posix_clock.cpp
#include "HalideRuntime.h"
#include "posix_timeval.h"
namespace Halide {
namespace Runtime {
namespace Internal {
WEAK bool halide_reference_clock_inited = false;
WEAK timeval halide_reference_clock;
} // namespace Internal
} // namespace Runtime
} // namespace Halide
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, nullptr);
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) {
// It is an error to call halide_current_time_ns() if halide_start_clock() has never been called
halide_debug_assert(user_context, halide_reference_clock_inited);
timeval now;
gettimeofday(&now, nullptr);
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);
}
}