vlc_rand.h File Reference

This file defined random number generator function in vlc. More...

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Functions
void	vlc_rand_bytes (void *buf, size_t len)
double	vlc_drand48 (void)
	PRNG uniformly distributed between 0.0 and 1.0 with 48-bits precision.
long	vlc_lrand48 (void)
	PRNG uniformly distributed between 0 and 2^32 - 1.
long	vlc_mrand48 (void)
	PRNG uniformly distributed between -2^32 and 2^32 - 1.

Detailed Description

This file defined random number generator function in vlc.

Function Documentation

vlc_drand48()

double vlc_drand48

(

void

)

PRNG uniformly distributed between 0.0 and 1.0 with 48-bits precision.

Note

Contrary to POSIX drand48(), this function is thread-safe.

Warning

Series generated by this function are not reproducible. Use erand48() if you need reproducible series.

Returns

a double value within [0.0, 1.0] inclusive

References erand48(), init_rand48(), rand48, vlc_mutex_lock(), and vlc_mutex_unlock().

vlc_lrand48()

long vlc_lrand48

(

void

)

PRNG uniformly distributed between 0 and 2^32 - 1.

Note

Contrary to POSIX lrand48(), this function is thread-safe.

Warning

Series generated by this function are not reproducible. Use nrand48() if you need reproducible series.

Returns

an integral value within [0.0, 2^32-1] inclusive

References init_rand48(), nrand48(), rand48, vlc_mutex_lock(), and vlc_mutex_unlock().

vlc_mrand48()

long vlc_mrand48

(

void

)

PRNG uniformly distributed between -2^32 and 2^32 - 1.

Note

Contrary to POSIX mrand48(), this function is thread-safe.

Warning

Series generated by this function are not reproducible. Use jrand48() if you need reproducible series.

Returns

an integral value within [-2^32, 2^32-1] inclusive

References init_rand48(), jrand48(), rand48, vlc_mutex_lock(), and vlc_mutex_unlock().

Referenced by httpd_StreamCallBack().

vlc_rand_bytes()

void vlc_rand_bytes	(	void *	buf,
		size_t	len
	)

References ikey, lock, okey, TIME_UTC, timespec_get(), VLC_HASH_MD5_DIGEST_SIZE, vlc_hash_md5_Finish(), vlc_hash_md5_Init(), vlc_hash_md5_Update(), vlc_mutex_lock(), vlc_mutex_unlock(), vlc_rand_init(), and VLC_STATIC_MUTEX.

Referenced by GenerateCnonce(), init_rand48(), randomizer_Init(), vlc_mkstemp(), and vlc_playlist_Shuffle().