[fio.git] / fio.h

#ifndef FIO_H
#define FIO_H

#include <sched.h>
#include <limits.h>
#include <pthread.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include "list.h"
#include "md5.h"
#include "crc32.h"
#include "arch.h"
#include "os.h"

struct io_stat {
	unsigned long val;
	unsigned long val_sq;
	unsigned long max_val;
	unsigned long min_val;
	unsigned long samples;
};

struct io_sample {
	unsigned long time;
	unsigned long val;
	unsigned int ddir;
};

struct io_log {
	unsigned long nr_samples;
	unsigned long max_samples;
	struct io_sample *log;
};

struct io_piece {
	struct list_head list;
	unsigned long long offset;
	unsigned int len;
	int ddir;
};

/*
 * The io unit
 */
struct io_u {
	union {
#ifdef FIO_HAVE_LIBAIO
		struct iocb iocb;
#endif
#ifdef FIO_HAVE_POSIXAIO
		struct aiocb aiocb;
#endif
#ifdef FIO_HAVE_SGIO
		struct sg_io_hdr hdr;
#endif
	};
	struct timeval start_time;
	struct timeval issue_time;

	char *buf;
	unsigned int buflen;
	unsigned long long offset;
	unsigned int index;

	unsigned int resid;
	unsigned int error;

	unsigned char seen;
	unsigned char ddir;

	struct list_head list;
};

#define FIO_HDR_MAGIC	0xf00baaef

enum {
	VERIFY_NONE = 0,
	VERIFY_MD5,
	VERIFY_CRC32,
};

struct verify_header {
	unsigned int fio_magic;
	unsigned int len;
	unsigned int verify_type;
	union {
		char md5_digest[MD5_HASH_WORDS * 4];
		unsigned long crc32;
	};
};

struct group_run_stats {
	unsigned long long max_run[2], min_run[2];
	unsigned long long max_bw[2], min_bw[2];
	unsigned long long io_kb[2];
	unsigned long long agg[2];
};

enum fio_ddir {
	DDIR_READ = 0,
	DDIR_WRITE,
};

/*
 * What type of allocation to use for io buffers
 */
enum fio_memtype {
	MEM_MALLOC = 0,	/* ordinary malloc */
	MEM_SHM,	/* use shared memory segments */
	MEM_MMAP,	/* use anonynomous mmap */
};

/*
 * The type of object we are working on
 */
enum fio_filetype {
	FIO_TYPE_FILE = 1,
	FIO_TYPE_BD,
	FIO_TYPE_CHAR,
};

enum fio_ioengine_flags {
	FIO_SYNCIO	= 1 << 0,
	FIO_CPUIO	= 1 << 1,
	FIO_MMAPIO	= 1 << 2,
};

/*
 * This describes a single thread/process executing a fio job.
 */
struct thread_data {
	char name[32];
	char *file_name;
	char *directory;
	char verror[80];
	pthread_t thread;
	int thread_number;
	int groupid;
	enum fio_filetype filetype;
	int error;
	int fd;
	void *mmap;
	pid_t pid;
	char *orig_buffer;
	size_t orig_buffer_size;
	volatile int terminate;
	volatile int runstate;
	enum fio_ddir ddir;
	unsigned int iomix;
	unsigned int ioprio;

	unsigned char sequential;
	unsigned char odirect;
	unsigned char create_file;
	unsigned char invalidate_cache;
	unsigned char create_serialize;
	unsigned char create_fsync;
	unsigned char end_fsync;
	unsigned char sync_io;
	unsigned char verify;
	unsigned char use_thread;
	unsigned char do_disk_util;
	unsigned char override_sync;
	unsigned char rand_repeatable;

	unsigned int bs;
	unsigned int min_bs;
	unsigned int max_bs;
	unsigned int thinktime;
	unsigned int fsync_blocks;
	unsigned int start_delay;
	unsigned long timeout;
	unsigned int overwrite;
	unsigned int bw_avg_time;
	unsigned int loops;
	unsigned long long file_size;
	unsigned long long real_file_size;
	unsigned long long file_offset;
	unsigned long long zone_size;
	unsigned long long zone_skip;
	enum fio_memtype mem_type;
	unsigned int stonewall;
	unsigned int numjobs;
	unsigned int iodepth;
	os_cpu_mask_t cpumask;
	unsigned int iolog;
	unsigned int read_iolog;
	unsigned int write_iolog;
	unsigned int rwmixcycle;
	unsigned int rwmixread;
	unsigned int nice;

	char *iolog_file;
	void *iolog_buf;
	FILE *iolog_f;

	char *sysfs_root;
	char *ioscheduler;

	os_random_state_t bsrange_state;
	os_random_state_t verify_state;

	int shm_id;

