From 1654ef4c9809ef7264db3eb9855345f5f61f01e0 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 4 Dec 2008 00:22:04 +0000
Subject: [PATCH] fix handling of abandoned mutexes in wxMutex::Wait[Timeout]()
 (#10236)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57100 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/thread.cpp | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/src/msw/thread.cpp b/src/msw/thread.cpp
index cc4d13a2e6..2a692e374d 100644
--- a/src/msw/thread.cpp
+++ b/src/msw/thread.cpp
@@ -189,7 +189,7 @@ private:
     wxMutexError LockTimeout(DWORD milliseconds);
 
     HANDLE m_mutex;
-    
+
     unsigned long m_owningThread;
     wxMutexType m_type;
 
@@ -214,7 +214,7 @@ wxMutexInternal::wxMutexInternal(wxMutexType mutexType)
     {
         wxLogLastError(_T("CreateMutex()"));
     }
-    
+
 }
 
 wxMutexInternal::~wxMutexInternal()
@@ -249,18 +249,14 @@ wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
     }
 
     DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds);
-    if ( rc == WAIT_ABANDONED )
-    {
-        // the previous caller died without releasing the mutex, but now we can
-        // really lock it
-        wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED"));
-
-        // use 0 timeout, normally we should always get it
-        rc = ::WaitForSingleObject(m_mutex, 0);
-    }
-
     switch ( rc )
     {
+        case WAIT_ABANDONED:
+            // the previous caller died without releasing the mutex, so even
+            // though we did get it, log a message about this
+            wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED"));
+            // fall through
+
         case WAIT_OBJECT_0:
             // ok
             break;
@@ -268,7 +264,6 @@ wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
         case WAIT_TIMEOUT:
             return wxMUTEX_TIMEOUT;
 
-        case WAIT_ABANDONED:        // checked for above
         default:
             wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
             // fall through
@@ -279,11 +274,11 @@ wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
     }
 
     if (m_type == wxMUTEX_DEFAULT)
-    { 
+    {
         // required for checking recursiveness
         m_owningThread = wxThread::GetCurrentId();
     }
-    
+
     return wxMUTEX_NO_ERROR;
 }