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/*
Copyright (C) 2010-2012 Florian Jung
This file is part of flo's FM synth.
flo's FM synth is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
flo's FM synth is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with flo's FM synth. If not, see <http://www.gnu.org/licenses/>.
*/
#include <dlfcn.h>
#include <map>
#include <string>
#include "util.h"
#include "shared_object_manager.h"
using namespace std;
map<void*, int> dl_ref_count;
void* my_dlopen(string file)
{
void* handle;
if (file.find('/')==string::npos)
file="./"+file;
handle=dlopen(file.c_str(),RTLD_NOW);
if (handle==NULL)
throw string("could not open shared object (")+string(dlerror())+string(")");
if (dl_ref_count[handle]!=0) //the library is already opened
{
output_verbose("the requested shared object '"+file+"' is already opened, reusing the handle #"+IntToStr(int(handle)));
dlclose(handle); //we don't need it opened twice
}
else
{
output_verbose("the requested shared object '"+file+"' has been loaded with handle #"+IntToStr(int(handle)));
}
++dl_ref_count[handle];
return handle;
}
void dlref_inc(void* handle)
{
if (handle==NULL)
throw string("dlref_inc: tried to increment the ref-count for NULL");
if (dl_ref_count[handle]==0)
throw string("dlref_inc: tried to increment the ref-count for a nonexistent handle");
++dl_ref_count[handle];
}
void dlref_dec(void* handle)
{
if (handle==NULL)
throw string("dlref_inc: tried to increment the ref-count for NULL");
if (dl_ref_count[handle]==0)
throw string("dlref_inc: tried to decrement the ref-count for a nonexistent handle");
--dl_ref_count[handle];
if (dl_ref_count[handle]==0)
{
output_verbose("noone uses dl-handle "+IntToStr(int(handle))+", unloading the shared object...");
dlclose(handle);
}
}
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