interrupts
public static void T2 () throws Exception
{
thread t = new Thread (new Runnable ()
{
private int count = 0;
@Override public
Void Run ()
{
Long start = System.currenttimemillis ();
Long end = 0;
while ((End-start)
The end thread prints out the thread over.true. This means that a thread can respond to an interrupt request (the interrupt state is set to true) if it is blocked by calling park, but does not throw a interruptedexception.
Locksupport Fu
is God horse.
Continue to the popular science, said in the above, the cookie is timeliness, so, the management of the cookie is divided into persistent cookie and non-persistent cookie. Non-persistent cookies are stored in memory, which means that their lifecycle is basically consistent with the app and the cookie is lost after the app is closed. Persistent cookies are stored on a local disk and are not lost when the app is closed. So, if we want to use the cookie persistence strategy, the ide
is divided into multiple parts. The session segment information is always described in detail by a header. The Oracle8i and 9i information are slightly different:
Sid is the Session ID.
Sess_srno is serial #
Proc_ptr is Process Pointer
The ospid is the OS Process ID.
Cnode is the Node Id, which is used only by Oracle9i.
Nodenum is hanganalyze
Numbers customized to record these sessions start from 0.
State is the node State.
Adjlist is a nearby node (usually a
Find the specific trace file based on alert. Note that unlike normal deadlocks, the following Blocker (s) and Waiter (s) are the same sid, and the trace contains the SQL statements being executed and
Find the specific trace file based on alert. Note that unlike normal deadlocks, the following Blocker (s) and Waiter (s) are the same sid, and the trace contains the SQL statements being executed and
1. Or
How can we find the 'library cache pin' In the RAC environment to wait for the Blocker of the event )?, Racblocker
How to find the 'library cache pin' In the RAC environment and wait for the Blocker of the event)
ReferenceHow to Find the Blocker of the 'library cache pin' in a RAC environment? (Documentation ID 780514.1)
This article is not translated. The full t
multiple files are uploaded at a time, make sure that the names of all the upload controls are the same.Collection or array to receive information about all uploaded files, and operate the file set or array in the execute method. The code is as follows:Copy code // Determine the directory to UploadFor (int I = 0; I If (source. get (I )! = Null source. get (I). exists ()){File dest = new File (path + sourceFileName. get (I ));FileUtils. copyFile (source. get (I), dest ); } } 4. struts. xml
OverviewThis chapter describes the Locksupport in the Juc (java.util.concurrent) package. The content includes:Locksupport IntroductionList of Locksupport functionsLocksupport Reference code (based on JDK1.7.0_40)Locksupport ExampleReprint Please specify source: http://www.cnblogs.com/skywang12345/p/3505784.htmlLocksupport IntroductionLocksupport is the basic thread blocking primitive used to create locks and other synchronization classes.The role of Park () and Unpark () in Locksupport is to bl
1, if there is a display command bar, you can directly click the "Tools" button, the mouse pointer to move to the "Pop-up Blocker" on the extension bar can be directly clicked on the option to close or enable the window block program;2, click the "Pop-up Blocker Settings" (after the shutdown of this option is grayed out, can not be selected, enabled to operate);3, in the "block level" there are high, medium
Java 5 and later provide excellent concurrent libraries util. concurrent,. net lack similar functions. As the hardware system has changed and the multi-core era is approaching, the lack of concurrent class libraries in. NET is obviously out of date. One method is to port java's util. concurrent to C.
The util. concurrent package in java provides LockSupport class. Many key implementations of util. concurrent package need to call LockSupport. To Migrate java's util. concurrent package to C #, Th
I. Introduction of LocksupportLocksupport is the basic thread blocking primitive used to create locks and other synchronization classes.The role of Park () and Unpark () in Locksupport is to block and unblock threads, and park () and Unpark () will not encounter deadlocks that may be caused by thread.suspend and Thread.Resume.Because Park () and Unpark () have a licensed presence, the contention between calling Park () and another thread trying to unpark () will remain active.Why can suspend and
, the $http call fails.
intercept request exceptions by implementing the Requesterror method: Sometimes a request fails to send or is rejected by the interceptor. Request exception interceptors capture requests that were interrupted by a previous request interceptor. It can be used to restore the request or sometimes to undo the configuration that was made before the request, such as closing the progress bar, activating the button and the input box, and so on.
block The re
How to set up custom paper in Windows XP
The author of a needle-type printer has been used normally, because of the installation of a new set of software to upgrade the operating system to Windows XP. But found a modest problem, originally in Windows 98 printer custom paper settings options are not, and I need non-standard paper printing, after some groping, only to find a solution.
Click "start → settings → printers and Faxes" to select "Print Server Properties" in "Files" in the window that
Internet Explorer to open Internet Explorer.
Swipe from the right edge of the screen to the middle, and click Set.
(If you are using a mouse, point to the lower-right corner of the screen, and then move the mouse pointer up, and then click Settings.) )
Click or click Privacy, and under WEB Services, switch SmartScreen to OFF.
To turn SmartScreen on or off on the desktop
Open the desktop, and then click or click the Internet Explorer icon in the taskbar.
Tap or click the Tools button, and
After opening the computer, we open IE browser on the computer desktop, then click on the top right corner of the browser gear symbol as shown
In the pop-up option, we click on "Internet Options" as shown
After opening the Internet Options Settings window, we click on the "privacy" option shown in
After opening the privacy settings option, we hook under the Pop-up blocker to "Enable Pop-up Blocker"
This article describes how to trigger a PHP error through trigger_error in PHP. This article describes the error blocker @ and the example of triggering a PHP error through trigger_error, for more information, see trigger_error in PHP.
[Error blocker @]
In addition to setting error_reporting and display_errors, error_reporting (), and ini_set () functions in php. ini, you can also use the error
baseline)
Awr addm report for abnormal performance stage
SQL> @ $ ORACLE_HOME/rdbms/admin/awrrpt. SQL
SQL> @ $ ORACLE_HOME/rdbms/admin/addmrpt. SQL
2. system state dump
If no abnormal SQL is captured in AWR, you can use system state dump to capture holder and waiter processes.
(A) Non-Rac
Sqlplus "/as sysdba"
Oradebug setmypid
Oradebug unlimit
Oradebug dump systemstate 266
--- Wait 90 seconds ---
Oradebug dump systemstate 266
--- Wait 90 seconds ---
Oradebug dump systemstate 266
Oradebu
conditions to eliminate errors one by one, finally, locate the error code. In this case, if you want to completely eliminate logical errors, you can't do it without patience.
2. The behavior is undefined.
See the following code:
You can understand this code, that is, if the $ action variable is empty, set it to 1, and then judge the value of the $ action variable to make different events. Of course, what will PHP do if $ action is neither 1 nor 2? The answer is-nothing will be done, so a blank
:
You can understand this code, that is, if the $ action variable is empty, set it to 1, and then judge the value of the $ action variable to make different events. Of course, what will PHP do if $ action is neither 1 nor 2? The answer is-nothing will be done, so a blank page will be generated. Knowing the cause makes it easy to solve the problem. The solution to this problem is very simple. simply add an else after the if module and print some information.
3. Syntax error
You may ask, if a s
An article on MOS specifically introduces this issue. For details, refer to [ID 779552.1].
In Oracle 10.2.0.4, the following error may occur in Alert Log:
ORA-00494: enqueue [Cf] held for too long (more than 900 seconds)
This error usually occurs with the ORA-600 [2103. They have the same causes. The process cannot obtain the CF queue within the specified time (900 seconds by default.
Generally, the Oracle process occupies the relevant resources and is not released only when the system is in
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