C++ thread sleep interrupt

In a previous post, I measured the time necessary to start a thread, execute a small job and return. The answer is thousands of nanoseconds.

Pausing and interrupting threads

Importantly, that is the time as measured by the main thread. That is, sending the query, and getting back the result, takes thousands of nanoseconds and thousands of cycles. The work in my case is just incrementing a counter: any task more involved will increase the overall cost. Creating a new thread each time is fine if you have a large task that needs to run for milliseconds.

What else could you do?

c++ thread sleep interrupt

Instead of creating a thread each time, you could create a single thread. This thread loops and periodically sleep, waiting to be notified that there is work to be done.

It should be faster and overall more efficient. You should expect gains ranging from 2x to 5x. However, the operating system is in charge of waking up the thread and may not do so immediately so it is not likely to be the fastest approach.

You could simply avoid as much as possible system dependencies and just loop on an atomic variable. The downside of the tight loop lockspin approach is that your thread might fully use the processor while it waits. However, you should expect it to get to work much quicker. The results will depend crucially on your processor and on your operation system. My source code is available.

View all posts by Daniel Lemire. For me it looks like been decided, this one is a software issue to resolute or to live with, yet those CPU technologies do evolve to hasten specific software problems, may be it is hard or wrong to do in hardware, may be, on other hand seeing what was considered to be hard or impossible 15 or 20 years ago or even morein a device you can hold in one hand does means one thing, that hard and impossible are relative matter and not absolute.

Is it wrong to begin with? It is very application dependent. In Intel processors you already got something like that. The instructions monitor and mwait track a memory location and put the core in a low power state.

The problem is that it is processor specific and not portable to other platforms. Cherry on top, RTIC extracts information about which resources are used by each task, to both avoid unnecessary locks if a task uses a given shared resource, but no higher-priority task does, it can safely avoid taking-and-releasing the lock and avoid unnecessarily blocking when a task A is in a critical section, only tasks which use some of the same resources are blocked; higher-priority tasks that do not interact with A can still preempt it as needed.

The Cherry you mentioned, IMHO it makes sense to be used to simplify the multi-reader single-writer implementation may be for multi-writer in atomic behaviour! Why implement your own 1-thread thread pool? Just use an existing library. DuckDuckGo Search. In our case, since the operating system closes a thread down in its own time, we quickly ran out of threads using the first approach. Re-using the thread was the only workable solution. It is intriguing. Did you join your threads and still get the problem?

I am hoping that once the call to join succeeds, the thread is gone. The spinlock approach is something that should be avoided by any means. Especially on single core machines this will effectvely kill the performance of the whole system. I would never ever do that!

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The sleep function suspends execution of the calling thread until either seconds seconds have elapsed or a signal is delivered to the thread and its action is to invoke a signal-catching function or to terminate the thread or process. System activity may lengthen the sleep by an indeterminate amount. So, if a signal is send to the application, its execution is resumed from the instruction after the sleep call.

Learn more. Interrupt sleep function Ask Question. Asked 10 years, 6 months ago. Active 5 years, 4 months ago. Viewed 8k times. How can I interrupt sleep using a signal handler? Improve this question. Very fitting for the question. Active Oldest Votes. From sleep function man page: The sleep function suspends execution of the calling thread until either seconds seconds have elapsed or a signal is delivered to the thread and its action is to invoke a signal-catching function or to terminate the thread or process.

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Iharob Al Asimi And by sending a signal, it means using alarm? See also signal 7. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta. Linked 1. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.Interrupting a Thread: If any thread is in sleeping or waiting state i.

If the thread is not in the sleeping or waiting state, calling the interrupt method performs normal behaviour and doesn't interrupt the thread but sets the interrupt flag to true.

Let's first see the methods provided by the Thread class for thread interruption. The 3 methods provided by the Thread class for interrupting a thread public void interrupt public static boolean interrupted public boolean isInterrupted Example of interrupting a thread that stops working In this example, after interrupting the thread, we are propagating it, so it will stop working. If we don't want to stop the thread, we can handle it where sleep or wait method is invoked.

Let's first see the example where we are propagating the exception. Output:Exception in thread-0 java. RuntimeException: Thread interrupted InterruptedException: sleep interrupted at A. Output:Exception handled java. InterruptedException: sleep interrupted thread is running Output:Code for interrupted thread code for normal thread code for normal thread code for normal thread.

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Deadlock in Java. Inter-thread Comm. Interrupting Thread. Reentrant Monitor.The exception that is thrown when a Thread is interrupted while it is in a waiting state. The following code example shows the behavior of a running thread when it is interrupted and subsequently gets blocked.

After a thread is created, it is in one or more ThreadState states until it is destroyed. Calling Interrupt when a thread is in the WaitSleepJoin state will cause a ThreadInterruptedException to be thrown in the target thread.

If the thread is not in the WaitSleepJoin state, the exception is not thrown until the thread enters that state. If the thread never blocks, it could complete without ever being interrupted.

For a list of initial property values for an instance of ThreadInterruptedExceptionsee the ThreadInterruptedException constructors. Initializes a new instance of the ThreadInterruptedException class with default properties. Initializes a new instance of the ThreadInterruptedException class with serialized data. Initializes a new instance of the ThreadInterruptedException class with a specified error message. Initializes a new instance of the ThreadInterruptedException class with a specified error message and a reference to the inner exception that is the cause of this exception.

