118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
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#include <limits.h>
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#ifdef WIN32
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#include <time.h>
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#include <tchar.h>
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#endif
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#include "_osdef.h"
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#include "Tick.h"
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#include "Lock.h"
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using namespace wylib::time::tick64;
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static TICKCOUNT64 UserSetTick = 0;
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#ifndef WIN32
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unsigned int timeGetTime()
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{
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unsigned int uptime = 0;
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struct timespec on;
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if(clock_gettime(CLOCK_MONOTONIC, &on) == 0)
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uptime = on.tv_sec*1000 + on.tv_nsec/1000000;
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return uptime;
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}
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#endif
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/***
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实际测试的性能表明，基于timeGetTime实现的GetTickCount64具有较高的性能，
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而基于QueryPerformanceCounter的实现则是timeGetTime版本时间消耗的300倍
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***/
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//static LONG dwAtomLock = 0;
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#ifdef WIN32
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static MMRESULT mmPeriod = timeBeginPeriod(1);
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#endif
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static TICKCOUNT64 llTickBase = 0;
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static TICKCOUNT64 llStartTick = timeGetTime();
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static DWORD dwLastShortTick = timeGetTime();
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TICKCOUNT64 wylib::time::tick64::GetTickCount64()
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{
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if (UserSetTick)
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return UserSetTick;
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/*
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此处需要将dwLastShortTick导致保存为局部变量并尝试通过保存的值以锁总线的方式改变dwLastShortTick的值。
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由于在检测并修改dwLastShortTick的值的期间，当前线程可能由于进程调度而使得线程被挂起。当前线程被挂
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起的期间如果其他线程也执行了此函数则该线程会先于此线程修改dwLastShortTick的值。当本线程在恢复后再修改
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dwLastShortTick的值将导致错误的结果并会错误的判断为进入了一个49天的循环并修改llTickBase的值，从而导
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致所有后续调用的返回值全部错误的问题！
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为尽量降低数据同步的开销，不能使用临界区等方式来同步数据，故必须使用原子加锁操作指令代替。
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*/
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DWORD dwLastTick = dwLastShortTick;
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DWORD dwTick = timeGetTime();
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#ifdef WIN32
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if (InterlockedCompareExchange((volatile long*)&dwLastShortTick, (long)dwTick, (long)dwLastTick) == dwLastTick)
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#else
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if (__sync_val_compare_and_swap((volatile long*)&dwLastShortTick, (long)dwLastTick, (long)dwTick) == dwLastTick)
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#endif
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{
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if (dwTick < dwLastTick)
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{
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#ifdef WIN32
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if (IsDebuggerPresent())
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{
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//请手动确认此处是否未发生BUG，而是系统真正的经过了49天的循环，并按继续键……
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OutputDebugString(_T("请手动确认此处是否未发生BUG，而是系统真正的经过了49天的循环"));
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DebugBreak();
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}
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llTickBase += 0x1UI64 << 32;
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#else
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llTickBase += 0x1LL << 32;
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#endif
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}
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}
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return llTickBase + dwTick - llStartTick;
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}
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/*
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TICKCOUNT64 wylib::time::tick64::GetTickCount64()
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{
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if (UserSetTick)
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return UserSetTick;
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static LARGE_INTEGER Frequency;
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static BOOL boSuportPerformanceTick = QueryPerformanceFrequency(&Frequency);
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LARGE_INTEGER tick;
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TICKCOUNT64 sec, milpart;
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if ( !boSuportPerformanceTick )
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{
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return timeGetTime();
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}
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QueryPerformanceCounter( &tick );
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sec = tick.QuadPart / Frequency.QuadPart;
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milpart = tick.QuadPart - (sec * Frequency.QuadPart);
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return sec * 1000 + milpart * 1000 / Frequency.QuadPart;
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}
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*/
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TICKCOUNT64 wylib::time::tick64::SetTickCount64(TICKCOUNT64 llValue)
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{
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//TICKCOUNT64 lOldTick = UserSetTick;
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UserSetTick = llValue;
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return UserSetTick;
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}
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TICKCOUNT32 wylib::time::tick64::GetTickCount32()
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{
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return timeGetTime();
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}
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TICKCOUNT32 wylib::time::tick64::SetTickCount32(TICKCOUNT32 dwTick)
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{
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return (TICKCOUNT32)SetTickCount64(dwTick);
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}
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