I know pthread_cond_wait() shall be used with mutex, but I’m curious if it can be used with rwlock.
I read manual page of pthread_cond_wait() and it didn’t say anything about using read-write lock, but chatgpt says it’s fine to use pthread_cond_wait() with read-write lock.
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3
pthread_cond_wait() cannot be used directly with a read-write lock (pthread_rwlock_t). It requires a pthread_mutex_t to function correctly. The proper usage is to pair pthread_cond_wait() with a mutex to ensure that the condition variable is correctly synchronized.
If you need to use a read-write lock in your scenario, you would need to manage the synchronization separately, ensuring that the pthread_mutex_t is used for the condition variable operations. Here’s an example of how to properly use pthread_cond_wait() with a mutex:
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
void wait_for_condition() {
pthread_mutex_lock(&mutex);
while (!condition_met) {
pthread_cond_wait(&cond, &mutex);
}
pthread_mutex_unlock(&mutex);
}
void signal_condition() {
pthread_mutex_lock(&mutex);
condition_met = 1;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
}
In this example, the mutex is used for the condition variable operations, and the read-write lock can be used separately for read-write access control.
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