C realloc断言

Question

不知道为什么我在尝试使用realloc时遇到以下错误：

malloc.c：2401：sysmalloc：断言`（old_top == initial_top（av）&& old_size == 0）|| （（unsigned long）（old_size）> = MINSIZE && prev_inuse（old_top）&&（（unsigned long）old_end＆（pagesize - 1））== 0）'失败。中止（核心倾倒）

这是代码片段

#include <stdio.h>
#include <stdint.h>

typedef struct myStruct {
  char *pt;
  Uint32 tid;
} myStruct;

#define BUCKETSIZE 1024

int main(int argc, char* args[]) 
{
  myStruct *myStructs;
  size_t nstructs = 0, maxstructs = 0;

  maxstructs = BUCKETSIZE;

  myStructs = (myStruct*)malloc(maxstructs * sizeof(myStruct));
  memset(myStructs, 0, BUCKETSIZE * sizeof(myStruct));

  for(nstructs = 0 ; nstructs < 10240 ; nstructs++)
  {
    if (nstructs > maxstructs)
    {
        size_t newsize = (maxstructs + BUCKETSIZE) * sizeof(myStruct);
        myStructs = (myStruct*)realloc(myStructs, newsize);
        memset((uint8_t*)myStructs + maxstructs * sizeof(myStruct), 0, BUCKETSIZE * sizeof(myStruct));
        maxstructs += BUCKETSIZE;
    }

    myStructs[nstructs].pt = args[0];
    myStructs[nstructs].tid = nstructs+1;
  }
  return 0;
}

Answer 1

在你的循环中，你检查nstructs > maxstructs，所以当nstructs==1024和maxstructs==1024，你没有realloc，但访问myStructs[1024]，这是一个结束。在测试条件下你需要nstructs>=maxstructs。