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most basic usage of tar. To help you compress or decompress the packageFile, tar provides a special feature. This means that tar can call other pressures while packaging or unpacking.Program shrinking, such as calling gzip and Bzip2.1) tar calls GzipGzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. And GzipThe relative decompression program is gunzip. Use the-Z parameter in tar to call gzip. The following is an example.:# Tar-CZF all.tar.

null, the effect is equivalent to pthread_cond_t cond = pthread_cond_initializer. Function prototype:Int pthread_cond_broadcast (pthread_cond_t * Cond ); Function Description:All threads waiting for the cond condition variable are blocked. Function prototype:Int pthread_cond_signal (pthread_cond_t * Cond ); Function Description:Only remove the blocking status of a thread waiting for the condition variable cond. If several threads are suspended and waiting for this condition variable, th

all.tarThis command is used to list all files in the all.tar package.-T is used to list objects.# Tar-XF all.tarThis command is used to extract all files in the all.tar package.-X is used to unlock the file.The above is the most basic usage of tar. To help you compress or decompress the packageFile, tar provides a special feature. This means that tar can call other pressures while packaging or unpacking.Program shrinking, such as calling gzip and Bzip2.1) tar calls GzipGzipis a program develope

3. Condition Variables The previous section describes how to use mutex to share and communicate data between threads. One obvious drawback of mutex is that it has only two States: Lock and non-lock. Conditional variables make up for the lack of mutex lock by allowing the thread to block and wait for another thread to send signals. They are often used together with mutex locks. When a condition variable is used to block a thread, when the condition is not met, the thread often

or subitem. RegSetValueEx RegUnLoadKey uninstalls the specified item and all its sub-items. RemoveDirectory: delete a specified directory SearchPath SetCurrentDirectory SetEndOfFile sets the current file location to the end of the file for an opened file SetFileAttributes SetFilePointer sets the current read/write location in a file SetFileTime: Set the file creation, access, and last modification time. The SetHandleCount function does not need to be used in win32. Even if it is used, it will n

derived from the paragraph in the book. In my own words, I sum up the following: When the pthread_atfork function is called to create three functions to help clear the lock, when a thread of the parent process calls fork, first, the prepare fork processing program is run to let the parent process occupy all the locks. After the prepare fork processing program is run, all the locks of the parent process are locked. After that, run the child fork processing program. when running the child fork,

, you should not connect to a common Qt library, dynamically load a common Qt library, or dynamically connect to other libraries or plug-ins that depend on the common Qt library. In some systems, this will cause the static data used in the Qt library to become unreliable. QT provides support for threads in three forms. They are platform-independent threads, thread-safe event delivery, and cross-thread signal-slot connections. This makes it easier to develop lightweight multi-threaded Qt program

time.SetHandleCountThis function does not have to be used in win32; even if it is used, it will not have any effect.SetVolumeLabel sets the Label of a disk)SystemTimeToFileTimeLoad a SYSTEMTIME structure according to the content of a FILETIME StructureUnlockFile unlocks a fileUnlockFileEx unlocks a fileUnmapViewOfFileUnmaps a file ing object from the memory address space of the current application.VerFindF

pthread_cond_wait () call performs many operations before the return: pthread_mutex_unlock(mymutex); It unlocks mymutex and then enters sleep state, waiting for mycond to receive the POSIX thread "signal ". Once a "signal" is received (quotes are enclosed because we are not discussing traditional UNIX signals, but the signals from pthread_cond_signal () or pthread_cond_broadcast () calls), it will wake up. But pthread_cond_

the most basic usage of tar. To help you compress or decompress the packageFile, tar provides a special feature. This means that tar can call other pressures while packaging or unpacking.Program shrinking, such as calling gzip and bzip2.1) tar calls gzipGzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. And gzipThe relative decompression program is gunzip. Use the-z parameter in tar to call gzip. The following is an example.:# Tar-czf all.

