--- BasiliskII/src/Windows/timer_windows.cpp	2004/11/29 00:15:14	1.2
+++ BasiliskII/src/Windows/timer_windows.cpp	2008/01/01 09:40:34	1.8
@@ -1,7 +1,7 @@
 /*
  *  timer_windows.cpp - Time Manager emulation, Windows specific stuff
  *
- *  Basilisk II (C) 1997-2004 Christian Bauer
+ *  Basilisk II (C) 1997-2008 Christian Bauer
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -36,6 +36,9 @@
 #define USECS2TICKS(USECS) (((uint64)(USECS) * frequency) / 1000000)
 #define TICKS2USECS(TICKS) (((uint64)(TICKS) * 1000000) / frequency)
 
+// From main_windows.cpp
+extern HANDLE emul_thread;
+
 // Global variables
 static uint32 frequency;				// CPU frequency in Hz (< 4 GHz)
 static tm_time_t mac_boot_ticks;
@@ -47,7 +50,7 @@ static tm_time_t mac_now_diff;
  *  Initialize native Windows timers
  */
 
-void SysTimerInit(void)
+void timer_init(void)
 {
 	D(bug("SysTimerInit\n"));
 
@@ -195,3 +198,74 @@ void Delay_usec(uint32 usec)
 	// millisecond resolution anyway
 	Sleep(usec / 1000);
 }
+
+
+/*
+ *  Suspend emulator thread, virtual CPU in idle mode
+ */
+
+struct idle_sentinel {
+	idle_sentinel();
+	~idle_sentinel();
+};
+static idle_sentinel idle_sentinel;
+
+static int idle_sem_ok = -1;
+static HANDLE idle_sem = NULL;
+
+static HANDLE idle_lock = NULL;
+#define LOCK_IDLE WaitForSingleObject(idle_lock, INFINITE)
+#define UNLOCK_IDLE ReleaseMutex(idle_lock)
+
+idle_sentinel::idle_sentinel()
+{
+	idle_sem_ok = 1;
+	if ((idle_sem = CreateSemaphore(0, 0, 1, NULL)) == NULL)
+		idle_sem_ok = 0;
+	if ((idle_lock = CreateMutex(NULL, FALSE, NULL)) == NULL)
+		idle_sem_ok = 0;
+}
+
+idle_sentinel::~idle_sentinel()
+{
+	if (idle_lock) {
+		ReleaseMutex(idle_lock);
+		CloseHandle(idle_lock);
+	}
+	if (idle_sem) {
+		ReleaseSemaphore(idle_sem, 1, NULL);
+		CloseHandle(idle_sem);
+	}
+}
+
+void idle_wait(void)
+{
+	LOCK_IDLE;
+	if (idle_sem_ok > 0) {
+		idle_sem_ok++;
+		UNLOCK_IDLE;
+		WaitForSingleObject(idle_sem, INFINITE);
+		return;
+	}
+	UNLOCK_IDLE;
+
+	// Fallback: sleep 10 ms (this should not happen though)
+	Delay_usec(10000);
+}
+
+
+/*
+ *  Resume execution of emulator thread, events just arrived
+ */
+
+void idle_resume(void)
+{
+	LOCK_IDLE;
+	if (idle_sem_ok > 1) {
+		idle_sem_ok--;
+		UNLOCK_IDLE;
+		ReleaseSemaphore(idle_sem, 1, NULL);
+		return;
+	}
+	UNLOCK_IDLE;
+}