objective c usleep

/*** Write lock test* Open thread 1*/Require ("file_lock.php ");$ Lock = new File_Lock (dirname (_ FILE _). "/FileLock. lock ");/** The lock speed of a single thread is 30 thousand times per second. **//** Two threads write, 20 thousand of the data is about 7 s *//** Write data in one thread. The data size of 10 thousand is about 3.9 s. The two files are written at the same time, which is faster *//** If the lock is not performed, it takes about 2.8 seconds for a process to write data. Locking i

Example of using multiple processes to control file read/write simultaneously in php This article mainly introduces the example of using multiple processes to simultaneously Control File Read/write in php. For more information, see The Code is as follows: /** * Write data * @ Param [string] $ path [file path] * @ Param [string] $ mode [file opening mode] * @ Param [string] $ data [data] * @ Return [bool] */ Function writeData ($ path, $ mode, $ data ){ $ Fp = fopen ($ path, $ mode ); $ Retries

at 1508058077.6659(s)Log thread 1508058076.6664 at 1508058077.6671(s) Interestingly, the registration time of the green (simulated) thread and the red (simulated) thread is the same, indicating that the two (simulated) threads are concurrently executed. 2. PHP-FPM configuration item pm. max_children = 10, simulated. thread record as follows: Log thread 1508061169.7956 at 1508061170.7963(s)Log thread 1508061169.7966 at 1508061170.7976(s)Log thread 1508061169.7978 at 1508061170.7988(s)Log thread

); Delete Directory has cache usleep (1000); RmDir ($pDir); }}//New process directory if (!is_dir ($processDir)) {mkdir ($processDir, 0777); chmod ($processDir, 0777); }//write command parameter file_put_contents ($processCmdFile, $command); File_put_contents ($processPwdFile, $_server[' PWD '); Write files have cache usleep (1000); return true; }/** * _initprocesslocation *

Urgent request: About PHP Real-time output data to the client. The test code is as follows: Ob_start (); for ($i = 1; $i $sourceName = ' filetoupload '. $i; $imageArray = Array (); $message = "Image $i have been uploaded to the server"; Echo $message; Flush (); Ob_flush (); Usleep (500000); } Ob_end_flush (); ?> The test results are as follows: On the local server, the script can run side output, but in the intranet server running is 100 cycles after

doesn't affect the MapPoint pointer in the map. */mappointculling (); Triangulate New Mappoints/* This generates a map point that is not the same as the tracking line thread, where the map point is generated directly using the depth information. This is done again based on the neighbor frame of the current frame, using triangulation to generate the map points. This increases the visible distance of the slam */createnewmappoints (); if (! Checknewkeyframes ()) {//

progress, sleep () or usleep () to control the sleeping time, sleeps for seconds, Usleep for microseconds.6, for The small circle rotated in the load is counterclockwise through "/-|\". Implement the progress bar below650) this.width=650; "title=" 3.png "src=" http://s2.51cto.com/wyfs02/M02/82/4E/ Wkiol1dq7hhzgbjeaabvzmygnce884.png-wh_500x0-wm_3-wmp_4-s_269599084.png "alt=" Wkiol1dq7hhzgbjeaabvzmygnce884.p

always replays the last 0.2 or 0.5 seconds of data. Because only recently ported Dawnlightplayer used Windows, the mechanism was not well understood.static void Dsound_play (Avsample *s){int Wlen, ret, len = s->size;uint8_t *data = s->data;while (Len > 0){Wlen = Dsound_getspace ();if (Wlen > len) wlen = len;RET = Write_buffer (data, Wlen);Data + = RET;Len-= ret;Usleep (10*1000);}}Five. Audio and video synchronization1. Sync video on audio basisThe vi

#define __use_largefile64#define _largefile64_source#ifndef _gnu_source#define _gnu_source#endif#include #include #include #include #include #include #include #include #include #include ". /errors.h "#define Mutex_lockpthread_mutex_t Mutex;void *thread_function_even (void *inpara){int *num = (int *) Inpara;Long unsigned int thread_num = Pthread_self ();Pthread_detach (Thread_num); /*detach to is an independent thread*/while (1){#ifdef Mutex_lockPthread_mutex_lock (mutex);#endif*num = (*num * 2)%

Application:#include Usleep (n)//n μsSleep (n)//n msSleep (N)//n secDrivers:#include Mdelay (n)//milliseconds its implementation#ifdef NOTDEF#define MDELAY (n) (\{unsigned long msec= (n), while (msec--) udelay (1000);})#else#define MDELAY (n) (\(__builtin_constant_p (n) (n) ({unsigned long msec= (n), while (msec--) udelay (1000);}))#endifCalling Asm/delay.h's udelay,udelay should be nanosecond-delay.Dos:Sleep (1); Stay for 1 secondsDelay (100); Stay

the system can meet its maximum demand, allocate the resources according to the current amount of requests, or postpone the allocation. When the process continues to request resources in execution, first test the process for the number of resources this request exceeds the total amount remaining for that resource. If the resource is not allocated, the resource will be allocated according to the current application amount, otherwise the allocation will be deferred. Reference: http://blog.csdn.n

For example, the following code can be used for reference:static void _sleep_response_timeout (modbus_t *ctx) {#ifdef _WIN32/ * Usleep doesn ' t exist on Windows */ sleep ( Ctx->response_timeout.tv_sec * + (ctx->response_timeout.tv_usec/1000)); #else/ * Usleep Source Code */ struct TIMESPEC request, remaining; Request.tv_sec = ctx->response_timeout.tv_sec; Request.tv_nsec = ((long

is not reliable, the Apache restart will have to revisit, fastcgi will be better.The following code, under the current folder, can generate a test.txt and write a timestamp every 20 seconds, regardless of whether the client closes the browser.Ignore_user_abort (true);Set_time_limit(0);functionWrite_txt (){if(!file_exists("Test.txt")) {$fp=fopen("Test.txt", "WB");fclose($fp);}$str=file_get_contents(' Test.txt ');$str. = "\ r \ n".Date("H:i:s");$fp=fopen("Test.txt", "WB");fwrite($fp,$str);fclose(

The principles of the experimental design and the format of the test results are briefly explained: In order to ensure the reliability of the results, each group of experiments repeated 20 times, in a single experiment, given the same set of interface URLs, respectively measuring classic (referring to the classical concurrency mechanism) and rolling (refers to the improved concurrency mechanism) The two concurrency mechanisms are time-consuming (in seconds), the short duration wins (Winner), a

The purpose of using a timer is to perform a task periodically, or to perform a task at a specified time. In order to achieve this goal, there are generally two common and more effective methods. One is using the three timer inside Linux, and the other is sleeping or usleep the process to sleep for a while; in fact, there is another way, it is to use Gettimeofday, difftime and so on themselves to calculate the time interval, and then time to do a task

Copy Code code as follows: /** * Write Data * @param [string] $path [File path] * @param [string] $mode [File open mode] * @param [string] $data [data] * @return [BOOL] */ function WriteData ($path, $mode, $data) { $fp = fopen ($path, $mode); $retries = 0; $max _retries = 100; do { if ($retries > 0) { Usleep (rand (1, 10000)); } $retries + 1; }while (!flock ($FP, LOCK_EX) and $retries if ($retries = = $max _retries) { return fals