fis-gtm/sr_port/mlk_tree_wake_children.c

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/****************************************************************
* *
* Copyright 2001, 2009 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "mlkdef.h"
#include "mlk_shrblk_delete_if_empty.h"
#include "mlk_tree_wake_children.h"
#include "mlk_wake_pending.h"
GBLREF uint4 process_id;
int mlk_tree_wake_children(mlk_ctldata_ptr_t ctl,
mlk_shrblk_ptr_t d,
gd_region *reg)
{
/* Note: should add infinite loop check */
mlk_shrblk_ptr_t b, bhead, bnext;
bool gotone, gotone_in_subtree, delete_status;
int4 lcnt = 0, max_loop_tries;
gotone = FALSE;
max_loop_tries = (int4)(((sm_uc_ptr_t)R2A(ctl->subtop) - (sm_uc_ptr_t)ctl) / SIZEOF(mlk_shrblk));
/* although more than the actual, it is better than underestimating */
for (bhead = b = d , bnext = NULL; bnext != bhead && max_loop_tries > lcnt; lcnt++)
{
delete_status = FALSE;
assert(!b->owner || b->owner == process_id);
/* do not call mlk_tree_wake_children/mlk_wake_pending on "b" if b->owner is non-zero.
* for comments on why, see comments about d->owner in mlk_wake_pending.c
*/
gotone_in_subtree = (b->children && !b->owner)
? mlk_tree_wake_children(ctl, (mlk_shrblk_ptr_t)R2A(b->children), reg)
: FALSE;
bnext = (mlk_shrblk_ptr_t)R2A(b->rsib);
if (!gotone_in_subtree && b->pending && !b->owner)
{
mlk_wake_pending(ctl, b, reg);
gotone = TRUE;
} else
delete_status = mlk_shrblk_delete_if_empty(ctl, b);
if (delete_status && b == bhead)
{
bhead = b = (b == bnext) ? NULL : bnext;
bnext = NULL;
} else
b = bnext;
gotone |= gotone_in_subtree;
}
return gotone;
}