dynmem_sample.c

/* * Copyright (c) 2006-2018, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2018-08-24 yangjie the first version *//* * 程序清单：动态内存管理例程 * * 这个程序会创建一个动态的线程，这个线程会动态申请内存并释放 * 每次申请更大的内存，当申请不到的时候就结束 */#include <rtthread.h>#define THREAD_PRIORITY 25#define THREAD_STACK_SIZE 512#define THREAD_TIMESLICE 5/* 线程入口 */void thread1_entry(void *parameter){ int i; char *ptr = RT_NULL; /* 内存块的指针 */ for (i = 0; ; i++) { /* 每次分配 (1 << i) 大小字节数的内存空间 */ ptr = rt_malloc(1 << i); /* 如果分配成功 */ if (ptr != RT_NULL) { rt_kprintf("get memory :%d byte\n", (1 << i)); /* 释放内存块 */ rt_free(ptr); rt_kprintf("free memory :%d byte\n", (1 << i)); ptr = RT_NULL; } else { rt_kprintf("try to get %d byte memory failed!\n", (1 << i)); return; } }}int dynmem_sample(void){ rt_thread_t tid = RT_NULL; /* 创建线程1 */ tid = rt_thread_create("thread1", thread1_entry, RT_NULL, THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE); if (tid != RT_NULL) rt_thread_startup(tid); return 0;}/* 导出到 msh 命令列表中 */MSH_CMD_EXPORT(dynmem_sample, dynmem sample);