From 6051dec4a1ae6decd9123a3310098baf43f45c49 Mon Sep 17 00:00:00 2001
From: Mihai Moldovan <ïonic@ionic.de>
Date: Fri, 17 Jun 2016 01:45:40 +0000
Subject: 
 {nx-X11/programs/Xserver/hw/nxagent/{{Args,Handlers,Image,Options}.c,Options.h},nxcomp/{Loop,Misc}.cpp}:
 add configurable sleep delay if session is suspended.

---
 nx-X11/programs/Xserver/hw/nxagent/Args.c     | 38 ++++++++++++++++++++++
 nx-X11/programs/Xserver/hw/nxagent/Handlers.c | 46 +++++++++++++++++++--------
 nx-X11/programs/Xserver/hw/nxagent/Image.c    | 14 ++------
 nx-X11/programs/Xserver/hw/nxagent/Options.c  |  2 ++
 nx-X11/programs/Xserver/hw/nxagent/Options.h  |  7 ++++
 5 files changed, 83 insertions(+), 24 deletions(-)

(limited to 'nx-X11/programs/Xserver/hw/nxagent')

diff --git a/nx-X11/programs/Xserver/hw/nxagent/Args.c b/nx-X11/programs/Xserver/hw/nxagent/Args.c
index 59d3deb63..2590dd6c3 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Args.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Args.c
@@ -1339,6 +1339,44 @@ static void nxagentParseOptions(char *name, char *value)
       nxagentChangeOption(Clipboard, ClipboardBoth);
     }
   }
+  else if (!strcmp(name, "sleep"))
+  {
+    long sleep_parse = 0;
+
+    errno = 0;
+    sleep_parse = strtol(value, NULL, 10);
+
+    if ((errno) && (0 == sleep_parse))
+    {
+      fprintf(stderr, "nxagentParseOptions: Unable to convert value [%s] of option [%s]. "
+                      "Ignoring option.\n",
+                      validateString(value), validateString(name));
+
+      return;
+    }
+
+    if ((long) UINT_MAX < sleep_parse)
+    {
+      sleep_parse = UINT_MAX;
+
+      fprintf(stderr, "nxagentParseOptions: Warning: value [%s] of option [%s] "
+                      "out of range, clamped to [%u].\n",
+                      validateString(value), validateString(name), sleep_parse);
+    }
+
+    if (0 > sleep_parse)
+    {
+      sleep_parse = 0;
+
+      fprintf(stderr, "nxagentParseOptions: Warning: value [%s] of option [%s] "
+                      "out of range, clamped to [%u].\n",
+                      validateString(value), validateString(name), sleep_parse);
+    }
+
+    nxagentChangeOption(SleepTime, sleep_parse);
+
+    return;
+  }
   else
   {
     #ifdef DEBUG
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Handlers.c b/nx-X11/programs/Xserver/hw/nxagent/Handlers.c
index 1beff090b..ba4034255 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Handlers.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Handlers.c
@@ -62,14 +62,6 @@
 
 #define FLUSH_AFTER_MULTIPLE_READS
 
-/*
- * Introduce a small delay after each
- * loop if the session is down. The
- * value is in milliseconds.
- */
-
-#define LOOP_DELAY_IF_DOWN       50
-
 /*
  * The soft limit should roughly match
  * the size of the Xlib I/O buffer.
@@ -246,12 +238,21 @@ void nxagentBlockHandler(void * data, struct timeval **timeout, void * mask)
    * not connected to a valid display.
    */
 
-  if (NXDisplayError(nxagentDisplay) == 1 && nxagentShadowCounter == 0)
+  if (NXDisplayError(nxagentDisplay) == 1 && nxagentShadowCounter == 0 && nxagentOption(SleepTime) > 0)
   {
-    usleep(LOOP_DELAY_IF_DOWN * 1000);
+#ifdef TEST
+    fprintf(stderr, "nxagentBlockHandler: sleeping for %d milliseconds for slowdown.\n",
+                    nxagentOption(SleepTime));
+#endif
+    usleep(nxagentOption(SleepTime) * 1000);
 
     now = GetTimeInMillis();
   }
+#ifdef TEST
+  else if (0 == nxagentOption(SleepTime)) {
+    fprintf(stderr, "nxagentBlockHandler: not sleeping for slowdown.\n");
+  }
+#endif
 
