| <?php |
| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| |
| $logger = new HMCLogger("Lock"); |
| $lockFile = $GLOBALS['HMC_CLUSTER_PATH']."/lockfile"; |
| $GLOBALS['fileHdl'] = 0; |
| |
| |
| function LockAcquire($suffixT = "") { |
| global $lockFile; |
| global $logger; |
| $suffix = strtolower($suffixT); |
| |
| $suffixLockFile = $lockFile; |
| if ($suffix != "") { |
| $suffixLockFile = $lockFile.".".$suffix; |
| } |
| |
| if ($suffix != "" && !file_exists($suffixLockFile)) { |
| $h = fopen($suffixLockFile, "x"); |
| if ($h !== FALSE) { |
| fclose($h); |
| } |
| } |
| |
| $logger->log_trace("About to acquire lock using $suffixLockFile for pid: " . |
| json_encode(posix_getpid())); |
| $fileHdl = fopen($suffixLockFile, "r"); |
| $GLOBALS['fileHdl'.$suffix] = $fileHdl; |
| $retval = flock($fileHdl, LOCK_EX); |
| /* Uncomment for debugging purposes |
| $e = new Exception; |
| $logger->log_trace("Acquired Lock Status for Process: " |
| . json_encode(posix_getpid()). " : ". json_encode($retval) . " backtrace: ". |
| $e->getTraceAsString()); |
| unset($e); |
| */ |
| return; |
| } |
| |
| function LockRelease($suffixT = "") { |
| global $lockFile; |
| global $logger; |
| $suffix = strtolower($suffixT); |
| |
| $suffixLockFile = $lockFile; |
| if ($suffix != "") { |
| $suffixLockFile = $lockFile.".".$suffix; |
| } |
| |
| $logger->log_trace("Trying to release lock using $suffixLockFile for process: " |
| . json_encode(posix_getpid())); |
| $fileHdl = $GLOBALS['fileHdl'.$suffix]; |
| $retval = flock($fileHdl, LOCK_UN); |
| /* Uncomment for debugging purposes |
| $e = new Exception; |
| $logger->log_trace("Released Lock Status for Process: " |
| . json_encode(posix_getpid()). " : ". json_encode($retval) . " backtrace: ". |
| $e->getTraceAsString()); |
| unset($e); |
| */ |
| } |
| |
| ?> |