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#ifdef __cplusplus
extern "C" {
#endif
#define MIN_PERL_DEFINE 1
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef __cplusplus
}
#endif
/* Is time() portable everywhere? Hope so! XXX */
static NV fallback_NVtime()
{ return time(0); }
static void fallback_U2time(U32 *ret)
{
ret[0]=time(0);
ret[1]=0;
}
/*-----------------*/
static int Installed=0;
static NV (*realNVtime)();
static void (*realU2time)(U32 *);
static double Lost; /** time relative to now */
static double Scale; /** speed of time (.5 == half speed) */
static void reset_warp()
{
Lost=0;
Scale=1;
}
/*-----------------*/
static NV warped_NVtime()
{
return (*realNVtime)() * Scale + Lost;
}
static void warped_U2time(U32 *ret)
{
/* performance doesn't matter enough for a native
non-float implementation */
double now = warped_NVtime();
U32 unow = now;
ret[0] = unow;
ret[1] = (now - unow) * 1000000;
}
MODULE = Time::Warp PACKAGE = Time::Warp
PROTOTYPES: ENABLE
void
install_time_api()
CODE:
{
SV **svp;
if (Installed) {
warn("Time::Warp::install_time_api() called more than once");
return;
}
Installed=1;
svp = hv_fetch(PL_modglobal, "Time::NVtime", 12, 0);
if (!svp) {
warn("Time::Warp: Time::HiRes is not loaded --\n\tat best 1s time accuracy is available");
hv_store(PL_modglobal, "Time::NVtime", 12,
newSViv((IV) fallback_NVtime), 0);
hv_store(PL_modglobal, "Time::U2time", 12,
newSViv((IV) fallback_U2time), 0);
}
svp = hv_fetch(PL_modglobal, "Time::NVtime", 12, 0);
if (!SvIOK(*svp)) croak("Time::NVtime isn't a function pointer");
realNVtime = (NV(*)()) SvIV(*svp);
svp = hv_fetch(PL_modglobal, "Time::U2time", 12, 0);
if (!SvIOK(*svp)) croak("Time::U2time isn't a function pointer");
realU2time = (void(*)(U32*)) SvIV(*svp);
hv_store(PL_modglobal, "Time::NVtime", 12,
newSViv((IV) warped_NVtime), 0);
hv_store(PL_modglobal, "Time::U2time", 12,
newSViv((IV) warped_U2time), 0);
reset_warp();
}
void
reset()
CODE:
reset_warp();
void
to(when)
double when
CODE:
{
Lost = when - (*realNVtime)() * Scale;
}
void
scale(...)
PREINIT:
double new_Scale;
PPCODE:
{
if (items == 0) {
XPUSHs(sv_2mortal(newSVnv(Scale)));
} else {
new_Scale = SvNV(ST(0));
if (new_Scale < 0) {
warn("Sorry, Time::Warp cannot go backwards");
new_Scale = 1;
}
else if (new_Scale < .001) {
warn("Sorry, Time::Warp cannot stop time");
new_Scale = .001;
}
Lost += (*realNVtime)() * (Scale - new_Scale);
Scale = new_Scale;
}
}
void
time()
PPCODE:
{
XPUSHs(sv_2mortal(newSVnv(warped_NVtime())));
}
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