HI,

The MHD goes in a busy loop when it is configured with MHD_USE_POLL_INTERNALLY and a connection times out.
When the connection times out, the connection is closed at connection.c:2646, which sets connection->event_loop_info = MHD_EVENT_LOOP_INFO_CLEANUP.
When the loop info is set to MHD_EVENT_LOOP_INFO_CLEANUP, the main function of the thread loop, MHD_poll_all, never calls back the connection idle callback, which would have cleaned the connection and exit the loop.
I resolved the issue in my development code by adding pos->idle_handler (pos) at daemon.c:2477 in MHD_poll_all (SVN 35533).

The busy loop could be tested using a small enough connection timeout and netcat:
nc -v -w 100 <IP ADDRESS> <IP PORT>

CPU usage will reach 100% in one of the CPU and will remain at that level even when the netcat has closed its end of the connection.

Thanks,

Louis Benoit 

1 files changed, 1 insertions, 1 deletions

diff --git a/src/include/microhttpd.h b/src/include/microhttpd.h
index 93c4c212..69fdd1d9 100644
--- a/src/include/microhttpd.h
+++ b/src/include/microhttpd.h
@@ -130,7 +130,7 @@ typedef intptr_t ssize_t;
  * Current version of the library.
  * 0x01093001 = 1.9.30-1.
  */
-#define MHD_VERSION 0x00094004
+#define MHD_VERSION 0x00094005
 
 /**
  * MHD-internal return code for "YES".