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annotate src/lock.h @ 165:8ea6b5ddc5a5 noffle

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[svn] * src/lock.h,src/lock.c,src/noffle.c: Add lazy lock release. Only release the lock and close the databases if (a) another process signals us SIGUSR1 indicating it wants the lock, or (b) it is explicitly requested by a call to new function Lock_syncDatabases(). When waiting for the lock, SIGUSR1 the holding process every second. This is all an attempt to minimise the number of times we need to close and open the database. When (ha!) the database is replaced by something that can handle multiple simultaneous writers (with appropriate locking) this won't be necessary.
author bears
date Thu, 25 Jan 2001 13:38:31 +0000
parents 3c71e28c8eef
children
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1 /*
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2 lock.h
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4 Opening/Closing of the various databases: article overview database,
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5 articla database, groups database, outgoing articles database, requests
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6 database. Handles global lock.
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8 $Id: lock.h 249 2001-01-25 13:38:31Z bears $
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9 */
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11 #ifndef LOCK_H
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12 #define LOCK_H
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14 #if HAVE_CONFIG_H
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15 #include <config.h>
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16 #endif
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18 #include "common.h"
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20 enum LockRequestWait { LOCK_WAIT, LOCK_NOWAIT };
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22 /* Open all databases and set global lock. */
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23 Bool
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24 Lock_openDatabases( void );
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26 /* Close all databases and release global lock. */
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27 void
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28 Lock_closeDatabases( void );
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30 /* Ensure all databases synced to disc. */
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31 void
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32 Lock_syncDatabases( void );
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33
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34 /* Check the global lock held. */
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35 Bool
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36 Lock_gotLock( void );
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37
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38 /* Get fetch lock. */
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39 Bool
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40 Lock_getFetchLock( enum LockRequestWait wait );
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41
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42 /* Release fetch lock. */
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43 void
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44 Lock_releaseFetchLock( void );
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45
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46 /* Check the fetch lock held. */
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47 Bool
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48 Lock_fetchLock( void );
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50 #endif