From 076adeb0aa24e9bdc677435ddb6e444db58d5436 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Sun, 30 Aug 2009 12:07:04 +0000
Subject: Add method to clear all existing callbacks.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1642
---
 opl/opl.c          | 8 ++++++++
 opl/opl.h          | 4 ++++
 opl/opl_internal.h | 2 ++
 opl/opl_linux.c    | 1 +
 opl/opl_queue.c    | 5 +++++
 opl/opl_queue.h    | 1 +
 opl/opl_sdl.c      | 8 ++++++++
 opl/opl_timer.c    | 7 +++++++
 opl/opl_timer.h    | 1 +
 9 files changed, 37 insertions(+)

diff --git a/opl/opl.c b/opl/opl.c
index e53b5d6e..6e75c951 100644
--- a/opl/opl.c
+++ b/opl/opl.c
@@ -117,6 +117,14 @@ void OPL_SetCallback(unsigned int ms, opl_callback_t callback, void *data)
     }
 }
 
+void OPL_ClearCallbacks(void)
+{
+    if (driver != NULL)
+    {
+        driver->clear_callbacks_func();
+    }
+}
+
 void OPL_Lock(void)
 {
     if (driver != NULL)
diff --git a/opl/opl.h b/opl/opl.h
index 3413e3ab..a0998404 100644
--- a/opl/opl.h
+++ b/opl/opl.h
@@ -79,6 +79,10 @@ unsigned int OPL_ReadPort(opl_port_t port);
 
 void OPL_SetCallback(unsigned int ms, opl_callback_t callback, void *data);
 
+// Clear all OPL callbacks that have been set.
+
+void OPL_ClearCallbacks(void);
+
 // Begin critical section, during which, OPL callbacks will not be
 // invoked.
 
diff --git a/opl/opl_internal.h b/opl/opl_internal.h
index cd125122..384b96f8 100644
--- a/opl/opl_internal.h
+++ b/opl/opl_internal.h
@@ -36,6 +36,7 @@ typedef void (*opl_write_port_func)(opl_port_t port, unsigned int value);
 typedef void (*opl_set_callback_func)(unsigned int ms,
                                       opl_callback_t callback,
                                       void *data);
+typedef void (*opl_clear_callbacks_func)(void);
 typedef void (*opl_lock_func)(void);
 typedef void (*opl_unlock_func)(void);
 
@@ -48,6 +49,7 @@ typedef struct
     opl_read_port_func read_port_func;
     opl_write_port_func write_port_func;
     opl_set_callback_func set_callback_func;
+    opl_clear_callbacks_func clear_callbacks_func;
     opl_lock_func lock_func;
     opl_unlock_func unlock_func;
 } opl_driver_t;
diff --git a/opl/opl_linux.c b/opl/opl_linux.c
index 4a10337f..8a61dbf7 100644
--- a/opl/opl_linux.c
+++ b/opl/opl_linux.c
@@ -92,6 +92,7 @@ opl_driver_t opl_linux_driver =
     OPL_Linux_PortRead,
     OPL_Linux_PortWrite,
     OPL_Timer_SetCallback,
+    OPL_Timer_ClearCallbacks,
     OPL_Timer_Lock,
     OPL_Timer_Unlock
 };
diff --git a/opl/opl_queue.c b/opl/opl_queue.c
index fe5f1ef8..f9d4c377 100644
--- a/opl/opl_queue.c
+++ b/opl/opl_queue.c
@@ -65,6 +65,11 @@ int OPL_Queue_IsEmpty(opl_callback_queue_t *queue)
     return queue->num_entries == 0;
 }
 
+void OPL_Queue_Clear(opl_callback_queue_t *queue)
+{
+    queue->num_entries = 0;
+}
+
 void OPL_Queue_Push(opl_callback_queue_t *queue,
                     opl_callback_t callback, void *data,
                     unsigned int time)
diff --git a/opl/opl_queue.h b/opl/opl_queue.h
index 6ead0010..2447702b 100644
--- a/opl/opl_queue.h
+++ b/opl/opl_queue.h
@@ -32,6 +32,7 @@ typedef struct opl_callback_queue_s opl_callback_queue_t;
 
 opl_callback_queue_t *OPL_Queue_Create(void);
 int OPL_Queue_IsEmpty(opl_callback_queue_t *queue);
+void OPL_Queue_Clear(opl_callback_queue_t *queue);
 void OPL_Queue_Destroy(opl_callback_queue_t *queue);
 void OPL_Queue_Push(opl_callback_queue_t *queue,
                     opl_callback_t callback, void *data,
diff --git a/opl/opl_sdl.c b/opl/opl_sdl.c
index b9d83385..ffbe6820 100644
--- a/opl/opl_sdl.c
+++ b/opl/opl_sdl.c
@@ -374,6 +374,13 @@ static void OPL_SDL_SetCallback(unsigned int ms,
     SDL_UnlockMutex(callback_queue_mutex);
 }
 
+static void OPL_SDL_ClearCallbacks(void)
+{
+    SDL_LockMutex(callback_queue_mutex);
+    OPL_Queue_Clear(callback_queue);
+    SDL_UnlockMutex(callback_queue_mutex);
+}
+
 static void OPL_SDL_Lock(void)
 {
     SDL_LockMutex(callback_mutex);
@@ -392,6 +399,7 @@ opl_driver_t opl_sdl_driver =
     OPL_SDL_PortRead,
     OPL_SDL_PortWrite,
     OPL_SDL_SetCallback,
+    OPL_SDL_ClearCallbacks,
     OPL_SDL_Lock,
     OPL_SDL_Unlock
 };
diff --git a/opl/opl_timer.c b/opl/opl_timer.c
index 62ffbd37..e254a5e2 100644
--- a/opl/opl_timer.c
+++ b/opl/opl_timer.c
@@ -202,6 +202,13 @@ void OPL_Timer_SetCallback(unsigned int ms, opl_callback_t callback, void *data)
     SDL_UnlockMutex(callback_queue_mutex);
 }
 
+void OPL_Timer_ClearCallbacks(void)
+{
+    SDL_LockMutex(callback_queue_mutex);
+    OPL_Queue_Clear(callback_queue);
+    SDL_UnlockMutex(callback_queue_mutex);
+}
+
 void OPL_Timer_Lock(void)
 {
     SDL_LockMutex(timer_mutex);
diff --git a/opl/opl_timer.h b/opl/opl_timer.h
index 26255df5..e8657a90 100644
--- a/opl/opl_timer.h
+++ b/opl/opl_timer.h
@@ -33,6 +33,7 @@ void OPL_Timer_StopThread(void);
 void OPL_Timer_SetCallback(unsigned int ms,
                            opl_callback_t callback,
                            void *data);
+void OPL_Timer_ClearCallbacks(void);
 void OPL_Timer_Lock(void);
 void OPL_Timer_Unlock(void);
 
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