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Merge pull request #2737 from mstorsjo/fix-win32-threads

Fix threading on windows after c51a4ff09

--- a/codec/common/src/WelsThreadLib.cpp

+++ b/codec/common/src/WelsThreadLib.cpp

@@ -141,8 +141,11 @@

 }

 WELS_THREAD_ERROR_CODE    WelsEventSignal (WELS_EVENT* event, WELS_MUTEX *pMutex, int* iCondition) {

-  if (SetEvent (*event)) {

-    return WELS_THREAD_ERROR_OK;

+  (*iCondition) --;

+  if ((*iCondition) <= 0) {

+    if (SetEvent (*event)) {

+      return WELS_THREAD_ERROR_OK;

+    }

   }

   return WELS_THREAD_ERROR_GENERAL;

 }