/*
 * C (multithreaded) using POSIX Thread Library (pthread)
 * by Stefan Scheler <sts[at]synflood[dot]de>
 * Ilmenau, Germany - May 2005
 *
 * compile with: gcc -pthread -o 99bottles 99bottles.c
 * disable debug output with: ./99bottles 2>/dev/null
 *
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h> 
 
#define THREADS 10
#define PLURALS (bottles>1) ? "s" : ""

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int bottles = 99;
 
void *takeonedownandpassitaround(void *ptr) {

    struct timespec sleeptime;
    int *thread_id = (int *)ptr;
    
    while (1) {
        pthread_mutex_lock(&mutex);
        if (bottles>0) {
            fprintf(stderr, "Thread %d: ", *thread_id);
            printf("%d bottle%s of beer on the wall, %d bottle%s of beer.\n", bottles, PLURALS, \