I don't think this lock is actually needed. If the process exited by the time we call shim.Process.Kill(), then the test ultimately finished. If not, wait() will return that the process died by a signal. Change-Id: I668a86583aba16fd00e0cd05071acc13059a2c42 Reviewed-on: https://boringssl-review.googlesource.com/27325 Reviewed-by: Adam Langley <agl@google.com>kris/onging/CECPQ3_patch15