From d315dfb5b1a0852d8665ef88042a9272d0b14ac5 Mon Sep 17 00:00:00 2001
From: Magnus Holmgren <magnushol@gmail.com>
Date: Tue, 19 Jul 2005 20:43:21 +0000
Subject: Made Win32 thread management similar to the X11 one (previously
 yield() could make a thread stop, seemingly forever).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7202 a1c6a512-1295-4272-9138-f99709370657
---
 uisimulator/win32/kernel.c       | 12 ------------
 uisimulator/win32/thread-win32.c | 25 +++++++++++++++++++++++++
 uisimulator/win32/thread-win32.h |  1 +
 uisimulator/win32/uisw32.c       | 10 +---------
 uisimulator/win32/uisw32.h       |  1 -
 5 files changed, 27 insertions(+), 22 deletions(-)

(limited to 'uisimulator')

diff --git a/uisimulator/win32/kernel.c b/uisimulator/win32/kernel.c
index 5de436007b..8e7bb88546 100644
--- a/uisimulator/win32/kernel.c
+++ b/uisimulator/win32/kernel.c
@@ -34,18 +34,6 @@ int set_irq_level (int level)
     return (_lv = level);
 }
 
-void sim_sleep(int ticks)
-{
-    Sleep (1000 / HZ * ticks);
-}
-
-
-void yield (void)
-{
-    Sleep (1); /* prevent busy loop */
-    PostThreadMessage (GetWindowThreadProcessId (hGUIWnd,NULL), TM_YIELD, 0, 0);
-}
-
 void queue_init(struct event_queue *q)
 {
     q->read = 0;
diff --git a/uisimulator/win32/thread-win32.c b/uisimulator/win32/thread-win32.c
index ca973b6662..5c452d7735 100644
--- a/uisimulator/win32/thread-win32.c
+++ b/uisimulator/win32/thread-win32.c
@@ -17,18 +17,41 @@
  *
  ****************************************************************************/
 
+#define WINDOWS_LEAN_AND_MEAN
 #include <windows.h>
 #include "thread-win32.h"
+#include "kernel.h"
 
 HANDLE              lpThreads[256];
 int                 nThreads = 0,
                     nPos = 0;
 long                current_tick = 0;
+CRITICAL_SECTION    CriticalSection;
 
 
+void yield(void)
+{
+    LeaveCriticalSection(&CriticalSection);
+    /* Don't need a sleep here, and it can be bad, e.g., for audio playback.
+     * Increases CPU usage a lot though. Only sleep if CPU isn't boosted
+     * could be a solution.
+     */
+    /* Sleep(1); */
+    EnterCriticalSection(&CriticalSection);
+}
+
+void sim_sleep(int ticks)
+{
+    LeaveCriticalSection(&CriticalSection);
+    Sleep((1000/HZ) * ticks);
+    EnterCriticalSection(&CriticalSection);
+}
+
 DWORD WINAPI runthread (LPVOID lpParameter)
 {
+    EnterCriticalSection(&CriticalSection);
     ((void(*)())lpParameter) ();
+    LeaveCriticalSection(&CriticalSection);
     return 0;
 }
 
@@ -54,4 +77,6 @@ int create_thread(void (*fp)(void), void* sp, int stk_size)
 
 void init_threads(void)
 {
+    InitializeCriticalSection(&CriticalSection);
+    EnterCriticalSection(&CriticalSection);
 }
diff --git a/uisimulator/win32/thread-win32.h b/uisimulator/win32/thread-win32.h
index 2d26b8db21..467c47ee39 100644
--- a/uisimulator/win32/thread-win32.h
+++ b/uisimulator/win32/thread-win32.h
@@ -20,3 +20,4 @@
 extern HANDLE               lpThreads[256];
 extern int                  nPos,
                             nThreads;
+extern CRITICAL_SECTION     CriticalSection;
diff --git a/uisimulator/win32/uisw32.c b/uisimulator/win32/uisw32.c
index 02697be443..f492b9de36 100644
--- a/uisimulator/win32/uisw32.c
+++ b/uisimulator/win32/uisw32.c
@@ -262,10 +262,9 @@ int GUIDown ()
 
     DestroyWindow (hGUIWnd);
     CloseHandle (hGUIThread);
+
     for (i = 0; i < nThreads; i++)
     {
-        ResumeThread (lpThreads[i]);
-        WaitForSingleObject (lpThreads[i], 1);
         CloseHandle (lpThreads[i]);
     }
     return 0;
@@ -280,13 +279,6 @@ void GUIMessageLoop ()
     {
         TranslateMessage (&msg);
         DispatchMessage (&msg);
-        if (msg.message == TM_YIELD)
-        {
-            SuspendThread (lpThreads[nPos]);
-            if (++nPos >= nThreads)
-                nPos = 0;
-            ResumeThread (lpThreads[nPos]);
-        }
     }
 }
 
diff --git a/uisimulator/win32/uisw32.h b/uisimulator/win32/uisw32.h
index 7d46067c60..c4ce761c80 100644
--- a/uisimulator/win32/uisw32.h
+++ b/uisimulator/win32/uisw32.h
@@ -107,7 +107,6 @@ typedef unsigned short wchar_t;
 
 #endif
 
-#define TM_YIELD                    WM_USER + 101 // thread message for yield
 #define TIMER_EVENT                 0x34928340
 
 extern HWND                         hGUIWnd; // the GUI window handle
-- 
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