ghc/includes/StgStorage.h

   1 /* -----------------------------------------------------------------------------
   2  * $Id: StgStorage.h,v 1.3 1999/02/05 16:02:29 simonm Exp $
   3  *
   4  * (c) The GHC Team, 1998-1999
   5  *
   6  * STG Storage Manger Interface
   7  *
   8  * ---------------------------------------------------------------------------*/
   9
  10 #ifndef STGSTORAGE_H
  11 #define STGSTORAGE_H
  12
  13 #include "Block.h"
  14
  15 extern bdescr *current_nursery;
  16
  17 /* -----------------------------------------------------------------------------
  18    Allocation area for compiled code
  19
  20    OpenNursery(hp,hplim)        Opens the allocation area, and sets hp
  21                                 and hplim appropriately.
  22
  23    CloseNursery(hp)             Closes the allocation area.
  24
  25    PleaseStopAllocating(void)   Arranges that the next call to
  26                                 ExtendNursery() will fail, triggering
  27                                 a return to the scheduler.  This is
  28                                 useful for asynchronous interupts etc.
  29    -------------------------------------------------------------------------- */
  30
  31 #define OpenNursery(hp,hplim)                           \
  32   (hp    = current_nursery->free-1,                     \
  33    hplim = current_nursery->start + BLOCK_SIZE_W - 1)
  34
  35 #define CloseNursery(hp)  (current_nursery->free = (P_)(hp)+1)
  36
  37 /* -----------------------------------------------------------------------------
  38    Trigger a GC from Haskell land.
  39    -------------------------------------------------------------------------- */
  40
  41 extern void performGC(void);
  42 extern void performGCWithRoots(void (*get_roots)(void));
  43
  44 #endif /* STGSTORAGE_H */