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Revert "Fixed deadlock in CRYPTO_THREAD_run_once for Windows"

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This reverts commit 349d1cfddcfa33d352240582a3803f2eba39d9a0.

The proposed fix is incorrect. It marks the "run_once" code as having
finished before it has. The intended semantics of run_once is that no
threads should proceed until the code has run exactly once. With this
change the "second" thread will think the run_once code has already been
run and will continue, even though it is still in progress. This could
result in a crash or other incorrect behaviour.

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Matt Caswell 2016-11-14 11:55:13 +00:00
parent e72040c1dc
commit 1fda5bc435
1 changed files with 1 additions and 1 deletions
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2
crypto/threads_win.c
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@ -78,8 +78,8 @@ int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
do {
result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
if (result == ONCE_UNINITED) {
*lock = ONCE_DONE;
init();
*lock = ONCE_DONE;
return 1;
}
} while (result == ONCE_ININIT);