代码如下: void*mem_malloc(mem_size_tsize_in){mem_size_tptr,ptr2,size;structmem*mem,*mem2;#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXTu8_tlocal_mem_free_count=0;#endif/* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */LWIP_MEM_ALLOC_DECL_PROTECT();if(size_in==0){returnNULL;}/* Expand...
#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0 当这个宏设置为 1 时，将会允许 lwip 系统在中断...
从1.3.0版本开始,如果将SYS_LIGHTWEIGHT_PROT设置为1,并且将LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT设置为1,那么除了原本的线程环境,pbuf_free()函数还可以从其他线程或中断服务程序(ISR)中调用。这是因为只有在这种设置下,对于PBUF_RAM(使用RAM存储的数据包),内存释放函数(mem_free)也可以在ISR中调用。否则,堆...
* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT=1: we need to free PBUF_RAMpbufs * from ISR context on LPC. */ #ifdefined(FSL_FEATURE_SOC_LPC_ENET_COUNT) && (FSL_FEATURE_SOC_LPC_ENET_COUNT > 0) #ifndefLWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT #defineLWIP_ALLOW_MEM_FREE_FROM_OTHER_C...
If I understood well, ethernet driver is interrupt driven, so some critical lwip functions are called from interrupt context. This must be done with great care, because is not generally safe. Indeed SDK code set LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT and defines sys_arch...
Only since 1.3.0, if SYS_LIGHTWEIGHT_PROT is set to 1 andLWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is set to 1, pbuf_free() may also be called fromanother thread or an ISR (since only then, mem_free - for PBUF_RAM - may be called from anISR: otherwise, the...
LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT set to 1 2011-10-18: Simon Goldschmidt * arch.h, netdb.c: fixed bug #34592: lwip_gethostbyname_r uses nonstandard error value 2011-10-18: Simon Goldschmidt * opt.h: fixed default values of TCP_SNDLOWAT and TCP_SNDQUEUELOWAT for small ...
mem_free(); 前言 想说的: 内存的动态申请&释放最重要的参考是指针; 申请得到的内存返回的是可用空间的其实地址(指针); 释放时也是传入该地址(指针)让内部算法进行释放。 一般这些地址前面部分是内存分配器管理的空间,用于管理本小段内存。 李柱明博客:https://www.cnblogs.com/lizhuming/p/15487079.html ...
Step 2: Go to FREERTOS and enable CMSIS V2 and go to Task & Queues. Change the Stack Size (Words) in defaultTask from 128 to 1024. Step 3: Inside CMSIS V2, go to Advanced settings and set USE_NEWLIB_REENTRANT = Enabled. Leave everything else a...
API:memp_free(memp_t type, void *mem);。参考:((20210803190146-rtjgyhd)) 使用完毕的块插回到对应链表。 4.3 动态内存堆 动态内存堆管理(heap)分为: C 标准库自带的内存管理策略。 lwip 自身实现的内存堆管理策略。 C和 lwip 实现的内存堆管理在 lwip 中只能通过宏MEM_LIBC_MALLOC来进行...