APIs, to avoid a crash with the pthread implementation in RHEL 5.  Patch
by Charles-François Natali.

Patch by Sijin Joseph.

This was fixed in py3k SVN. Consider this a backport.

Wait for the child process to terminate before ending the test, so that the
regrtest cleanup code doesn't get an error when it tries to delete the
temporary CWD.

Fix the documentation.

Py_AddPendingCall() for the first signal to fix a deadlock on reentrant or
parallel calls. PyErr_SetInterrupt() writes also into the wake up file.