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/* ----------------------------------------------------------------------------
*
* (c) The GHC Team 1998-2008
*
* Generational garbage collector: utilities
*
* Documentation on the architecture of the Garbage Collector can be
* found in the online commentary:
*
* http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/GC
*
* --------------------------------------------------------------------------*/
#ifndef SM_GCUTILS_H
#define SM_GCUTILS_H
BEGIN_RTS_PRIVATE
bdescr *allocBlock_sync(void);
void freeChain_sync(bdescr *bd);
void push_scanned_block (bdescr *bd, step_workspace *ws);
StgPtr todo_block_full (nat size, step_workspace *ws);
StgPtr alloc_todo_block (step_workspace *ws, nat size);
bdescr *grab_local_todo_block (step_workspace *ws);
#if defined(THREADED_RTS)
bdescr *steal_todo_block (nat s);
#endif
// Returns true if a block is partially full. This predicate is used to try
// to re-use partial blocks wherever possible, and to reduce wastage.
// We might need to tweak the actual value.
INLINE_HEADER rtsBool
isPartiallyFull(bdescr *bd)
{
return (bd->free + WORK_UNIT_WORDS < bd->start + BLOCK_SIZE_W);
}
#if DEBUG
void printMutableList (generation *gen);
#endif
// Version of recordMutableGen for use during GC. This uses the
// mutable lists attached to the current gc_thread structure, which
// are the same as the mutable lists on the Capability.
INLINE_HEADER void
recordMutableGen_GC (StgClosure *p, nat gen_no)
{
bdescr *bd;
bd = gct->mut_lists[gen_no];
if (bd->free >= bd->start + BLOCK_SIZE_W) {
bdescr *new_bd;
new_bd = allocBlock_sync();
new_bd->link = bd;
bd = new_bd;
gct->mut_lists[gen_no] = bd;
}
*bd->free++ = (StgWord)p;
}
END_RTS_PRIVATE
#endif /* SM_GCUTILS_H */
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