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ttyskeepawake prevent idle system sleep when any tty (such as a remote login session) is active; a tty is inactive only when its idle time exceeds the system sleep timer, 1 to enable or 0 to disable; autopoweroff (AC power) Where supported, enabled per default as an implementation of Lot 6 to the European Energy-related Products Directive ...
A typical sleep system call takes a time value as a parameter, specifying the minimum amount of time that the process is to sleep before resuming execution. The parameter typically specifies seconds, although some operating systems provide finer resolution, such as milliseconds or microseconds.
Another native version is the timeout command which is part of current versions of Windows. [11] The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. [12] The sleep command has also been ported to the IBM i operating system. [13]
This can be achieved by passing NULL for all three fd_set arguments, and the duration of the desired sleep as the timeout argument. In the C programming language, the select system call is declared in the header file sys/select.h or unistd.h, and has the following syntax:
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Busy-waiting itself can be made much less wasteful by using a delay function (e.g., sleep()) found in most operating systems. This puts a thread to sleep for a specified time, during which the thread will waste no CPU time. If the loop is checking something simple then it will spend most of its time asleep and will waste very little CPU time.
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All of these tweaks can help set you up for a better night’s sleep later that night. Know how to wind down. You hear this one all the time, but that’s because it’s truly essential to ...