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Change implementation of acl_hal_mmd_get_timestamp() to use std::chro… #41

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Change implementation of acl_hal_mmd_get_timestamp() to use std::chro… #41

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20 changes: 3 additions & 17 deletions src/acl_hal_mmd.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
#include <dirent.h>
#include <dlfcn.h>
#include <link.h>
#include <chrono>
#endif

#ifdef _MSC_VER
Expand Down Expand Up @@ -2401,24 +2402,9 @@ cl_ulong acl_hal_mmd_get_timestamp() {

// Query the system timer, return a timer value in ns
cl_ulong acl_hal_mmd_get_timestamp() {
struct timespec a;
const cl_ulong NS_PER_S = 1000000000;
acl_assert_locked_or_sig();
// Must use the MONOTONIC clock because the REALTIME clock
// can go backwards due to adjustments by NTP for clock drift.
// The MONOTONIC clock provides a timestamp since some fixed point in
// the past, which might be system boot time or the start of the Unix
// epoch. This matches the Windows QueryPerformanceCounter semantics.
// The MONOTONIC clock is to be used for measuring time intervals, and
// fits the semantics of timestamps from the *device* perspective as defined
// in OpenCL for clGetEventProfilingInfo.
#ifdef CLOCK_MONOTONIC_RAW
clock_gettime(CLOCK_MONOTONIC_RAW, &a);
#else
clock_gettime(CLOCK_MONOTONIC, &a);
#endif

return (cl_ulong)(a.tv_nsec) + (cl_ulong)(a.tv_sec * NS_PER_S);
unsigned long nano_timestamp = std::chrono::steady_clock::now().time_since_epoch() / std::chrono::milliseconds(1);
return (cl_ulong)nano_timestamp;
}
#endif

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