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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <cutils/qsort_r_compat.h>
#if HAVE_BSD_QSORT_R
/*
* BSD qsort_r parameter order is as we have defined here.
*/
void qsort_r_compat(void* base, size_t nel, size_t width, void* thunk,
int (*compar)(void*, const void* , const void*)) {
qsort_r(base, nel, width, thunk, compar);
}
#elif HAVE_GNU_QSORT_R
/*
* GNU qsort_r parameter order places the thunk parameter last.
*/
struct compar_data {
void* thunk;
int (*compar)(void*, const void* , const void*);
};
static int compar_wrapper(const void* a, const void* b, void* data) {
struct compar_data* compar_data = (struct compar_data*)data;
return compar_data->compar(compar_data->thunk, a, b);
}
void qsort_r_compat(void* base, size_t nel, size_t width, void* thunk,
int (*compar)(void*, const void* , const void*)) {
struct compar_data compar_data;
compar_data.thunk = thunk;
compar_data.compar = compar;
qsort_r(base, nel, width, compar_wrapper, &compar_data);
}
#else
/*
* Emulate qsort_r using thread local storage to access the thunk data.
*/
#include <cutils/threads.h>
static thread_store_t compar_data_key = THREAD_STORE_INITIALIZER;
struct compar_data {
void* thunk;
int (*compar)(void*, const void* , const void*);
};
static int compar_wrapper(const void* a, const void* b) {
struct compar_data* compar_data = (struct compar_data*)thread_store_get(&compar_data_key);
return compar_data->compar(compar_data->thunk, a, b);
}
void qsort_r_compat(void* base, size_t nel, size_t width, void* thunk,
int (*compar)(void*, const void* , const void*)) {
struct compar_data compar_data;
compar_data.thunk = thunk;
compar_data.compar = compar;
thread_store_set(&compar_data_key, &compar_data, NULL);
qsort(base, nel, width, compar_wrapper);
}
#endif
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