89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2004 Sanchez Computer Associates, 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 "mlkdef.h"
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#include "cmidef.h"
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#include "hashtab_mname.h" /* needed for cmmdef.h */
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#include "cmmdef.h"
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#include "gt_timer.h"
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#include "gtcmlkdef.h"
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#include "locklits.h"
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#include "gtcml.h"
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GBLREF connection_struct *curr_entry;
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GBLREF mlk_pvtblk *mlk_cm_root;
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GBLREF unsigned short cm_cmd_lk_ct;
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unsigned char gtcml_dolock(void)
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{
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cm_region_list *reg_walk, *bck_out;
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unsigned char return_val;
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unsigned char *ptr, laflag;
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char granted;
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ptr = curr_entry->clb_ptr->mbf;
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ptr++; /* jump over header */
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laflag = *ptr;
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return_val = CMMS_M_LKGRANTED;
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reg_walk = curr_entry->region_root;
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while (reg_walk)
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{
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reg_walk->reqnode = FALSE;
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if (reg_walk->oper & PENDING)
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{
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cm_cmd_lk_ct = reg_walk->lks_this_cmd;
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mlk_cm_root = reg_walk->lockdata;
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gtcml_lckclr();
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reg_walk->blkd = 0;
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switch(laflag)
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{
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case CM_LOCKS:
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granted = gtcml_lock(reg_walk);
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break;
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case CM_ZALLOCATES:
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granted = gtcml_zallocate(reg_walk);
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break;
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case INCREMENTAL:
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granted = gtcml_incrlock(reg_walk);
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break;
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default:
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GTMASSERT;
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}
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if (granted == GRANTED)
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{
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reg_walk->oper |= COMPLETE;
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reg_walk = reg_walk->next;
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continue;
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}
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bck_out = curr_entry->region_root;
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while (bck_out != reg_walk)
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{
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gtcml_lkbckout(bck_out);
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bck_out = bck_out->next;
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}
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if (granted != STARVED)
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{ return_val = CMMS_M_LKBLOCKED;
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break;
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}
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else
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{
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return_val = CMLCK_REQUEUE;
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break;
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}
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}
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else
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reg_walk = reg_walk->next;
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}
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return return_val;
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}
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