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);} public void run () {Thread. currentThread (). setName ("sub-thread"); System. out. println ("entering the sub-thread"); B. bar (a);} public static void main (String [] args) {DeadLock dl = new DeadLock (); new Thread (dl ). start (); dl. init ();}} The running result is as follows: The main thread enters the sub-thread. The main thread enters the foo sub-thread of A and the bar sub-thread of B tries to call the last main thread of A and

then the server starts executing code, mainly to check if a file has been updated, if not, sleep for a while, wake up and check2. If the client also initiates a query link (normal request), after the server receives the request, processing it, and then updating the modify time of a particular file.3. The background code of the first AJAX query is still executing, and a file is updated, indicating that a new request has been made and the corresponding result is output.4. The callback of the firs

: NosuchmethodexceptionJava.lang.AbstractMethodErrorAbstract method Error. Thrown when an application tries to invoke an abstract method.Java.lang.AssertionErrorAssertion is wrong. Used to indicate a condition in which an assertion failed.Java.lang.ClassCircularityErrorClass loop-dependent error. When a class is initialized, the exception is thrown if a circular dependency between the classes is detected.Java.lang.ClassFormatErrorThe class format is i

: NegativearrayexceptionArray subscript out-of-bounds exception: ArrayIndexOutOfBoundsExceptionViolation of security principle exception: SecturityexceptionFile ended exception: EofexceptionFile not found exception: FileNotFoundExceptionstring conversion to numeric exception: NumberFormatExceptionManipulating Database Exceptions: SQLExceptionInput/Output exception: IOExceptionMethod not found exception: NosuchmethodexceptionJava.lang.AbstractMethodErrorAbstract method Error. Thrown when an appli

are many other exceptions, I will not enumerate, I would like to state that a qualified programmer, the program needs to have a good understanding of common problems and corresponding solutions, otherwise just stay in writing procedures and will not change the program, will greatly affect their own development. The full description of the exception is available in the API.Arithmetic Exception class: ArithmeticexecptionNull pointer exception class: NullPointerExceptionType cast Exception: ClassC

semaphore * sem ); This function is similar to the down function. The difference is that the down function is not interrupted by the signal, but down_interruptible can be interrupted by the signal, therefore, this function has a return value to identify whether the signal is normal or interrupted. If 0 is returned, it indicates that the semaphore is returned normally. If the signal is interrupted, the-EINTR is returned. Int down_trylock (struct semaphore * sem ); This function

structure pointer regs points to a copy of the content of each register in the CPU before an exception occurs, which is saved by the interrupt response mechanism of the kernel ", error_code further specifies the reason for the ing failure. If the local interrupt is enabled before the page is missing or when the CPU runs in 80x86 mode, enable local_irq_enable () and save the pointer to the current process descriptor in the tsk local variable. * Next: This figure is described as follows: Do_page

: NosuchmethodexceptionJava.lang.AbstractMethodErrorAbstract method Error. Thrown when an application tries to invoke an abstract method.Java.lang.AssertionErrorAssertion is wrong. Used to indicate a condition in which an assertion failed.Java.lang.ClassCircularityErrorClass loop-dependent error. When a class is initialized, the exception is thrown if a circular dependency between the classes is detected.Java.lang.ClassFormatErrorThe class format is i

containerChildcontroller: Child View ControllerWhen the child view controller that you want to add is already included in the View controller container, it is equivalent to first being removed from the parent view controller and then re-added to the parent view controller.2. Removefromparentviewcontroller method 1 -(void)removeFromParentViewController Removed from the parent view controller.3. Transitionfromviewcontroller method 1 -(void)tran

returnedRemotingServicesClassPropagateMessageToProxyPushes the returned Parameters Back to the stack. The following code snippet shows how to use the exportedRealProxyClass. MyRealProxy proxy = new MyRealProxy(typeof(Foo)); Foo obj = (Foo)proxy.GetTransparentProxy(); int result = obj.CallSomeMethod(); TheTransparentProxyIt can be forwarded to another application domain. When the second client tries to call a method on the proxy, the remote pro

