1 // random_state constructor.
4 #if defined(_WIN32) && !defined(__CYGWIN__)
5 #include <windows.h> // For GetCurrentProcessId(), must be included first, sorry.
9 #include "base/cl_sysdep.h"
12 #include "cln/random.h"
17 #include "base/cl_base_config.h"
18 #include "base/cl_low.h"
19 #include <cstdlib> // declares rand()
21 #if defined(unix) || defined(__unix) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(_AIX) || defined(sinix) || (defined(__MACH__) && defined(__APPLE__)) || (defined(__CYGWIN__) && defined(__GNUC__)) || defined(__BEOS__)
23 #include <sys/types.h>
24 #include <unistd.h> // declares getpid()
26 #if defined(HAVE_GETTIMEOFDAY)
30 inline uint32 get_seed (void)
32 var struct timeval tv;
33 gettimeofday(&tv,NULL);
34 return highlow32(tv.tv_sec,tv.tv_usec); // 16+16 zufällige Bits
40 #elif defined(_WIN32) && !defined(__CYGWIN__)
42 /* <windows.h> included above. */
45 inline uint32 get_seed (void)
47 FILETIME current_time;
49 GetSystemTimeAsFileTime (¤t_time);
51 /* Convert from FILETIME to 'struct timeval'. */
52 /* FILETIME: <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ns-minwinbase-filetime> */
53 ULONGLONG since_1601 =
54 ((ULONGLONG) current_time.dwHighDateTime << 32)
55 | (ULONGLONG) current_time.dwLowDateTime;
56 /* Divide by 20 ms, and take the low-order 32 bits. */
57 return (ULONG) (since_1601 / 2000000);
65 // Counter, to avoid that two random-states created immediately one after
66 // the other contain the same seed.
67 static uint32 counter = 0;
69 random_state::random_state ()
73 #if defined(unix) || defined(__unix) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(_AIX) || defined(sinix) || (defined(__MACH__) && defined(__APPLE__)) || (defined(__CYGWIN__) && defined(__GNUC__)) || defined(__BEOS__)
75 seed_hi = (rand() // zufällige 31 Bit (bei UNIX_BSD) bzw. 16 Bit (bei UNIX_SYSV)
76 << 8) ^ (uintL)(getpid()); // ca. 8 Bit von der Process ID
77 #elif defined(__OpenBSD__)
78 seed_lo = arc4random();
79 seed_hi = arc4random();
80 #elif defined(_WIN32) && !defined(__CYGWIN__)
82 seed_hi = (rand() << 8) ^ (uintL)(GetCurrentProcessId());
83 #elif defined(__atarist)
84 seed_lo = highlow32(GEMDOS_GetDate(),GEMDOS_GetTime()); // 16+16 zufällige Bits
85 seed_hi = XBIOS_Random(); // 24 Bit zufällig vom XBIOS, vorne 8 Nullbits
86 #elif defined(amiga) || defined(AMIGA)
87 seed_lo = get_real_time(); // Uhrzeit
88 seed_hi = FindTask(NULL); // Pointer auf eigene Task
89 #elif defined(__MSDOS__) || defined(__EMX__) || defined(__riscos)
90 // Keine Zufallszahlen, keine PID, nichts Zufälliges da.
91 seed_lo = get_real_time(); // Uhrzeit, 100 Hz
94 #error "Must implement random_state constructor!"
96 seed_hi ^= counter++ << 5;