objective c usleep

ztgame 0 1409m 1.2g 4252 S 0.0 7.4 2:42.18 Imvchannelserve 3, through the command pstack process ID display thread stack, LWP 24729 corresponding thread ID of the stack, is to occupy the highest CPU stack, can be specific analysis of what the cause. $ pstack 24714 Thread (thread 1084229984 (LWP 24716)): #0 0x00000039c5a901d5 in __nanosleep_nocancel () from/lib64/tl S/libc.so.6 #1 0x00000039c5ac3058 in Usleep () from/lib64/tls/libc.so.6 #2 0x000000

through crontab. For example, you can check the user status every 10 seconds. The script is as follows: @ File:/php_scripts/scan_userstatus.php The Code is as follows: #! /Usr/bin/env php-q $ Status = has_goaway (); If ($ status ){ // Done } ?> Execute the script scan_userstatus.php at regular intervals through crontab. # Echo "*: */10 ***/php_scripts/scan_userstatus.php" In this way, the script will be executed every 10 seconds. We found that in a short time, the memory resource

memory resources were not released and new scripts were enabled. That is: The new script is started, and the resources used by the old script are not released as intended. So, over time, a lot of wasted memory resources. We have made some improvements to this script, as follows: @file:/php_scripts/scan_userstatus.php Copy CodeThe code is as follows: #/usr/bin/env Php-q while (1) { $status = Has_goaway (); if ($status) { Done } Usleep (1000

the first thing to do is to manually replace C for a to send a signal, let the program execute. At the end of the 10 cycles of the 2.A thread, the flag flag bit is 0, and the C thread is not finished yet, C to check if the flag of a is 1 and then send a signal to a, so after the end of a cycle, it is set to 1 flag flag.#include#include#includestring.h>#include#include#defineLp_times 10pthread_mutex_t Mutex=pthread_mutex_initializer;pthread_cond_t Cond_ab=pthread_cond_initializer;pthread_cond_t

immediately, or do not release them at all, causing deadlocks, which can make the server CPU high and sometimes even kill the server completely. So simply using flock lock does not solve the problem completely. Scenario Two: Limit the lock time, timeout to exit if ($fp = fopen ($fileName, ' a ')) { $startTime = Microtime (); do{ $canWrite = Flock ($fp, lock_ex); if (! $canWrite) { Usleep (Round (rand (0) *)); Frees th

in Java gives the thread a priority, while hibernation causes the thread to go into a blocking state waiting to be woken up, where we compare the thread-waiting Wait () method to explain the thread concession yield () and the Thread Sleep Sleep () method in Java 4. PHP sleep () function, Usleep () function Introduction: This article mainly introduces the PHP sleep () function, Usleep () function, the need

:/php_scripts/scan_userstatus.php The code is as follows: #! /Usr/bin/env php-q$ Status = has_goaway ();If ($ status ){// Done}?> Execute the script scan_userstatus.php at regular intervals through crontab. # Echo "*: */10 ***/php_scripts/scan_userstatus.php" In this way, the script will be executed every 10 seconds. We found that in a short time, the memory resources of the script have not been released, and a new script has been enabled. That is to say, the new script is started, an

-q $ Status = has_goaway (); If ($ status ){ // Done } ?> Execute the script scan_userstatus.php at regular intervals through crontab. # Echo "*: */10 ***/php_scripts/scan_userstatus.php" In this way, the script will be executed every 10 seconds. We found that in a short time, the memory resources of the script have not been released, and a new script has been enabled. That is to say, the new script is started, and the resources occupied by the old script have not been released as ex

memory resources were not released and new scripts were enabled. That is: The new script is started, and the resources used by the old script are not released as intended. So, over time, a lot of wasted memory resources. We have made some improvements to this script, as follows: @file:/php_scripts/scan_userstatus.php Copy CodeThe code is as follows: #/usr/bin/env Php-q while (1) { $status = Has_goaway (); if ($status) { Done } Usleep (1000

0.0 7.4 0:00.00 Imvchannelserve24727 ztgame15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.76 Imvchannelserve24728 ztgame16 0 1409m 1.2g 4252 S 0.0 7.4 0:00.53 Imvchannelserve24730 ztgame16 0 1409m 1.2g 4252 S 0.0 7.4 2:42.18 Imvchannelserve3, through the command pstack process ID display thread stack, LWP 24729 corresponding to the thread ID stack, is the highest CPU stack, you can specifically analyze what caused the cause.$ pstack 24714Thread (thread 1084229984 (LWP 24716)):#0 0x00000039c5a901d5 in __na

