undoing accidental deletion

1 files changed, 192 insertions, 0 deletions

diff --git a/ACE/ace/Mutex.h b/ACE/ace/Mutex.h
new file mode 100644
index 00000000000..e876a09d3f8
--- /dev/null
+++ b/ACE/ace/Mutex.h
@@ -0,0 +1,192 @@
+// -*- C++ -*-
+
+//==========================================================================
+/**
+ *  @file    Mutex.h
+ *
+ *  $Id$
+ *
+ *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
+ */
+//==========================================================================
+
+#ifndef ACE_MUTEX_H
+#define ACE_MUTEX_H
+
+#include /**/ "ace/pre.h"
+
+#include /**/ "ace/ACE_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/OS_NS_Thread.h"
+#include "ace/OS_NS_unistd.h"
+#include "ace/os_include/os_fcntl.h"
+
+# if !defined (ACE_DEFAULT_MUTEX_A)
+#   define ACE_DEFAULT_MUTEX_A "ACE_MUTEX"
+# endif /* ACE_DEFAULT_MUTEX_A */
+
+# if defined (ACE_HAS_WCHAR)
+#   define ACE_DEFAULT_MUTEX_W ACE_TEXT_WIDE(ACE_DEFAULT_MUTEX_A)
+# endif /* ACE_HAS_WCHAR */
+
+# define ACE_DEFAULT_MUTEX ACE_TEXT (ACE_DEFAULT_MUTEX_A)
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class ACE_Time_Value;
+
+/**
+ * @class ACE_Mutex
+ *
+ * @brief @c ACE_Mutex wrapper (valid in same process or across
+ *        processes (depending on @a TYPE flag)).  In general,
+ *        however, we recommend using @a ACE_Process_Mutex or @a
+ *        ACE_Thread_Mutex rather than @a ACE_Mutex.
+ */
+class ACE_Export ACE_Mutex
+{
+public:
+  /// Initialize the mutex.
+  ACE_Mutex (int type = USYNC_THREAD,
+             const ACE_TCHAR *name = 0,
+             ACE_mutexattr_t *arg = 0,
+             mode_t mode = ACE_DEFAULT_FILE_PERMS);
+
+  /// Implicitly destroy the mutex.
+  ~ACE_Mutex (void);
+
+  /// Explicitly destroy the mutex.
+  /**
+   * @note Only one thread should call this method since it doesn't
+   *        protect against race conditions.
+   */
+  int remove (void);
+
+  /// Acquire lock ownership (wait on queue if necessary).
+  int acquire (void);
+
+  /// Block the thread until the mutex is acquired or @a tv times out,
+  /// in which case -1 is returned and @c errno == @c ETIME.
+  /**
+   * @note @a tv is assumed  to be in "absolute" rather than
+   * "     relative" time.  The value of @a tv is updated upon return
+   *       to show the actual(absolute) acquisition time.
+   */
+  int acquire (ACE_Time_Value &tv);
+
+  /// Block the thread until the mutex is acquired or @a *tv times
+  /// out, in which case -1 is returned and @c errno == @c ETIME.
+  /**
+   * If @a tv == 0 then call @c acquire() directly.  Otherwise, block
+   * the thread until the mutex is acquired or @a tv times out, in
+   * which case -1 is returned and @c errno == @c ETIME.
+   *
+   * @note @a *tv is assumed to be in "absolute" rather than
+   *       "relative" time.  The value of @a *tv is updated upon
+   *       return to show the actual (absolute) acquisition time.
+   */
+  int acquire (ACE_Time_Value *tv);
+
+  /// Conditionally acquire lock (i.e., don't wait on queue).
+  /**
+   * @return -1 on failure.  If we "failed" because someone
+   *         else already had the lock, @c errno is set to @c EBUSY.
+   */
+  int tryacquire (void);
+
+  /// Release lock and unblock a thread at head of queue.
+  int release (void);
+
+  /// Acquire mutex ownership.
+  /**
+   * This calls @c acquire and is only here to make the @c ACE_Mutex
+   * interface consistent with the other synchronization APIs.
+   */
+  int acquire_read (void);
+
+  /// Acquire mutex ownership.
+  /**
+   * This calls @c acquire and is only here to make the @c ACE_Mutex
+   * interface consistent with the other synchronization APIs.
+   */
+  int acquire_write (void);
+
+  /// Conditionally acquire mutex (i.e., won't block).
+  /**
+   * This calls @c tryacquire and is only here to make the @c ACE_Mutex
+   * interface consistent with the other synchronization APIs.
+   *
+   * @return -1 on failure.  If we "failed" because someone else
+   *         already had the lock, @c errno is set to @c EBUSY.
+   */
+  int tryacquire_read (void);
+
+  /// Conditionally acquire mutex (i.e., won't block).
+  /**
+   * This calls @c tryacquire and is only here to make the @c ACE_Mutex
+   * interface consistent with the other synchronization APIs.
+   *
+   * @return -1 on failure.  If we "failed" because someone else
+   *         already had the lock, @c errno is set to @c EBUSY.
+   */
+  int tryacquire_write (void);
+
+  /**
+   * This is only here for consistency with the other synchronization
+   * APIs and usability with Lock adapters. Assumes the caller already has
+   * acquired the mutex and returns 0 in all cases.
+   */
+  int tryacquire_write_upgrade (void);
+
+  /// Return the underlying mutex.
+  const ACE_mutex_t &lock (void) const;
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+
+  // = This should be protected but some C++ compilers complain...
+public:
+#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
+  /// This lock resides in shared memory.
+  ACE_mutex_t *process_lock_;
+
+  /**
+   * Remember the name of the mutex if we created it so we can unlink
+   * it when we go away (only the actor that initialized the memory
+   * can destroy it).
+   */
+  const ACE_TCHAR *lockname_;
+#endif /* ACE_HAS_PTHREADS */
+
+  /// Mutex type supported by the OS.
+  ACE_mutex_t lock_;
+
+  /// Keeps track of whether @c remove has been called yet to avoid
+  /// multiple @c remove calls, e.g., explicitly and implicitly in the
+  /// destructor.  This flag isn't protected by a lock, so make sure
+  /// that you don't have multiple threads simultaneously calling
+  /// @c remove on the same object, which is a bad idea anyway.
+  bool removed_;
+
+private:
+  // Prevent assignment and initialization.
+  void operator= (const ACE_Mutex &);
+  ACE_Mutex (const ACE_Mutex &);
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/Mutex.inl"
+#endif /* __ACE_INLINE__ */
+
+#include /**/ "ace/post.h"
+
+#endif /* ACE_MUTEX_H */