Revert "Fixed deadlock in CRYPTO_THREAD_run_once for Windows"

This reverts commit edc18749bd5dfb7e12513d3978f78f9b56104fd6.

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>

diff --git a/crypto/threads_win.c b/crypto/threads_win.c
index 5347c9e46bbdd24a817619d63bbde972c3e0c04a..4e0de908ee269510d8831c7110606722c50f8fe7 100644 (file)
--- a/crypto/threads_win.c
+++ b/crypto/threads_win.c
@@ -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);