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54 lines
1.7 KiB
Scheme
54 lines
1.7 KiB
Scheme
;;;; Cyclone Scheme
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;;;; https://github.com/justinethier/cyclone
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;;;;
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;;;; Copyright (c) 2014-2016, Justin Ethier
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;;;; All rights reserved.
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;;;;
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;;;; This module contains the time library from r7rs.
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;;;;
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(define-library (scheme time)
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(export
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current-second
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current-jiffy
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jiffies-per-second
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)
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(include-c-header "<sys/time.h>")
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(import (scheme base)
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)
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;; TODO: get an FFI syntax for including C header files, even if it is not needed for this library
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(begin
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(define-c current-second
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"(void *data, int argc, closure _, object k)"
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" make_double(box, 0.0);
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time_t t = time(NULL);
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double_value(&box) = t;
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return_closcall1(data, k, &box); ")
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(define-c current-jiffy
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"(void *data, int argc, closure _, object k)"
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" struct timeval tv;
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make_double(box, 0.0);
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gettimeofday(&tv, NULL); /* TODO: longer-term consider using clock_gettime instead */
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long long jiffy = (tv.tv_sec)*1000000LL + tv.tv_usec;
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/* Future consideration:
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mp_int bn_tmp, bn_tmp2, bn_tmp3;
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mp_init(&bn_tmp);
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mp_init(&bn_tmp2);
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mp_init(&bn_tmp3);
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Cyc_int2bignum(tv.tv_sec, &bn_tmp);
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Cyc_int2bignum(1000000LL, &bn_tmp2);
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Cyc_int2bignum(tv.tv_usec, &bn_tmp3);
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alloc_bignum(data, box);
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mp_mul(&bn_tmp, &bn_tmp2, &bn_tmp);
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mp_add(&bn_tmp, &bn_tmp3, &bignum_value(box));
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mp_clear(&bn_tmp);
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mp_clear(&bn_tmp2);
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mp_clear(&bn_tmp3);
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*/
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double_value(&box) = jiffy;
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return_closcall1(data, k, &box); ")
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(define-c jiffies-per-second
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"(void *data, int argc, closure _, object k)"
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" int n = 1000000;
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object obj = obj_int2obj(n);
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return_closcall1(data, k, obj); ")
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))
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