	/*
	 * IO engine hooks, contains everything needed to submit an io_u
	 * to any of the available IO engines.
	 */
	struct ioengine_ops *io_ops;

	/*
	 * Current IO depth and list of free and busy io_u's.
	 */
	unsigned int cur_depth;
	struct list_head io_u_freelist;
	struct list_head io_u_busylist;

	/*
	 * Rate state
	 */
	unsigned int rate;
	unsigned int ratemin;
	unsigned int ratecycle;
	unsigned long rate_usec_cycle;
	long rate_pending_usleep;
	unsigned long rate_bytes;
	struct timeval lastrate;

	unsigned long runtime[2];		/* msec */
	unsigned long long io_size;
	unsigned long long total_io_size;

	unsigned long long io_blocks[2];
	unsigned long long io_bytes[2];
	unsigned long long zone_bytes;
	unsigned long long this_io_bytes[2];
	unsigned long long last_pos;
	volatile int mutex;

	/*
	 * State for random io, a bitmap of blocks done vs not done
	 */
	os_random_state_t random_state;
	unsigned long *file_map;
	unsigned int num_maps;

	/*
	 * CPU "io" cycle burner
	 */
	unsigned int cpuload;
	unsigned int cpucycle;

	/*
	 * bandwidth and latency stats
	 */
	struct io_stat clat_stat[2];		/* completion latency */
	struct io_stat slat_stat[2];		/* submission latency */
	struct io_stat bw_stat[2];		/* bandwidth stats */

	unsigned long long stat_io_bytes[2];
	struct timeval stat_sample_time[2];

	struct io_log *slat_log;
	struct io_log *clat_log;
	struct io_log *bw_log;

	struct timeval start;	/* start of this loop */
	struct timeval epoch;	/* time job was started */

	/*
	 * fio system usage accounting
	 */
	struct rusage ru_start;
	struct rusage ru_end;
	unsigned long usr_time;
	unsigned long sys_time;
	unsigned long ctx;

	/*
	 * read/write mixed workload state
	 */
	os_random_state_t rwmix_state;
	struct timeval rwmix_switch;
	enum fio_ddir rwmix_ddir;

	/*
	 * Pre-run and post-run shell
	 */
	char *exec_prerun;
	char *exec_postrun;

	/*
	 * IO historic logs
	 */
	struct list_head io_hist_list;
	struct list_head io_log_list;
};

#define __td_verror(td, err, msg)					\
	do {								\
		int e = (err);						\
		(td)->error = e;					\
		snprintf(td->verror, sizeof(td->verror) - 1, "file:%s:%d, error=%s", __FILE__, __LINE__, (msg));	\
	} while (0)


#define td_verror(td, err)	__td_verror((td), (err), strerror((err)))
#define td_vmsg(td, err, msg)	__td_verror((td), (err), (msg))

extern struct io_u *__get_io_u(struct thread_data *);
extern void put_io_u(struct thread_data *, struct io_u *);

extern int rate_quit;
extern int write_lat_log;
extern int write_bw_log;
extern int exitall_on_terminate;
extern int thread_number;
extern int shm_id;
extern int groupid;
extern int terse_output;
extern FILE *f_out;
extern FILE *f_err;
extern char *fio_inst_prefix;

extern struct thread_data *threads;

#define td_read(td)		((td)->ddir == DDIR_READ)
#define td_write(td)		((td)->ddir == DDIR_WRITE)
#define td_rw(td)		((td)->iomix != 0)

#define BLOCKS_PER_MAP		(8 * sizeof(long))
#define TO_MAP_BLOCK(td, b)	((b) - ((td)->file_offset / (td)->min_bs))
#define RAND_MAP_IDX(td, b)	(TO_MAP_BLOCK(td, b) / BLOCKS_PER_MAP)
#define RAND_MAP_BIT(td, b)	(TO_MAP_BLOCK(td, b) & (BLOCKS_PER_MAP - 1))

