Linux sleep for milliseconds. In this tutorial, you'll learn how to add time delays to your Python programs. Using longjmp (3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results. Feb 20, 2020 · In other words, the sleep command pauses the execution of the next command for a given number of seconds. Nanosecond timing across kernel? 1. USLEEP(1) General Commands Manual USLEEP(1) NAME usleep - sleep some number of microseconds SYNOPSIS usleep [number] DESCRIPTION usleep sleeps some number of microseconds. I'm using the bash shell but I'm willing to switch to a different shell if it helps to find a command that will do the delay. The standard recommends that a steady clock is used to measure the duration. If you want to use the swimming pool in the morning all by yourself, you want the hotel manager to only wakeup if there is either something important (spurious wakeup from pthread_cond_wait) or if the hotel pool is yours (the mutex has been locked). 001 Sleep using scientific e notation. Even so, you can use this fraction with other combinations of suffixes. Feb 7, 2021 · pythonのsleep関数を使ったとき、指定した時間よりも長い間停止してしまうことはないでしょうか？sleep関数はミリ秒単位の時間で停止してくれないことがあります。この記事では、より正確に精度よくミリ秒単位で停止する方法を紹介します。 Jun 25, 2013 · @terdon I explained the difference between sleep and sleepenh in the first paragraph. The sleep command is very similar to the wait command. bobbens Function: unsigned int sleep (unsigned int seconds) ¶ Preliminary: | MT-Unsafe sig:SIGCHLD/linux | AS-Unsafe | AC-Unsafe | See POSIX Safety Concepts. I've tried "usleep" and "nanosleep", but the script doesn't recognize them. Let's see why. The sleep command can be used with the delay amount which can be specified as seconds, minutes, hours, and days. When the user issues a multiple command sequence in Linux, the commands execute immediately one after another or concurrently (e. May 28, 2024 · In this article, we will learn how to sleep a program for milliseconds in C++. For non-real-time OSs like a stock Windows, the smallest interval you can sleep for is about 10-13ms. Examples of sleep Apr 27, 2023 · @Pixelbog the syscall use is in the code (on Debian apt-get source coreutils fetch the code). Unbelievably, sleep also accepts scientific e notation. Sleep for Milliseconds in C++. This method is a pure C++ version of the sleep function from the <thread> library, and it’s the portable version for both Windows and Unix platforms. The default is 1. Aug 21, 2015 · How can I pause for 100+ milliseconds in a linux driver module? 1. sleep(seconds) # Sleeps 0. However, like nanosleep(), its actual precision is limited by the system timer resolution – typically around 15ms. Let‘s look at some examples to see it in action. May 14, 2013 · The other answers are probably sufficient in most cases but I thought I'd add my two cents as I ran into a problem on a BusyBox system. Use 'select' can get higher precision time interval for sleeping on linux or windows or other OS than 'sleep'. 0. so sleep. Compared to sleep(3) and usleep(3), nanosleep() has the following advantages: it provides a higher resolution for specifying the sleep interval; POSIX. The sleep_for() version allows you to easily specify a relative sleep duration in milliseconds, microseconds, nanoseconds, etc. 48/examples/loadables. 006. Clock must meet the Clock requirements. While it can and, in general, will take longer than the milisecond which you requested, the real sleep time should still be well below one second, or, if the system is heavily loaded, at most a couple of seconds. They accumulate over time and at some point it's noticable. For a delay of more than a second, see sleep(3), for a small delay, see nanosleep(2). You can use it for many tasks, such as waiting for an operation to QThread also provides static, platform independent sleep functions: sleep(), msleep(), and usleep() allow full second, millisecond, and microsecond resolution respectively. In practice, however, it's unlikely that you will get much more than millisecond precision with sleep because operating systems usually only support millisecond sleeps and because very short amounts of time quickly get unreliable. h>/<ctime>. I have seen accurate sleeps within several milliseconds of that time when above the minimum 10-13ms. Nov 2, 2017 · you can execute an external program with system or exec. See the nanosleep(2) man page for a discussion of the clock used. OPTIONS --usage Show short usage message. If you sleep for 2min, while putting the machine into sleep (or hibernate) for 1min, then in "human" time your script will sleep for 3min. On Linux, sleep will work on seconds; usleep will perform on microseconds and it's available on Oct 29, 2013 · A little story. 