posix_clock.cpp
#include "HalideRuntime.h"
#ifndef _STRUCT_TIMEVAL
#define _STRUCT_TIMEVAL
#ifdef BITS_64
struct timeval {
int64_t tv_sec, tv_usec;
};
#else
struct timeval {
int32_t tv_sec, tv_usec;
};
#endif
#endif
namespace Halide { namespace Runtime { namespace Internal {
WEAK bool halide_reference_clock_inited = false;
WEAK timeval halide_reference_clock;
}}} // namespace Halide::Runtime::Internal
extern "C" {
extern int gettimeofday(timeval *tv, void *);
WEAK int halide_start_clock(void *user_context) {
// Guard against multiple calls
if (!halide_reference_clock_inited) {
gettimeofday(&halide_reference_clock, NULL);
halide_reference_clock_inited = true;
}
return 0;
}
// clock_gettime() is preferred over gettimeofday(), but OSX
// doesn't provide the former. (Use linux_clock.cpp to use clock_gettime(),
// which will provide actual nanosecond accuracy.)
WEAK int64_t halide_current_time_ns(void *user_context) {
timeval now;
gettimeofday(&now, NULL);
int64_t d = int64_t(now.tv_sec - halide_reference_clock.tv_sec)*1000000;
int64_t ud = int64_t(now.tv_usec) - int64_t(halide_reference_clock.tv_usec);
return (d + ud) * 1000;
}
extern int usleep(int);
WEAK void halide_sleep_ms(void *user_context, int ms) {
usleep(ms * 1000);
}
}