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authorStanislaw Halik <sthalik@misaki.pl>2017-05-12 15:40:49 +0200
committerStanislaw Halik <sthalik@misaki.pl>2017-05-12 15:40:49 +0200
commitd160fbec0c70095b725d612458ae9ee3aa8ed526 (patch)
tree84add8f7929b33adfe33cdbe2b8588f0813812a9
parentad496a028cee3e119177a3a7d9e9f4f0edb3f96c (diff)
compat/timer: add std::chrono support
-rw-r--r--compat/time.hpp25
-rw-r--r--compat/timer.cpp32
-rw-r--r--compat/timer.hpp18
3 files changed, 55 insertions, 20 deletions
diff --git a/compat/time.hpp b/compat/time.hpp
new file mode 100644
index 00000000..fbe7469a
--- /dev/null
+++ b/compat/time.hpp
@@ -0,0 +1,25 @@
+#pragma once
+
+#include <chrono>
+#include <type_traits>
+
+namespace time_units {
+
+template<typename repr, typename ratio>
+using duration = std::chrono::duration<repr, ratio>;
+
+template<typename t, typename u>
+static inline constexpr auto time_cast(const u& in)
+{
+ return std::chrono::duration_cast<t>(in);
+}
+
+using secs = duration<double, std::ratio<1, 1>>;
+using secs_ = duration<long long, std::ratio<1, 1>>;
+using ms = duration<double, std::milli>;
+using ms_ = duration<long long, std::milli>;
+using us = duration<double, std::micro>;
+using us_ = duration<long long, std::micro>;
+using ns = duration<long long, std::nano>;
+
+} // ns time_units
diff --git a/compat/timer.cpp b/compat/timer.cpp
index d5052ccb..3ecdf528 100644
--- a/compat/timer.cpp
+++ b/compat/timer.cpp
@@ -7,6 +7,7 @@
*/
#include "timer.hpp"
+#include <cmath>
Timer::Timer()
{
@@ -15,17 +16,20 @@ Timer::Timer()
void Timer::start()
{
- wrap_gettime(&state);
+ gettime(&state);
}
// common
-void Timer::wrap_gettime(timespec* state)
+void Timer::gettime(timespec* state)
{
#if defined(_WIN32) || defined(__MACH__)
otr_clock_gettime(state);
+#elif defined CLOCK_MONOTONIC
+ const int res = clock_gettime(CLOCK_MONOTONIC, state);
+ assert(res == 0 && "must support CLOCK_MONOTONIC");
#else
- (void) clock_gettime(CLOCK_MONOTONIC, state);
+# error "timer query method not known"
#endif
}
@@ -33,14 +37,13 @@ void Timer::wrap_gettime(timespec* state)
long long Timer::elapsed_nsecs() const
{
- struct timespec cur = {};
- wrap_gettime(&cur);
+ timespec cur{};
+ gettime(&cur);
return conv_nsecs(cur);
}
long long Timer::conv_nsecs(const timespec& cur) const
{
- // this can and will overflow
return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
}
@@ -48,8 +51,8 @@ long long Timer::conv_nsecs(const timespec& cur) const
double Timer::elapsed_usecs() const
{
- struct timespec cur = {};
- wrap_gettime(&cur);
+ timespec cur{};
+ gettime(&cur);
const long long nsecs = conv_nsecs(cur);
return nsecs * 1e-3;
}
@@ -73,27 +76,26 @@ double Timer::elapsed_seconds() const
#if defined _WIN32
LARGE_INTEGER Timer::otr_get_clock_frequency()
{
- LARGE_INTEGER freq = {};
+ LARGE_INTEGER freq{};
(void) QueryPerformanceFrequency(&freq);
return freq;
}
void Timer::otr_clock_gettime(timespec* ts)
{
- static LARGE_INTEGER freq = otr_get_clock_frequency();
+ static const LARGE_INTEGER freq = otr_get_clock_frequency();
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
using ll = long long;
- using ld = long double;
- const long long part = ll(d.QuadPart / ld(freq.QuadPart) * 1000000000.L);
+ const ll part = ll(std::roundl((d.QuadPart * 1000000000.L) / ll(freq.QuadPart)));
using t_s = decltype(ts->tv_sec);
using t_ns = decltype(ts->tv_nsec);
- ts->tv_sec = t_s(part / 1000000000LL);
- ts->tv_nsec = t_ns(part % 1000000000LL);
+ ts->tv_sec = t_s(part / 1000000000);
+ ts->tv_nsec = t_ns(part % 1000000000);
}
#elif defined __MACH__
@@ -106,7 +108,7 @@ mach_timebase_info_data_t Timer::otr_get_mach_frequency()
double Timer::otr_clock_gettime(timespec* ts)
{
- static mach_timebase_info_data_t timebase_info = otr_get_mach_frequency();
+ static const mach_timebase_info_data_t timebase_info = otr_get_mach_frequency();
uint64_t state, nsec;
state = mach_absolute_time();
nsec = state * timebase_info.numer / timebase_info.denom;
diff --git a/compat/timer.hpp b/compat/timer.hpp
index e9efba79..58e1c7d6 100644
--- a/compat/timer.hpp
+++ b/compat/timer.hpp
@@ -20,7 +20,9 @@
#include <ctime>
#include <tuple>
-class OTR_COMPAT_EXPORT Timer
+#include "time.hpp"
+
+class OTR_COMPAT_EXPORT Timer final
{
struct timespec state;
long long conv_nsecs(const struct timespec& cur) const;
@@ -31,16 +33,22 @@ class OTR_COMPAT_EXPORT Timer
static mach_timebase_info_data_t otr_get_mach_frequency();
#endif
- static void wrap_gettime(struct timespec* state);
+ static void gettime(struct timespec* state);
+ using ns = time_units::ns;
public:
Timer();
-
void start();
+
+ template<typename t>
+ t elapsed() const
+ {
+ using namespace time_units;
+ return static_cast<const t&>(ns(elapsed_nsecs()));
+ }
+
long long elapsed_nsecs() const;
double elapsed_usecs() const;
double elapsed_ms() const;
double elapsed_seconds() const;
};
-
-