The idea's basically the same, though it's of course uglier using libpthread in C. You have to have both a flag to keep track of readiness, and a condition variable to queue up waiting threads. Here's a rough sketch:

#include <pthread.h>
pthread_mutex_t lock;
pthread_cond_t cond;
int ready;

void
consumer() {
    pthread_mutex_lock(&lock);
    while (!ready)
        pthread_cond_wait(&cond, &lock);
    /* lock is locked, ready is true */
    ready = 0;
    pthread_mutex_unlock(&lock);
}

void
producer() {
    /* lock is unlocked */
    pthread_mutex_lock(&lock);
    ready = 1;
    pthread_cond_signal(&cond, &lock);
    /* lock is still locked */
    pthread_mutex_unlock(&lock);
}
[download]

libpthread is POSIX, so it should be available anywhere.

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