public function BackgroundProcess::lock in Background Process 6

Same name and namespace in other branches

1. 8 background_process.class.php \BackgroundProcess::lock()
2. 7.2 background_process.inc \BackgroundProcess::lock()
3. 7 BackgroundProcess.class.php \BackgroundProcess::lock()

2 calls to BackgroundProcess::lock()

BackgroundProcess::queue in ./BackgroundProcess.class.php

BackgroundProcess::start in ./BackgroundProcess.class.php

Start background process

File

./BackgroundProcess.class.php, line 45

Class for handling background processes.

Class

BackgroundProcess

BackgroundProcess class.

Code

public function lock($status = BACKGROUND_PROCESS_STATUS_LOCKED) {

  // Preliminary select to avoid unnecessary write-attempt
  if (background_process_get_process($this->handle)) {

    // watchdog('bg_process', 'Will not attempt to lock handle %handle, already exists', array('%handle' => $this->handle), WATCHDOG_NOTICE);
    return FALSE;
  }

  // "Lock" handle
  $this->start_stamp = $this->start = microtime(TRUE);
  if (!background_process_lock_process($this->handle, $status)) {

    // If this happens, we might have a race condition or an md5 clash
    watchdog('bg_process', 'Could not lock handle %handle', array(
      '%handle' => $this->handle,
    ), WATCHDOG_ERROR);
    return FALSE;
  }
  $this->exec_status = $this->status = BACKGROUND_PROCESS_STATUS_LOCKED;
  return TRUE;
}