C Nanosleep Examples

4/1 has an example where an 'extern "C"' function declaration in two different namespaces refer to the same function (as one would expect). Format method. On POSIX, for example, it is small # wrapper around pthread_create. tv_nsec = milisec * 1000000L; nanosleep(&req, (struct timespec *)NULL); For ease of use, this could easily be wrapped into a function. What function you suggest I use to get the best resolution to do a short sleep of few micro seconds. So you recommend to use the parameter -lwinpthread for g++ to be 100% sure I'm using winpthreads?. First of all, I should say that you cannot guarantee user-mode processes to have exact control of timing because of the multi-tasking nature of Linux. > to pause for 10 seconds, for example; this does not work for > fractions of a second, which is the original question. Searchable Linux Syscall Table for x86 and x86_64. ) tjm: It is difficult to efficiently fix this, other than leaking old keys. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. The type of the second variable of nanosleep structure is long. The OS can decide to run some other task during that time, and the delay could easily be several milliseconds before your program can resume. A short sample C program using nanosleep and getrusage. Return Values. This function may block for longer than sleep_duration due to scheduling or resource contention delays. 1c standard. 6系で入った関数ですが、nanosleep(3)と精度が同じならば何故あるのか? が疑問になります。 その答えは、manにあります。 int clock_nanosleep(clockid_t clock_id. timespec - 2 examples found. net programming examples pdf c programming examples on operators c programming examples on loops. I suspect that there will still be problems with any function such as nanosleep. * The following is an example of writing data to and reading it from a * M24C16 I2C EEPROM. The nanosleep function is declared. explain_message_nanosleep void explain_message_nanosleep(char *message, int message_size, const struct timespec *req, struct timespec *rem);. Asynchronous IO. Jump to: navigation, search. Some systems want this, others do not. html and R&R. I think the code below is mostly portable. 최근 글들 Recent post • Spring boot erro. To have a maximum guarantee you need to use an OS that explicitly supports it. The problem with wall-clock time is that it can jump all over the place. Detailed Description. In fact there is a quite short list of function you can safely call from a signal handler in signal(7). To avoid this calls to nanosleep should be protected using cancellation handlers. The parameter typically specifies seconds, although some operating systems provide finer resolution, such as milliseconds or microseconds. the GNU C compiler, gcc being a standard. That is for example on my machine I updated the blink-io. Session 16: Debugging and Profiling Parallel Programs. Your process might be scheduled out at any time for anything from about 10 milliseconds to a few seconds (on a system with very high load). This also handles restarting nanosleep with the remaining time in the event that nanosleep is interrupted by a signal. # PyThread_start_new_thread - Python's C function function to create # On POSIX, for example, Python uses sem_init(process-private) + sem_post/sem_wait. It provides access to GPIO and other IO functions on the Broadcom BCM 2835 chip, as used in the RaspberryPi, allowing access to the GPIO pins on the 26 pin IDE plug on the RPi board so you can control and interface with various external devices. As far as I understand, I have to give an absolute time as input. The example demonstrates concepts using multiple signals to distinguish between timer expirations. We will start from a simple userspace C program and see all way from the call of the standard library function to the implementation of certain system calls. zx_nanosleep() suspends the calling thread execution until deadline passes on ZX_CLOCK_MONOTONIC. Anyways this led me to look for nanosleep and compiling problems and I then found out that when compiling a c program with nanosleep in it you have to compile with -lrt. The platform is QT4. I've tried usleep and nanosleep but regadless of values they both last at least 100us! - measured using gettimeofday before and after. The nanosleep() function shall cause the current thread to be suspended from execution until either the time interval specified by the rqtp argument has elapsed or a signal is delivered to the calling thread, and its action is to invoke a signal-catching function or to terminate the process. EINVAL The rqtp argument specified a nanosecond value less than zero or greater than or equal to 1000 million. A thread is a single sequence stream within in a process. nanosleep() is implemented using an interruptible wait function, and does not use signals. sourceforge. On Unix system signals interrupt system calls, including sleep(). note :- even though i have defined one more alias for the previously defined alias it will not overwrite insted both will work. Javascript is not enabled. That means that a call to nanosleep with a parameter equal to one nanosecond will take more time to make the call and return from it than the delay calls for. Miller, and M. Return Value. nanosleep() is only guarenteed to sleep for *at least* the amount of time you specify. gettimeofday() and time() should only be used to get the current time if the current wall-clock time is actually what you want. The weird thing is that when i compiled the c-code, it compiled just fine, and the problem only showed when trying to run the java program. Multiprocess and Shared Memory. Hence there are no interactions with SIGALRM handling, or with any other wait function (for example, sleep()), as there are on some UNIX platforms. Christophe Blaess, Author of Programmation systeme en C sous Linux". The platform is QT4. CheckSymbolExists¶ Check if a symbol exists as a function, variable, or macro. そうしたら次は, Documentation/rtc. Both of these assume you execute the commands from the same directory as the program. System Calls in Unix and Windows Vivek Vishnumurthy 2 Purpose of this Lecture To familiarize you with using system calls - especially the ones to do with accessing and manipulating files. RT Preempt is a popular patch for the Linux kernel to transform Linux into such a realtime operating system. txt file in /tools, and a man page in /man/man8. You can rate examples to help us improve the quality of examples. It uses fclose to close the first file and _fcloseall to close all remaining files. The C/C++ implementation for pause in the generated code differs depending on the hardware settings stored in the code generation configuration object. orbslam C++ error:Sleep was not declared in this scope usleep was not declared in this scope usleep 3000); (4) I am using C++ in Ubuntu with codeBlocks, boost 1. This manual page is part of the POSIX Programmer's Manual. Use the new POSIX unlink semantics on NTFS starting with Windows 10 1709. The parameter typically specifies seconds, although some operating systems provide finer resolution, such as milliseconds or microseconds. Using and Understanding the Real-Time Cyclictest Benchmark Cyclictest results are the most frequently cited real-time Linux metric. c:20 [email protected] (since C++11) Blocks the execution of the current thread for at least the specified sleep_duration. 0), drones, etc. Basic idea is to get current clock and add the required delay to that clock, till current clock is less then required clock run an empty loop. The example demonstrates concepts using multiple signals to distinguish between timer expirations. Is the following code okay in this case?. nanosleep() suspends the execution of the calling thread until either at least the time specified in *req has elapsed this means that your timer will least at least time specified, but it could take longer to invoke the timer signal. Putting a C-oriented header in a namespace /can/ work when the functions are 'extern "C"'. Note that this is currently not available with release builds on Windows. * from this software without specific prior written permission. c // compile with: /W3 // This program opens two files. At the end of each nanosleep syscall the script prints out a line with a timestamp in microseconds, the pid, the executable name in parentheses, the "nanosleep:" key, and the duration of the sleep in microseconds. Classic C language reference by Brian Kernighan and Dennis Ritchie, The C Programming Language (2nd Edition), Prentice-Hall (1988) Classic C function reference by Donald Lewine, POSIX Programmer's Guide: Writing Portable UNIX Programs O'Reilly and Associates, Inc (1991). this silly little test program demonstrates a bug in the interaction between GNU gdb 4. It's like a giant storage chest where you can store one large item, or a small item, but never the both at the same time. The platform is QT4. Thread design, so the use of this function in a POSIX thread result in undefined behavior of any Boost. However, it fails to mention that if you use multiple timers with a single signal