Package: libasound2
Version: 1.0.21a-1
Severity: normal
Tags: patch
In a call to snd_device_name_hint, snd_dlopen is frequently called with
the parameter name == NULL, meaning to open libasound.so itself. In
this case, snd_dlopen calls dladdr on every call to find out the path to
libasound.so. I am attaching a simple patch to cache this path within
snd_dlopen so that dladdr is called only once; with this patch, the
execution time of snd_device_name_hint (a somewhat slow call) is reduced
by 40%.
Peace,
John Lindgren
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.30-2-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libasound2 depends on:
ii libc6 2.9-25 GNU C Library: Shared libraries
libasound2 recommends no packages.
Versions of packages libasound2 suggests:
ii libasound2-plugins 1.0.21-1 ALSA library additional plugins
-- no debconf information
--- dlmisc.0.c 2009-09-09 08:34:54.000000000 -0400
+++ dlmisc.c 2009-10-24 11:18:51.000000000 -0400
@@ -54,9 +54,13 @@
#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
