[Python-checkins] CVS: python/dist/src/Lib os.py,1.43,1.44

[Guido van Rossum]

Update of /cvsroot/python/python/dist/src/Lib
In directory usw-pr-cvs1:/tmp/cvs-serv17563

Modified Files:
	os.py 
Log Message:
Fix by Donn Cave for BeOS (SF #403642):

  UNIX style fork/execve/wait are not fully compatible with thread
  support on BeOS.  For Python, that means neither fork() from import
  nor import from a fork work reliably. os._execvpe() does the latter,
  importing tempfile to set up a tantalizing target for hackers. This
  patch replaces both the tempfile name generation and the exec that
  uses it, in case we're on BeOS. Need this for
  setup:distutils:execvp(); symptoms are random crashes and internal
  BeOS error messages about th name, in case we're on BeOS. It's an
  issue because setup.py + distutils calls os.execvp(); symptoms are
  random crashes during setup.py, and internal BeOS error messages
  about thread IDs.


Index: os.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/os.py,v
retrieving revision 1.43
retrieving revision 1.44
diff -C2 -r1.43 -r1.44
*** os.py	2001/03/02 06:43:49	1.43
--- os.py	2001/03/02 07:04:51	1.44
***************
*** 323,330 ****
      PATH = envpath.split(pathsep)
      if not _notfound:
!         import tempfile
!         # Exec a file that is guaranteed not to exist
!         try: execv(tempfile.mktemp(), ('blah',))
!         except error, _notfound: pass
      exc, arg = error, _notfound
      for dir in PATH:
--- 323,339 ----
      PATH = envpath.split(pathsep)
      if not _notfound:
!         if sys.platform[:4] == 'beos':
!             #  Process handling (fork, wait) under BeOS (up to 5.0)
!             #  doesn't interoperate reliably with the thread interlocking
!             #  that happens during an import.  The actual error we need
!             #  is the same on BeOS for posix.open() et al., ENOENT.
!             try: unlink('/_#.# ## #.#')
!             except error, _notfound: pass
!         else:
!             import tempfile
!             t = tempfile.mktemp()
!             # Exec a file that is guaranteed not to exist
!             try: execv(t, ('blah',))
!             except error, _notfound: pass
      exc, arg = error, _notfound
      for dir in PATH: