Mercurial > noffle

annotate src/lock.c @ 58:b4e6f7f96135 noffle

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[svn] Add some intermediate variables for easier debugging in needsMark(). It seems that thread mode is sometimes not working. Changed some variable types and used some casts to avoid compiler warnings about signedness. In general, int should be used for parameters for allowing a signedness assertion in the function.
author enz
date Fri, 12 May 2000 17:52:07 +0100
parents 125d79c9e586
children 3c71e28c8eef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
43
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1 /*
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2 lock.c
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3
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4 $Id: lock.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 "lock.h"
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13 #include <errno.h>
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14 #include <ctype.h>
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15 #include <sys/types.h>
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16 #include <sys/stat.h>
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17 #include <fcntl.h>
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18
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19 #if TIME_WITH_SYS_TIME
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20 #include <sys/time.h>
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21 #include <time.h>
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22 #else
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23 #if HAVE_SYS_TIME_H
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24 #include <sys/time.h>
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25 #else
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26 #include <time.h>
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27 #endif
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28 #endif
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29
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30 #include <unistd.h>
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31 #include "configfile.h"
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32 #include "log.h"
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33 #include "database.h"
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34 #include "group.h"
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35 #include "request.h"
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36 #include "portable.h"
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37
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38 struct Lock
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39 {
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40 int lockFd;
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41 Str lockFile;
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42 } lock = { -1, "" };
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43
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44
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45 #ifdef DEBUG
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46 static Bool
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47 testLock( void )
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48 {
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49 return ( lock.lockFd != -1 );
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50 }
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51 #endif
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52
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53 static Bool
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54 waitLock( void )
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55 {
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56 int fd;
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57 struct flock l;
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58
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59 ASSERT( ! testLock() );
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60 Log_dbg( "Waiting for lock ..." );
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61 snprintf( lock.lockFile, MAXCHAR, "%s/lock/global", Cfg_spoolDir() );
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62 if ( ( fd = open( lock.lockFile, O_WRONLY | O_CREAT, 0644 ) ) < 0 )
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63 {
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64 Log_err( "Cannot open %s (%s)", lock.lockFile, strerror( errno ) );
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65 return FALSE;
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66 }
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67 l.l_type = F_WRLCK;
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68 l.l_start = 0;
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69 l.l_whence = SEEK_SET;
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70 l.l_len = 0;
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71 if ( fcntl( fd, F_SETLKW, &l ) < 0 )
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72 {
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73 Log_err( "Cannot lock %s: %s", lock.lockFile, strerror( errno ) );
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74 return FALSE;
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75 }
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76 lock.lockFd = fd;
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77 Log_dbg( "Lock successful" );
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78 return TRUE;
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79 }
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80
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81 static void
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82 releaseLock( void )
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83 {
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84 struct flock l;
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85
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86 ASSERT( testLock() );
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87 l.l_type = F_UNLCK;
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88 l.l_start = 0;
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89 l.l_whence = SEEK_SET;
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90 l.l_len = 0;
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91 if ( fcntl( lock.lockFd, F_SETLK, &l ) < 0 )
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92 Log_err( "Cannot release %s: %s", lock.lockFile,
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93 strerror( errno ) );
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94 close( lock.lockFd );
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95 lock.lockFd = -1;
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96 Log_dbg( "Releasing lock" );
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97 }
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98
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99
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100 /* Open all databases and set global lock. */
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101 Bool
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102 Lock_openDatabases( void )
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103 {
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104 if ( ! waitLock() )
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105 {
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106 Log_err( "Could not get write lock" );
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107 return FALSE;
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108 }
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109 if ( ! Db_open() )
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110 {
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111 Log_err( "Could not open database" );
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112 releaseLock();
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113 return FALSE;
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114 }
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115 if ( ! Grp_open() )
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116 {
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117 Log_err( "Could not open groupinfo" );
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118 Db_close();
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119 releaseLock();
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120 return FALSE;
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121 }
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122 if ( ! Req_open() )
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123 {
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124 Log_err( "Could not initialize request database" );
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125 Grp_close();
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126 Db_close();
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127 releaseLock();
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128 return FALSE;
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129 }
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130
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131 return TRUE;
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132 }
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133
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134
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135 /* Close all databases and release global lock. */
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136 void
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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137 Lock_closeDatabases( void )
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138 {
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139 Grp_close();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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140 Db_close();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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141 Req_close();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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142 releaseLock();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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143 }