1 | // |
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2 | // NamedMutex_UNIX.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/NamedMutex_UNIX.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Processes |
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8 | // Module: NamedMutex |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include "Poco/NamedMutex_UNIX.h" |
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38 | #include "Poco/Exception.h" |
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39 | #include <fcntl.h> |
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40 | #include <sys/stat.h> |
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41 | #include <errno.h> |
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42 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(_AIX) |
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43 | #include <semaphore.h> |
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44 | #else |
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45 | #include <unistd.h> |
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46 | #include <sys/types.h> |
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47 | #include <sys/ipc.h> |
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48 | #include <sys/sem.h> |
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49 | #endif |
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50 | |
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51 | |
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52 | namespace Poco { |
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53 | |
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54 | |
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55 | #if defined(linux) || defined(__CYGWIN__) |
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56 | union semun |
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57 | { |
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58 | int val; |
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59 | struct semid_ds* buf; |
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60 | unsigned short int* array; |
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61 | struct seminfo* __buf; |
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62 | }; |
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63 | #elif defined(__hpux) |
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64 | union semun |
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65 | { |
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66 | int val; |
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67 | struct semid_ds* buf; |
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68 | ushort* array; |
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69 | }; |
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70 | #endif |
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71 | |
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72 | |
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73 | NamedMutexImpl::NamedMutexImpl(const std::string& name): |
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74 | _name(name) |
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75 | { |
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76 | std::string fileName = getFileName(); |
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77 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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78 | _sem = sem_open(fileName.c_str(), O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 1); |
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79 | if ((long) _sem == (long) SEM_FAILED) |
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80 | throw SystemException("cannot create named mutex (sem_open() failed)", _name); |
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81 | #else |
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82 | int fd = open(fileName.c_str(), O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); |
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83 | if (fd != -1) |
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84 | close(fd); |
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85 | else |
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86 | throw SystemException("cannot create named mutex (lockfile)", _name); |
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87 | key_t key = ftok(fileName.c_str(), 0); |
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88 | if (key == -1) |
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89 | throw SystemException("cannot create named mutex (ftok() failed)", _name); |
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90 | _semid = semget(key, 1, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH | IPC_CREAT | IPC_EXCL); |
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91 | if (_semid >= 0) |
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92 | { |
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93 | union semun arg; |
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94 | arg.val = 1; |
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95 | semctl(_semid, 0, SETVAL, arg); |
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96 | } |
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97 | else if (errno == EEXIST) |
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98 | { |
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99 | _semid = semget(key, 1, 0); |
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100 | } |
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101 | else throw SystemException("cannot create named mutex (semget() failed)", _name); |
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102 | #endif // defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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103 | } |
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104 | |
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105 | |
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106 | NamedMutexImpl::~NamedMutexImpl() |
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107 | { |
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108 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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109 | sem_close(_sem); |
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110 | #endif |
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111 | } |
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112 | |
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113 | |
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114 | void NamedMutexImpl::lockImpl() |
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115 | { |
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116 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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117 | int err; |
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118 | do |
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119 | { |
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120 | err = sem_wait(_sem); |
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121 | } |
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122 | while (err && errno == EINTR); |
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123 | if (err) throw SystemException("cannot lock named mutex", _name); |
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124 | #else |
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125 | struct sembuf op; |
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126 | op.sem_num = 0; |
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127 | op.sem_op = -1; |
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128 | op.sem_flg = SEM_UNDO; |
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129 | int err; |
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130 | do |
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131 | { |
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132 | err = semop(_semid, &op, 1); |
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133 | } |
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134 | while (err && errno == EINTR); |
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135 | if (err) throw SystemException("cannot lock named mutex", _name); |
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136 | #endif |
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137 | } |
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138 | |
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139 | |
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140 | bool NamedMutexImpl::tryLockImpl() |
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141 | { |
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142 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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143 | return sem_trywait(_sem) == 0; |
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144 | #else |
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145 | struct sembuf op; |
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146 | op.sem_num = 0; |
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147 | op.sem_op = -1; |
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148 | op.sem_flg = SEM_UNDO | IPC_NOWAIT; |
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149 | return semop(_semid, &op, 1) == 0; |
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150 | #endif |
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151 | } |
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152 | |
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153 | |
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154 | void NamedMutexImpl::unlockImpl() |
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155 | { |
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156 | #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) |
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157 | if (sem_post(_sem) != 0) |
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158 | throw SystemException("cannot unlock named mutex", _name); |
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159 | #else |
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160 | struct sembuf op; |
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161 | op.sem_num = 0; |
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162 | op.sem_op = 1; |
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163 | op.sem_flg = SEM_UNDO; |
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164 | if (semop(_semid, &op, 1) != 0) |
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165 | throw SystemException("cannot unlock named mutex", _name); |
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166 | #endif |
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167 | } |
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168 | |
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169 | |
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170 | std::string NamedMutexImpl::getFileName() |
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171 | { |
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172 | #if defined(sun) || defined(__APPLE__) || defined(__QNX__) |
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173 | std::string fn = "/"; |
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174 | #else |
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175 | std::string fn = "/tmp/"; |
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176 | #endif |
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177 | fn.append(_name); |
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178 | fn.append(".mutex"); |
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179 | return fn; |
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180 | } |
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181 | |
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182 | |
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183 | } // namespace Poco |
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