1 files changed, 124 insertions, 0 deletions
diff --git a/include/lldb/Host/Condition.h b/include/lldb/Host/Condition.h
new file mode 100644
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+++ b/include/lldb/Host/Condition.h
@@ -0,0 +1,124 @@
+//===-- Condition.h ---------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_DBCondition_h_
+#define liblldb_DBCondition_h_
+#if defined(__cplusplus)
+
+
+#include <pthread.h>
+#include "lldb/Host/Mutex.h"
+
+namespace lldb_private {
+
+class TimeValue;
+
+//----------------------------------------------------------------------
+/// @class Condition Condition.h "lldb/Host/Condition.h"
+/// @brief A C++ wrapper class for pthread condition variables.
+///
+/// A class that wraps up a pthread condition (pthread_cond_t). The
+/// class will create a pthread condition when an instance is
+/// constructed, and detroy it when it is destructed. It also provides
+/// access to the standard pthread condition calls.
+//----------------------------------------------------------------------
+class Condition
+{
+public:
+
+    //------------------------------------------------------------------
+    /// Default constructor
+    ///
+    /// The default constructor will initialize a new pthread condition
+    /// and maintain the condition in the object state.
+    //------------------------------------------------------------------
+    Condition ();
+
+    //------------------------------------------------------------------
+    /// Destructor
+    ///
+    /// Destroys the pthread condition that the object owns.
+    //------------------------------------------------------------------
+    ~Condition ();
+
+    //------------------------------------------------------------------
+    /// Unblock all threads waiting for a condition variable
+    ///
+    /// @return
+    ///     The return value from \c pthread_cond_broadcast()
+    //------------------------------------------------------------------
+    int
+    Broadcast ();
+
+    //------------------------------------------------------------------
+    /// Unblocks one thread waiting for the condition variable
+    ///
+    /// @return
+    ///     The return value from \c pthread_cond_signal()
+    //------------------------------------------------------------------
+    int
+    Signal ();
+
+    //------------------------------------------------------------------
+    /// Wait for the condition variable to be signaled.
+    ///
+    /// The Wait() function atomically blocks the current thread
+    /// waiting on this object's condition variable, and unblocks
+    /// \a mutex. The waiting thread unblocks only after another thread
+    /// signals or broadcasts this object's condition variable.
+    ///
+    /// If \a abstime is non-NULL, this function will return when the
+    /// system time reaches the time specified in \a abstime if the
+    /// condition variable doesn't get unblocked. If \a abstime is NULL
+    /// this function will wait for an infinite amount of time for the
+    /// condition variable to be unblocked.
+    ///
+    /// The current thread re-acquires the lock on \a mutex following
+    /// the wait.
+    ///
+    /// @param[in] mutex
+    ///     The mutex to use in the \c pthread_cond_timedwait() or
+    ///     \c pthread_cond_wait() calls.
+    ///
+    /// @param[in] abstime
+    ///     An absolute time at which to stop waiting if non-NULL, else
+    ///     wait an infinite amount of time for the condition variable
+    ///     toget signaled.
+    ///
+    /// @param[out] timed_out
+    ///     If not NULL, will be set to true if the wait timed out, and
+    //      false otherwise.
+    ///
+    /// @see Condition::Broadcast()
+    /// @see Condition::Signal()
+    //------------------------------------------------------------------
+    int
+    Wait (Mutex &mutex, const TimeValue *abstime = NULL, bool *timed_out = NULL);
+
+protected:
+    //------------------------------------------------------------------
+    // Member variables
+    //------------------------------------------------------------------
+    pthread_cond_t m_condition; ///< The condition variable.
+    
+    //------------------------------------------------------------------
+    /// Get accessor to the pthread condition object.
+    ///
+    /// @return
+    ///     A pointer to the condition variable owned by this object.
+    //------------------------------------------------------------------
+    pthread_cond_t *
+    GetCondition ();
+};
+
+} // namespace lldb_private
+
+#endif  // #if defined(__cplusplus)
+#endif
+