From 8520d6111ea2b09e6a45c0f6d2b8c03199a06196 Mon Sep 17 00:00:00 2001
From: Bryce Denney <bryce@tlw.com>
Date: Mon, 12 Nov 2001 02:47:14 +0000
Subject: [PATCH] - applied november 11, 2001.  Well, I applied it, hacked it
 to move it all   into gui/ and then checked it in.

---
 bochs/patches/patch.gisburn_bochs_idle_hack | 130 --------------------
 1 file changed, 130 deletions(-)
 delete mode 100644 bochs/patches/patch.gisburn_bochs_idle_hack

diff --git a/bochs/patches/patch.gisburn_bochs_idle_hack b/bochs/patches/patch.gisburn_bochs_idle_hack
deleted file mode 100644
index 91bd0904c..000000000
--- a/bochs/patches/patch.gisburn_bochs_idle_hack
+++ /dev/null
@@ -1,130 +0,0 @@
-----------------------------------------------------------------------
-Patch name: patch.gisburn_bochs_idle_hack
-Author: Roland.Mainz@informatik.med.uni-giessen.de
-Date: Thu, 04 Oct 2001 12:47:50 +0200
-RCS Id: $Id: patch.gisburn_bochs_idle_hack,v 1.1 2001-10-04 18:37:29 bdenney Exp $
-
-Detailed description:
-I've attached a smallish "hack" to prevent that bochs always consumes
-100% CPU time - even if the "guest OS" is idle... which is very anoying
-on machines which only have one host CPU ...
-... is there any interest in hacking-up a better solution (e.g. making
-the code platform-independent for example) ?
-
-Patch was created with:
-  cvs diff -u
-Apply patch to what version:
-  cvs checked out on DATE, release version VER
-Instructions:
-  To patch, go to main bochs directory.
-  Type "patch -p1 < THIS_PATCH_FILE".
-----------------------------------------------------------------------
-
---- original/bochs-1.2.1/cpu/proc_ctrl.cc	Thu May 24 20:46:34 2001
-+++ bochs-1.2.1/cpu/proc_ctrl.cc	Thu Oct  4 12:26:39 2001
-@@ -21,10 +21,29 @@
- //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
- 
- 
--
--
--
--
-+/* GISBURN_IDLE_HACK: a smallish, silly idle hack to prevent bochs
-+ * from consuming 100% CPU time even when it is not required (for
-+ * example, the OS in the emulator calls HLT to wait for an interupt)
-+ * pro:
-+ * - no more 100% CPU usage
-+ * contra:
-+ * - we're sleeping too long
-+ * - bochs still consumes ~10%-20% CPU time while executing an idle 
-+ *   linux kernel
-+ * - this is an hack
-+ * - we really really should move this into X11 display code part
-+ */
-+#define GISBURN_IDLE_HACK 1
-+
-+#ifdef GISBURN_IDLE_HACK
-+extern "C" {
-+#include <X11/Xlib.h>
-+#include <X11/Xutil.h>
-+#include <X11/Xos.h>
-+#include <X11/Xatom.h>
-+#include <X11/keysym.h>
-+}
-+#endif /* GISBURN_IDLE_HACK */
- 
- #define NEED_CPU_REG_SHORTCUTS 1
- #include "bochs.h"
-@@ -51,6 +70,55 @@
- {
- }
- 
-+#ifdef GISBURN_IDLE_HACK
-+/* XPeekEvent() with timeout 
-+ * (adopted from mozilla/gfx/src/xprint/xprintutil_printtofile.c#XNextEventTimeout())
-+ */
-+static
-+Bool XPeekEventTimeout( Display *display, XEvent *event_return, struct timeval *timeout ) 
-+{
-+    int      res;
-+    fd_set   readfds;
-+    int      display_fd = XConnectionNumber(display);
-+
-+    /* small shortcut... */
-+    if( timeout == NULL )
-+    {
-+      XPeekEvent(display, event_return);
-+      return(True);
-+    }
-+    
-+    FD_ZERO(&readfds);
-+    FD_SET(display_fd, &readfds);
-+
-+    /* Note/bug: In the case of internal X events (like used to trigger callbacks 
-+     * registered by XpGetDocumentData()&co.) select() will return with "new info" 
-+     * - but XNextEvent() below processes these _internal_ events silently - and 
-+     * will block if there are no other non-internal events.
-+     * The workaround here is to check with XEventsQueued() if there are non-internal 
-+     * events queued - if not select() will be called again - unfortunately we use 
-+     * the old timeout here instead of the "remaining" time... (this only would hurt 
-+     * if the timeout would be really long - but for current use with values below
-+     * 1/2 secs it does not hurt... =:-)
-+     */
-+    while( XEventsQueued(display, QueuedAfterFlush) == 0 )
-+    {
-+      res = select(display_fd+1, &readfds, NULL, NULL, timeout);
-+    
-+      switch(res)
-+      {
-+        case -1: /* select() error - should not happen */ 
-+            perror("XPeekEventTimeout: select() failure"); 
-+            return(False);
-+        case  0: /* timeout */
-+          return(False);
-+      }
-+    }
-+    
-+    XPeekEvent(display, event_return); 
-+    return(True);
-+}
-+#endif /* GISBURN_IDLE_HACK */  
- 
-   void
- BX_CPU_C::HLT(BxInstruction_t *i)
-@@ -81,6 +149,15 @@
-   // Execution of this instruction completes.  The processor
-   // will remain in a halt state until one of the above conditions
-   // is met.
-+
-+#ifdef GISBURN_IDLE_HACK  
-+  extern Display *bx_x_display;  
-+  XEvent dummy;
-+  struct timeval   timeout;   
-+  timeout.tv_sec  = 0;
-+  timeout.tv_usec = 1000; /* 1/1000 s */  
-+  XPeekEventTimeout(bx_x_display, &dummy, &timeout);
-+#endif /* GISBURN_IDLE_HACK */  
- }
- 
-