Common exceptions:Java.lang.AbstractMethodErrorAbstract method Error. Thrown when an application tries to invoke an abstract method. Java.lang.AssertionErrorassertion is wrong. Used to indicate a condition in which an assertion failed. Java.lang.ClassCircularityErrorclass loop-dependent error. When a class is initialized, the exception is thrown if a circular dependency between the classes is detected. Java.lang.ClassFormatErrorThe class format is inc

already included in the View controller container, it is equivalent to first being removed from the parent view controller and then re-added to the parent view controller.Removefromparentviewcontroller Method-(void) RemovefromparentviewcontrollerRemoved from the parent view controller.Transitionfromviewcontroller Method-(void) Transitionfromviewcontroller: (Uiviewcontroller *) Fromviewcontrollertoviewcontroller: (UIViewController *) Toviewcontroller Duration: (nstimeinterval) Durationoptions: (

are many other exceptions, I will not enumerate, I would like to state that a qualified programmer, the program needs to have a good understanding of common problems and corresponding solutions, otherwise just stay in writing procedures and will not change the program, will greatly affect their own development. The full description of the exception is available in the API.Arithmetic Exception class: ArithmeticexecptionNull pointer exception class: NullPointerExceptionType cast Exception: ClassC

Install Python https://www.python.org/downloads/windows/i install it here on Windows, if other operating systems can be found separatelyAfter the installation is complete, open the execution program and enter the first commandPrint ("Hello world!") Note Because I use the new version here, so print after the parentheses, otherwise error"Syntaxerror:missing parentheses in call to ' print '" mean in Python? 。The following can be used to write a Python program, save after the click can be directly e

are many other exceptions, I will not enumerate, I would like to state that a qualified programmer, the program needs to have a good understanding of common problems and corresponding solutions, otherwise just stay in writing procedures and will not change the program, will greatly affect their own development. The full description of the exception is available in the API.Arithmetic Exception class: ArithmeticexecptionNull pointer exception class: NullPointerExceptionType cast Exception: ClassC

correct, it will showWget–spider URLSpider mode enabled. Check if remote file exists.HTTP request sent, awaiting response ... OKlength:unspecified [text/html]Remote file exists and could contain further links,But recursion is disabled-not retrieving.This ensures that the download can take place at the scheduled time, but when you give the wrong link, the following error will be displayedWget–spider URLSpider mode enabled. Check if remote file exists.HTTP request sent, awaiting response ... 404

request sent, awaiting response ... 404 Not FoundRemote file does not exist-broken link!!!You can use the spider parameter in the following situations:Check before scheduled downloadInterval detect whether a site is availableCheck for dead links on site pages8. Use wget–tries to increase the number of retriesIt is also possible to fail if the network is having problems or downloading a large file. wget default retry 20 connection download file. If ne

Arithmetic Exception class: ArithmeticexecptionNull pointer exception class: NullPointerExceptionType cast Exception: ClassCastExceptionArray negative subscript exception: NegativearrayexceptionArray subscript out-of-bounds exception: ArrayIndexOutOfBoundsExceptionViolation of security principle exception: SecturityexceptionFile ended exception: EofexceptionFile not found exception: FileNotFoundExceptionstring conversion to numeric exception: NumberFormatExceptionManipulating Database Exceptions

data can be manipulated, then a process goes to sleep, when the B process adds a node to the list, it wakes up a process, its code is as follows: a process: 1 Spin_lock (list_lock); 2 if (List_empty ( list_head) {3 spin_unlock (list_lock); 4 set_current_state (task_interruptible); 5 schedule (); 6 Spin_lock ( list_lock); 7}89/* Rest of the code ... */10 spin_unlock (list_lock);B Process: Spin_lock (list_lock), 101 list_add_tail (list_head, New_node); 102 Spin_unlock (list_lock); Www.2cto.com 10

found exception: NosuchmethodexceptionJava.lang.AbstractMethodErrorAbstract method Error. Thrown when an application tries to invoke an abstract method.Java.lang.AssertionErrorAssertion is wrong. Used to indicate a condition in which an assertion failed.Java.lang.ClassCircularityErrorClass loop-dependent error. When a class is initialized, the exception is thrown if a circular dependency between the classes is detected.Java.lang.ClassFormatErrorThe c