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Annotation of embedaddon/mtr/packet/wait_cygwin.c, revision 1.1

1.1     ! misho       1: /*
        !             2:     mtr  --  a network diagnostic tool
        !             3:     Copyright (C) 2016  Matt Kimball
        !             4: 
        !             5:     This program is free software; you can redistribute it and/or modify
        !             6:     it under the terms of the GNU General Public License version 2 as
        !             7:     published by the Free Software Foundation.
        !             8: 
        !             9:     This program is distributed in the hope that it will be useful,
        !            10:     but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            12:     GNU General Public License for more details.
        !            13: 
        !            14:     You should have received a copy of the GNU General Public License
        !            15:     along with this program; if not, write to the Free Software
        !            16:     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17: */
        !            18: 
        !            19: #include "wait.h"
        !            20: 
        !            21: #include <io.h>
        !            22: #include <stdio.h>
        !            23: #include <windows.h>
        !            24: 
        !            25: #include "command.h"
        !            26: 
        !            27: /*
        !            28:     Sleep until we receive a new probe response, a new command on the
        !            29:     command stream, or a probe timeout.  On Windows, this means that
        !            30:     we will sleep with an alertable wait, as all of these conditions
        !            31:     use I/O completion routines as notifications of these events.
        !            32: */
        !            33: void wait_for_activity(
        !            34:     struct command_buffer_t *command_buffer,
        !            35:     struct net_state_t *net_state)
        !            36: {
        !            37:     DWORD wait_result;
        !            38: 
        !            39:     /*
        !            40:        Start the command read overlapped I/O just prior to sleeping.
        !            41:        During development of the Cygwin port, there was a bug where the
        !            42:        overlapped I/O was started earlier in the mtr-packet loop, and
        !            43:        an intermediate alertable wait could leave us in this Sleep
        !            44:        without an active command read.  So now we do this here, instead.
        !            45:      */
        !            46:     start_read_command(command_buffer);
        !            47: 
        !            48:     /*  Sleep until an I/O completion routine runs  */
        !            49:     wait_result = SleepEx(INFINITE, TRUE);
        !            50: 
        !            51:     if (wait_result == WAIT_FAILED) {
        !            52:         fprintf(stderr, "SleepEx failure %d\n", GetLastError());
        !            53:         exit(EXIT_FAILURE);
        !            54:     }
        !            55: }