92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2012 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 <errno.h>
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#include <signal.h> /* for VSIG_ATOMIC_T type */
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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 "filestruct.h"
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#include "gtmsiginfo.h"
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#include "mutex.h"
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#include "deferred_signal_handler.h"
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#include "have_crit.h"
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#include "caller_id.h"
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#include "jnl.h"
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GBLREF volatile int4 crit_count;
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GBLREF uint4 process_id;
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GBLREF volatile int suspend_status;
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GBLREF node_local_ptr_t locknl;
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GBLREF volatile int4 gtmMallocDepth; /* Recursion indicator */
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GBLREF jnl_gbls_t jgbl;
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error_def(ERR_CRITRESET);
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error_def(ERR_DBCCERR);
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/* Note about usage of this function : Create dummy gd_region, gd_segment, file_control,
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* unix_db_info, sgmnt_addrs, and allocate mutex_struct (and NUM_CRIT_ENTRY * mutex_que_entry),
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* mutex_spin_parms_struct, and node_local in shared memory. Initialize the fields as in
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* jnlpool_init(). Pass the address of the dummy region as argument to this function.
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*/
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void rel_lock(gd_region *reg)
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{
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unix_db_info *udi;
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sgmnt_addrs *csa;
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enum cdb_sc status;
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udi = FILE_INFO(reg);
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csa = &udi->s_addrs;
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/* Assert that we never come into rel_lock with hold_onto_crit being TRUE. The only exception is for online rollback
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* when it is done with the actual rollback and is now in mur_close_files to release crit. At this point it will have
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* hold_onto_crit set to TRUE.
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*/
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assert(!csa->hold_onto_crit || (process_exiting && jgbl.onlnrlbk));
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if (csa->now_crit)
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{
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assert(0 == crit_count);
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crit_count++; /* prevent interrupts */
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assert(csa->nl->in_crit == process_id || csa->nl->in_crit == 0);
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CRIT_TRACE(crit_ops_rw); /* see gdsbt.h for comment on placement */
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csa->nl->in_crit = 0;
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DEBUG_ONLY(locknl = csa->nl;) /* for DEBUG_ONLY LOCK_HIST macro */
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/* As of 10/07/98, crashcnt field in mutex_struct is not changed by any function for the dummy region */
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status = mutex_unlockw(reg, 0);
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DEBUG_ONLY(locknl = NULL;) /* restore "locknl" to default value */
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if (status != cdb_sc_normal)
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{
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csa->now_crit = FALSE;
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crit_count = 0;
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if (status == cdb_sc_critreset)
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rts_error(VARLSTCNT(4) ERR_CRITRESET, 2, REG_LEN_STR(reg));
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else
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{
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assert(status == cdb_sc_dbccerr);
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rts_error(VARLSTCNT(4) ERR_DBCCERR, 2, REG_LEN_STR(reg));
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}
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return;
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}
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crit_count = 0;
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} else
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{
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CRIT_TRACE(crit_ops_nocrit);
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}
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/* Now that crit for THIS region is released, check if deferred signal/exit handling can be done and if so do it */
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DEFERRED_EXIT_HANDLING_CHECK;
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if ((DEFER_SUSPEND == suspend_status) && OK_TO_INTERRUPT)
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suspend();
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}
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