C realloc断言

Question

不确定为什么在尝试使用realloc时会出现以下错误：

malloc.c:2401: sysmalloc:断言‘(old_top == initial_top (av) & old_size == 0)连体((未签名) (old_size) >= MINSIZE & prev_inuse (old_top) &((未签名) old_end & (pagesize -1) == 0)“失败。中止(核心倾弃)

下面是代码片段

#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

在您的循环中，您检查nstructs > maxstructs，所以当nstructs==1024和maxstructs==1024时，不需要realloc，而是access myStructs[1024]，这已经过了一步。您需要在测试条件下使用nstructs>=maxstructs。