rwlock.h

#ifndef __RWLOCK_H
#define __RWLOCK_H

#include <pthread.h>

class rwlock {
public:
    rwlock() {
        pthread_rwlock_init(&lock_, nullptr);
    }

    rwlock(const rwlock &) = delete;

    rwlock &operator=(const rwlock &) = delete;

    ~rwlock() {
        pthread_rwlock_destroy(&lock_);
    }

    void lock() {
        wrlock();
    }

    void wrlock() {
        pthread_rwlock_wrlock(&lock_);
    }

    void rdlock() {
        pthread_rwlock_rdlock(&lock_);
    }

    void unlock() {
        pthread_rwlock_unlock(&lock_);
    }

private:
    pthread_rwlock_t lock_;
};

class lock_rd_guard {
public:
    explicit lock_rd_guard(rwlock &lock) : lock(lock) {
        lock.rdlock();
    }

    ~lock_rd_guard() {
        lock.unlock();
    }

private:
    rwlock &lock;
};

#endif