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54 lines
2.1 KiB
C++
54 lines
2.1 KiB
C++
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#ifndef NU_THREADPOOL_TIMERHANDLE_H
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#define NU_THREADPOOL_TIMERHANDLE_H
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#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x400)
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#error Must define _WIN32_WINNT >= 0x400 to use TimerHandle
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#endif
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#include <windows.h>
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#include <bfc/platform/types.h>
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/*
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TimerHandle() constructor will make a new timer handle
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TimerHandle(existing_handle) will "take over" an existing handle
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~TimerHandle() DOES NOT CloseHandle as this object is meant as a helper
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call Close() to kill the timer handle
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The timer will be "one shot" auto-reset.
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Because it is meant to be compatible with the threadpool, manual-reset timers and periodic timers
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are not recommended!! You will have re-entrancy problems
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If you want "periodic" behavior, call Wait() at the end of your ThreadPoolFunc
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*/
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class TimerHandle
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{
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public:
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TimerHandle() { timerHandle = CreateWaitableTimer( 0, FALSE, 0 ); }
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TimerHandle( HANDLE p_handle ) { timerHandle = p_handle; }
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void Close() { CloseHandle( timerHandle ); }
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void Wait( uint64_t p_milliseconds )
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{
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/* MSDN notes about SetWaitableTimer: 100 nanosecond resolution, Negative values indicate relative time*/
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LARGE_INTEGER timeout = { 0 };
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timeout.QuadPart = -( (int64_t)p_milliseconds * 1000LL /*to microseconds*/ * 10LL /* to 100 nanoseconds */ );
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SetWaitableTimer( timerHandle, &timeout, 0, 0, 0, FALSE );
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}
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void Poll( uint64_t p_milliseconds ) // only use on a reserved thread!!!
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{
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/* MSDN notes about SetWaitableTimer: 100 nanosecond resolution, Negative values indicate relative time*/
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LARGE_INTEGER timeout = { 0 };
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timeout.QuadPart = -( (int64_t)p_milliseconds * 1000LL /*to microseconds*/ * 10LL /* to 100 nanoseconds */ );
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SetWaitableTimer( timerHandle, &timeout, (LONG)p_milliseconds, 0, 0, FALSE );
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}
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/* TODO: WaitUntil method for absolute times */
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void Cancel() { CancelWaitableTimer( timerHandle ); }
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operator HANDLE() { return timerHandle; }
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private:
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HANDLE timerHandle;
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};
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#endif // !NU_THREADPOOL_TIMERHANDLE_H
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