then you need have a single signal handler that can identify which timer just went off and pass control to the timer-specific handler. /* * shared-mem-with-semaphore. , most busybox commands) to override //real commands on the filesystem. See the EXAMPLES section below and the test scripts for usage; see your system documentation for the description of the underlying nanosleep or usleep, ualarm, gettimeofday, and setitimer/getitimer calls. Visual C++ Team. id != host and proc. producer consumer problem is. The first is the path to the file to check. Ask Question the blinking example seems to work just fine. Sleep often leads to poor code design and the wait or nanosleep functions are preferable. 4/1 has an example where an 'extern "C"' function declaration in two different namespaces refer to the same function (as one would expect). What function you suggest I use to get the best resolution to do a short sleep of few micro seconds. On Mac OS X, for example, pthread_exit unwinds without calling C++ destructors. PORTING ISSUES. For example, you might schedule something to sleep for 1. Overcoming Distributed Debugging Challenges in the MPI+OpenMP Programming Model Lai Wei, Ignacio Laguna, Dong H. The first place I looked was kern/kern_time. In the following example we also use read() and write() system calls to copy from one file descriptor to the other (both descriptors returned by open() system call) so it is wise to open their man pages as well (man 2 read and man 2 write). txt file in /tools, and a man page in /man/man8. If a program that catches signals and uses nanosleep() receives signals at a very high rate, then scheduling delays and rounding errors in the kernel's calculation of the sleep interval and the returned remain value mean that the remain value may steadily increase on successive restarts of the nanosleep() call. So here's the example code for program that copies input file passed as first argument into output file. @ixnisarg, the usleep is an example, but the consumer has to be faster than the publisher. c, this is what I see if I build and run the code on a macOS machine: ~ $ clang -std=c17 -Wall -Wextra -pedantic time_utils. Like nanosleep(2), clock_nanosleep() allows the calling thread to sleep for an interval specified with nanosecond precision. But strange is compiling parameters it has joined the -D_GLIBCXX_USE_NANOSLEEP Posted by Spark at March 11, 2016 - 9:11 PM I used mingw4. strtok_r() The strtok_r() function considers the null-terminated string s1 as a sequence of zero or more text tokens separated by spans of one or more characters from the separator string s2. timespec extracted from open source projects. nanosleep() suspends the execution of the calling thread until either at least the time specified in *req has elapsed, or the delivery of a signal that triggers the invocation of a handler in the calling thread or that terminates the process. These are the top rated real world C# (CSharp) examples of Interop. See Example 1, 2, and 3 in the EXAMPLES section for examples of strtok() usage and the explanation in NOTES. I think the code below is mostly portable. For instance, to measure on CPU0, CPU2 and CPU3: perf stat -B -e cycles:u,instructions:u -a -C 0,2-3 sleep 5 The demonstration machine has only two CPUs, but we can limit to CPU 1. * from this software without specific prior written permission. Nearly every aspect of the UNIX operating system is described in online documentation called "manual pages". Interactive Adventures is now out. The following code will […]. These are the top rated real world C++ (Cpp) examples of statvfs extracted from open source projects. The C/C++ implementation for pause in the generated code differs depending on the hardware settings stored in the code generation configuration object. hi i want to make use of nanosleep(), such that if my nanosleep is interrupted by a signal, i want to resume the sleep where it had left. $ gcc -o nanosleep nanosleep. Please enable Javascript to access this website. The nanosleep() function causes the calling thread to be suspended from execution until either: The time interval specified by the rqtp argument has elapsed Or A signal is delivered to the thread, and the signal's action is to invoke a signal-catching function or terminate the process. core: coredumpctl -o myapp. The most practical way is to copy the source code for the necessary functions to your own source code and to adapt your include files and Makefiles. com OAR Corporation Huntsville Alabama USA December 2016. However, a closer examination shows a bug in tvtohz() (kern/kern_clock. Unions are like structures except that all the variables share the same memory. clock_setres is a no-op now. Can someone give me the example of the simplest usage of nanosleep in C? Please explain in the comment '/* */'. 