+static void die2(int err, const char *what)
+{
+ fprintf(stderr, "%s failed: %s\n", what, strerror(err));
+ abort();
+}
+
+static void die(const char *what)
+{
+ die2(errno, what);
+}
+
+static void mutex_lock(pthread_mutex_t *mutex)
+{
+ int ret = pthread_mutex_lock(mutex);
+ if (ret) die2(ret, "pthread_mutex_lock");
+}
+
+static void mutex_unlock(pthread_mutex_t *mutex)
+{
+ int ret = pthread_mutex_unlock(mutex);
+ if (ret) die2(ret, "pthread_mutex_unlock");
+}
+
+static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
+ struct timespec *ts)
+{
+ int ret = pthread_cond_timedwait(cond, mutex, ts);
+ if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait");
+ return ret;
+}
+
+static void cond_broadcast(pthread_cond_t *cond)
+{
+ int ret = pthread_cond_broadcast(cond);
+ if (ret) die2(ret, "pthread_cond_broadcast");
+}
+
+static void thread_create(pthread_t *thread, pthread_attr_t *attr,
+ void *(*start_routine)(void*), void *arg)
+{
+ int ret = pthread_create(thread, attr, start_routine, arg);
+ if (ret) die2(ret, "pthread_create");
+}
+