Certainly! Here is an implementation of a conditional variable in C using semaphores and mutexes:

```
#include <pthread.h>
#include <semaphore.h>

/* Struct for conditional variable */
typedef struct {
   sem_t sem;
   pthread_mutex_t mutex;
   int value;
} cond_var_t;

/* Initialize the conditional variable */
void cond_var_init(cond_var_t* cv) {
   sem_init(&cv->sem, 0, 0);
   pthread_mutex_init(&cv->mutex, NULL);
   cv->value = 0;
}

/* Wait on the conditional variable */
void cond_var_wait(cond_var_t* cv, pthread_mutex_t* mutex) {
   pthread_mutex_lock(&cv->mutex);
   cv->value++;
   pthread_mutex_unlock(mutex);
   sem_wait(&cv->sem);
   sem_post(&cv->sem);
}

/* Signal the conditional variable */
void cond_var_signal(cond_var_t* cv) {
   pthread_mutex_lock(&cv->mutex);
   if (cv->value > 0) {
      cv->value--;
      sem_post(&cv->sem);
   }
   pthread_mutex_unlock(&cv->mutex);
}

/* Destroy the conditional variable */
void cond_var_destroy(cond_var_t* cv) {
   sem_destroy(&cv->sem);
   pthread_mutex_destroy(&cv->mutex);
}
```

In this implementation, the conditional variable is represented by the `cond_var_t` struct, which contains a semaphore (`sem_t`), a mutex (`pthread_mutex_t`), and an integer value. The `semaphore` is initialized to 0, and the `mutex` is initialized to `NULL`.

The `cond_var_wait` function locks the `mutex`, increments the `value`, unlocks the `mutex`, waits on the `semaphore`, and then posts to the `semaphore`.

The `cond_var_signal` function locks the `mutex`, checks if the `value` is greater than 0, decrements the `value`, and then posts to the `semaphore`. If the `value` is 0, then the function simply unlocks the `mutex`.

The `cond_var_init` function initializes the `semaphore`, `mutex`, and `value`.

The `cond_var_destroy` function destroys the `semaphore` and `mutex`.

I hope this implementation helps you understand how to use semaphores and mutexes to implement a conditional variable in C. If you have any further questions or concerns, please let me know.
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