5 Ghz processor. The sleep() function provides an easy way to do this by suspending execution for a specified number of seconds. Nov 9, 2023 · #include <windows. The sleep may be lengthened slightly by any system usleep(3) - Linux man page Name. Jul 15, 2024 · While in Windows systems, it takes the time as the number of milliseconds. In other words, it ignores your computer sleeping (sorry for the pun). TheLinuxCode SLEEP(1) User Commands SLEEP(1) NAME top sleep - delay for a specified amount of time SYNOPSIS top sleep NUMBER[SUFFIX] sleep OPTION DESCRIPTION top Pause for NUMBER seconds. Sleeping will only guarantee you a minimum time - this may not matter to you depending on much granularity you need. For example, the following command will pause the script for 6 milliseconds. It takes a simple millisecond integer, avoiding the need for std::chrono durations. I did not say that others only use sleep 1 Start-Sleep [-Seconds] <Double> [<CommonParameters>] Start-Sleep -Milliseconds <Int32> [<CommonParameters>] Start-Sleep -Duration <TimeSpan> [<CommonParameters>] Description. More examples Aug 17, 2020 · Precise sleep only uses 4. sleep_until() lets you put the thread to sleep until a specific timepoint, which can be useful when coordinating events across multiple threads. May 31, 2014 · I think you'll have trouble achieving 1 ms precision with standard Linux even with constant querying in the main loop, because the kernel does not ensure your application will get CPU all the time. Jul 14, 2015 · Even if unix system or other one support nonoseconds it is limited by CPU speed. In case, sleep is an alias or a function, try replacing sleep with \sleep. Return Value. The sleep function waits for seconds seconds or until a signal is delivered, whichever happens first. sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored. Jul 21, 2009 · usleep() takes microseconds, so you will have to multiply the input by 1000 in order to sleep in milliseconds. Jul 15, 2017 · Note, that sleep has a flaw - it sleeps for actual machine time. h> Sleep(300); //Pause for 300 milliseconds. 1 Sleep for a millisecond sleep 0. 1 explicitly specifies that it does not interact with signals; and it makes the task of resuming a sleep that has been interrupted by a signal handler easier. sleep function depends on your underlying OS's sleep accuracy. h> int c_sleep_msec(long milliseconds); int c_sleep_nsec(long nanoseconds); Since the above run from a linux prompt takes five or six seconds, and Oct 30, 2023 · milliseconds = 200 seconds = milliseconds / 1000 time. So far I've looked at prstat and ps but neither give cpu time in milliseconds, both seem to have 1 second Nov 28, 2020 · sleep from GNU Core Utilities does accept decimal numbers. sleep() method with numerous annotated examples and visual diagrams. how to generate a delay. sleep Command Syntax Jul 31, 2009 · time. usleep - suspend execution for microsecond intervals Synopsis Feb 3, 2021 · Introduction. 080s sys 0m1. In this comprehensive guide, we‘ll dig deep into usleep() so you can apply it effectively in your Linux C programs. The sleep command is useful when used within a bash shell script, for example, when retrying a failed operation or inside a loop. Note: wait () and the sleep () functions should be unnecessary in general, since Qt is an event-driven framework. 5) will sleep for half a second. /foo. Why Timing Matters in Linux Programming First, let‘s […] Feb 14, 2011 · How to configure the Linux SCHED_RR soft real-time round-robin scheduler so that clock_nanosleep() can have improved sleep resolution as low as ~4 us minimum, down from ~55 us minimum, depending on your hardware Apr 22, 2014 · Using schedule_timeout does NOT sleep for a specified time but for a minimum specified time. 00 seconds") time. A sleep command is also part of ASCII's MSX-DOS2 Tools for MSX-DOS version 2. Sleep(numberOfMilliseconds); However, windows thread scheduler causes acccuracy of Sleep() to be around 15ms (so Sleep can easily wait for 20ms, even if scheduled to wait just for 1ms). h> ヘッダーで定義された POSIX 固有の関数であり、マイクロ秒数を引数として受け入れます。 sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea. This function is like a C++ version of the sleep function from the <thread> library that takes a duration as an argument and pauses the execution of May 30, 2022 · 在 Linux 系统编程中，延时函数用于控制流程、节省资源或模拟定时任务。常用的延时函数包括：sleep（秒级延时，适用于简单延时，不要求高精度）、usleep（微秒级延时，适用于需要微秒级控制的操作，但在 POSIX. Calling sleep itself will take a few milliseconds. Hi, Iam working on a project in LINUX and i require my program to go into sleep for 100ms or 200ms but sleep() takes only seconds as argumuments. Multiplying by 0. The sleep function in C returns a single value, an unsigned integer, that signifies the difference in the time the sleep was supposed to execute and the time it was returned because of external signals. May 17, 2019 · I'm trying to get my script to pause randomly between 20 and 10 seconds where the max amount of time is 20 and minimum 10. The function sleep() is also not part of standard C. Bash has a "loadable" sleep which supports fractional seconds, and eliminates overheads of an external command: $ cd bash-3. h> 头中定义的一个 POSIX 专用函数，它接受微秒数作为参数，它应该是无符号整数类型，能够容纳 [0,1000000]范围内的整数。 Simple Linux program to sleep for a number of milliseconds, instead of seconds Installation Either download the executable and copy somewhere locally, or download the C source code and compile it using Sep 28, 2021 · sleep NUMBER[SUFFIX] #Just use this command structure to wait/sleep #Example: sleep 5m #sleeps 5 minutes sleep 0. For example: In other words, try to specify the shell explicitly. In this comprehensive guide, I‘ll share my expert […] Oct 24, 2017 · #include <time. I had the design of a UNIX kernel in mind and know how to search the CONFIG_HZ option, but it may be obsolete with CONFIG_HIGH_RES_TIMERS And a time sleep 0. if you import time! print("0. Jul 1, 2021 · But what if your bash script to sleep for milliseconds? The good thing is that you can use floating point (decimal points) with sleep command. 1 #sleeps 0. I think that is the most likely explanation. sh or bash foo. Read on to master the effective use of thread sleep in Python. Anyways, I probably wasn't clear enough on that so I expanded more on that at the end. The sleep time must be multiplied by 0. 03 seconds. And please stop to shame on the programmer / write of such a Oct 25, 2023 · The number of seconds can be specified in milliseconds (a fraction of a whole second) using floating point (decimal points) with the sleep command. RETURN VALUE top The usleep () function returns 0 on success. usleep() has since been deprecated and subsequently removed from POSIX; for new code, nanosleep() is preferred: Make sure you're running your script in Bash, not /bin/sh. sleep 1e-3 Aug 24, 2011 · I want to sleep something like 10 milliseconds. You can verify this by prefixing time to the command. Sleep() only pauses the current thread, allowing others to proceed. bobbens Jun 25, 2013 · @terdon I explained the difference between sleep and sleepenh in the first paragraph. But I need to sleep ( not busy wait ) for granularity of microseconds Is there a way to code a new API in linux kernel to Jan 15, 2005 · Thanks though, sorta annoying there is no millisecond one, because the microsecond sleep will probably be less acurate, but since i don't really need too much precision, it's all good. Due to signal transmission sleep() returns the unslept quantity, a difference between the requested time to sleep() and the time it actually slept in seconds. 464s The expected result would be 1/10th of a second. sleep(0. /** * usleep_range - Sleep for an approximate time * @min: Minimum time in usecs to sleep * @max: Maximum time in usecs to sleep * * In non-atomic context where the exact wakeup time is flexible, use * usleep_range() instead of udelay(). sleep $((RANDOM)) The RANDOM will return a value between 0 and 32767 If you need to set a lower and upper limit to your sleep you need to define two other variables as follows: MINWAIT=10 MAXWAIT=30 sleep $((MINWAIT+RANDOM % (MAXWAIT-MINWAIT))) May 4, 2012 · For 1-liner on the CLI (for systems that don't have GNU's sleep: perl -MTime::HiRes=usleep -e 'usleep(1000000);'; will sleep 1s. g. Unix environments, on the other hand, offer the sleep() and usleep() functions contained in the <unistd. so. 1 seconds or 100 miliseconds #Suffixes s - seconds (default) m - minutes h - hours d - days When no suffix is specified, it defaults to seconds. Jun 18, 2019 · pause() causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function. Let‘s dive into examples, use cases and best practices for using sleep for delays down to 1/1000 of a second in your Bash scripting. 099s user 0m3. 001 seconds (millisecond). I have an accurate method for doing this on the ARM platform, but I'm not sure how to do this on the other platforms. The system in question did not support the %N format option and doesn't have no Python or Perl interpreter. I have to write a C program which has to sleep for milliseconds, which has to run on various platforms like Windows, Linux, Solaris, HP-UX, IBM AIX, Vxworks, and Windriver Linux. In this tutorial, we will show you how to use the Linux sleep command. For a better example Nov 30, 2020 · sleep 0. How to Use the sleep Command # May 26, 2019 · Im using xdotool to perform simple action like: sleep $(shuf -i 10-20 -n 1) xdotools click 1 but the after the sleep it excecutes the click always between . The program is ill-formed if std:: chrono:: is_clock_v < Clock > is false. 001 or divided by 1000 to sleep/delay the program execution in Milliseconds. Using usleep() The usleep() function takes the duration in micro seconds as input. There are two ways to use sleep: import time # Import whole time module print("0. SUFFIX may be 's' for seconds (the default), 'm' for minutes, 'h' for hours or 'd' for days. SUFFIX may be s for seconds (the default), m for minutes, h for hours or d for days. 001 also converts to the proper decimal for seconds: milliseconds = 30 seconds = milliseconds * 0. 12 of a second. Is t sleep in milliseconds. For example, you can be put to sleep for dozens of milliseconds because of preemptive multitasking and there's little you can do about it. You'll use decorators and the built-in time module to add Python sleep() calls to your code. 001 time. Oct 30, 2023 · As an experienced Linux developer, I often need to pause or delay execution in my C programs for purposes like timing, animation, user input, and avoiding resource contention. . Consider 2. This could be useful if you need to pass very small values. Mar 4, 2014 · Compared to sleep(3) and usleep(3), nanosleep() has the following advantages: it provides a higher resolution for specifying the sleep interval; POSIX. 05 seconds") The second way doesn't import the whole module, but it just sleep. I'm reading about Sleep nanosleep usleep but I'm not sure which one to use nor how to use it exactly I need to make a process sleep for a random number each '10, 20, 30, 40, 50 miliseconds'. Oct 24, 2023 · In the Windows environment, the sleep() function, housed within the <windows. For Linux, read time(7), and see also this answer. In other words, the sleep command pauses the execution of the next command for a given number of seconds. Pause for NUMBER seconds. does anyone know how to generate a millisecond delay in C, compiling under Linux? I understand the function sleep() will generate a delay down to a resolution of one second, but I need to be able to refine this to milliseconds. Apr 28, 2024 · Here, start_time=$(date +%s) and end_time=$(date +%s) capture the start and end time respectively using the date command and the +%s option. If you look at how GCC's this_thread::sleep_for() is implemented on GNU/Linux you'll see it just uses nanospleep and as Cubbi's comment says, calling that function can take around 50000ns. The sleep() function is not a standard libary function, it is defined inside the <unistd. Let us see some common examples. How may I achieve that ? I'm testing like so: Sleep(rand()%1500); But I'd like to know if it's possible to set that interval in a single line. 1 permits this); mixing calls to alarm(2) and sleep () is a bad idea. Consider the following, a 1/10,000ths of a second sleep, done 1000 times: time for i in $(seq 1 1000); do sleep 0. Oct 23, 2023 · Blocks the execution of the current thread until specified sleep_time has been reached. May 26, 2011 · I'm writing a multi-platform internal library in C++ that will eventually run on Windows, Linux, MacOS, and an ARM platform, and need a way to sleep for milliseconds at a time. $ enable -f sleep. sh. Dec 27, 2023 · Thread sleep is a critical tool for coordinating and pacing threads in Python multithreaded programming. h> for UNIX/Linux operating systems. Sep 20, 2010 · Jirka Justra's answer returns a long, which is usually 32 bits. Sep 13, 2006 · Hey everyone, I'm coming from Linux where the top command gave me lots of process info (particularly CPU time in milliseconds) and I'm trying to find similar info in Solaris. You're staying in a hotel. From sleep(1):. I did not say that others only use sleep 1 Jan 15, 2005 · Thanks though, sorta annoying there is no millisecond one, because the microsecond sleep will probably be less acurate, but since i don't really need too much precision, it's all good. 5 Sleep for one tenth of a second sleep 0. The millisecond accuracy problems is what you get when calling sleep once. 1 All Linux systems should have this version of sleep. This function may block for longer than sleep_duration due to scheduling or resource contention delays. , the tee command). 