forked from AuroraMiddleware/gtk
33f4ead506
After doing some performance analysis, it was found that the GTK+ mediaLib code triggers unnecessary lazy loading of dependent libraries. The current code uses RTLD_DEFAULT, RTLD_PROBE, RTLD_NEXT, and RTLD_SELF. However, RTLD_PROBE is all that is necessary, and avoids triggering the lazy loading. So this commit fixes the code to just use RTLD_PROBE. (Bug 580678)
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2001-2007 Sun Microsystems, Inc. All rights reserved.
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* (Brian Cameron, Dmitriy Demin, James Cheng, Padraig O'Briain)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2007. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <dlfcn.h>
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#if defined(HAVE_SYS_SYSTEMINFO_H)
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#include <sys/systeminfo.h>
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#elif defined(HAVE_SYS_SYSINFO_H)
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#include <sys/sysinfo.h>
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#endif
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#include "gdkmedialib.h"
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typedef char * (*ml_version) (void);
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static ml_version medialib_version = mlib_version;
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gboolean
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_gdk_use_medialib (void)
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{
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char *mlib_version_string;
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char sys_info[257];
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long count;
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/*
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* Sun mediaLib(tm) support.
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*
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* http://www.sun.com/processors/vis/mlib.html
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*
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*/
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if (getenv ("GDK_DISABLE_MEDIALIB"))
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return FALSE;
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/*
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* The imaging functions we want to use were added in mediaLib version 2.
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* So turn off mediaLib support if the user has an older version.
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* mlib_version returns a string in this format:
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*
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* mediaLib:0210:20011101:v8plusa
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* ^^^^^^^^ ^^^^ ^^^^^^^^ ^^^^^^^
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* libname vers build ISALIST identifier
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* date (in this case sparcv8plus+vis)
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*
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* The first 2 digits of the version are the major version. The 3rd digit
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* is the minor version, and the 4th digit is the micro version. So the
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* above string corresponds to version 2.1.0.In the following test we only
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* care about the major version.
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*/
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mlib_version_string = medialib_version ();
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count = sysinfo (SI_ARCHITECTURE, &sys_info[0], 257);
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if (count != -1)
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{
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if (strcmp (sys_info, "i386") == 0)
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{
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char *mlib_target_isa = &mlib_version_string[23];
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/*
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* For x86 processors mediaLib generic C implementation
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* does not give any performance advantage so disable it.
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*/
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if (strncmp (mlib_target_isa, "sse", 3) != 0)
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{
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return FALSE;
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}
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/*
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* For x86 processors use of libumem conflicts with
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* mediaLib, so avoid using it.
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*/
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if (dlsym (RTLD_PROBE, "umem_alloc") != NULL)
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{
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return FALSE;
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}
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}
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}
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else
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{
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/* Failed to get system architecture, disable mediaLib */
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return FALSE;
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}
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return TRUE;
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}
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