OSMemCreate()中创建链表的疑问

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luoengineer| 中级技术员

楼主 | 2021-11-4 17:50 | 只看该作者回帖奖励

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EMC, os, create, ST, ADDR, DDR

请教下面标红的代码都是局部变量操作的，最后也没有返回。这样操作怎么会建立了一个链表呢？

OS_MEM  *OSMemCreate (void *addr, INT32U nblks, INT32U blksize, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3                         /* Allocate storage for CPU status register    */
OS_CPU_SR  cpu_sr;
#endif
OS_MEM *pmem;
INT8U    *pblk;
void    **plink;
INT32U    i;

......

plink = (void **)addr;                         /* Create linked list of free memory blocks    */
pblk  = (INT8U *)addr + blksize;
for (i = 0; i < (nblks - 1); i++) {
      *plink = (void *)pblk;
      plink  = (void **)pblk;
      pblk = pblk + blksize;
}
*plink             = (void *)0;                /* Last memory block points to NULL             */
pmem->OSMemAddr    = addr;                      /* Store start address of memory partition    */
pmem->OSMemFreeList = addr;                      /* Initialize pointer to pool of free blocks    */
pmem->OSMemNFree = nblks;                   /* Store number of free blocks in MCB          */
pmem->OSMemNBlks = nblks;
pmem->OSMemBlkSize  = blksize;                   /* Store block size of each memory blocks       */
*err             = OS_NO_ERR;
return (pmem);
}

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