#define MAX_JOBS	(1024)

struct disk_util_stat {
	unsigned ios[2];
	unsigned merges[2];
	unsigned long long sectors[2];
	unsigned ticks[2];
	unsigned io_ticks;
	unsigned time_in_queue;
};

struct disk_util {
	struct list_head list;

	char *name;
	char path[256];
	dev_t dev;

	struct disk_util_stat dus;
	struct disk_util_stat last_dus;

	unsigned long msec;
	struct timeval time;
};

struct io_completion_data {
	int nr;				/* input */

	int error;			/* output */
	unsigned long bytes_done[2];	/* output */
};

#define DISK_UTIL_MSEC	(250)

#ifndef min
#define min(a, b)	((a) < (b) ? (a) : (b))
#endif

/*
 * 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(unsigned int);
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 *sem, int val)
{
	*sem = val;
}

static inline void fio_sem_down(volatile int *sem)
{
	while (*sem == 0)
		usleep(10000);

	(*sem)--;
}

static inline void fio_sem_up(volatile int *sem)
{
	(*sem)++;
}

/*
 * If logging output to a file, stderr should go to both stderr and f_err
 */
#define log_err(args...)	do {		\
	fprintf(f_err, ##args);			\
	if (f_err != stderr)			\
		fprintf(stderr, ##args);	\
	} while (0)

struct ioengine_ops {
	char name[16];
	int version;
	int flags;
	int (*setup)(struct thread_data *);
	int (*init)(struct thread_data *);
	int (*prep)(struct thread_data *, struct io_u *);
	int (*queue)(struct thread_data *, struct io_u *);
	int (*getevents)(struct thread_data *, int, int, struct timespec *);
	struct io_u *(*event)(struct thread_data *, int);
	int (*cancel)(struct thread_data *, struct io_u *);
	void (*cleanup)(struct thread_data *);
	int (*sync)(struct thread_data *);
	void *data;
	void *dlhandle;
};

#define FIO_IOOPS_VERSION	1

extern struct ioengine_ops *load_ioengine(struct thread_data *, char *);
extern void close_ioengine(struct thread_data *);

/*
 * Mark unused variables passed to ops functions as unused, to silence gcc
 */
#define fio_unused	__attribute((__unused__))

#endif
Commit	Line	Data
	1	#ifndef FIO_H
	2	#define FIO_H
	3
	4	#include <sched.h>
	5	#include <limits.h>
	6	#include <pthread.h>
	7	#include <sys/time.h>
	8	#include <sys/resource.h>
	9	#include <errno.h>
	10	#include <stdlib.h>
	11	#include <stdio.h>
	12	#include <unistd.h>
	13
	14	#include "list.h"
	15	#include "md5.h"
	16	#include "crc32.h"
	17	#include "arch.h"
	18	#include "os.h"
	19
	20	struct io_stat {
	21	unsigned long val;
	22	unsigned long val_sq;
	23	unsigned long max_val;
	24	unsigned long min_val;
	25	unsigned long samples;
	26	};
	27
	28	struct io_sample {
	29	unsigned long time;
	30	unsigned long val;
	31	unsigned int ddir;
	32	};
	33
	34	struct io_log {
	35	unsigned long nr_samples;
	36	unsigned long max_samples;
	37	struct io_sample *log;
	38	};
	39
	40	struct io_piece {
	41	struct list_head list;
	42	unsigned long long offset;
	43	unsigned int len;
	44	int ddir;
	45	};
	46
	47	/*
	48	* The io unit
	49	*/
	50	struct io_u {
	51	union {
	52	#ifdef FIO_HAVE_LIBAIO
	53	struct iocb iocb;
	54	#endif
	55	#ifdef FIO_HAVE_POSIXAIO
	56	struct aiocb aiocb;
	57	#endif
	58	#ifdef FIO_HAVE_SGIO
	59	struct sg_io_hdr hdr;
	60	#endif
	61	};
	62	struct timeval start_time;
	63	struct timeval issue_time;
	64
	65	char *buf;
	66	unsigned int buflen;
	67	unsigned long long offset;
	68	unsigned int index;
	69
	70	unsigned int resid;
	71	unsigned int error;
	72
	73	unsigned char seen;
	74	unsigned char ddir;
	75
	76	struct list_head list;
	77	};
	78
	79	#define FIO_HDR_MAGIC 0xf00baaef
	80
	81	enum {
	82	VERIFY_NONE = 0,
	83	VERIFY_MD5,
	84	VERIFY_CRC32,
	85	};
	86
	87	struct verify_header {
	88	unsigned int fio_magic;
	89	unsigned int len;
	90	unsigned int verify_type;
	91	union {
	92	char md5_digest[MD5_HASH_WORDS * 4];
	93	unsigned long crc32;
	94	};
	95	};
	96
	97	struct group_run_stats {
	98	unsigned long long max_run[2], min_run[2];
	99	unsigned long long max_bw[2], min_bw[2];
	100	unsigned long long io_kb[2];
	101	unsigned long long agg[2];
	102	};
	103
	104	enum fio_ddir {
	105	DDIR_READ = 0,
	106	DDIR_WRITE,
	107	};
	108
	109	/*
	110	* What type of allocation to use for io buffers
	111	*/
	112	enum fio_memtype {
	113	MEM_MALLOC = 0, /* ordinary malloc */
	114	MEM_SHM, /* use shared memory segments */
	115	MEM_MMAP, /* use anonynomous mmap */
	116	};
	117
	118	/*
	119	* The type of object we are working on
	120	*/
	121	enum fio_filetype {
	122	FIO_TYPE_FILE = 1,
	123	FIO_TYPE_BD,
	124	FIO_TYPE_CHAR,
	125	};
	126
	127	enum fio_ioengine_flags {
	128	FIO_SYNCIO = 1 << 0,
	129	FIO_CPUIO = 1 << 1,
	130	FIO_MMAPIO = 1 << 2,
	131	};
	132
	133	/*
	134	* This describes a single thread/process executing a fio job.
	135	*/
	136	struct thread_data {
	137	char name[32];
	138	char *file_name;
	139	char *directory;
	140	char verror[80];
	141	pthread_t thread;
	142	int thread_number;
	143	int groupid;
	144	enum fio_filetype filetype;
	145	int error;
	146	int fd;
	147	void *mmap;
	148	pid_t pid;
	149	char *orig_buffer;
	150	size_t orig_buffer_size;
	151	volatile int terminate;
	152	volatile int runstate;
	153	enum fio_ddir ddir;
	154	unsigned int iomix;
	155	unsigned int ioprio;
	156
	157	unsigned char sequential;
	158	unsigned char odirect;
	159	unsigned char create_file;
	160	unsigned char invalidate_cache;
	161	unsigned char create_serialize;
	162	unsigned char create_fsync;
	163	unsigned char end_fsync;
	164	unsigned char sync_io;
	165	unsigned char verify;
	166	unsigned char use_thread;
	167	unsigned char do_disk_util;
	168	unsigned char override_sync;
	169	unsigned char rand_repeatable;
	170
	171	unsigned int bs;
	172	unsigned int min_bs;
	173	unsigned int max_bs;
	174	unsigned int thinktime;
	175	unsigned int fsync_blocks;
	176	unsigned int start_delay;
	177	unsigned long timeout;
	178	unsigned int overwrite;
	179	unsigned int bw_avg_time;
	180	unsigned int loops;
	181	unsigned long long file_size;
	182	unsigned long long real_file_size;
	183	unsigned long long file_offset;
	184	unsigned long long zone_size;
	185	unsigned long long zone_skip;
	186	enum fio_memtype mem_type;
	187	unsigned int stonewall;
	188	unsigned int numjobs;
	189	unsigned int iodepth;
	190	os_cpu_mask_t cpumask;
	191	unsigned int iolog;
	192	unsigned int read_iolog;
	193	unsigned int write_iolog;
	194	unsigned int rwmixcycle;
	195	unsigned int rwmixread;
	196	unsigned int nice;
	197
	198	char *iolog_file;
	199	void *iolog_buf;
	200	FILE *iolog_f;
	201
	202	char *sysfs_root;
	203	char *ioscheduler;
	204
	205	os_random_state_t bsrange_state;
	206	os_random_state_t verify_state;
	207
	208	int shm_id;
	209
	210	/*
	211	* IO engine hooks, contains everything needed to submit an io_u
	212	* to any of the available IO engines.
	213	*/
	214	struct ioengine_ops *io_ops;
	215
	216	/*
	217	* Current IO depth and list of free and busy io_u's.
	218	*/
	219	unsigned int cur_depth;
	220	struct list_head io_u_freelist;
	221	struct list_head io_u_busylist;
	222
	223	/*
	224	* Rate state
	225	*/
	226	unsigned int rate;
	227	unsigned int ratemin;
	228	unsigned int ratecycle;
	229	unsigned long rate_usec_cycle;
	230	long rate_pending_usleep;
	231	unsigned long rate_bytes;
	232	struct timeval lastrate;
	233
	234	unsigned long runtime[2]; /* msec */
	235	unsigned long long io_size;
	236	unsigned long long total_io_size;
	237
	238	unsigned long long io_blocks[2];
	239	unsigned long long io_bytes[2];
	240	unsigned long long zone_bytes;
	241	unsigned long long this_io_bytes[2];
	242	unsigned long long last_pos;
	243	volatile int mutex;
	244
	245	/*
	246	* State for random io, a bitmap of blocks done vs not done
	247	*/
	248	os_random_state_t random_state;
	249	unsigned long *file_map;
	250	unsigned int num_maps;
	251
	252	/*
	253	* CPU "io" cycle burner
	254	*/
	255	unsigned int cpuload;
	256	unsigned int cpucycle;
	257
	258	/*
	259	* bandwidth and latency stats
	260	*/
	261	struct io_stat clat_stat[2]; /* completion latency */
	262	struct io_stat slat_stat[2]; /* submission latency */
	263	struct io_stat bw_stat[2]; /* bandwidth stats */
	264
	265	unsigned long long stat_io_bytes[2];
	266	struct timeval stat_sample_time[2];
	267
	268	struct io_log *slat_log;
	269	struct io_log *clat_log;
	270	struct io_log *bw_log;
	271
	272	struct timeval start; /* start of this loop */
	273	struct timeval epoch; /* time job was started */
	274
	275	/*
	276	* fio system usage accounting
	277	*/
	278	struct rusage ru_start;
	279	struct rusage ru_end;
	280	unsigned long usr_time;
	281	unsigned long sys_time;
	282	unsigned long ctx;
	283
	284	/*
	285	* read/write mixed workload state
	286	*/
	287	os_random_state_t rwmix_state;
	288	struct timeval rwmix_switch;
	289	enum fio_ddir rwmix_ddir;
	290
	291	/*
	292	* Pre-run and post-run shell
	293	*/
	294	char *exec_prerun;
	295	char *exec_postrun;
	296
	297	/*
	298	* IO historic logs
	299	*/
	300	struct list_head io_hist_list;
	301	struct list_head io_log_list;
	302	};
	303
	304	#define __td_verror(td, err, msg) \
	305	do { \
	306	int e = (err); \
	307	(td)->error = e; \
	308	snprintf(td->verror, sizeof(td->verror) - 1, "file:%s:%d, error=%s", __FILE__, __LINE__, (msg)); \
	309	} while (0)
	310
	311
	312	#define td_verror(td, err) __td_verror((td), (err), strerror((err)))
	313	#define td_vmsg(td, err, msg) __td_verror((td), (err), (msg))
	314
	315	extern struct io_u __get_io_u(struct thread_data );
	316	extern void put_io_u(struct thread_data , struct io_u );
	317
	318	extern int rate_quit;
	319	extern int write_lat_log;
	320	extern int write_bw_log;
	321	extern int exitall_on_terminate;
	322	extern int thread_number;
	323	extern int shm_id;
	324	extern int groupid;
	325	extern int terse_output;
	326	extern FILE *f_out;
	327	extern FILE *f_err;
	328	extern char *fio_inst_prefix;
	329
	330	extern struct thread_data *threads;
	331
	332	#define td_read(td) ((td)->ddir == DDIR_READ)
	333	#define td_write(td) ((td)->ddir == DDIR_WRITE)
	334	#define td_rw(td) ((td)->iomix != 0)
	335
	336	#define BLOCKS_PER_MAP (8 * sizeof(long))
	337	#define TO_MAP_BLOCK(td, b) ((b) - ((td)->file_offset / (td)->min_bs))
	338	#define RAND_MAP_IDX(td, b) (TO_MAP_BLOCK(td, b) / BLOCKS_PER_MAP)
	339	#define RAND_MAP_BIT(td, b) (TO_MAP_BLOCK(td, b) & (BLOCKS_PER_MAP - 1))
	340
	341	#define MAX_JOBS (1024)
	342
	343	struct disk_util_stat {
	344	unsigned ios[2];
