Mercurial > noffle

annotate src/online.c @ 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 125d79c9e586
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
43
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1 /*
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2 online.c
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3
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4 $Id: online.c 60 2000-05-09 22:28:38Z uh1763 $
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5 */
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6
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7 #if HAVE_CONFIG_H
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8 #include <config.h>
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9 #endif
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10
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11 #include <stdio.h>
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12 #include <unistd.h>
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13 #include "common.h"
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14 #include "configfile.h"
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15 #include "log.h"
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32ba1198c6fa [svn] * Makefile.in, configure, configure.in, docs/Makefile.in, src/Makefile.in:
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16 #include "online.h"
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17 #include "portable.h"
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19 static void
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20 fileOnline( Str s )
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21 {
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22 snprintf( s, MAXCHAR, "%s/lock/online", Cfg_spoolDir() );
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23 }
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24
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25 Bool
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26 Online_true( void )
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27 {
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28 FILE *f;
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29 Str file;
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30
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31 fileOnline( file );
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32 if ( ! ( f = fopen( file, "r" ) ) )
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33 return FALSE;
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34 fclose( f );
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35 return TRUE;
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36 }
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37
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38 void
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39 Online_set( Bool value )
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40 {
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41 FILE *f;
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42 Str file;
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43
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44 fileOnline( file );
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45 if ( value )
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46 {
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47 if ( ! ( f = fopen( file, "a" ) ) )
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48 {
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49 Log_err( "Could not create %s", file );
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50 return;
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51 }
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52 fclose( f );
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53 Log_inf( "NOFFLE is now online" );
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54 }
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55 else
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56 {
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57 if ( unlink( file ) != 0 )
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58 {
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59 Log_err( "Cannot remove %s", file );
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60 return;
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61 }
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62 Log_inf( "NOFFLE is now offline" );
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63 }
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64 }