From 228f5bfdff29685e72dda8d773e5abaef2fd2b6a Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Tue, 28 Jan 2020 03:58:28 +1100
Subject: [PATCH] [c-host] don't hog CPU resources if queues are full

---
 c-host/src/app.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/c-host/src/app.c b/c-host/src/app.c
index d13cb03f..a9338cd6 100644
--- a/c-host/src/app.c
+++ b/c-host/src/app.c
@@ -117,6 +117,13 @@ static int frameThread(void * opaque)
 
   while(app.running)
   {
+    //wait until there is room in the queue
+    if(lgmpHostQueuePending(app.frameQueue) == LGMP_Q_FRAME_LEN)
+    {
+      usleep(1);
+      continue;
+    }
+
     switch(app.iface->waitFrame(&frame))
     {
       case CAPTURE_RESULT_OK:
@@ -149,13 +156,6 @@ static int frameThread(void * opaque)
       }
     }
 
-    //wait until there is room in the queue
-    if (lgmpHostQueuePending(app.frameQueue) == LGMP_Q_FRAME_LEN)
-    {
-      if (!app.running)
-        break;
-    }
-
     LGMP_STATUS status;
 
     // if we are repeating a frame just send the last frame again
@@ -364,7 +364,10 @@ void capturePostPointerBuffer(CapturePointer pointer)
   while ((status = lgmpHostQueuePost(app.pointerQueue, flags, mem)) != LGMP_OK)
   {
     if (status == LGMP_ERR_QUEUE_FULL)
+    {
+      usleep(1);
       continue;
+    }
 
     DEBUG_ERROR("lgmpHostQueuePost Failed (Pointer): %s", lgmpStatusString(status));
     return;