/* * @FileName: TEST_SLEEP.C * @Author: WZJ * @Brief: * * * @History: * * @Date: February 07, 2012 Tuesday 22:20:00 * */ #include #include #include #include #include #include #include #include #include int main (int argc, char **argv) { unsigned int ntimetestsec = 0; unsigned int ntimetest = 0; struct Timeval tvbegin; struct Timeval tvnow; int ret = 0; unsigned int ndelay = 0; struct Timeval TV; int fd = 1; int i

improvements to this script, and the improvements are as follows: @file:/php_scripts/scan_userstatus.php Copy CodeThe code is as follows: #/usr/bin/env Php-q while (1) { $status = Has_goaway (); if ($status) { Done } Usleep (10000000); } ?> In this way, no need for crontab. The script can be executed with the following command to achieve the same functional effect #chmod +x/php_scripts/scan_userstatus.php #nohup/php_scripts/scan_userstatus.php He

files yourself, for example, you can copy them and rename them with a filename. bak. This is important to prevent you from being able to revert to a problem in the process of modification. 　　 I. Modification of SQLITE/MAIN.MK 1, TCCX Will TCCX = $ (TCC) $ (OPTS) $ (threadsafe) $ (USLEEP)-i.-i$ (top)/SRC Amended to TCCX = $ (TCC) $ (OPTS) $ (threadsafe) $ (USLEEP)-i.-i$ (top)/src$ (cflags) The $ (c

network communication functions very simple.Support for HTTP requests and rest-based network services (including GET, POST, PUT, delete, etc.)Support ArcRequires iOS 5.0 and laterThere are plugins that extend existing functionality and a full-featured APIHow easy is it to get json from a URL? Take a look at the following lines of codeNsurl *url = [Nsurl urlwithstring:@ "Https://alpha-api.app.net/stream/0/posts/stream/global"]; Nsurlrequest *request = [Nsurlrequest Requestwithurl:url]; Afjsonreq

other things, such as text that needs to be displayed, animations, x and Y settings, and so on, and many iOS instructors are using it, typically used for in-app purchasesMbprogresshud applies to any iOS version, requires LLVM3.0 and above compiler architecture, compatible with arc and non-arc projects, depending on Apple's following architecture:Foundation. ArchitectureUIKit. ArchitectureCoregraphics. ArchitectureTransparency Progress Effect10) afnetworkingafnetworking is a lightweight iOS Netw

actually a pointer to the instance variable of this object.Example: ID numberDeclare number as an ID variable. Declarative methods make them return values of the ID type as follows:-(ID) newobject; (INT) type;This program declares an instance method named newobject, which has a single integer parameter named type and a return value of ID type. It should be noted that, for the return value and parameter type declaration, ID is the default type.The ID type is the data type of unusual Chinese drug

source code of the XIB file. Next, let's take a look at mainwindow. XIB of the project and find that there is more content on the left side of the file. In the ios xib file, you can add any Objetive-C objects to the XIB file, which is created and destroyed by XIB (an autorelease object ). In this file, there are two object containers with advancedtableviewcellsappdelegate and uinavigationcontroller, which are often used in previous versions. In thi

personal information may store personal names, birthdays, addresses, and other content. You can declare some instance variables in the public section of the class interface: @interface EOCPerson : NSObject{@public NSString* _firstName; NSString* _lastName;@private NSString* _someInternalData;}@end; People who have used Java and C ++ are familiar with this method and can define the scope of variables. OC seldom does this. The variable memory layout in this writing method has been fixe

csdn. There are quite a few! The following describes the disguise of the system. Camouflage 10.5.7 is acceptable! Others may not work. Interested friends can try it on their own. 1. Download the iPhone SDK installation package: iphone_sdk_3.0 _ leopard _ 9m2736 _ final. DMG (download from the official website)2. Change the system version of 10.5.5:1) Find/System Disk/system/library/coreservices/systemversion. plist2) Open and modify it: 3) before saving the file, change the properties of the

Research tools Clang in order to study the compiler implementation principle, we need to use the clang command. The clang command can be used to rewrite the source code of the objetive-c into C + + language, which can be used to study the source code implementation of each feature in block. CLANG-REWRITE-OBJC main.m The Uikit framework cannot be included in main.m, and parsing in the command line is not recognized. Includes