the thread is blocked, the function is automatically called lck.unlock() 释放锁,使得其他被阻塞在锁竞争上的线程得以继续执行。 in addition, once the thread is notified (notified, which is usually called by some other notify_* to wake up the current threads), the wait () function is also automatically called Lck.lock (), making the state of lck and the wait function is the same as when it is invoked.In the second case (that is, predicate is set), calling Wait () only when the pred condition is false will block the current
Signal--sigpending function
The sigpending function returns a signal that is blocked and is pending for the calling process. The signal set is returned by the set parameter.
#include int sigpending (sigset_t *set);Successful return 0, error returned-1
The following code shows the characteristics of all the signals we have described.
#include static void Sig_quit (int); IntMain (void){sigset_t Newmask, Oldmask, Pendmask; if (Signal (sigquit, sig_quit) = = Sig_err) {printf ("Can ' t catch
is very effective for processing multi-byte characters. Mysql_real_escape_string determines the character set, and mysql_escape_string does not need to be considered.
For other string processing functions, see: Regular string replacement in PHP and comparison of split functions.The following is a summary of Special Character Processing in common forms:Test string:1 $ dbstr = 'd: \ test2 3 \'! = \ '1 \ 'OR \ '1 \'4 5 678 Test code:01 header ("Content-Type: text/html; charset = UTF-8 ");02
count, and when other methods are called in the critical section, the count is added to 1, and the calling method exits with a lock minus 1.Pay attention to the abnormal handling of the critical section and do not jump out of the critical area due to anomalies.8. The conditional object is used for the thread to wait for a condition to be satisfied when performing the action. A simple lock does not satisfy this scenario.A lock can be associated with multiple condition variable condition. Bankloc
esetvaluewithoverwrite:pxtcb->ulnotifiedvalue = Ulvalue; Break Case Esetvaluewithoutoverwrite:if (UCoriginalnotifystate! = tasknotification_received) {Pxtcb->ulnotifiedvalue = Ulvalu E } else {/* The last notification value has not been taken away, this notification value is discarded */Xreturn = Pdfail; } break; Case Enoaction:/* Do not need to update the notification value */break; } tracetask_notify (); /* If the notified tas
the sound in the background. This is the default value, and the above code can be written directly as "Myaudio.play (@ "c:\test.wav"); ".
Backgroundloop, looping through the background until the stop () method is called.
Waittocomplete, play the sound until the sound playback is complete before continuing to execute other code.
Basic Application of NetworkSometimes you need to determine whether the network is unblocked in the software, o
The admin5 webmaster was unblocked by Baidu and received enthusiastic attention from the majority of webmasters. Qq and the major webmaster communities are discussing why admin5 can be unblocked. All kinds of guesses and inquiries are found. Many people directly asked me how much I spent. Who is it. I asked him to unban his account for 10 thousand. It was speechless. At the request of many people, I sorted
quotation marks, HTML tags, links, unblocked HTML tags, database syntax error tolerance, JS execution judgment, PHP execution judgment, multiple consecutive carriage return line breaks and spaces. Some of these concepts have an inclusive relationship, the same below.
The source code output is as follows (the JS script will be executed ):
II. data processing for form submission1. force add a backslashBecause some hosts enable the magic refere
point should indicate the same mutex when the wait operation is invoked, when the condition variable is bound to the mutex, or the behavior of the program is undefined. The condition variable must be used in conjunction with the mutex, on the grounds that the program needs to determine whether a condition (condition or predict) is tenable, and that the condition can be arbitrarily complex.
A thread leaving a critical section is unblocked (unblock) wi
disassociation (de-connect) or Deauthentication (de-authentication) frames as a response. These frames contain a Reason code (reason code) bit length of 16bit, which indicates that the other party is doing the wrong thing,
Code
Meaning
0
Reserved, not used (Reserved; Unused
1
Unspecified (Unspecified)
2
Previous identity authentication is invalid (Prior authentication is not valid)
3
The workstation h
the wrong exit.
ReaderWriterLockSlim class
It is characterized by:
When one thread writes to the data, all other threads that request access are blocked
When a thread reads from the data, other threads that request read allow the execution to continue, but the thread that requested the write is still blocked.
After the thread that writes to the thread ends, either the blocking of a write thread is unblocked
the last park method call that has not been unblocked, or null if the call is not blocked.
staticvoid
park()For thread scheduling, the current thread is disabled unless the license is available.
staticvoid
park(Objectblocker)For thread scheduling, the current thread is disabled before the license is available.
staticvoid
parkNanos(longnanos)To disable the current thread for thread scheduling, w
= "Apache" elif[[ $SERVER _id==3]];thenserver= " Na "elif[[ $SERVER _id==4]];thenserver=" all "else exitfi# based on the results of the read return, determine the installed PHP version echo "selectphpversion: 1php-5.2.17 (default) 2php-5.3.29 "sleep0.1read -p "pleaseinput1,2:" nbsp php_ver_idif[[ $PHP _ver_id==2]];thenphp_ver= "5.3.29 "Elsephp_ver=" 5.2.17 "fi# judging the network situation ping-c1-t1www.wdlinux.cn >/dev/null2>1# to determine if the network is
, the transport entity blocks the caller and sends a group to the server. Encapsulated in this packet net load is a transport layer message sent to the server transport entity.
The client's connect call will enable the transport entity to send a connect Request TPDU to the server. Lou this TPDU arrives at the server, the service entity checks to see if the server is being blocked in the Listen call. It then unblocked the server and sent the customer b
( \
(queuehandle_t) (xsemaphore), \
NULL, \
semgive_block_time, \
queuesend_to_back)
You can see that the release semaphore is actually a queued operation, and the blocking time is 0 (macro semgive_block_time definition).
For binary semaphore and count semaphore, according to the contents of the previous chapter can be summed up, the release of a semaphore process can actu
first open IE browser, and in the pop-up browser window address bar to enter the default IP address used by the router (this address can generally be found from the router's operating instructions), and then correctly enter the router login account, open the router's background management interface; Then ping in the admin interface to ping the DNS server address provided by the local Internet service provider, and if the destination address can be ping, it indicates that the line connection bet
the default processing action of the signal is to terminate the current process.
The program will keep counting in 1 seconds and print the counter, and 1 seconds will be signaled SIGALRM . Because of the computer configuration and so on, each computer in a second counted the number is different generally is different.
#include
alarmThe return value of the function is 0 or the time remaining for the alarm clock was last set.
Blocking signal
1. Signal in the kernel of the exp
sent to the client. The client is thus unblocked.
Look at the data structure and server and client-related properties first
Blocking state typedef struct BLOCKINGSTATE {/* Generic fields. */mstime_t timeout; /* Timeout Time * * * redis_block_list/* dict *keys; /* The keys we are waiting to terminate a blocking * operation such as Blpop. otherwise NULL. * * RobJ *target; /* The key that is should receive the element, * for Brpoplpush. *///
alarm function can set an alarm, is to tell the kernel in senconds seconds to send the current process SIGALRM signal, the default action is to terminate the current process, The return value of the function is 0 or the number of seconds remaining for the previously set alarm time.Third, the way to deal with the signal① Ignore this signal② the default processing action for performing signals, typically terminating a process③ Capture SignalIv. recursion and blocking of signals①, blockingThe actu
. Therefore, this pair of method calls must be placed in such a synchronized method or block where the locked object of the method or block is the object that invokes the pair of methods. If this condition is not met, the program can still compile, but the illegalmonitorstateexception exception will occur at run time.
The above characteristics of the wait () and notify () methods determine that they are often used with synchronized methods or blocks. A comparison between them and the operat
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