进程收到abort信号后crash了,用lldb分析core文件得到貌似是因为析构时多次释放内存引起的,我对lldb不熟悉,bt输出来的信息定位到protobuf源码去了,不知道如何分析。. The sleep command pauses for an amount of time defined by NUMBER. To have a maximum guarantee you need to use an OS that explicitly supports it. Anyways this led me to look for nanosleep and compiling problems and I then found out that when compiling a c program with nanosleep in it you have to compile with -lrt. Also try the Keil examples. h files with the various configuration data structures and constants. c:17 [email protected] Check again the info threads to find out the thread which has locked the mutex. That means that a call to nanosleep with a parameter equal to one nanosecond will take more time to make the call and return from it than the delay calls for. Hi @ll I have a problem with my code but first a short description: 1. Could anybody tell me what's wrong. Then, free-ing such small zones is adding the free-d zone to that linked list. deadline will be automatically adjusted according to the job's [timer slack] policy. A signal can report some exceptional behavior within the program (such as division by zero), or a signal can report some asynchronous event outside the program (such as someone striking an interactive attention key on a keyboard. 1 Generator usage only permitted with license. The "C Resolution" column is the resolution of the underlying C structure. For example, the following command can be run to extract core dump related to process with pid 22739 into file myapp. The nanosleep system call is a high-precision version of the standard UNIX sleep call. Second try: main loop with clock_nanosleep() calls (stepper1. producer consumer problem is. 501(c)3 nonprofit corporation. h doesn't exist. nanosleep() - Unix, Linux System Calls Manual Pages (Manpages) , Learning fundamentals of UNIX in simple and easy steps : A beginner's tutorial containing complete knowledge of Unix Korn and Bourne Shell and Programming, Utilities, File System, Directories, Memory Management, Special Variables, vi editor, Processes. The Linux man-pages project documents the Linux kernel and C library interfaces that are employed by user-space programs. clock_setres is a no-op now. The suspension time may be longer than requested. However, it fails to mention that if you use multiple timers with a single signal then you need have a single signal handler that can identify which timer just went off and pass control to the timer-specific handler. When writing code that is platform- specific, or compiler-specific, be sure you check the appropriate #define! Example 1: Misuse of #ifdef _WIN32. The C interface is better (see other examples in samples/bpf), but it's still laborious and difficult to use. Second try: main loop with clock_nanosleep() calls (stepper1. Hi all, I am writing a small program where I need to sleep for a small amount of time (50 milliseconds), but one of the requirements is that it must compile cleanly (no warnings) with -std=c99. This example project allows you to pipe in data separated by newlines, or you can. A more complicated possible solution is to migrate the Time classes to the new C++11 functions, that seem to work fine also on WSL (even if I imagine that they are internally implemented using the clock_nanosleep system calls. attachment. The problem occurs when concurrently producer and consumer tries to fill the data and pick the data when it is full or empty. 1 seconds if the thread isn't scheduled again due to, say, exceptionally heavy load. Key Takeaways. You can turn this feature on from Tools->Options->Text Editor->C/C++->Formatting-> Miscellaneous->Enumerate Comment Tasks. nanosleep syscall. Gdb is run from the shell with the command ‘gdb’ with the program name as a parameter, for example ‘gdb eg’, or you can use the file command once inside gdb to load a program for debugging, for example ‘file eg’. A conforming ANSI C implementation is not allowed to throw in non-ANSI identifiers like ``nanosleep'' into a standard header (unless they are confined into a reserved namespace, e. Demonstrations of functrace, the Linux ftrace version. We apologize for the inconvenience. 한 이후에 깨어나는 수 밖에는 없어서 그렇습니다. The problem occurs when concurrently producer and consumer tries to fill the data and pick the data when it is full or empty. I am working on my Final Project and I need to use the nanosleep function which suspends my program for a specified number of seconds. Key Takeaways. The program loops continuously until the program is terminated by a Ctrl/C from the user. #include. Use of LibGw32c as a separate development library is very complicated. Mind this article is meant for beginners in this field. orbslam C++ error:Sleep was not declared in this scope usleep was not declared in this scope usleep 3000); (4) I am using C++ in Ubuntu with codeBlocks, boost 1. Gzip attempts to truncate only the parts of the file name longer than 3 characters. nanosleep(&timeout, &remaining_time); It is sometimes useful for a thread to wait for a certain period of time before continuing. c -o nanosleep_demo ~ $. The core concept of Cyclictest is very simple. Compiler options from "Hello World Small" sample project reproduce the issue. core dump 22739 Once the core file has been extracted from the journal, send it to us along with the application executable so we can fix the crash and distribute a fix. In this example, the statement body is executed while i is greater than 0. Attach using ptrace() to process while it's in a syscall which use. After a lot of investigation into freezing downloads and failed reboots I have narrowed the problem down to a repeatable example:. * The following is an example of writing data to and reading it from a * M24C16 I2C EEPROM. com //Date : 17 June 2013. nanosleep(&timeout, &remaining_time); It is sometimes useful for a thread to wait for a certain period of time before continuing. I think the code below is mostly portable. 24, ARM AT91SAM9263-ARM9-240MHz. Ask Question the blinking example seems to work just fine. The nanosleep function is declared. RTEMS State of the World Joel Sherrill, Ph. Example/SysConfig Updates. Sleep often leads to poor code design and the wait or nanosleep functions are preferable. The C/C++ implementation for pause in the generated code differs depending on the hardware settings stored in the code generation configuration object. The strtol function skips all white-space characters at the beginning of the string, converts the subsequent characters as part of the number, and then stops when it encounters the first character that isn't a number. Working with Video Using OpenCV and QT Video processing is a very important task in computer vision applications. /* * COPYRIGHT (c) 1989-1999. 24, ARM AT91SAM9263-ARM9-240MHz. In a multi-threading environment, sometimes we don't want to run some threads. The choice OPTION=yes checks for the availability of the facilities in libc and libposix4. vxworks rough idling Computers are kind of fast these days, which means a lot of little inefficiencies vanish from sight. ) If the name consists of small parts only, the longest parts are truncated. You will surprised to find out that process does open all sort of files. net: POSIX timers - cpwiki I would presume that all OS's have some equivalent to nanosleep and/or ntp_gettime. それ以外の場合、実装は POSIX API nanosleep を使用します。POSIX API を使用するコードをコンパイルする場合、プリプロセッサ マクロ _POSIX_C_SOURCE を 199309L 以上の整数に設定しなければなりません。. Jump to: navigation, search. usleep() is implemented using an interruptible wait() function, and does not use signals. Now you can test your development setup by running the examples that came with the Qt 5 installation. nanosleep의 경우 사실상 CPU를 적게쓰기 위해 호출하는. Still some more time related things to work on but it compiles. Simple semaphore example with sem_wait/sem_post interface */ #include #include #include #include /*--- macro that simplifies handling errors with function calls. 10 nanosleep: High-Precision Sleeping. The pthread_mutex_t variable has __data. WizNET hardware TCP/IP stack – I 2 C interface: This example uses a TCP/IP coprocessor to produce an embedded web server through the I 2 C port! WizNET hardware TCP/IP stack – memory mapped interface: This example uses the same TCP/IP coprocessor, but with a memory mapped interface on a Tern E-Engine. そうしたら次は, Documentation/rtc. Nanosleep in C / C++. 进程收到abort信号后crash了,用lldb分析core文件得到貌似是因为析构时多次释放内存引起的,我对lldb不熟悉,bt输出来的信息定位到protobuf源码去了,不知道如何分析。. Working with Video Using OpenCV and QT Video processing is a very important task in computer vision applications. A list of CPUs to monitor can be passed. nanosleep syscall. Anybody have any example code? I know there is the nanosleep. How to use Nanosleep to make a program sleep for a certain amount of time. As each architecture provides its own implementation of certain system calls, we will consider only x86_64 specific implementations of system calls, as this book is related to. * * Neither the name of Intel Corporation nor the names of its. Assuming that you've saved the above program as nanosleep_demo. Hence there are no interactions with SIGALRM handling, or with any other wait function (for example, sleep()), as there are on some UNIX platforms. Update libogc - 1. Producer-consumer problem is the standard example of multiple process synchronization problem. Some safety standards (NASA, MISRA) force specifying number type if the number is bigger then 2^16 to avoid buggy code. The main thread spawns a pthread and then blocks on a condition waiting for a signal from the pthread. nanosleep(): _POSIX_C_SOURCE >= 199309L Description. For UNIX systems, a standardized C language threads programming interface has been specified by the IEEE POSIX 1003. 53 clock_nanosleep(2) nanosleep(3)と同様にナノ秒のスリープが可能です。Linux 2. The parameter typically specifies seconds, although some operating systems provide finer resolution, such as milliseconds or microseconds. First column contains format specifiers for the String. ) tjm: It is difficult to efficiently fix this, other than leaking old keys. Hi all, I am writing a small program where I need to sleep for a small amount of time (50 milliseconds), but one of the requirements is that it must compile cleanly (no warnings) with -std=c99. For example if you compile with -std=c99 nanosleep should be available. Thread design, so the use of this function in a POSIX thread result in undefined behavior of any Boost. c言語ポインタ完全制覇 (標準プログラマーズライブラリ) ポインタの解説書としては最高の書籍です. この1冊でポインタを完全に理解することができます.全くの初学者が読むには敷居が高いですが,入門書を読み終えた後に読むと非常に有益です.. I think this is important because for embedded environments several rules preclude the usage of such C constructs. A response to the note below: Your function is also useless, as the WinNT 32 kernel only functions at a minimum of about 10+ ms (1,000 us), rendering usleep() useless, because usleep uses the C function which is provided by the system (in this case, kernel32. This program ran fine previously but we recently rebooted our Phi nodes in our cluster and since then this offloading example will not run. For example, the following command can be run to extract core dump related to process with pid 22739 into file myapp. (in case you should set it to sleep for several hours, and by. If you are using *nix I wrote some examples of how to use the userspace timers here: SourceForge. an essential resource for the serious or professional Linux and UNIX systems programmer. org: The mission of Resume-Help. c // compile with: /W3 // This program opens two files. For example, if you run run /bin/cat, it //will use BusyBox cat even if /bin/cat exists on the filesystem and is _not_ //busybox. —Ulrich Drepper, Project Lead, GNU C library “A gentle yet thorough introduction to the art of UNIX system programming, Linux Programming by Example uses code from a wide range of familiar programs to illustrate each concept it teaches. These are the top rated real world C++ (Cpp) examples of statvfs extracted from open source projects. The nanosleep() function shall cause the current thread to be suspended from execution until either the time interval specified by the rqtp argument has elapsed or a signal is delivered to the calling thread, and its action is to invoke a signal-catching function or to terminate the process. From: Andrei Vagin clock_nanosleep() accepts absolute values of expiration time when TIMER_ABSTIME flag is set. That means the userspace function "nanosleep" should not be called with a granularity finer than 100000ns (1/100th sec). Various methods for obtaining high resolution time stamping on Windows have been described. Re: Help exposing a C++ function with argument Fail to build hello-world example with emscripten following bazel. nanosleep(), usleep() and sleep() Precision Tests Working on some Amazon EC2 benchmarks I run through few problems of having my processes to run with a high time precision where a more than 1ms shift between operations is not acceptable. nanosleep(2) is a socalled realtime function, which is complicating the situation. It may be not only your code, but a library you are using or the standard C library. They're exactly the same except that one has a resolution in microseconds, and the other, newer one, is in nanoseconds. org: The mission of Resume-Help. nanosleep syscall. The continue statement