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From: Florian Weimer <fw@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/fw/vfprintf-2] stdio-common: Add lock optimization to vfprintf and vfwprintf
Date: Mon, 12 Dec 2022 15:21:18 +0000 (GMT)	[thread overview]
Message-ID: <20221212152118.1D505385B512@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a407f0532feffbc31a3fa89754dc2313bd56eb89

commit a407f0532feffbc31a3fa89754dc2313bd56eb89
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Aug 18 08:49:54 2022 +0200

    stdio-common: Add lock optimization to vfprintf and vfwprintf
    
    After the rewrite and the implicit unbuffered streams handling, this
    is very straightforward to add.

Diff:
---
 stdio-common/vfprintf-internal.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c
index 83a6aea510..23ada8d0ff 100644
--- a/stdio-common/vfprintf-internal.c
+++ b/stdio-common/vfprintf-internal.c
@@ -1452,6 +1452,14 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
     return EOF;
 #endif
 
+  if (!_IO_need_lock (s))
+    {
+      struct Xprintf (buffer_to_file) wrap;
+      Xprintf (buffer_to_file_init) (&wrap, s);
+      Xprintf_buffer (&wrap.base, format, ap, mode_flags);
+      return Xprintf (buffer_to_file_done) (&wrap);
+    }
+
   int done;
 
   /* Lock stream.  */

                 reply	other threads:[~2022-12-12 15:21 UTC|newest]

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