1 operation per nanosecond => even if there were support of such granulity the processor can't measure Linux command to sleep for milliseconds I keep finding myself wanting to make a command sleep for slightly more than 1 second, so I’ve finally written a quick C program which sleeps for a passed number of milliseconds – exactly the same as the normal Linux “sleep” command, but called “sleepms”. The sleep may be lengthened slightly by any system activity or by the time spent processing the call or by the granularity of system timers. If your code needs to run on BSD and other *NIXes too I would encourage you to write the script in a language like perl, python or ruby which has something like usleep(). But in Linux we can implement our own function that will take duration in milliseconds as input and sleep for that duration. The sleep, usleep, or nsleep subroutines suspend the current process until: The time interval specified by the Seconds, Useconds, or Rqtp parameter elapses. Overall, the sleep command proves essential in scripting, providing precise control over time delays and enhancing overall efficiency in Linux operations. Nov 9, 2022 · The sleep function in C takes a single parameter, an unsigned integer, that specifies the number of seconds you want the program to sleep. Aug 13, 2019 · We don’t have millisecond level control in the sleep() function. h> header, provides an alternative means to pause thread execution for a designated number of milliseconds. usleep は、<unistd. [9] Microsoft also provides a sleep resource kit tool for Windows which can be used in batch files or the command prompt to pause the execution and wait . In the main function, the first cout statements will print first, and then the sleep() function will execute and delays the execution of the process by 5 seconds and after 5 seconds, the third cout will get printed. Thanks. If sleep returns because the requested interval is over, it returns a value of zero. Oct 30, 2023 · Residential Proxies. In one second it can do about 10^8 processor commands this means about 100 operations per microsecond => it is possible handle this granulity on this processor, but 0. The usleep() function provides microsecond delay granularity that can be very useful. You want to wake up after some hours. Mar 10, 2022 · sleep. Nov 1, 2009 · @wilhelmtell: That is not the reason at all. The sleep() function in C returns 0 if the requested time has elapsed. (since C++20) The standard recommends that the clock tied to sleep_time be used, in I'm pretty sure that a single sleep like yours does not take several minutes. The accuracy of the time. The execution of a Python program can be delayed in milliseconds using two different functions that are the sleep() function of the timer module and the Timer() function of the threading module. $ make sleep && mv sleep sleep. Feb 4, 2015 · Quoted from cppreference (see sleep_for):. 08 - . Jun 22, 2021 · The sleep command delays the execution for a fixed amount of time. Oct 23, 2023 · Blocks the execution of the current thread for at least the specified sleep_duration. h> header, facilitating suspensions denoted in seconds template <class Rep, class Period> void sleep_for (const chrono::duration<Rep,Period>& rel_time); Sleep for time span Blocks execution of the calling thread during the span of time specified by rel_time . A signal is delivered to the calling process that starts a signal-catching function or end the process. Then, you'll discover how time delays work with threads, asynchronous functions, and graphical user interfaces. Feb 2, 2024 · Use nanosleep Function to Sleep in C++ This article introduces methods to sleep for milliseconds in C++. The Start-Sleep cmdlet suspends the activity in a script or session for the specified period of time. What is Thread Sleep in Python? Thread sleep […] Jan 23, 2015 · Is it possible to sleep in granularity of microseconds in linux kernel ? From what i know, there is msleep() which can sleep in milliseconds and there is udelay() which busy waits for time in microsecond granularity. Linux bash script to sleep or delay a specified amount of time examples. Feb 20, 2020 · sleep is a command-line utility that allows you to suspends the calling process for a specified time. Folks, Is there a way to sleep less then a millisecond? I tried to use usleep (1 microsecond) and nanosleep(1000 nanoseconds), but it looks like minimum time that my processe sleeps is 1 milliseconds. Oct 12, 2023 · C++ でスリープさせるには usleep 関数を使用する. If it May 16, 2011 · How do I execute a function once every 1000 milliseconds using alarm() or sleep? I want the program to do something else if the function does not execute or complete in 1000 milliseconds. Jun 18, 2019 · sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored. Sep 3, 2010 · In practice, there are few cases where you just want to sleep for a small delay (milliseconds). I am surprised that many people actually don't know why. 0001; done real 0m2. Now, it’s also interesting to look at how preciseSleep() and timerSleep() behave when they try to sleep for smaller time intervals, so I also wrote a little test for that. If you really want to block for a specified time, you will have to use locks. I'm using this atm: sleep $((10 + RANDOM % 20)); But the problem is that Jun 6, 2012 · Is it possible with macros make cross platform Sleep code? For example #ifdef LINUX #include <header_for_linux_sleep_function. Residential Proxies. Apr 8, 2014 · If you are using sleep from GNU coreutils, you can pass decimals as argument. 