Question

我最近开始学习C并正在编写一些应用程序，我收到了这个我以前从未见过的错误，而且当我进行mallocing时显然正在得到

malloc.c:2394: Assertion (old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0) failed. Aborted (core dumped)

以下是代码段

typedef struct {
    Node *root;
    pthread_id id;
    pid_t tid;
}Thread;

typedef struct {
    Thread **thread;
    int cap, len;
}arr;

static __thread Thread *self = NULL;
pthread_mutex_t lock;
static arr p;

static void 
foo (void)
{
    pthread_mutex_lock(&lock);
    Thread **newthread;
    if (p.len == p.cap){
        if (p.cap != 0){
            newthread = (Thread **) realloc(p.thread, (1+p.cap)*sizeof(Thread *));
        }
        else {
            newthread = (Thread **)malloc(sizeof(Thread *));
        }
        if (!newthread){
            printf("appendThreadpointer: Error while allocating size\n");
            exit(1);
        }
        p.thread=newthread;
        ++p.cap;
    }

    ++p.len;
    Thread *t = malloc(sizeof(Thread *));
    t->tid = syscall(SYS_gettid);
    t->root = newNode();
    t->id = pthread_self();
    p.thread[p.len-1] = t;
    self = t;
    pthread_mutex_unlock(&lock);
}

任何人都可以看到为什么会发生这种情况的原因吗？最奇怪的是，如果我从tid结构中删除Thread字段，那么它工作正常，只有在我包含tid字段时才会出现此错误。

很困惑，对此有任何帮助将不胜感激，谢谢。

Answer 1

Thread *t = malloc(sizeof(Thread *));

可能应该改为

Thread *t = malloc(sizeof(Thread));

C：Malloc Assertion失败

1 个答案: