Chyba pri prechode argumenty pthread_create()

Snažím sa vytvoriť Vlákno-Bazén-ako štruktúra pre pthreads cieľom urobiť, rovnaké pracovné miesta pre sieťové programovanie, ktorá je veľmi podobná na túto otázku. Avšak, problém vznikol, ako som sa snažil prejsť argumenty init() metóda pthread_create().

Kód

class ThreadPool{
    public:
        BlockingQueue socket_bq;
        pthread_mutex_t* threads[THREAD_NUM];   // store the pointer of threads

        ThreadPool();
        void init(pthread_attr_t* attr, void*start_routine(void*), void* arg);
};

void ThreadPool::init(pthread_attr_t* attr, void*start_routine(void*), void* arg){
    // create threads
    for(int i = 0; i < THREAD_NUM; i++){
        if(pthread_create(threads[i], attr, start_routine, arg)!=0){
            fprintf(stderr, "Thread Pool Init: falied when creatng threads");
            exit(1);
        }
    }
}

Chybové hlásenie

error: no matching function for call to 'pthread_create'
        if(pthread_create(threads[i], attr, start_routine, arg)!=0){
           ^~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/pthread.h:329:5: note: candidate function not viable: no known conversion from 'pthread_mutex_t *' (aka '_opaque_pthread_mutex_t *') to 'pthread_t  _Nullable * _Nonnull' (aka '_opaque_pthread_t **') for 1st argument
int pthread_create(pthread_t _Nullable * _Nonnull __restrict,
    ^
1 error generated.