struct malloc_chunk{INTERNAL_SIZE_Tprev_size;/* Size of previous chunk (if free). */INTERNAL_SIZE_Tsize;/* Size in bytes, including overhead. */struct malloc_chunk*fd;/* double links -- used only if free. */str
including overhead. */struct malloc_chunk*fd;/* double links -- used only if free. */struct malloc_chunk*bk;/* Only used for large blocks: pointer to next larger size. */struct malloc_chunk*fd_nextsize;/* double links
*/ 6. struct malloc_chunk* bk; 7. 8. /* Only used for large blocks: pointer to next larger size. */ 9. struct malloc_chunk* fd_nextsize; /* double links -- used only if free. */ 10. struct malloc_chunk* bk_nextsize; 11.}; ...
INTERNAL_SIZE_T size;/* Size in bytes, including overhead. */ structmalloc_chunk*fd;/* double links -- used only if free. */ structmalloc_chunk*bk; /* Only used for large blocks: pointer to next larger size. */ structmalloc_chunk*fd_nextsize;/* double links -- used only if fre...
*/ struct malloc_chunk* bk; /* Only used for large blocks: pointer to next larger size. */ struct malloc_chunk* fd_nextsize; /* double links -- used only if free. */ struct malloc_chunk* bk_nextsize; }; 我们在开发中每次调用 malloc 申请内存的时候,分配器都会给我们分配一个大小合适...
5. struct malloc_chunk* fd; /* double links -- used only if free. */ 6. struct malloc_chunk* bk; 7. 8. /* Only used for large blocks: pointer to next larger size. */ 9. struct malloc_chunk* fd_nextsize; /* double links -- used only if free. */ ...
为了管理malloc的空闲空间,每一个独立块的最前面都包含了一个“头部”信息:一个指向下一个空闲块的指针、一个本身独立块的长度(书上说还有一个指向自身存储空间的指针,但每个存储空间都有自身的指针,为什么还要这个呢。后看英语版原著,这么写的:Each block contains a size, a pointer to nextblock, and the ...
mallocreturns a void pointer to the allocated space, orNULLif there's insufficient memory available. To return a pointer to a type other thanvoid, use a type cast on the return value. The storage space pointed to by the return value is suitably aligned for storage of any type of object ...
puts("Got a valid pointer"); 此时得到的是Got a valid pointer。把0赋给malloc能得到一个合法的指针。 编辑本段函数的工作机制 malloc函数的实质体现在,它有一个将可用的内存块连接为一个长长的列表的所谓空闲链表。调用malloc函数时,它沿连接表寻找一个大到足以满足用户请求所需要的内存块。然后,将该内存块...
malloc() 函数用来动态地分配内存空间，其原型为：void* malloc (size_t size);说明：【参数说明】size 为需要分配的内存空间的大小，以字节（Byte）计。【函数说明】malloc() 在堆区分配一块指定大小的内存空间，用来存放数据。这块内存空间在函数执行完成后不会被初始化，它们的值是未知的。如果希望...