rand.c File Reference

Include dependency graph for rand.c:

Functions
static void	init_rand48 (void)
double	vlc_drand48 (void)
	PRNG uniformly distributed between 0.0 and 1.0 with 48-bits precision. More...
long	vlc_lrand48 (void)
	PRNG uniformly distributed between 0 and 2^32 - 1. More...
long	vlc_mrand48 (void)
	PRNG uniformly distributed between -2^32 and 2^32 - 1. More...

Variables
struct {
bool   init
unsigned short   subi [3]
vlc_mutex_t   lock
}	rand48 = { false, { 0, 0, 0, }, { .value = ATOMIC_VAR_INIT(0), .recursion = ATOMIC_VAR_INIT(0), .owner = ATOMIC_VAR_INIT(0), } , }

Function Documentation

init_rand48()

static void init_rand48 ( void  )

static

References rand48, subi, and vlc_rand_bytes().

Referenced by vlc_drand48(), vlc_lrand48(), and vlc_mrand48().

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().

Variable Documentation

init

bool init

Referenced by vlc_CPU_functions_init().

lock

vlc_mutex_t lock

Referenced by config_SaveConfigFile(), HRESULT(), sout_StreamLock(), sout_StreamUnlock(), vlc_global_mutex(), and vlc_rand_bytes().

struct { ... } rand48

Referenced by init_rand48(), vlc_drand48(), vlc_lrand48(), and vlc_mrand48().

subi

unsigned short subi[3]

Referenced by init_rand48().