这是我到目前为止所做的:
class mutexLocker
{
private:
/* Declaration of a Mutex variable `mutexA`. */
pthread_mutex_t &mutexA;
/* `mutexStatus` holds the return value of the function`pthread_mutex_lock `.
This value has to be returned to the callee so we need to preserve it in a class
variable. */
int mutexStatus;
/* We need to decide how to deal with the situation when one thread tries to lock then
mutex repeatedly. If the mutex is of type recursive, then there won't be any problem for
sure, but otherwise the case may result in a deadlock. */
pthread_t calleeThreadId;
public:
/* Constructor attempts to lock the desired mutex variable. */
mutexLocker (pthread_mutex_t argMutexVariable, pthread_t threadId)
: mutexA (argMutexVariable, calleeThreadId)
{
/* Return value is needed in order to know whether the mutex has been
successfully locked or not. */
int mutexStatus = pthread_mutex_lock (&argMutexVariable);
}
/* Since the constructor can't return anything, we need to have a separate function
which returns the status of the lock. */
int getMutexLockStatus ()
{
return mutexStatus;
}
/* The destructor will get called automatically whereever the callee's scope ends, and
will get the mutex unlocked. */
~mutexLocker ()
{
pthread_mutex_unlock (&mutexA);
}
};
在 DIY 互斥锁储物柜类中还应该提供哪些其他功能?