58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
|
/****************************************************************
|
||
|
|
* *
|
||
|
|
* Copyright 2001, 2004 Sanchez Computer Associates, 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 "cmidef.h"
|
||
|
|
#include "hashtab_mname.h" /* needed for cmmdef.h */
|
||
|
|
#include "cmmdef.h"
|
||
|
|
#include "mlkdef.h"
|
||
|
|
#include "gtcmtr_protos.h"
|
||
|
|
#include "gt_timer.h"
|
||
|
|
#include "gtcmlkdef.h"
|
||
|
|
#include "gtcml.h"
|
||
|
|
|
||
|
|
GBLREF connection_struct *curr_entry;
|
||
|
|
|
||
|
|
bool gtcmtr_lkacquire(void)
|
||
|
|
{
|
||
|
|
unsigned char *ptr, return_val, action, incr;
|
||
|
|
cm_region_list *reg_walk;
|
||
|
|
|
||
|
|
if (*curr_entry->clb_ptr->mbf == CMMS_L_LKCANCEL)
|
||
|
|
return CM_NOOP;
|
||
|
|
|
||
|
|
ptr = curr_entry->clb_ptr->mbf;
|
||
|
|
assert(*ptr == CMMS_L_LKACQUIRE || *ptr == CMMS_L_LKCANCEL);
|
||
|
|
|
||
|
|
if (curr_entry->transnum == curr_entry->lk_cancel)
|
||
|
|
return_val = gtcml_lkcancel();
|
||
|
|
else if (curr_entry->transnum == curr_entry->last_cancelled)
|
||
|
|
{ /* LKACQUIRE arrived at the server after the INT CANCEL message for the same lock transaction; discard LKACQUIRE message;
|
||
|
|
no need to respond to stale LKACQUIRE message */
|
||
|
|
return CM_READ; /* post a read for future messages from client */
|
||
|
|
} else
|
||
|
|
{
|
||
|
|
curr_entry->state |= CMMS_L_LKACQUIRE;
|
||
|
|
return_val = gtcml_dolock();
|
||
|
|
|
||
|
|
if ((curr_entry->transnum == curr_entry->lk_cancel) ||
|
||
|
|
(return_val == CMMS_M_LKBLOCKED) ||
|
||
|
|
(return_val == CMLCK_REQUEUE))
|
||
|
|
return CM_NOOP;
|
||
|
|
}
|
||
|
|
|
||
|
|
curr_entry->state &= ~CMMS_L_LKACQUIRE;
|
||
|
|
curr_entry->clb_ptr->cbl = 1;
|
||
|
|
if (*ptr == CMMS_L_LKACQUIRE)
|
||
|
|
*ptr = return_val;
|
||
|
|
return CM_WRITE;
|
||
|
|
}
|