1 files changed, 74 insertions, 0 deletions
diff --git a/ACE/ace/RW_Thread_Mutex.h b/ACE/ace/RW_Thread_Mutex.h
new file mode 100644
index 00000000000..ba903df4f76
--- /dev/null
+++ b/ACE/ace/RW_Thread_Mutex.h
@@ -0,0 +1,74 @@
+// -*- C++ -*-
+
+//==========================================================================
+/**
+ *  @file    RW_Thread_Mutex.h
+ *
+ *  $Id$
+ *
+ *   Moved from Synch.h.
+ *
+ *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
+ */
+//==========================================================================
+
+#ifndef ACE_RW_THREAD_MUTEX_H
+#define ACE_RW_THREAD_MUTEX_H
+#include /**/ "ace/pre.h"
+
+#include /**/ "ace/ACE_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#if !defined (ACE_HAS_THREADS)
+#  include "ace/Null_Mutex.h"
+#else /* ACE_HAS_THREADS */
+// ACE platform supports some form of threading.
+
+#include "ace/RW_Mutex.h"
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+/**
+ * @class ACE_RW_Thread_Mutex
+ *
+ * @brief Wrapper for readers/writer locks that exist within a process.
+ */
+class ACE_Export ACE_RW_Thread_Mutex : public ACE_RW_Mutex
+{
+public:
+  ACE_RW_Thread_Mutex (const ACE_TCHAR *name = 0,
+                       void *arg = 0);
+
+  /// Default dtor.
+  ~ACE_RW_Thread_Mutex (void);
+
+  /**
+   * Conditionally upgrade a read lock to a write lock.  This only
+   * works if there are no other readers present, in which case the
+   * method returns 0.  Otherwise, the method returns -1 and sets
+   * @c errno to @c EBUSY.  Note that the caller of this method *must*
+   * already possess this lock as a read lock (but this condition is
+   * not checked by the current implementation).
+   */
+  int tryacquire_write_upgrade (void);
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/RW_Thread_Mutex.inl"
+#endif /* __ACE_INLINE__ */
+
+#endif /* !ACE_HAS_THREADS */
+
+#include /**/ "ace/post.h"
+#endif /* ACE_RW_THREAD_MUTEX_H */