passes control to the next iteration of the nearest enclosing do, for, or while statement in which it appears, bypassing any remaining statements in the do, for, or while statement body. Prominent examples are the control of machines and robots in production environments (Industry 4. Easy enough, but do not forget the +1 in the first parameter slot on the select. Several implementations use alarm(2) for example, which works quite well. > to pause for 10 seconds, for example; this does not work for > fractions of a second, which is the original question. But finding the information you need and making sense out of it can be difficult tasks, even for experienced UNIX users. You can also watch the standard peripherals library examples for STM32F1, STM32F2, STM32F3 etc. We apologize for the inconvenience. A thread is a single sequence stream within in a process. I can slowly (very slowly) try to build these C++ basics, but my time is very very limited, and I would rather spend that time developing more robotic projects. The tutorial begins with an introduction to concepts, motivations, and design considerations for using Pthreads. 것은 적절하지 않다는 생각이 듭니다. Some systems want this, others do not. The problem with wall-clock time is that it can jump all over the place. I could easily be wrong, though. Acess ARM9 hardware timers ( C and Linux ) How do one use these timers in linux from 'C'. For example, 6:00pm is a wall clock time. The first is the path to the file to check. The pthread_mutex_t variable has __data. HP C Run-Time Library Reference Manual for OpenVMS Systems nanosleep setitimer strftime strptime time times tzset ualarm program example: UNIX I/O functions. c:22 [email protected] This article covers Win32 API mapping, particularly process, thread, and shared memory services to Linux on POWER. On Unix system signals interrupt system calls, including sleep(). 1c standard. perf script --gen-script python. Use the new POSIX unlink semantics on NTFS starting with Windows 10 1709. If a thread is cancelled while suspended in one of these functions, the thread immediately resumes execution, then locks again the mutex argument to pthread_cond_wait and pthread_cond_timedwait , and finally executes the cancellation. For UNIX systems, a standardized C language threads programming interface has been specified by the IEEE POSIX 1003. C does not use signals. 1 Generator usage only permitted with license. I've recently received my Pi, and I've begun working on a test c++ OpenGL ES program. c example to make. •Linux-RT SDK is supported on AM335x, AM437x, and AM57x Sitara processors. This absolute value is inside the task's. The timing/sleeping method advised to be used in C loops etc seems to have broken in the latest firmware. Consequently, these time services shall expire when the requested. To have a maximum guarantee you need to use an OS that explicitly supports it. Written by the language author, and known colloquially as the "K & R" book—a book of lore The C Book second edition by Mike Banahan, Declan Brady and Mark Doran is freely available online. Assuming that you've saved the above program as nanosleep_demo. Using and Understanding the Real-Time Cyclictest Benchmark Cyclictest results are the most frequently cited real-time Linux metric. Schulz, “StackTrace Analysis for. The C/Unix time- and date-handling API is a confusing jungle full of the corpses of failed experiments and various other traps for the unwary, many of them resulting from design decisions that may have been defensible when the originals were written but appear at best puzzling today. Some safety standards (NASA, MISRA) force specifying number type if the number is bigger then 2^16 to avoid buggy code. I have one signal call SIGUSR1 2. C and C++ code examples below "_sleep()" can be replaced by a number of Linux (UNIX) functions, depending on the time resolution. For example, if we assume that a user has created a C file named my_module. C++ Standard Library. Each tool also has an example. As each architecture provides its own implementation of certain system calls, we will consider only x86_64 specific implementations of system calls, as this book is related to. and provide a link to the original. nanosleep() - Unix, Linux System Calls Manual Pages (Manpages) , Learning fundamentals of UNIX in simple and easy steps : A beginner's tutorial containing complete knowledge of Unix Korn and Bourne Shell and Programming, Utilities, File System, Directories, Memory Management, Special Variables, vi editor, Processes.