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81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
#include <time.h>
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#include "genlib.h"
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#include "log.h"
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#define IM1 2147483563
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#define IM2 2147483399
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#define AM (1.0 / IM1)
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#define IMM1 (IM1 - 1)
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#define IA1 40014
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#define IA2 40692
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#define IQ1 53668
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#define IQ2 52774
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#define IR1 12211
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#define IR2 3791
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#define NTAB 32
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#define NDIV (1 + IMM1 / NTAB)
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#define EPS 1.2e-7
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#define RNMX (1.0 - EPS)
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double ran2(long* idum, long* idum2, long* iy, long iv[NTAB]) {
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double* used_ram_t0 = malloc(sizeof(double));
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getVirtualMemUsed(used_ram_t0);
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clock_t t = clock();
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int j;
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long k;
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double temp;
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log_info("RESULT = in progress");
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if (*idum <= 0) {
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if (-(*idum) < 1)
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*idum = 1;
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else
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*idum = -(*idum);
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*idum2 = (*idum);
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for (j = NTAB + 7; j >= 0; j--) {
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k = (*idum) / IQ1;
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*idum = IA1 * (*idum - k * IQ1) - k * IR1;
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if (*idum < 0)
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*idum += IM1;
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if (j < NTAB)
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iv[j] = *idum;
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}
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*iy = iv[0];
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}
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k = (*idum) / IQ1;
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*idum = IA1 * (*idum - k * IQ1) - k * IR1;
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if (*idum < 0)
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*idum += IM1;
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k = *idum2 / IQ2;
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*idum2 = IA2 * (*idum2 - k * IQ2) - k * IR2;
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if (*idum2 < 0)
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*idum2 += IM2;
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j = (*iy) / NDIV;
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*iy = iv[j] - (*idum2);
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iv[j] = *idum;
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if (*iy < 1)
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(*iy) += IMM1;
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t = clock() - t;
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double time_taken = ((double)t)/CLOCKS_PER_SEC; // calculate the elapsed time
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double* used_ram_tf = malloc(sizeof(double));
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getVirtualMemUsed(used_ram_tf);
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if ((temp = AM * (*iy)) > RNMX) {
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log_info("RESULT = success, ELAPSED = %f, DIF USED VIRTUAL MEM = %5.1f MB", time_taken, *used_ram_tf - *used_ram_t0);
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return (RNMX);
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}
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else {
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log_info("RESULT = success, temp = %f, ELAPSED = %f seconds, DIF USED VIRTUAL MEM = %5.1f MB", temp, time_taken, *used_ram_tf - *used_ram_t0);
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return temp;
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}
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free(used_ram_t0);
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free(used_ram_tf);
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}
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