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