owns at t

Monitor.pulseall method notifies the ready queue that the next thread is making and all other ready queue threads will have the opportunity to acquire an exclusive lock. Thread x frees the lock and thread y obtains the lock while calling Monitor.Wait's thread x into the wait queue. When the thread (thread Y) from the currently locked object is under pulse or PulseAll, the thread waiting for the queue enters the ready queue. monitor.wait only returns when Thread X gets the object lock back. If t

determine whether a process (that is, a running program) has access to a file, you apply file permissions and ACLs as follows:1. If you are running the process as the user who owns the file, the user right to apply the file2. In addition, if the process is run as a user who is listed in the user ACL entry, the user ACL is applied (as long as mask is allowed)3. Also, if the process is run as a group that matches the group that

need to safely update multiple shared variables, that you cannot have a race condition, that you cannot break the data (assuming that the boundaries of the synchronization are correct), and that other threads that are correctly synchronized can see the latest values for those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run Anywhere"

requires that you consider everything you need to safely update multiple shared variables, that you cannot have a race condition, that you cannot break the data (assuming that the boundaries of the synchronization are correct), and that other threads that are correctly synchronized can see the latest values for those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a co

race condition, that you cannot break the data (assuming that the boundaries of the synchronization are correct), and that other threads that are correctly synchronized can see the latest values for those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run Anywhere", by following this simple rule: Whenever you write a variabl

used to calibrate the protected code fragment in the thread function. The resources used by the code after Lock () are automatically considered to be protected within the critical zone. These resources can be accessed by other threads after unlock. Mutex (mutex)The mutex is very similar to the critical section, and only the line that owns the mutex Cheng has access to the resource, and because the mutex has only one, it determines that the shared res

pathname is not a directory, then the call to the open function will return a failure. The thing to note is that the open function has two prototypes, one of which is out of mode, which specifies the access to the new file created, and if the O_CREAT flag is used to create the file, then the Mode argument is generally given. Some of her common values, shown in table 1.0, can be used in a bitwise OR combination. The user who owns the new file and the

permission statement, and we cannot determine who owns the permission. As a result, we need to correlate users and permissions in the application. It is common practice to assign permissions to a role and then associate the role with one or more users. Permission Declaration and granularity Shiro a permission declaration is usually a colon-delimited expression. As mentioned earlier, a permission expression can clearly specify the type of resource,

and rich. 7) One day, C has a bad idea, "well, if the land does not appreciate, b how to give back my money." After all, only 2 yuan in circulation, I think after all, B owns the land at most only worth 1 yuan. This is the same as a thought. 8) Nobody wants to buy the land. Finally, a has 2 yuan of money, his net worth is 2 yuan. B owes 2 yuan to the land, but he once thought that the value of 4 yuan is now worth only 1 yuan. His net worth has

copying assignments, and saving memory and valuable CPU time . The basic idea of reference counting is to transfer responsibility for destroying objects from client code to the object itself. The object tracks the number of its current references, not the specific record of who referred to it. Destroy yourself when the reference count reaches zero ... Reduces the cost of establishing and lifting references. . That is, the object is destroyed when it is no longer in use. Reference counting provi

. Aq_user_role, Aq_administrator_roleAq:advanced Query. These two roles are used for Oracle advanced query functionality.5. SnmpagentFor Oracle Enterprise Manager and Intelligent Agent6. Recovery_catalog_ownerUsed to create a user who owns the recovery library. For information on recovering a library, refer to the Oracle documentation oracle9i user-managed Backup and Recovery Guide7. Hs_admin_roleA DBA using Oracle ' s heterogeneous services feature n

message queue. The reason for this is that the window handle passed to the SetFocus function represents the window that must belong to the thread that called the SetFocus function, but the worker thread does not own the window or owns any windows. So why call the Setfoucs function to have this requirement? This can only be said I am not very clear, but in conjunction with "Windows core programming" in the 26th chapter of the relevant description

element without child elements or text. For example, $ ("div: empty"): select an empty 3. has (selector) selects an element that contains the matching element of the given selector. For example, $ ("div: has (. myClass) ") Select the 4. parent: select an element that contains child elements or text. For example, $ ("div: parent") Select the 3. Visibility filter Selector 1. Select all invisible elements, such as $ ("div: hidden"), and select all invisible 2. Select all invisible elements, for

used by only one thread at a time. Mutex: The critical section, the mutex, and the semaphore. Synchronized keywords : After compiling, the Monitorenter and monitorexit Two bytecode instructions are formed before and after the synchronization block. All two instructions require a parameter of a reference type to indicate the object to lock and unlock. If the object parameter is not explicitly specified, then the corresponding object instance or class object is taken as the lock object accor

pointer introduced in combination with qsharedpointer. It is more like a helper of qsharedpointer (because it does not act as a common pointer and does not overload operator * and-> ). It helps qsharedpointer to observe resource usage like a bystander. Weak_ptr is mainly used to prevent strong references from forming loops. From msdn: A cycle occurs when two or more resources controlled by shared_ptr objects hold mutually referencing shared_ptr objects. for example, a circular linked li

telephone technical support? Is there a time guarantee? #3:Who owns these facilities? When delivering a solution, it is different from engineering, manufacturing, circulation, warehousing, or other departments, and the importance of ownership cannot be clarified. For example, the company purchased a laser plastic cutting machine, but the instrument uses a computer to input the calibration code, and does not use it to adjust new equipment. Clearly ide

--------------------------------------------------- (5)Template Struct ** RHs): Yp (RHs ){}}; Auto_ptr (auto_ptr_ref Auto_ptr operator = (auto_ptr_ref Operator auto_ptr_ref Operator auto_ptr 1. constructor and destructorAuto_ptr obtains the ownership of an object (ownership) during construction and releases the object during structure analysis. We can use auto_ptr to improve code security:Int * P = new int (0 );Auto_ptr From then on, we don't have to worry about when to release P, or worry ab

if another thread currently owns the syncblock. If no process has it, the thread that calls enter becomes the owner of the object. On the other hand, if another thread already owns the syncblock, the thread that currently calls enter will be suspended until that thread releases ownership of the syncblock.If you want to write more defensive code, you can call one of the following tryenter methods:Public sta

The mutex class in the system. Threading namespace is used to control the connections between multiple threads without conflict or repetition. We can regard mutex as a taxi and passengers as a thread. The passenger first waits for the car, then gets on the bus, and finally gets off the bus. When a passenger is in the car, other passengers can get on the car only after they get off the bus. This is also the relationship between the thread and the mutex object. The thread uses mutex. the waitone (

; dump(N, lists:reverse(lists:ukeysort(4, all_pids(reductions)))).%%====================================================================%% Internal functions%%====================================================================get_procs(Apps, AppList) -> io:format("Searching for processes to profile...~n", []), Procs = lists:foldl( fun({App, Leader},Acc) when is_pid(Leader) -> case lists:member(App, Apps) of true -> [get_procs2(Leader)|Acc]; false -> Ac