git.m6w6.name Git - m6w6/libmemcached/blob - libtest/wait.h

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  libtest
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 3 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22
  23 #pragma once
  24
  25 #include <unistd.h>
  26 #include <string>
  27
  28 #include <libtest/dream.h>
  29
  30 namespace libtest {
  31
  32 class Wait
  33 {
  34 public:
  35
  36   Wait(const std::string &filename, uint32_t timeout= 6) :
  37     _successful(false)
  38   {
  39     uint32_t waited;
  40     uint32_t this_wait;
  41     uint32_t retry;
  42
  43     if (filename.empty())
  44     {
  45       _successful= false;
  46       return;
  47     }
  48
  49     for (waited= 0, retry= 1; ; retry++, waited+= this_wait)
  50     {
  51       if (access(filename.c_str(), R_OK) == 0)
  52       {
  53         _successful= true;
  54         break;
  55       }
  56       else if (waited >= timeout)
  57       {
  58         break;
  59       }
  60
  61       this_wait= retry * retry / 3 + 1;
  62       libtest::dream(this_wait, 0);
  63     }
  64   }
  65
  66   bool successful() const
  67   {
  68     return _successful;
  69   }
  70
  71 private:
  72   bool _successful;
  73 };
  74
  75 } // namespace libtest