From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 3 Nov 2009 15:34:34 +0000 (+0100)
Subject: Cache libasound.so access in snd_dlopen
X-Git-Tag: v1.0.22~14
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=0bff86858030d4d19bbc39e50913853f963799af;p=alsa-lib.git

Cache libasound.so access in snd_dlopen

Speed up repeated calls to snd_dlopen by caching the path to
libasound.so; this reduces the instructions executed by
snd_device_name_hint by 40 percent.

Signed-off-by: John Lindgren <john.lindgren@tds.net>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/dlmisc.c b/src/dlmisc.c
index c882cdcf..3cca0f08 100644
--- a/src/dlmisc.c
+++ b/src/dlmisc.c
@@ -54,9 +54,13 @@ void *snd_dlopen(const char *name, int mode)
 #else
 #ifdef HAVE_LIBDL
 	if (name == NULL) {
-		Dl_info dlinfo;
-		if (dladdr(snd_dlopen, &dlinfo) > 0)
-			name = dlinfo.dli_fname;
+		static const char * self = NULL;
+		if (self == NULL) {
+			Dl_info dlinfo;
+			if (dladdr(snd_dlopen, &dlinfo) > 0)
+				self = dlinfo.dli_fname;
+		}
+		name = self;
 	}
 #endif
 #endif