[feat] add clock module

src/common/clock/system_clock.cpp

@@ -0,0 +1,122 @@
+#include "system_clock.h"
+
+#include <time.h>
+
+#include <cstdint>
+#include <limits>
+
+#if defined(__POSIX__)
+#include <sys/time.h>
+#endif
+#if defined(__APPLE__)
+#include <mach/mach_time.h>
+#endif
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+int64_t SystemClock::CurrentTimeNs() {
+  int64_t ticks = -1;  // Default to error case
+
+#if defined(__APPLE__)
+  static mach_timebase_info_data_t timebase;
+  if (timebase.denom == 0 && mach_timebase_info(&timebase) != KERN_SUCCESS) {
+    return -1;  // Error case for macOS timebase info retrieval
+  }
+  ticks = static_cast<int64_t>(mach_absolute_time() * timebase.numer) /
+          timebase.denom;
+
+#elif defined(__POSIX__)
+  struct timespec ts;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
+    return -1;  // Error case for POSIX clock retrieval
+  }
+  ticks = static_cast<int64_t>(ts.tv_sec) * kNumNanosecsPerSec +
+          static_cast<int64_t>(ts.tv_nsec);
+
+#elif defined(_WIN32)
+  static volatile LONG last_timegettime = 0;
+  static volatile int64_t num_wrap_timegettime = 0;
+  volatile LONG* last_timegettime_ptr = &last_timegettime;
+
+  DWORD now = timeGetTime();
+  DWORD old = InterlockedExchange(last_timegettime_ptr, now);
+
+  if (now < old) {
+    // Handle wraparound (when timeGetTime() wraps around after ~49.7 days)
+    if (old > 0xf0000000 && now < 0x0fffffff) {
+      num_wrap_timegettime++;
+    }
+  }
+
+  // Convert milliseconds to nanoseconds and add wraparound offset
+  ticks = static_cast<int64_t>(now) + (num_wrap_timegettime << 32);
+  ticks *= 1000000;
+#endif
+
+  return ticks;
+}
+
+int64_t SystemClock::CurrentTimeUs() { return CurrentTimeNs() / 1000LL; }
+
+int64_t SystemClock::CurrentTimeMs() { return CurrentTimeNs() / 1000000LL; }
+
+int64_t SystemClock::CurrentTime() { return CurrentTimeNs() / 1000000000LL; }
+
+int64_t SystemClock::CurrentNtpTime() {
+  int64_t current_time_s = CurrentTime();
+  return current_time_s + kNtpEpochOffset;
+}
+
+int64_t SystemClock::CurrentNtpTimeMs() {
+  return CurrentTimeMs() + kNtpEpochOffset * 1000LL;
+}
+
+int64_t SystemClock::CurrentNtpTimeUs() {
+  return CurrentTimeUs() + kNtpEpochOffset * 1000000LL;
+}
+
+int64_t SystemClock::CurrentNtpTimeNs() {
+  return CurrentTimeNs() + kNtpEpochOffset * 1000000000LL;
+}
+
+int64_t SystemClock::CurrentUtcTimeNs() {
+#if defined(__POSIX__)
+  struct timeval time;
+  gettimeofday(&time, nullptr);
+  return (static_cast<int64_t>(time.tv_sec) * 1000000000 + time.tv_usec * 1000);
+#elif defined(_WIN32)
+  FILETIME file_time;
+  GetSystemTimeAsFileTime(&file_time);
+  int64_t file_time_100ns =
+      ((int64_t)file_time.dwHighDateTime << 32) | file_time.dwLowDateTime;
+  constexpr int64_t kUnixEpochFileTimeOffsetIn100ns = 116444736000000000LL;
+  return (file_time_100ns - kUnixEpochFileTimeOffsetIn100ns) * 100;
+#elif defined(__APPLE__)
+  struct timespec ts;
+  if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
+    return -1;  // Error case for macOS clock retrieval
+  }
+  return static_cast<int64_t>(ts.tv_sec) * 1000000000LL + ts.tv_nsec;
+#endif
+  return 0;
+}
+
+int64_t SystemClock::CurrentUtcTimeUs() { return CurrentUtcTimeNs() / 1000LL; }
+
+int64_t SystemClock::CurrentUtcTimeMs() {
+  return CurrentUtcTimeNs() / 1000000LL;
+}
+
+int64_t SystemClock::CurrentUtcTime() {
+  return CurrentUtcTimeNs() / 1000000000LL;
+}
+
+static SystemClock* GetSystemClock() {
+  static SystemClock* const clock = new SystemClock();
+  return clock;
+}
+
+static std::shared_ptr<SystemClock> GetSystemClockShared() {
+  return std::make_shared<SystemClock>();
+}

src/common/clock/system_clock.h

@@ -0,0 +1,39 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2025-02-19
+ * Copyright (c) 2025 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _SYSTEM_CLOCK_H_
+#define _SYSTEM_CLOCK_H_
+
+#include <cstdint>
+#include <memory>
+
+static const int64_t kNtpEpochOffset = 2208988800LL;
+
+class SystemClock {
+ public:
+  SystemClock() = default;
+  ~SystemClock() = default;
+
+  int64_t CurrentTime();
+  int64_t CurrentTimeMs();
+  int64_t CurrentTimeUs();
+  int64_t CurrentTimeNs();
+
+  int64_t CurrentNtpTime();
+  int64_t CurrentNtpTimeMs();
+  int64_t CurrentNtpTimeUs();
+  int64_t CurrentNtpTimeNs();
+
+  int64_t CurrentUtcTime();
+  int64_t CurrentUtcTimeMs();
+  int64_t CurrentUtcTimeUs();
+  int64_t CurrentUtcTimeNs();
+};
+
+static SystemClock* GetSystemClock();
+static std::shared_ptr<SystemClock> GetSystemClockShared();
+
+#endif

xmake.lua

@@ -43,6 +43,7 @@ target("common")
     set_kind("object")
     add_deps("log")
     add_files("src/common/common.cpp", 
+    "src/common/clock/system_clock.cpp", 
     "src/common/rtc_base/*.cc",
     "src/common/rtc_base/network/*.cc",
     "src/common/rtc_base/numerics/*.cc",