[Emacs-diffs] emacs-25 39b166f: Disable DebPrint in sys_read on MS-Windows

[Eli Zaretskii]

branch: emacs-25
commit 39b166fc43a37d1731a194c06deacba571894847
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Disable DebPrint in sys_read on MS-Windows
    
    * src/w32.c (sys_read): Disable a debugging print that is normal
    when non-blocking reads are retried.
---
 src/w32.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/src/w32.c b/src/w32.c
index 067bb3d..fbcfb97 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -8369,7 +8369,17 @@ sys_read (int fd, char * buffer, unsigned int count)
 
            case STATUS_READ_READY:
            case STATUS_READ_IN_PROGRESS:
-             DebPrint (("sys_read called when read is in progress\n"));
+#if 0
+             /* This happens all the time during GnuTLS handshake
+                with the remote, evidently because GnuTLS waits for
+                the read to complete by retrying the read operation
+                upon EAGAIN.  So I'm disabling the DebPrint to avoid
+                wasting cycles on something that is not a real
+                problem.  Enable if you need to debug something that
+                bumps into this.  */
+             DebPrint (("sys_read called when read is in progress %d\n",
+                        current_status));
+#endif
              errno = EWOULDBLOCK;
              return -1;