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memory_malloc.c
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82 lines (73 loc) · 2.15 KB
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/*
* Copyright (C) 2015-present, Ant Financial Services Group
*
* 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 <jni.h>
#include <stdlib.h>
#include <string.h>
/* Header for class com_alipay_hulu_shared_display_items_MemoryTools */
/*
* Class: com_alipay_hulu_shared_display_items_MemoryTools
* Method: fillMemory
* Signature: (I)I
*/
static int** memory_list = NULL;
static int current_size = 0;
/**
* 声明内存，每块1MB
* @param env
* @param clz
* @param param 多少MB
* @return
*/
jint Java_com_alipay_hulu_shared_display_items_MemoryTools_fillMemory(JNIEnv *env, jclass clz,
jint param) {
int mb_per_int = 1024 / sizeof(int) * 1024;
memory_list = (int **) malloc(param * sizeof(int *));
int i;
for (i = 0; i < param; ++i) {
int* p = (int *) malloc(mb_per_int * sizeof(int));
if (p != NULL) {
memset(p, 2, 1024 * 1024);
memory_list[i] = p;
} else {
// 无法继续申明内存
break;
}
}
current_size = i;
return i;
}
/*
* Class: com_alipay_hulu_shared_display_items_MemoryTools
* Method: releaseMemory
* Signature: ()I
*/
jint Java_com_alipay_hulu_shared_display_items_MemoryTools_releaseMemory(JNIEnv * env, jclass clz) {
if (memory_list == NULL) {
return 0;
}
// 每一块都得free
for (int i = 0; i < current_size; ++i) {
int* p = memory_list[i];
if (p != NULL) {
free(p);
}
memory_list[i] = NULL;
}
free(memory_list);
memory_list = NULL;
current_size = 0;
return 0;
}