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Multiple concurrent joins with a running thread suffer from a race condition that allows concurrent join calls to perform concurrent arch specific join calls, which is UB on POSIX, or to concurrently execute join and terminate calls. As soon as a thread T1 exists, one of the threads that joins with T1 is selected to perform the join, the remaining ones await completion. Once completed, the remaining calls immediately return. If the join failed, another thread is selected to attempt the join operation. Forcefully terminating a thread that is in the process of joining another thread is not supported. Common code from thread_posix and thread_win was refactored to use common wrapper that handles synchronization. Signed-off-by: Čestmír Kalina <ckalina@redhat.com> Reviewed-by: Hugo Landau <hlandau@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19433) |
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