Changed the way the emulator is shut down, fixes #1555.

src/86box.c

@@ -85,7 +85,7 @@
    and declared here instead. */
 int		dopause;		/* system is paused */
 int		doresize;			/* screen resize requested */
-int		is_quit;				/* system exit requested */
+volatile int		is_quit;				/* system exit requested */
 uint64_t	timer_freq;
 char        emu_version[200];		/* version ID string */
 
@@ -919,14 +919,8 @@ pc_close(thread_t *ptr)
 	/* Claim the video blitter. */
 	startblit();
 
-	/* Terminate the main thread. */
-	if (ptr != NULL) {
+	/* Terminate the UI thread. */
 	is_quit = 1;
-	thread_wait(ptr, -1);
-
-	/* Wait some more. */
-	plat_delay_ms(200);
-	}
 
 #if (defined(USE_DYNAREC) && defined(USE_NEW_DYNAREC))
 	codegen_close();

src/include/86box/86box.h

@@ -189,6 +189,8 @@ extern void	resub_cycles(int old_cycles);
 extern double	isa_timing;
 extern int	io_delay, framecountx;
 
+extern volatile int	cpu_thread_run;
+
 #ifdef __cplusplus
 }
 #endif

src/include/86box/plat.h

@@ -64,8 +64,8 @@ extern "C" {
 /* Global variables residing in the platform module. */
 extern int	dopause,			/* system is paused */
 		doresize,			/* screen resize requested */
-		is_quit,				/* system exit requested */
 		mouse_capture;			/* mouse is captured in app */
+extern volatile int	is_quit;				/* system exit requested */
 
 #ifdef MTR_ENABLED
 extern int tracing_on;

src/win/win.c

@@ -69,6 +69,7 @@ HANDLE		ghMutex;
 LCID		lang_id;		/* current language ID used */
 DWORD		dwSubLangID;
 int		acp_utf8;		/* Windows supports UTF-8 codepage */
+volatile int	cpu_thread_run = 1;
 
 
 /* Local data. */
@@ -487,7 +488,7 @@ main_thread(void *param)
     title_update = 1;
     old_time = GetTickCount();
     drawits = frames = 0;
-    while (!is_quit) {
+    while (!is_quit && cpu_thread_run) {
 	/* See if it is time to run a frame of code. */
 	new_time = GetTickCount();
 	drawits += (new_time - old_time);
@@ -511,7 +512,7 @@ main_thread(void *param)
 		Sleep(1);
 
 	/* If needed, handle a screen resize. */
-	if (doresize && !video_fullscreen) {
+	if (doresize && !video_fullscreen && !is_quit) {
 		if (vid_resize & 2)
 			plat_resize(fixed_size_x, fixed_size_y);
 		else
@@ -519,6 +520,8 @@ main_thread(void *param)
 		doresize = 0;
 	}
     }
+
+    is_quit = 1;
 }
 
 
@@ -551,16 +554,17 @@ do_start(void)
 void
 do_stop(void)
 {
-    is_quit = 1;
+    /* Claim the video blitter. */
+    startblit();
 
-    plat_delay_ms(100);
-
-    if (source_hwnd)
-	PostMessage((HWND) (uintptr_t) source_hwnd, WM_HAS_SHUTDOWN, (WPARAM) 0, (LPARAM) hwndMain);
+    vid_apis[vid_api].close();
 
     pc_close(thMain);
 
     thMain = NULL;
+
+    if (source_hwnd)
+	PostMessage((HWND) (uintptr_t) source_hwnd, WM_HAS_SHUTDOWN, (WPARAM) 0, (LPARAM) hwndMain);
 }
 
 

src/win/win_ui.c

@@ -477,9 +477,10 @@ plat_power_off(void)
 
     /* Cleanly terminate all of the emulator's components so as
        to avoid things like threads getting stuck. */
-    do_stop();
+    // do_stop();
+    cpu_thread_run = 0;
 
-    exit(-1);
+    // exit(-1);
 }
 
 #ifdef MTR_ENABLED
@@ -1547,10 +1548,10 @@ ui_init(int nCmdShow)
 		fatal("bRet is -1\n");
 	}
 
-	if (messages.message == WM_QUIT) {
-		is_quit = 1;
-		break;
-	}
+	/* On WM_QUIT, tell the CPU thread to stop running. That will then tell us
+	   to stop running as well. */
+	if (messages.message == WM_QUIT)
+		cpu_thread_run = 0;
 
 	if (! TranslateAccelerator(hwnd, haccel, &messages))
 	{