![]() For more information about the relationship between system clock resolution and timer accuracy, see Timer Accuracy. If a driver specifies a relative expiration time for a high-resolution timer, the timer can expire as late as about a millisecond after the specified expiration time but it never expires early. If a driver specifies a relative expiration time for a default-resolution timer, the timer can expire up to about 15 milliseconds earlier or later than the specified expiration time. Thus, the expiration time of a default-resolution timer (which ExAllocateTimer creates if the EX_TIMER_HIGH_RESOLUTION flag is not set) can be controlled only to within about 15 milliseconds, but the expiration time of a high-resolution timer can be controlled to within a millisecond. Controlling timer accuracyįor example, for Windows running on an x86 processor, the default interval between system clock ticks is typically about 15 milliseconds, and the minimum interval between system clock ticks is about 1 millisecond. This member is a part of the structure starting with Windows 8.1 and KMDF version 1.13. To create a high-resolution timer, the driver sets the UseHighResolutionTimer member of this structure to TRUE. In this call, the driver passes a pointer to a WDF_TIMER_CONFIG structure as a parameter. ![]() When the driver calls the ExSetTimer routine to set the high-resolution timer, the operating system increases the resolution of the system clock, as necessary, so that the times at which the timer expires more precisely correspond to the nominal expiration times specified in the DueTime and Period parameters.Ī Kernel-Mode Driver Framework (KMDF) driver can call the WdfTimerCreate method to create a high-resolution timer. To create a high-resolution timer, a WDM driver calls the ExAllocateTimer routine and sets the EX_TIMER_HIGH_RESOLUTION flag in the Attributes parameter. Thus, drivers should use high-resolution timers only when timer accuracy is essential, and use default-resolution timers in all other cases. However, high-resolution timers require system clock interrupts to-at least, temporarily-occur at a higher rate, which tends to increase power consumption. In contrast, timers that are limited to the default system clock resolution are significantly less accurate. The accuracy of a high-resolution timer is limited only by the maximum supported resolution of the system clock. Just extract it to any folder where you want to store it and run FreeCountdownTimer.exe in order to launch the program.ĭo you need more information? Take a look at the help page: Online Help.Starting with Windows 8.1, drivers can use the Ex XxxTimer routines to manage high-resolution timers. In this way, all your timers will always be with you the settings will be stored in the file Data.ini. You can put Free Countdown Timer on a flash drive and run it directly from there.The timer will automatically turn up the volume if you have it on mute by accident and set a predefined volume level.The timer wakes up your system from Sleep mode.Free Countdown Timer offers a number of convenience features Free Countdown Timer comes with several sounds and offers full access to your music library. You can select the sound you want for a timer. Here are some ideas for a countdown clock:Īfter you set the time, date, and sound for each timer, you can use a text field to write a note to yourself as a reminder about the timer's purpose.įree Countdown Timer can play music files What holiday is coming up? Never forget a holiday anymore with a free countdown timer. The timer reminds you about the event by playing your favorite music and showing a notification message. You can fully concentrate on the task at hand while waiting for a future task to be ready for action. The countdown timer tracks the amount of time till the specified event. This program allows you to set as many countdown timers as you want. Free Countdown Timer A free, full-featured, and lightweight countdown timer for Windowsįree Countdown Timer is freeware.
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