From d0d390d5e771f6f0804355fd47f4b406f865534c Mon Sep 17 00:00:00 2001
From: Kliment Yanev <kliment.yanev@gmail.com>
Date: Sun, 25 Mar 2018 20:08:05 +0200
Subject: [PATCH 1/2] Switch to _sendnext for send_now commands

---
 printrun/printcore.py | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/printrun/printcore.py b/printrun/printcore.py
index e87a5ac34..826e88fb5 100644
--- a/printrun/printcore.py
+++ b/printrun/printcore.py
@@ -389,14 +389,14 @@ def _stop_sender(self):
             self.send_thread = None
 
     def _sender(self):
+        if not self.paused:
+            self.lineno = 0
+            self._send("M110", -1, True)
         while not self.stop_send_thread:
-            try:
-                command = self.priqueue.get(True, 0.1)
-            except QueueEmpty:
-                continue
             while self.printer and self.printing and not self.clear:
                 time.sleep(0.001)
-            self._send(command)
+            if not(self.priqueue.empty()):
+                self._sendnext(now=True)
             while self.printer and self.printing and not self.clear:
                 time.sleep(0.001)
 
@@ -565,16 +565,16 @@ def process_host_command(self, command):
         if command.startswith(";@pause"):
             self.pause()
 
-    def _sendnext(self):
+    def _sendnext(self, now=False):
         if not self.printer:
             return
-        while self.printer and self.printing and not self.clear:
+        while self.printer and (self.printing or now) and not self.clear:
             time.sleep(0.001)
         # Only wait for oks when using serial connections or when not using tcp
         # in streaming mode
         if not self.printer_tcp or not self.tcp_streaming_mode:
             self.clear = False
-        if not (self.printing and self.printer and self.online):
+        if not ((self.printing or now) and self.printer and self.online):
             self.clear = True
             return
         if self.resendfrom < self.lineno and self.resendfrom > -1:
@@ -583,7 +583,8 @@ def _sendnext(self):
             return
         self.resendfrom = -1
         if not self.priqueue.empty():
-            self._send(self.priqueue.get_nowait())
+            self._send(self.priqueue.get_nowait(),self.lineno, True)
+            self.lineno += 1
             self.priqueue.task_done()
             return
         if self.printing and self.queueindex < len(self.mainqueue):
@@ -636,12 +637,13 @@ def _sendnext(self):
                 self.clear = True
             self.queueindex += 1
         else:
-            self.printing = False
-            self.clear = True
-            if not self.paused:
-                self.queueindex = 0
-                self.lineno = 0
-                self._send("M110", -1, True)
+            if not now:
+                self.printing = False
+                self.clear = True
+                if not self.paused:
+                    self.queueindex = 0
+                    self.lineno = 0
+                    self._send("M110", -1, True)
 
     def _send(self, command, lineno = 0, calcchecksum = False):
         # Only add checksums if over serial (tcp does the flow control itself)

From a8fbd40da3f9815c71b2bfd7c20409d855bdee6e Mon Sep 17 00:00:00 2001
From: Kliment Yanev <kliment.yanev@gmail.com>
Date: Sun, 25 Mar 2018 20:16:44 +0200
Subject: [PATCH 2/2] Reduce cpu usage while idling in send

---
 printrun/printcore.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/printrun/printcore.py b/printrun/printcore.py
index 826e88fb5..5b9334703 100644
--- a/printrun/printcore.py
+++ b/printrun/printcore.py
@@ -397,6 +397,8 @@ def _sender(self):
                 time.sleep(0.001)
             if not(self.priqueue.empty()):
                 self._sendnext(now=True)
+            else:
+                time.sleep(0.1)
             while self.printer and self.printing and not self.clear:
                 time.sleep(0.001)