[3.7] bpo-34130: Fix 2 race conditions in test_signal #8329
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test_signal.test_socket(): On Windows, sometimes even if the C signal handler succeed to write the signal number into the write end of the socketpair, the test fails with a BlockingIOError on the non-blocking read.recv(1) because the read end of the socketpair didn't receive the byte yet. Fix the race condition on Windows by setting the read end as blocking. (cherry picked from commit 99bb6df)
On Windows, sometimes test_signal.test_warn_on_full_buffer() fails to fill the socketpair buffer. In that case, the C signal handler succeed to write into the socket, it doesn't log the expected send error, and so the test fail. On Windows, the test now uses a timeout of 50 ms to fill the socketpair buffer to fix this race condition. Other changes: * Begin with large chunk size to fill the buffer to speed up the test. * Add error messages to assertion errors to more easily identify which assertion failed. * Don't set the read end of the socketpair as non-blocking. (cherry picked from commit 686b4b5)
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https://bugs.python.org/issue34130