小编Ato*_*r94的帖子

我有一个带有成员变量的基类B（）pthread_mutex_t m。当我尝试锁定派生类中的互斥锁时，我将永远被阻止。我打开GDB并打印出m看起来像乱码（未实例化）的图片，但是我不确定。

基类

class B
{
    protected: //or public!
        pthread_mutex_t m;

    public:
        virtual void lock(); //wrapper for pthread_mutex_lock(&m)
        virtual void unlock(); //wrapper
};

派生类

class D : B
{
    public:
        void foo();

    private:
        pthread_mutex_t derived_m;
};

这是我无限期阻止的代码。

D::foo() {
    //for reference below, gdb prints were taken here.

    pthread_mutex_lock(&m); //blocks forever
    pthread_mutex_lock(&derived_m); //okay
    lock(); //blocks forever
}

用于＆m的GDB print（）

$1 = {__data = {__lock = -8656, __count = 32767, __owner = 4198302, 
    __nusers = 0, __kind = …