79 lines
4.8 KiB
C
79 lines
4.8 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2011 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 "min_max.h"
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/* Note: GT.M code *MUST*NOT* make use of the sleep() function because use of the sleep() function
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causes problems with GT.M's timers on some platforms. Specifically, the sleep() function
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causes the SIGARLM handler to be silently deleted on Solaris systems (through Solaris 9 at least).
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This leads to lost timer pops and has the potential for system hangs. The proper long sleep mechanism
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is hiber_start which can be accessed through the LONG_SLEEP macro defined in mdef.h.
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*/
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/* It has been found that on some platforms wcs_sleep(1msec) takes a lot longer than 1 msec to return. We think
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* this is because the frequency of the kernel's timer interrupt is a lot lower in older kernels at least in Linux.
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* Therefore we should never use MINSLPTIME (1msec) in sleep loops as it will result in a total loop sleep time
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* that is potentially an order of magnitude higher than the desired total sleep time. 10msec seems to work a lot
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* more effectively so use that for now until all unix kernels can support 1msec sleep granularity more accurately.
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*/
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#define MINSLPTIME 1 /* min (millisec) sleep possible thru wcs_sleep. See comment above about loop usage */
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#define MAXSLPTIME 10 /* max (millisec) sleep possible thru wcs_sleep */
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#define SLEEP_ONE_MIN 6000 /* # of wcs_sleep iterations (each max MAXSLPTIME msec) needed to wait 1 minute */
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#define MAXWTSTARTWAIT SLEEP_ONE_MIN
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#define BUF_OWNER_STUCK SLEEP_ONE_MIN
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#define UNIX_GETSPACEWAIT (BUF_OWNER_STUCK * 2)
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#define MAXGETSPACEWAIT SLEEP_ONE_MIN
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#define MAX_CRIT_TRY SLEEP_ONE_MIN
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#define MAX_BACKUP_FLUSH_TRY 650
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#define MAX_OPEN_RETRY SLEEP_ONE_MIN /* vms only: for dbfilop and others trying to open the db file */
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#define JNL_MAX_FLUSH_TRIES SLEEP_ONE_MIN
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#define JNL_FLUSH_PROG_FACTOR 2
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#define JNL_FLUSH_PROG_TRIES (JNL_MAX_FLUSH_TRIES * JNL_FLUSH_PROG_FACTOR)
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#define MAX_LCK_TRIES SLEEP_ONE_MIN /* vms only: wait in mu_rndwn_file */
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#define MAX_FSYNC_WAIT_CNT (2 * SLEEP_ONE_MIN) /* 2 mins of total wait for fsync, before GTMASSERTing */
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#define MAX_TQREAD_WAIT (4 * BUF_OWNER_STUCK) /* 4 mins of total wait for t_qread, before GTMASSERTing */
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#define PHASE2_COMMIT_SLEEP MAXSLPTIME /* 10 msec inter-iteration sleep wait for active phase2 commits */
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#define PHASE2_COMMIT_WAIT SLEEP_ONE_MIN
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#define PHASE2_COMMIT_WAIT_HTBT 8 /* = 8 heartbeats (each 8 seconds) = 64 seconds wait (used in Unix) */
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#define SLEEP_JNLQIOLOCKWAIT 1 /* 1-msec wait */
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#define MAXJNLQIOLOCKWAIT 4000 /* 4sec = 4000 1-msec waits to see if io_in_prog lock is free in wcs_flu */
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#define SLEEP_WRTLATCHWAIT 1 /* 1-msec wait */
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#define MAXWRTLATCHWAIT 1000 /* 1sec = 1000 * 1-msec time waits to see if write-latch value of a
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* cache-record becomes free (i.e. LATCH_CLEAR) in db_csh_getn() */
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#define RETRY_CASLATCH_CUTOFF 16 /* retry loop index cutoff to try performCASLatchCheck() */
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#define MAXWAIT2KILL (2 * SLEEP_ONE_MIN) /* KILLs wait for MAXWAIT2KILL minute(s) for inhibit_kills
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* to become zero */
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/* For use by spin locks, SLEEP is ms, total should be under a minute */
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#define LOCK_TRIES (50 * 4 * 1000) /* outer loop: 50 secs, 1 loop in 4 is sleep of 1 ms */
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#define LOCK_SPINS 1024 /* inner spin loop base */
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#define LOCK_SPINS_PER_4PROC 256 /* Additional lock spins for every 4 processors past first 8 */
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#define LOCK_SLEEP 1 /* very short sleep before repoll lock */
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/* To compute the maximum duration of an inner spinloop, the following macro can be
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used. The theory behind this macro is that the basic definition of LOCK_SPINS is
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good for approximately 8 processors but needs to be appropriately increased for
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each additional 4 processors.
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*/
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#define MAX_LOCK_SPINS(base, proc) (base + MAX(0, ((((proc - 7) * LOCK_SPINS_PER_4PROC) / 4))))
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/* Maximum duration (in minutes) that a process waits for the completion of read-in-progress after which
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* it stops waiting but rather continue fixing the remaining cache records. This is done to avoid
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* waiting a long time in case there are many corrupt global buffers. After waiting 1 minute each for the
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* first 4 cache-records (a wait time of 4 mins in total), we might as well stop waiting more and fix
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* the remaining crs. The value of 4 minutes was chosen because that is what t_qread currently has as its
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* maximum wait for reading a block from disk into the global buffer. */
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#define MAX_WAIT_FOR_RIP 4
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