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I'm trying to create a dynamic array in C to implement a queue, when I compile I get the following error: * glibc detected . / Ex: realloc (): invalid next size: 0x0000000001fbe030 **

My code is as follows:

typedef uint32_t u32;
typedef uint64_t u64;


typedef struct _queue_t *queue_t;

struct _queue_t {
    u32 *array; // Arreglo para guardar elementos de la cola
    u32 FirstElem; // Primer elemento de la cola
    u32 LastElem; // Ultimo elemento de la cola
    u32 memory_allocated; // Para saber si tengo que pedir mas memoria
    u32 Size; // Devuelve la cantidad actual de elementos que tiene la cola
};

queue_t queue_empty() {
    queue_t queue = NULL;
    queue = calloc (1, sizeof (struct _queue_t));

    assert(queue != NULL);

    queue->array = (u32 *) calloc(100, sizeof(u32));
    queue->FirstElem = 0;
    queue->LastElem = 0;
    queue->memory_allocated = 100;
    queue->Size = 0;

    return queue;
}

int main() {

    queue_t queue = NULL;
    queue = queue_empty();

    for (u32 i = 0; i < 1000; i++) {

        if (queue->memory_allocated == queue->Size) {
            queue->array = (u32 *) realloc (queue->array, 100*sizeof(u32));
            queue->memory_allocated += 100;
        }

        queue->LastElem += 1;
        queue->array[queue->LastElem] = i;
        queue->Size += 1;
    }

    return(0);
}

Why this error occurs?

4

1 回答 1

2

您总是在这里分配相同大小的内存：

if (queue->memory_allocated == queue->Size) {
  queue->array = (u32 *) realloc(
      queue->array, 100*sizeof(u32)); // always 100 * sizeof(u32)
  queue->memory_allocated += 100;
}

我认为你想要做的是再分配 100 个元素。您还应该通过引入一个临时存储它来检查 realloc() 的返回值，因为NULL可能会返回，导致丢失指向当前分配的内存的唯一指针：

if (queue->memory_allocated == queue->Size) {
  int new_size = queue->memory_allocated + 100; // increment first
  u32* new_array = (u32 *) realloc(queue->array, new_size * sizeof(u32));
  if (new_array) { // update only if realloc() returns a valid address.
    queue->memory_allocated = new_size;
    queue->array = new_array;
  } else {
    // do something in react
  }
}
于 2013-06-08T03:19:13.303 回答