commit 749c2e1761c753992fb2549e7ee912e568f563d6 Author: teor teor@torproject.org Date: Thu Sep 26 12:18:23 2019 +1000

log: explain why it is safe to leave the log mutex initialized

The log mutex is dynamically initialized, guarded by log_mutex_initialized. We don't want to destroy it, because after it is destroyed, we won't see any more logs.

If tor is re-initialized, log_mutex_initialized will still be 1. So we won't trigger any undefined behaviour by trying to re-initialize the log mutex.

Part of 31736, but committed in this branch to avoid merge conflicts. --- src/lib/log/log.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/lib/log/log.c b/src/lib/log/log.c index a9ad38fb2..eacd413a5 100644 --- a/src/lib/log/log.c +++ b/src/lib/log/log.c @@ -804,7 +804,10 @@ logs_free_all(void) }

/* We _could_ destroy the log mutex here, but that would screw up any logs - * that happened between here and the end of execution. */ + * that happened between here and the end of execution. + * If tor is re-initialized, log_mutex_initialized will still be 1. So we + * won't trigger any undefined behaviour by trying to re-initialize the + * log mutex. */ }

/** Remove and free the log entry <b>victim</b> from the linked-list