From db171f2f9435b98f05f33fcbc0dcf0c5cc1cb917 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Thu, 24 Mar 2011 23:33:14 +0000
Subject: First pass of robust mutexes

---
 pthread_mutex_unlock.c | 158 +++++++++++++++++++++++++++++++++++--------------
 1 file changed, 114 insertions(+), 44 deletions(-)

(limited to 'pthread_mutex_unlock.c')

diff --git a/pthread_mutex_unlock.c b/pthread_mutex_unlock.c
index 9ebe4e3..7a3f009 100644
--- a/pthread_mutex_unlock.c
+++ b/pthread_mutex_unlock.c
@@ -42,6 +42,7 @@ int
 pthread_mutex_unlock (pthread_mutex_t * mutex)
 {
   int result = 0;
+  int kind;
   pthread_mutex_t mx;
 
   /*
@@ -57,60 +58,129 @@ pthread_mutex_unlock (pthread_mutex_t * mutex)
    */
   if (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
     {
-      if (mx->kind == PTHREAD_MUTEX_NORMAL)
-	{
-	  LONG idx;
+      kind = mx->kind;
 
-	  idx = (LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
-						   (LONG) 0);
-	  if (idx != 0)
+      if (kind >= 0)
+        {
+          if (kind == PTHREAD_MUTEX_NORMAL)
 	    {
-	      if (idx < 0)
-		{
-		  /*
-		   * Someone may be waiting on that mutex.
-		   */
-		  if (SetEvent (mx->event) == 0)
-		    {
-		      result = EINVAL;
-		    }
-		}
-	    }
-	  else
-	    {
-	      /*
-	       * Was not locked (so can't be owned by us).
-	       */
-	      result = EPERM;
-	    }
-	}
-      else
-	{
-	  if (pthread_equal (mx->ownerThread, pthread_self ()))
-	    {
-	      if (mx->kind != PTHREAD_MUTEX_RECURSIVE
-		  || 0 == --mx->recursive_count)
-		{
-		  mx->ownerThread.p = NULL;
+	      LONG idx;
 
-		  if ((LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
-							 (LONG) 0) < 0)
+	      idx = (LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
+						       (LONG) 0);
+	      if (idx != 0)
+	        {
+	          if (idx < 0)
 		    {
-		      /* Someone may be waiting on that mutex */
+		      /*
+		       * Someone may be waiting on that mutex.
+		       */
 		      if (SetEvent (mx->event) == 0)
-			{
-			  result = EINVAL;
-			}
+		        {
+		          result = EINVAL;
+		        }
 		    }
-		}
+	        }
 	    }
-	  else
+          else
 	    {
-	      result = EPERM;
+	      if (pthread_equal (mx->ownerThread, pthread_self()))
+	        {
+	          if (kind != PTHREAD_MUTEX_RECURSIVE
+		      || 0 == --mx->recursive_count)
+		    {
+		      mx->ownerThread.p = NULL;
+
+		      if ((LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
+							     (LONG) 0) < 0)
+		        {
+		          /* Someone may be waiting on that mutex */
+		          if (SetEvent (mx->event) == 0)
+			    {
+			      result = EINVAL;
+			    }
+		        }
+		    }
+	        }
+	      else
+	        {
+	          result = EPERM;
+	        }
 	    }
-	}
+        }
+      else
+        {
+          /* Robust types */
+          pthread_t self = pthread_self();
+          kind = -kind - 1; /* Convert to non-robust range */
+
+          /*
+           * The thread must own the lock regardless of type if the mutex
+           * is robust.
+           */
+          if (pthread_equal (mx->ownerThread, self))
+            {
+              PTW32_INTERLOCKED_COMPARE_EXCHANGE((LPLONG) &mx->robustNode->stateInconsistent,
+                                                 (LONG)PTW32_ROBUST_NOTRECOVERABLE,
+                                                 (LONG)PTW32_ROBUST_INCONSISTENT);
+              if (PTHREAD_MUTEX_NORMAL == kind)
+                {
+#if 1
+                  ptw32_robust_mutex_remove(mutex);
+#else
+                  mx->ownerThread.p = NULL;
+#endif
+
+                  if ((LONG) PTW32_INTERLOCKED_EXCHANGE((LPLONG) &mx->lock_idx,
+                                                          (LONG) 0) < 0)
+                    {
+#if 0
+                      ptw32_robust_mutex_remove(mutex, self);
+#endif
+                      /*
+                       * Someone may be waiting on that mutex.
+                       */
+                      if (SetEvent (mx->event) == 0)
+                        {
+                          result = EINVAL;
+                        }
+                    }
+                }
+              else
+                {
+                  if (kind != PTHREAD_MUTEX_RECURSIVE
+                      || 0 == --mx->recursive_count)
+                    {
+#if 1
+                      ptw32_robust_mutex_remove(mutex);
+#else
+                      mx->ownerThread.p = NULL;
+#endif
+
+                      if ((LONG) PTW32_INTERLOCKED_EXCHANGE((LPLONG) &mx->lock_idx,
+                                                            (LONG) 0) < 0)
+                        {
+#if 0
+                          ptw32_robust_mutex_remove(mutex, self);
+#endif
+                          /*
+                           * Someone may be waiting on that mutex.
+                           */
+                          if (SetEvent (mx->event) == 0)
+                            {
+                              result = EINVAL;
+                            }
+                        }
+                    }
+                }
+            }
+          else
+            {
+              result = EPERM;
+            }
+        }
     }
-  else
+  else if (mx != PTHREAD_MUTEX_INITIALIZER)
     {
       result = EINVAL;
     }
-- 
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