beremiz: doc/about.ru.html@d7f474d10210

fix issue with sometimes wrong return code of ProcessLogger

As a result of wrong return code Beremiz gives folowing traceback:
Traceback (most recent call last):
File "./Beremiz.py", line 850, in OnMenu
getattr(self.CTR, method)()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 925, in _Build
IECGenRes = self._Generate_SoftPLC()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 568, in _Generate_SoftPLC
return self._Compile_ST_to_SoftPLC()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 661, in _Compile_ST_to_SoftPLC
C_files.remove("POUS.c")
ValueError: list.remove(x): x not in list

The problem is that both threads (for reading stdout and stderr) call self.Proc.poll(),
that updates internal returncode field. This call is done without any locking and the first thread gets correct result,
but other gets 0 as retval. If 0 gets thread, that afterwards calls callback finish, then wrong return code is returned
to the parent. Now only the thread with a callback polls for the return code, other thread just checked local value.

Additionally function spin() waits now until all threads finish reading their pipes, so the results are always correct.

<!DOCTYPE html>
<HTML lang="ru">
  <HEAD><meta charset="utf-8" http-equiv="Content-Type" content="text/html; charset=utf-8">
    <TITLE>О Beremiz</TITLE>
  </HEAD>
  <BODY>
    <CENTER>
      <IMG SRC="../images/splash.png">
      <BR><BR>
      <font size="3">Beremiz - это свободное программное обеспечение для автоматизации.</font>
      <BR><BR>
      <a href="http://www.beremiz.org/">http://www.beremiz.org/</a>
      <BR><BR>
      <TABLE border="0">
        <TR>
          <TD align="right" valign="top">
            Спонсор разработки:
          </TD>
          <TD align="left" valign="top">
            Университет Порту<BR>
            <a href="http://www.fe.up.pt/si/web_page.inicial">http://www.fe.up.pt/si/web_page.inicial</a>
          </TD>
        </TR>
      </TABLE>
    </CENTER>
  </BODY>
</HTML>

author	Andrey Skvortsov <andrej.skvortzov@gmail.com>
	Thu, 28 Apr 2016 13:05:57 +0300
changeset 1507	d7f474d10210
parent 1500	007588fb6549
child 1513	b7b8d29e2a2d
permissions	-rw-r--r--