Patch by Akira Kitada.

On FreeBSD6, pthread_kill() doesn't work on the main thread before the creation
of the first thread. Create therefore a dummy thread (no-op) a startup to
initialize the pthread library.

Add also a test for this use case, test written by Charles-François Natali.

Patch by Francisco Martín Brugué.

The new wording is based on the comments in the code, which
match the actual behavior.

Locks are implemented using a mutex and a condition variable of the pthread
library on FreeBSD6. POSIX condition variables cannot be interrupted by signals
(see pthread_cond_wait manual page).

I didn't rename the variable because I can see no good reason
to break backward compatibility just to put an underscore in
the name.

Cannot test an empty environment on Windows: Windows requires at least the
SYSTEMROOT environment variable to start Python.

Cannot test an empty environment on Windows: Windows requires at least the
SYSTEMROOT environment variable to start Python.

Add a basic synchronization code between the child and the parent processes:
the child writes "ready" to stdout.

Mac OS X adds __CF_USER_TEXT_ENCODING variable to an empty environment. Fix
also the test on the Py_ENABLE_SHARED config varible: test that the variable is
present, don't check it's value.

Mac OS X adds __CF_USER_TEXT_ENCODING variable to an empty environment. Fix
also the test on the Py_ENABLE_SHARED config varible: test that the variable is
present, don't check it's value.

shared mode

Try also to get more informations about the Mac OS X failure: display the keys
of the environment, instead of just the number of variables.

Try also to get more informations about the Mac OS X failure: display the keys
of the environment, instead of just the number of variables.

environment variables, start with an empty environment.

variables, start with an empty environment.