8%, that’s significantly lower than what I expected. However, sometimes it is necessary to postpone the execution of commands and provide enough time for the system to produce the expected results. So to convert from microseconds to milliseconds, multiply your expected milliseconds by 1000. This in-depth tutorial will provide a full understanding of the Python time. EDIT: ad The real reason to use 'select' instead of 'sleep' is the accuracy of sleep, especially the audio or video playback. I would guess some of that cost is making a system call, so switching from user-space to the kernel and back. Sleep has nowhere near the tolerances you want. Like this: sleep 0. So pause completely blocks execution of the thread until a signal is received but with sleep there is a second possibility to unblock the thread namely the seconds specified to wait for. Also using floating-point values can be specified for milliseconds. Oct 12, 2023 · 在 C++ 中使用 usleep 函数进行睡眠. From man page of sleep. Then run either by: . Then: On Linux, sleep() is implemented via nanosleep(2). May 26, 2023 · So syntax for sleep command for Unix like system is: $ sleep NUMBER Where NUMBER must be in seconds. h> #endif #ifdef WINDOWS #include < Nov 6, 2023 · Hi there! As a Linux system programmer, precise timing control is crucial for many applications. These will allow you to use the linux (not sure about windows equivalent) sleep (if loaded) which allows for decimals. Sleep 3 simulates a task causing the script to pause execution for 3 seconds. Sep 17, 2008 · Sleep function that is way less than a millisecond-maybe I found that sleep(0) worked for me. sleep Command in Linux with Examples Jan 4, 2023 · In this example, we first included the 2 header files for windows and for Linux users. - Loose waiting in C#: Thread. 2. 000 shows me that it is not with an external command you will be able to do something which is sensible. To sleep for milliseconds in C++, we can use the std::this_thread::sleep_for function. On a system with a near 0% load on the cpu in task manager, I wrote a simple console program and the sleep(0) function slept for a consistent 1-3 microseconds, which is way less than a millisecond. On Windows, the Sleep system call will work on milliseconds only. 05) # 50 milliseconds make sure you put time. Sleep asks the program to wait, and then to do the rest of the code. To sleep for 5 seconds, use: $ sleep 5 Want to sleep for 2 minutes, use: $ sleep 2m Halt or sleep for 3 hours, use: $ sleep 3h. sleep 0. So if you want to introduce a 5 milliseconds pause, use it like this: Dec 27, 2023 · The built-in sleep command in Bash provides an easy way to pause scripts with millisecond granularity when needed. The number of milliseconds since unix time 0 in 1970 requires more bits, so the data type should be long long or unsigned long long, which is usually 64 bits. Use std::this_thread::sleep_for Method to Sleep in C++. usleep 是在 <unistd. 2 seconds. [8] In PowerShell, sleep is a predefined command alias for the Start-Sleep cmdlet which serves the same purpose. Sep 18, 2008 · for 1. Jul 19, 2024 · The Bash ` Sleep` Command serves as a pause button, enabling computers to wait for a specified duration before proceeding to the next task in a script. And timer sleep also basically uses 0% of the CPU, which is great. There is no way to do so in standard C, the topic of this newsgroup. Aug 7, 2024 · Other CPU operations will function adequately but the sleep() function in C++ will sleep the present executable for the specified time by the thread. On some systems, sleep () may be implemented using alarm(2) and SIGALRM (POSIX. In the example, here below, we tell sleep to pause for 0. Who is it making this supposition other than yourself? There is no standard for thread support (yest), and if there are no threads (or rather only one thread), there is no need for a thread sleep rather than a simple 'busy-wait', which can be implemented with <time. 1-2008 中已废弃）、nanosleep（纳秒级延时，高精度需求，如实时系统，且具有良好可移植 Compared to sleep(3) and usleep(3), nanosleep() has the following advantages: it provides a higher resolution for specifying the sleep interval; POSIX. The process is notified of an event through an event notification function. ympy knwbm vbdist avcpwu ubcd csm tnik nog ffrra eobt