mirror of https://github.com/yandex/odyssey.git
52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
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/*
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* machinarium.
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*
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* cooperative multitasking engine.
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*/
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#include <assert.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <time.h>
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__thread unsigned short prng_seed[3];
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__thread unsigned short *prng_state = NULL;
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long int pg_lrand48(unsigned short *_rand48_seed);
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void pg_srand48(long seed, unsigned short *_rand48_seed);
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void
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mm_lrand48_seed()
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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long int rand_seed_2 = 0;
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long int rand_seed;
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rand_seed = getpid() ^ getuid() ^ tv.tv_sec ^ tv.tv_usec;
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int fd;
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fd = open("/dev/random", O_RDONLY);
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if (fd == -1)
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fd = open("/dev/urandom", O_RDONLY);
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if (fd != -1) {
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int rc = read(fd, &rand_seed_2, sizeof(rand_seed_2));
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(void)rc;
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close(fd);
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}
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rand_seed ^= rand_seed_2;
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pg_srand48(rand_seed, prng_seed);
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prng_state = prng_seed;
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}
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long int machine_lrand48()
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{
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assert(prng_state);
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return pg_lrand48(prng_state);
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}
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