From b0cf9efa6afeb8a7dbddf124dae173a2d633c801 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Fri, 1 Oct 2004 07:17:09 +0000
Subject: Mutex speedups

---
 pthread_mutex_trylock.c | 47 +++++++++++++++++++++++------------------------
 1 file changed, 23 insertions(+), 24 deletions(-)

(limited to 'pthread_mutex_trylock.c')

diff --git a/pthread_mutex_trylock.c b/pthread_mutex_trylock.c
index 6f137f0..bba8ed2 100644
--- a/pthread_mutex_trylock.c
+++ b/pthread_mutex_trylock.c
@@ -44,10 +44,9 @@ pthread_mutex_trylock (pthread_mutex_t * mutex)
   int result = 0;
   pthread_mutex_t mx;
 
-  if (mutex == NULL || *mutex == NULL)
-    {
-      return EINVAL;
-    }
+  /*
+   * Let the system deal with invalid pointers.
+   */
 
   /*
    * We do a quick check to see if we need to do more work
@@ -57,36 +56,36 @@ pthread_mutex_trylock (pthread_mutex_t * mutex)
    */
   if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
     {
-      result = ptw32_mutex_check_need_init (mutex);
+      if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
+	{
+	  return (result);
+	}
     }
 
   mx = *mutex;
 
-  if (result == 0)
+  if ((PTW32_INTERLOCKED_LONG) -1 ==
+      ptw32_interlocked_compare_exchange ((PTW32_INTERLOCKED_LPLONG) &
+					  mx->lock_idx,
+					  (PTW32_INTERLOCKED_LONG) 0,
+					  (PTW32_INTERLOCKED_LONG) -1))
     {
-      if ((PTW32_INTERLOCKED_LONG) PTW32_MUTEX_LOCK_IDX_INIT ==
-	  ptw32_interlocked_compare_exchange ((PTW32_INTERLOCKED_LPLONG) &
-					      mx->lock_idx,
-					      (PTW32_INTERLOCKED_LONG) 0,
-					      (PTW32_INTERLOCKED_LONG)
-					      PTW32_MUTEX_LOCK_IDX_INIT))
+      if (mx->kind != PTHREAD_MUTEX_NORMAL)
 	{
 	  mx->recursive_count = 1;
-	  mx->ownerThread = (mx->kind != PTHREAD_MUTEX_FAST_NP
-			     ? pthread_self ()
-			     : (pthread_t) PTW32_MUTEX_OWNER_ANONYMOUS);
+	  mx->ownerThread = pthread_self ();
+	}
+    }
+  else
+    {
+      if (mx->kind == PTHREAD_MUTEX_RECURSIVE &&
+	  pthread_equal (mx->ownerThread, pthread_self ()))
+	{
+	  mx->recursive_count++;
 	}
       else
 	{
-	  if (mx->kind == PTHREAD_MUTEX_RECURSIVE_NP &&
-	      pthread_equal (mx->ownerThread, pthread_self ()))
-	    {
-	      mx->recursive_count++;
-	    }
-	  else
-	    {
-	      result = EBUSY;
-	    }
+	  result = EBUSY;
 	}
     }
 
-- 
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