+/*
+ * Log exports
+ */
+extern int read_iolog_get(struct thread_data *, struct io_u *);
+extern void write_iolog_put(struct thread_data *, struct io_u *);
+extern int init_iolog(struct thread_data *td);
+extern void log_io_piece(struct thread_data *, struct io_u *);
+extern void prune_io_piece_log(struct thread_data *);
+extern void write_iolog_close(struct thread_data *);
+
+/*
+ * Logging
+ */
+extern void add_clat_sample(struct thread_data *, int, unsigned long);
+extern void add_slat_sample(struct thread_data *, int, unsigned long);
+extern void add_bw_sample(struct thread_data *, int);
+extern void show_run_stats(void);
+extern void init_disk_util(struct thread_data *);
+extern void update_rusage_stat(struct thread_data *);
+extern void update_io_ticks(void);
+extern void disk_util_timer_arm(void);
+extern void setup_log(struct io_log **);
+extern void finish_log(struct thread_data *, struct io_log *, const char *);
+extern int setup_rate(struct thread_data *);
+
+/*
+ * Time functions
+ */
+extern unsigned long utime_since(struct timeval *, struct timeval *);
+extern unsigned long mtime_since(struct timeval *, struct timeval *);
+extern unsigned long mtime_since_now(struct timeval *);
+extern unsigned long time_since_now(struct timeval *);
+extern void usec_sleep(struct thread_data *, unsigned long);
+extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);
+
+/*
+ * Init functions
+ */
+extern int parse_options(int, char **);
+extern int init_random_state(struct thread_data *);
+
+/*
+ * This is a pretty crappy semaphore implementation, but with the use that fio
+ * has (just signalling start/go conditions), it doesn't have to be better.
+ * Naturally this would not work for any type of contended semaphore or
+ * for real locking.
+ */
+static inline void fio_sem_init(volatile int volatile *sem, int val)
+{
+ *sem = val;
+}
+
+static inline void fio_sem_down(volatile int volatile *sem)
+{
+ while (*sem == 0)
+ usleep(10000);
+
+ (*sem)--;
+}
+
+static inline void fio_sem_up(volatile int volatile *sem)
+{
+ (*sem)++;
+}
+