CMake/Source/cmFileLock.cxx

/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2014 Ruslan Baratov

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/

#include "cmFileLock.h"

#include "cmFileLockResult.h"
#include <assert.h>

// Common implementation

cmFileLock::~cmFileLock()
{
  if (!this->Filename.empty())
    {
    const cmFileLockResult result = this->Release();
    static_cast<void>(result);
    assert(result.IsOk());
    }
}

cmFileLockResult cmFileLock::Lock(
    const std::string& filename, unsigned long timeout)
{
  if (filename.empty())
    {
    // Error is internal since all the directories and file must be created
    // before actual lock called.
    return cmFileLockResult::MakeInternal();
    }

  if (!this->Filename.empty())
    {
    // Error is internal since double-lock must be checked in class
    // cmFileLockPool by the cmFileLock::IsLocked method.
    return cmFileLockResult::MakeInternal();
    }

  this->Filename = filename;
  cmFileLockResult result = this->OpenFile();
  if (result.IsOk())
    {
    if (timeout == static_cast<unsigned long>(-1))
      {
      result = this->LockWithoutTimeout();
      }
    else
      {
      result = this->LockWithTimeout(timeout);
      }
    }

  if (!result.IsOk())
    {
    this->Filename = "";
    }

  return result;
}

bool cmFileLock::IsLocked(const std::string& filename) const
{
  return filename == this->Filename;
}

#if defined(_WIN32)
# include "cmFileLockWin32.cxx"
#else
# include "cmFileLockUnix.cxx"
#endif