Concept check - using conditional variable and mutex lock on readers-writers problem

[proud radish]

This is my attempt. But I am not so sure if the conditional variable and mutex lock is applied correctly.

#include <pthread.h>

pthread_mutex_t mutex;
pthread_cond_t readers_cv, writers_cv;
int readers_count = 0;

void Reader() {
    pthread_mutex_lock(&mutex);
    readers_count++;
    if (readers_count == 1) {
        pthread_mutex_lock(&writers_cv);
    }
    pthread_mutex_unlock(&mutex);
    
    // Perform reading
    
    pthread_mutex_lock(&mutex);
    readers_count--;
    if (readers_count == 0) {
        pthread_cond_signal(&writers_cv);
    }
    pthread_mutex_unlock(&mutex);
}

void Writer() {
    pthread_mutex_lock(&mutex);
    while (readers_count > 0) {
        pthread_cond_wait(&writers_cv, &mutex);
    }
    
    // Perform writing
    
    pthread_mutex_unlock(&mutex);
}

[whole niche]

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[proud radish]

Call for help. Still open

[whole niche]

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