   /*
    * Update the shadow display. This is
@@ -743,9 +744,17 @@ void nxagentShadowBlockHandler(void * data, struct timeval **timeout, void * mas
     nxagentHandleConnectionChanges();
   }
 
-  if (nxagentSessionState == SESSION_DOWN)
+  if (nxagentSessionState == SESSION_DOWN && nxagentOption(SleepTime) > 0)
   {
-    usleep(50 * 1000);
+#ifdef TEST
+    fprintf(stderr, "nxagentBlockHandler: sleeping for %d milliseconds for slowdown.\n",
+                    nxagentOption(SleepTime));
+#endif
+    usleep(nxagentOption(SleepTime) * 1000);
+  }
+#ifdef TEST
+  else if (0 == nxagentOption(SleepTime)) {
+    fprintf(stderr, "nxagentBlockHandler: not sleeping for slowdown.\n");
   }
 
   #ifndef __CYGWIN32__
@@ -826,7 +835,18 @@ FIXME: Must queue multiple writes and handle
 
   #ifdef __CYGWIN32__
 
-  usleep(50 * 1000);
+  if (nxagentOption(SleepTime) > 0) {
+#ifdef TEST
+    fprintf(stderr, "nxagentShadowBlockHandler: sleeping for %d milliseconds for slowdown.\n",
+                    nxagentOption(SleepTime));
+#endif
+    usleep(nxagentOption(SleepTime) * 1000);
+  }
+#ifdef TEST
+  else if (0 == nxagentOption(SleepTime)) {
+    fprintf(stderr, "nxagentShadowBlockHandler: not sleeping for slowdown.\n");
+  }
+#endif
 
   (*timeout) -> tv_sec  = 0;
   (*timeout) -> tv_usec = 50 * 1000;
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Image.c b/nx-X11/programs/Xserver/hw/nxagent/Image.c
index 6a7d46c35..a158a11db 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Image.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Image.c
@@ -68,15 +68,6 @@
 
 #define IMAGE_UNIQUE_RATIO   10
 
-/*
- * Introduce a small delay after each image
- * operation if the session is down. Value
- * is in microseconds and is multiplied by
- * the image data size in kilobytes.
- */
-
-#define IMAGE_DELAY_IF_DOWN  250
-
 /*
  * Preferred pack and split parameters we
  * got from the NX transport.
@@ -521,11 +512,12 @@ void nxagentPutImage(DrawablePtr pDrawable, GCPtr pGC, int depth,
   length = nxagentImageLength(dstWidth, dstHeight, format, leftPad, depth);
 
   if (nxagentShadowCounter == 0 &&
-          NXDisplayError(nxagentDisplay) == 1)
+          NXDisplayError(nxagentDisplay) == 1 &&
+              nxagentOption(SleepTime) > 0)
   {
     int us;
 
-    us = IMAGE_DELAY_IF_DOWN * (length / 1024);
+    us = nxagentOption(SleepTime) * 4 * (length / 1024);
 
     us = (us < 10000 ? 10000 : (us > 1000000 ? 1000000 : us));
 
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Options.c b/nx-X11/programs/Xserver/hw/nxagent/Options.c
index dbe200273..8a3275c64 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Options.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Options.c
@@ -156,6 +156,8 @@ void nxagentInitOptions()
   nxagentOptions.ImageRateLimit = 0;
 
   nxagentOptions.Xinerama = 0;
+
+  nxagentOptions.SleepTime = DEFAULT_SLEEP_TIME;
 }
 
 /*
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Options.h b/nx-X11/programs/Xserver/hw/nxagent/Options.h
index 5bf1597d5..02b886242 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Options.h
+++ b/nx-X11/programs/Xserver/hw/nxagent/Options.h
@@ -28,6 +28,7 @@
 
 #define UNDEFINED -1
 #define COPY_UNLIMITED -1
+#define DEFAULT_SLEEP_TIME 50
 
 extern unsigned int nxagentPrintGeometryFlags;
 
@@ -399,6 +400,12 @@ typedef struct _AgentOptions
 
   int Xinerama;
 
+  /*
+   * Sleep delay in microseconds.
+   */
+
+  unsigned int SleepTime;
+
 } AgentOptionsRec;
 
 typedef AgentOptionsRec *AgentOptionsPtr;
-- 
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