the result DCValue
      • invoke

        boolean invoke​(long extent_hooks,
                       long addr,
                       long size,
                       long offset,
                       long length,
                       int arena_ind)
        Extent purge hook.

        An extent purge function conforms to the extent_purge_t type and discards physical pages within the virtual memory mapping associated with an extent at given addr and size at offset bytes, extending for length on behalf of arena arena_ind. A lazy extent purge function (e.g. implemented via madvise(..., MADV_FREE)) can delay purging indefinitely and leave the pages within the purged virtual memory range in an indeterminite state, whereas a forced extent purge function immediately purges, and the pages within the virtual memory range will be zero-filled the next time they are accessed. If the function returns true, this indicates failure to purge.