1 files changed, 101 insertions, 41 deletions

diff --git a/winsup/cygwin/threaded_queue.h b/winsup/cygwin/threaded_queue.h
index b330d96ac..5b6fddc42 100755
--- a/winsup/cygwin/threaded_queue.h
+++ b/winsup/cygwin/threaded_queue.h
@@ -1,67 +1,127 @@
 /* threaded_queue.h
 
-   Copyright 2001 Red Hat Inc.
+   Copyright 2001, 2002 Red Hat Inc.
 
    Written by Robert Collins <rbtcollins@hotmail.com>
 
-   This file is part of Cygwin.
+This file is part of Cygwin.
 
-   This software is a copyrighted work licensed under the terms of the
-   Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
-   details. */
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
 
 #ifndef _THREADED_QUEUE_
 #define _THREADED_QUEUE_
 
+/*****************************************************************************/
+
 /* a specific request */
 
 class queue_request
 {
-  public:
-    class queue_request *next;
-    virtual void process ();
-    queue_request();
+public:
+  queue_request *_next;
+
+  queue_request () : _next (NULL) {}
+  virtual ~queue_request ();
+
+  virtual void process () = 0;
 };
 
+/*****************************************************************************/
 
-typedef DWORD WINAPI threaded_queue_thread_function (LPVOID);
-/* parameters for a request finding and submitting loop */
+/* a queue to allocate requests from n submission loops to x worker threads */
 
-class queue_process_param
+class queue_submission_loop;
+
+class threaded_queue
 {
-  public:
-    bool start (threaded_queue_thread_function *, class threaded_queue *);
-    void stop ();
-    bool running;
-    long int shutdown;
-    class queue_process_param * next;
-    class threaded_queue *queue;
-    queue_process_param (bool ninterruptible);
-    ~queue_process_param ();
-    bool interruptible;
-    HANDLE interrupt;
-    HANDLE hThread;
-    DWORD tid;
+public:
+  threaded_queue (size_t initial_workers = 1);
+  ~threaded_queue ();
+
+  void add_submission_loop (queue_submission_loop *);
+
+  bool running () const { return _running; }
+
+  bool start ();
+  bool stop ();
+
+  void add (queue_request *);
+
+private:
+  long _workers_count;
+  bool _running;
+
+  queue_submission_loop *_submitters_head;
+
+  long _requests_count;		// Informational only.
+  queue_request *_requests_head;
+
+  CRITICAL_SECTION _queue_lock;
+  HANDLE _requests_sem;		// == _requests_count
+
+  static DWORD WINAPI start_routine (LPVOID /* this */);
+
+  void create_workers (size_t initial_workers);
+  void worker_loop ();
 };
 
-/* a queue to allocate requests from n submission loops to x worker threads */
+/*****************************************************************************/
 
-class threaded_queue
+/* parameters for a request finding and submitting loop */
+
+class queue_submission_loop
 {
-  public:
-    CRITICAL_SECTION queuelock;
-    HANDLE event;
-    bool active;
-    queue_request * request;
-    unsigned int initial_workers;
-    unsigned int running;
-    void create_workers ();
-    void cleanup ();
-    void add (queue_request *);
-    void process_requests (queue_process_param *, threaded_queue_thread_function *);
-    threaded_queue () : active (false), request (NULL), initial_workers (1), running (0), process_head (NULL) {};
-  private:
-    queue_request *process_head;
+  friend class threaded_queue;
+
+public:
+  queue_submission_loop (threaded_queue *, bool ninterruptible);
+  virtual ~queue_submission_loop ();
+
+  bool start ();
+  bool stop ();
+
+  threaded_queue *queue () { return _queue; };
+
+protected:
+  bool _running;
+  HANDLE _interrupt_event;
+  threaded_queue *const _queue;
+
+private:
+  bool _interruptible;
+  HANDLE _hThread;
+  DWORD _tid;
+  queue_submission_loop *_next;
+
+  static DWORD WINAPI start_routine (LPVOID /* this */);
+  virtual void request_loop () = 0;
 };
 
+#ifdef __cplusplus
+
+/*---------------------------------------------------------------------------*
+ * Some type-safe versions of the various interlocked functions.
+ *---------------------------------------------------------------------------*/
+
+template <typename T> T *
+TInterlockedExchangePointer (T **lvalue, T *rvalue)
+{
+  return reinterpret_cast<T *>
+    (InterlockedExchangePointer (reinterpret_cast<void **> (lvalue),
+				 reinterpret_cast<void *> (rvalue)));
+}
+
+template <typename T> T *
+TInterlockedCompareExchangePointer (T **lvalue, T *rvalue1, T *rvalue2)
+{
+  return reinterpret_cast<T *>
+    (InterlockedCompareExchangePointer (reinterpret_cast<void **> (lvalue),
+					reinterpret_cast<void *> (rvalue1),
+					reinterpret_cast<void *> (rvalue2)));
+}
+
+#endif /* __cplusplus */
+
 #endif /* _THREADED_QUEUE_ */