C言語 read timerfd
The main advantage provided by timerfdis that the timer is associated to a file descriptor, and this means that it The information contained in the other answer about read() is valid as well: let's just say that, even using functions such as select(), read()function will be required in order to consume data in the file … See more This behavior is described by the following passage of the manual: The emphasis on the last paragraph is mine, as it shows what to do in order to have a single-shot timer. See more In the following demonstrative program, a timeout of 4 seconds is set; after that a periodic interval of 5 seconds is set. The good old select() is used in order to wait for timer expiration, and read()is used to consume data (that … See more WebDec 9, 2024 · g++ timerfd_test.cpp -pthread 效果如下, 运行时没问题,按ctrl+c时,发现程序卡主了,无法结束, 原因是:信号处理函数sig_handler里停止定时器后,read()函数阻塞住了,导致线程无法结束,这样main函数里的pthread_join()无法返回,归根到底是因为创建timerfd时选择了阻塞类型
C言語 read timerfd
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WebNov 25, 2016 · 读取timerfd. 当定时器超时,timerfd可读,返回uint64_t类型的整数,为超时的数目(指有多少个超时未读),如果定时器没有发生超时事件,若timerfd为阻塞时,read将阻塞,若timerfd为非阻塞时,返回EAGAIN错误。如果read是的数据小于8字节以EINVAL错误返回。 样例代码 WebApr 21, 2024 · The following is the synopsis of read function. ssize_t read(int fildes, void *buf, size_t nbyte); The second is the buf pointer and the third is the size to read. You set the size to 64 bytes. But the pointer is the address of exp(8bytes) which is assigned at stack. I think it can corrupt the stack.
WebJun 8, 2015 · Linux, timerfd accuracy. I have a system that needs at least 10 mseconds of accuracy for timers. I went for timerfd as it suits me perfectly, but found that even for times up to 15 milliseconds it is not accurate at all, either that or I don't understand how it works. The times I have measured were up to 21 mseconds on a 10 mseconds timer. WebC++ (Cpp) timerfd_create - 30件のコード例が見つかりました。すべてオープンソースプロジェクトから抽出されたC++ (Cpp)のtimerfd_createの実例で、最も評価が高いものを厳選しています。コード例の評価を行っていただくことで、より質の高いコード例が表示されるようになります。
WebDec 20, 2024 · 开篇的表格里有提到,从Linux2.6.25开始,timerfd系列API,带来了一种全新的定时机制。把超时事件转换为了文件描述符,当超时发生后该文件描述符会变成可读。于是超时事件就变成了普通的IO事件。如果未对timerfd设置阻塞,对其read操作会一直阻塞到 … WebJan 16, 2024 · Use the clock_gettime Function as Timer Benchmark in C. Alternatively, we can utilize clock_gettime to achieve similar measuring goals.clock_gettime is a more …
WebDec 18, 2024 · 开篇的表格里有提到,从Linux2.6.25开始,timerfd系列API,带来了一种全新的定时机制。把超时事件转换为了文件描述符,当超时发生后该文件描述符会变成可读。于是超时事件就变成了普通的IO事件。如果未对timerfd设置阻塞,对其read操作会一直阻塞到 …
WebApr 12, 2024 · 本当は自然言語系のLLaMaとか試したいのですが、あれを動かすには逸般の誤家庭レベルのGPUが必要なのでとても無理。 でも、画像生成ならこの程度のスペックでも十分に遊べるようなので、、、すがインストールできないことには話が始まりません。 how to remove delta shower handle 1400 seriesWebOct 21, 2024 · timerfd_settime () 用来启动或关闭fd指定的定时器. fd. timerfd_create函数返回的定时器文件描述符timerfd. flags. 1代表设置的是绝对时间;为0代表相对时间. new_value. 指定新的超时时间,设定new_value.it_value非零则启动定时器,为零关闭定时器,如果new_value.it_interval为0,则 ... how to remove delta faucet aeratorhow to remove delta kitchen faucet headWebtimerfd 的核心结构是 timerfd_ctx ,通过 fd 先找到 file 结构体,它就藏在 file->private_data 这里; timerfd 是直接复用的 hrtimer 或者 alarm 类型的定时器,timerfd 本身只是对定 … how to remove delta tub spout adapterWebC++ (Cpp) timerfd_gettime - 12件のコード例が見つかりました。すべてオープンソースプロジェクトから抽出されたC++ (Cpp)のtimerfd_gettimeの実例で、最も評価が高いも … how to remove demo mode from iphone 12Web.read = timerfd_read,.llseek = noop_llseek,.show_fdinfo = timerfd_show,.unlocked_ioctl = timerfd_ioctl,}; static int timerfd_fget(int fd, struct fd *p) {struct fd f = fdget(fd); if (!f.file) … how to remove delta tub stopperWebJan 1, 2024 · Use the gettimeofday Function to Implement a Timer in C++. gettimeofday is a highly accurate time retrieval function in Linux based systems, which can be called from … how to remove delta tub spout