above is the most basic usage of tar. To help you compress or decompress the packageFile, tar provides a special feature. This means that tar can call other pressures while packaging or unpacking.Program shrinking, such as calling gzip and Bzip2.1) tar calls GzipGzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. And GzipThe relative decompression program is gunzip. Use the-Z parameter in tar to call gzip. The following is an example.:# Tar

calls Gzip Gzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. The decompress program relative to gzip is gunzip. Use the-Z parameter in tar to call gzip. The following is an example: # Tar-CZF all.tar.gz *. jpgBytes # Tar-xzf all.tar.gzThis command unlocks the generated package. 2) tar call Bzip2 Bzip2is a more powerful compression program. The file ending with .bz2 is the result of Bzip2 compre

usage of tar. To help you compress or decompress files while packing and unpackage, tar provides a special feature. This means that tar can call other compression programs, such as gzip and Bzip2, while packaging or unpacking.1) tar calls GzipGzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. The decompress program relative to gzip is gunzip. Use the-Z parameter in tar to call gzip. The following is an example:# Tar-CZF all.tar.gz *. jpgBy

other pressures while packaging or unpacking.Program shrinking, such as calling gzip and Bzip2.　　1) tar calls GzipGzipis a program developed by gnuorganization. The file ending with .gz is the result of gzip compression. And GzipThe relative decompression program is gunzip. Use the-Z parameter in tar to call gzip. The following is an example.:# Tar-CZF all.tar.gz *. jpgThis command is to compress all .jpg files into a tar package and use gzip to generateThe package name is all.tar.gz.# Tar-xzf

/views/devise/unlocks create app/views/devise/unlocks/New.html.erb invoke Erb Create app/views/devise/Mailer Create App/views/devise/mailer/Confirmation_instructions.html.erb Create App/views/devise/mailer/Reset_password_instructions.html.erb Create App/views/devise/mailer/unlock_instructions.html.erb(5) Generate the following table/workspace/shop:$ rake db:migrate= = 20151026095446 devisecreateusers:migrat

router R3, it unlocks the received packet, discovers the GRE header, and itself is the end of the GRE tunnel, again unpacking the packet, when it discovers that the source IP address is 10.1.1.1, the destination IP address is 192.168.1.1, and the packet is then sent to XP2. After the XP2 receives the packet, it responds with a packet with a source IP of 192.168.1.1 and a destination IP of 10.1.1.1. The GRE header is also encapsulated after reachi

; INSERT INTO T1 select * from T2;ERROR 1100 (HY000): Table ' T1 ' is not locked with LOCK TABLESmysql> Lock table T1 WRITE,T2 write;Query OK, 0 rows Affected (0.00 sec)mysql> INSERT INTO T1 select * from T2;Query OK, 869 rows affected (0.01 sec)records:869 duplicates:0 warnings:0Mysql> unlocks;Error 1064 (42000): You have a error in your SQL syntax; Check the manual-corresponds to your MySQL server version for the right syntax-use-near '

before using Unlock (). A locked mutex is not associated with a particular goroutine, so it can be locked with one goroutine and then unlocked with another goroutine. Example of normal operation: When unlock () is used before lock (), an error is raised When the lock is locked again before unlocking, the deadlock state Package Mainimport ("FMT" "Sync") func main () {var l *sync. MUTEXL = new (sync. Mutex) L.lock () fmt. Println ("1") L.lock ()} Run Result: 1 fatal error:all Goroutines

This is a creation in Article, where the information may have evolved or changed. Golang mutexes and read-write locks The Golang Sync package implements two types of lock mutexes (mutexes) and Rwmutex (read and write locks), where Rwmutex is implemented based on mutexes, and read-only locks are implemented using similar functions as reference counters. Type Mutex func (M *mutex) Lock () func (M *mutex) Unlock () Type Rwmutex func (RW * Rwmutex) Lock () func (rw *rwmutex) Unlock () func (rw *rwmu

been acquired by other threads, then signal wake Pthread_cond_wait will continue to wait for the mutex to be fetched away from the thread release, May wait longer than the previous case, and the other add thread wakes it up. Not sure whether the analysis is correct, so on the stack overflow see the same problem, it is recommended to put signal before unlock, some translation summarized as follows:If the Add function will unlock before, signal may produce spurious wakeups, consider the following