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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.
A timeout can also be specified on the wait using the wait_for() or wait_until() member functions to avoid indefinite blocking. If the future arose from a call to std::async then a blocking wait (without a timeout) may cause synchronous invocation of the function to compute the result on the waiting thread.
An uninterruptible sleep state is a sleep state that will not handle a signal right away. It will wake only as a result of a waited-upon resource becoming available or after a time-out occurs during that wait (if specified when put to sleep). It is mostly used by device drivers waiting for disk or network IO (input/output).
In a seminal paper published in AFIPS 1970, [4] Norman Abramson presented the idea of multiple “users,” on different islands, sharing a single radio channel (i.e., a single frequency) to access the main computer at the University of Hawaii without any time synchronization. Packet collisions at the receiver of the main computer are treated ...
In the Solaris implementation of condition variables, a spurious wakeup may occur without the condition being assigned if the process is signaled; the wait system call aborts and returns EINTR. [2] The Linux p-thread implementation of condition variables guarantees that it will not do that. [3] [4]
“There has been so much focus on couples sleeping apart but it was sort of missing the other part of the story about why many couples do prefer to sleep together and why there tends to be this ...
Yes, you should wait for the price of gold to fall to invest If you want to maximize profits and are willing to wait it out, price-watch, and sell your gold off once prices rise again, then ...
They need to be Vidalia onions, because these Georgia-grown onions are naturally sweet without being pungent or over-the-top. The farmers who grow Vidalia onions—in Vidalia, ...