	345	unsigned merges[2];
	346	unsigned long long sectors[2];
	347	unsigned ticks[2];
	348	unsigned io_ticks;
	349	unsigned time_in_queue;
	350	};
	351
	352	struct disk_util {
	353	struct list_head list;
	354
	355	char *name;
	356	char path[256];
	357	dev_t dev;
	358
	359	struct disk_util_stat dus;
	360	struct disk_util_stat last_dus;
	361
	362	unsigned long msec;
	363	struct timeval time;
	364	};
	365
	366	struct io_completion_data {
	367	int nr; /* input */
	368
	369	int error; /* output */
	370	unsigned long bytes_done[2]; /* output */
	371	};
	372
	373	#define DISK_UTIL_MSEC (250)
	374
	375	#ifndef min
	376	#define min(a, b) ((a) < (b) ? (a) : (b))
	377	#endif
	378
	379	/*
	380	* Log exports
	381	*/
	382	extern int read_iolog_get(struct thread_data , struct io_u );
	383	extern void write_iolog_put(struct thread_data , struct io_u );
	384	extern int init_iolog(struct thread_data *td);
	385	extern void log_io_piece(struct thread_data , struct io_u );
	386	extern void prune_io_piece_log(struct thread_data *);
	387	extern void write_iolog_close(struct thread_data *);
	388
	389	/*
	390	* Logging
	391	*/
	392	extern void add_clat_sample(struct thread_data *, int, unsigned long);
	393	extern void add_slat_sample(struct thread_data *, int, unsigned long);
	394	extern void add_bw_sample(struct thread_data *, int);
	395	extern void show_run_stats(void);
	396	extern void init_disk_util(struct thread_data *);
	397	extern void update_rusage_stat(struct thread_data *);
	398	extern void update_io_ticks(void);
	399	extern void disk_util_timer_arm(void);
	400	extern void setup_log(struct io_log **);
	401	extern void finish_log(struct thread_data , struct io_log , const char *);
	402	extern int setup_rate(struct thread_data *);
	403
	404	/*
	405	* Time functions
	406	*/
	407	extern unsigned long utime_since(struct timeval , struct timeval );
	408	extern unsigned long mtime_since(struct timeval , struct timeval );
	409	extern unsigned long mtime_since_now(struct timeval *);
	410	extern unsigned long time_since_now(struct timeval *);
	411	extern void __usec_sleep(unsigned int);
	412	extern void usec_sleep(struct thread_data *, unsigned long);
	413	extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);
	414
	415	/*
	416	* Init functions
	417	*/
	418	extern int parse_options(int, char **);
	419	extern int init_random_state(struct thread_data *);
	420
	421	/*
	422	* This is a pretty crappy semaphore implementation, but with the use that fio
	423	* has (just signalling start/go conditions), it doesn't have to be better.
	424	* Naturally this would not work for any type of contended semaphore or
	425	* for real locking.
	426	*/
	427	static inline void fio_sem_init(volatile int *sem, int val)
	428	{
	429	*sem = val;
	430	}
	431
	432	static inline void fio_sem_down(volatile int *sem)
	433	{
	434	while (*sem == 0)
	435	usleep(10000);
	436
	437	(*sem)--;
	438	}
	439
	440	static inline void fio_sem_up(volatile int *sem)
	441	{
	442	(*sem)++;
	443	}
	444
	445	/*
	446	* If logging output to a file, stderr should go to both stderr and f_err
	447	*/
	448	#define log_err(args...) do { \
	449	fprintf(f_err, ##args); \
	450	if (f_err != stderr) \
	451	fprintf(stderr, ##args); \
	452	} while (0)
	453
	454	struct ioengine_ops {
	455	char name[16];
	456	int version;
	457	int flags;
	458	int (setup)(struct thread_data );
	459	int (init)(struct thread_data );
	460	int (prep)(struct thread_data , struct io_u *);
	461	int (queue)(struct thread_data , struct io_u *);
	462	int (getevents)(struct thread_data , int, int, struct timespec *);
	463	struct io_u (event)(struct thread_data *, int);
	464	int (cancel)(struct thread_data , struct io_u *);
	465	void (cleanup)(struct thread_data );
	466	int (sync)(struct thread_data );
	467	void *data;
	468	void *dlhandle;
	469	};
	470
	471	#define FIO_IOOPS_VERSION 1
	472
	473	extern struct ioengine_ops load_ioengine(struct thread_data , char *);
	474	extern void close_ioengine(struct thread_data *);
	475
	476	/*
	477	* Mark unused variables passed to ops functions as unused, to silence gcc
	478	*/
	479	#define fio_unused __attribute((__unused__))
	480
	481	#endif