Gets the Exception instance that caused the current exception. When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. When overridden in a derived class, sets the SerializationInfo with information about the exception. Creates a shallow copy of the current Object. Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

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Output:Exception in thread-0 java. RuntimeException: Thread interrupted InterruptedException: sleep interrupted at A. Output:Exception handled java.

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InterruptedException: sleep interrupted thread is running Output:Code for interrupted thread code for normal thread code for normal thread code for normal thread. Next Topic Reentrant Monitor in Java. Verbal A. Angular 7. Compiler D. Software E. Web Tech. Cyber Sec. Control S. Data Mining. Javatpoint Services JavaTpoint offers too many high quality services. If the thread is not in the sleeping or waiting state, calling the interrupt method performs normal behaviour and doesn't interrupt the thread but sets the interrupt flag to true.

Let's first see the methods provided by the Thread class for thread interruption. In this example, after interrupting the thread, we are propagating it, so it will stop working. If we don't want to stop the thread, we can handle it where sleep or wait method is invoked. Let's first see the example where we are propagating the exception.

In this example, after interrupting the thread, we handle the exception, so it will break out the sleeping but will not stop working. If thread is not in sleeping or waiting state, calling the interrupt method sets the interrupted flag to true that can be used to stop the thread by the java programmer later. The isInterrupted method returns the interrupted flag either true or false.

The static interrupted method returns the interrupted flag afterthat it sets the flag to false if it is true.We will also learn about the other functions viz. The execution is suspended, for this period of time. The execution will be resumed back when the time interval of sleep expires or a signal or interrupt causes the execution to resume.

To put a program task, process or thread to sleep we make use of a sleep system call. A typical sleep system call takes the time as the parameter that indicates how much time the program needs to sleep or remain inactive. We also have usleep and thread:: sleep functions which we will discuss in this tutorial.

The time provided is mostly in milliseconds, microseconds or seconds and depending on that we have various functions that can put the program to sleep. So in order to write a cross-platform program, we can have the code as shown below so that either of the headers will be used. If sleep is interrupted by a signal then an unslept amount requested time period specified minus the actual time elapsed is returned.

The sleep function causes the program or the process in which it is called, to suspend its execution temporarily for a period of time in seconds specified by the function parameter. Execution is suspended until the requested time is elapsed or a signal or an interrupt is delivered to the function.

Note: Readers should execute this program to actually understand the working of the sleep command. The working is similar to sleep function described already.

The function usleep suspends the execution of calling thread for useconds microseconds or until the signal is delivered to the thread that interrupts the execution. The granularity of the timer values used in the usleep function may be implementation-specific. If we need finer granularity than the one specified by the implementation, then the actual timer value is rounded up to the next supported value. Given below is an example to demonstrate the usleep function. This function may block for a longer duration than a specified time due to scheduling activities or resource contention delays.

In the above program, we have a specified sleep duration of milliseconds. This means that the thread will block for milliseconds before resuming the operation. Like the other functions, this function may also block for a longer duration than a specified time due to scheduling activities or resource contention delays. In this program, we make the thread sleep for 60 seconds i.

Once 1 minute is complete; thread wakes up and prints the current time. Answer: Sleep function suspends the execution of the program for a specified period of time. This time period is specified as an argument to the sleep function. Q 3 What is the use of include Unistd H? Sleep and usleep functions are same except for the time unit used to specify the sleep time.

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In sleep function, the time is specified in seconds, while in usleep function, the time is specified in microseconds. All the sleep functions discussed may take a longer time to return depending on scheduling or other resource-specific delays. Last Updated: January 18, The most common ways to synchronize the activities of threads are to block and release threads, or to lock objects or regions of code.

For more information on these locking and blocking mechanisms, see Overview of Synchronization Primitives. You can also have threads put themselves to sleep. When threads are blocked or sleeping, you can use a ThreadInterruptedException to break them out of their wait states. Calling the Thread. Sleep method causes the current thread to immediately block for the number of milliseconds or the time interval you pass to the method, and yields the remainder of its time slice to another thread.

Once that interval elapses, the sleeping thread resumes execution. One thread cannot call Thread. Sleep on another thread. Sleep is a static method that always causes the current thread to sleep. Calling Thread. Sleep with a value of Timeout.

c++ thread sleep interrupt

Infinite causes a thread to sleep until it is interrupted by another thread that calls the Thread. Interrupt method on the sleeping thread, or until it is terminated by a call to its Thread. Abort method. The following example illustrates both methods of interrupting a sleeping thread. You can interrupt a waiting thread by calling the Thread. Interrupt method on the blocked thread to throw a ThreadInterruptedExceptionwhich breaks the thread out of the blocking call.

The thread should catch the ThreadInterruptedException and do whatever is appropriate to continue working. If the thread ignores the exception, the runtime catches the exception and stops the thread. If the target thread is not blocked when Thread. Interrupt is called, the thread is not interrupted until it blocks. If the thread never blocks, it could complete without ever being interrupted.

If a wait is a managed wait, then Thread.

c++ thread sleep interrupt

Interrupt and Thread. Abort both wake the thread immediately. If a wait is an unmanaged wait for example, a platform invoke call to the Win32 WaitForSingleObject functionneither Thread. Interrupt nor Thread. Abort can take control of the thread until it returns to or calls into managed code.

In managed code, the behavior is as follows:. Interrupt wakes a thread out of any wait it might be in and causes a ThreadInterruptedException to be thrown in the destination thread. Abort wakes a thread out of any wait it might be in and causes a ThreadAbortException to be thrown on the thread.


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