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annotate src/lock.c @ 127:3c71e28c8eef noffle

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[svn] Release-1-0 mergedocs/NOTES
author bears
date Tue, 25 Jul 2000 13:14:54 +0100
parents 125d79c9e586
children 8ea6b5ddc5a5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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43
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1 /*
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2 lock.c
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3
127
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4 $Id: lock.c 183 2000-07-25 12:14:54Z bears $
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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 const char *name;
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41 int lockFd;
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42 Str lockFile;
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43 };
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44
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45 struct Lock globalLock = { "global", -1, "" };
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46 struct Lock fetchLock = { "fetch", -1, "" };
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47
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48 /* Check the global lock held. */
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49 static Bool
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50 gotLock( struct Lock *lock )
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51 {
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52 return ( lock->lockFd != -1 );
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53 }
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54
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55 static Bool
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56 waitLock( struct Lock *lock, enum LockRequestWait wait )
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57 {
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58 int fd;
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59 struct flock l;
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60
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61 ASSERT( ! gotLock( lock ) );
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62 Log_dbg( "Waiting for lock %s ...", lock->name );
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63 if ( lock->lockFile[ 0 ] == '\0' )
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64 snprintf( lock->lockFile, MAXCHAR, "%s/lock/%s",
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65 Cfg_spoolDir(), lock->name );
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66 if ( ( fd = open( lock->lockFile, O_WRONLY | O_CREAT, 0644 ) ) < 0 )
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67 {
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68 Log_err( "Cannot open %s (%s)", lock->lockFile, strerror( errno ) );
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69 return FALSE;
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70 }
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71 l.l_type = F_WRLCK;
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72 l.l_start = 0;
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73 l.l_whence = SEEK_SET;
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74 l.l_len = 0;
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75 if ( wait == LOCK_WAIT )
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76 {
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77 if ( fcntl( fd, F_SETLKW, &l ) < 0 )
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78 {
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79 Log_err( "Cannot lock %s: %s", lock->lockFile, strerror( errno ) );
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80 close( lock->lockFd );
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81 return FALSE;
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82 }
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83 }
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84 else
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85 {
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86 if ( fcntl( fd, F_SETLK, &l ) < 0 )
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87 {
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88 close( lock->lockFd );
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89 return FALSE;
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90 }
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91 }
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92
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93 lock->lockFd = fd;
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94 Log_dbg( "Lock successful" );
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95 return TRUE;
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96 }
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97
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98 static void
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99 releaseLock( struct Lock *lock )
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100 {
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101 struct flock l;
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102
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103 ASSERT( gotLock( lock ) );
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104 l.l_type = F_UNLCK;
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105 l.l_start = 0;
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106 l.l_whence = SEEK_SET;
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107 l.l_len = 0;
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108 if ( fcntl( lock->lockFd, F_SETLK, &l ) < 0 )
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109 Log_err( "Cannot release %s: %s", lock->lockFile,
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110 strerror( errno ) );
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111 close( lock->lockFd );
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112 lock->lockFd = -1;
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113 Log_dbg( "Releasing lock" );
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114 }
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115
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116
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117 /* Open all databases and set global lock. */
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118 Bool
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119 Lock_openDatabases( void )
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120 {
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121 if ( ! waitLock( &globalLock, LOCK_WAIT ) )
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122 {
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123 Log_err( "Could not get write lock" );
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124 return FALSE;
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125 }
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126 if ( ! Db_open() )
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127 {
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128 Log_err( "Could not open database" );
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129 releaseLock( &globalLock );
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130 return FALSE;
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131 }
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132 if ( ! Grp_open() )
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133 {
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134 Log_err( "Could not open groupinfo" );
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135 Db_close();
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136 releaseLock( &globalLock );
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137 return FALSE;
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138 }
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139 if ( ! Req_open() )
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140 {
127
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141 Log_err( "Could not initialize request database" );
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142 Grp_close();
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143 Db_close();
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144 releaseLock( &globalLock );
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145 return FALSE;
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146 }
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147
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148 return TRUE;
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149 }
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150
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151
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152 /* Close all databases and release global lock. */
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153 void
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154 Lock_closeDatabases( void )
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155 {
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156 Grp_close();
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157 Db_close();
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158 Req_close();
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159 releaseLock( &globalLock );
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160 }
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161
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162 /* Check the global lock held. */
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163 Bool
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164 Lock_gotLock( void )
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165 {
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166 return gotLock( &globalLock );
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167 }
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168
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169 /* Get fetch lock. */
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170 Bool
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171 Lock_getFetchLock( enum LockRequestWait wait )
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172 {
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173 return waitLock( &fetchLock, wait );
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174 }
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175
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176 /* Release fetch lock. */
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177 void
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178 Lock_releaseFetchLock( void )
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179 {
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180 releaseLock( &fetchLock );
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181 }
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182
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183 /* Check the fetch lock held. */
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184 Bool
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185 Lock_fetchLock( void )
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186 {
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187 return gotLock( &fetchLock );
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188 }
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189