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|+-----------------------+-------+| Table_locks_immediate | 18 || Table_locks_waited | 0 |+-----------------------+-------+ If the value of table_locks_waited is relatively high, it indicates a serious table-Level Lock contention. In MySQL, the two locks are maintained through four Queues: The two stores the Read and Write lock information currently being locked, and the other two stores the read/write lock information in the waiting state, as follows: • Current read-lock Queue (lo

address space of another process. Previously, all APCs waiting for execution in the context of the thread's own process cannot be shipped because the address space of the process to which it belongs is not currently available. However, the new APCs inserted into this thread can be executed in this new process space. Even when the thread is finally separated from the new process, the APCs inserted into the thread can be executed in the context of the process to which the thread belongs.To contro

Learn moreWeakReferenceBefore,First, give a simpleCode: Public ClassWeakreferencetest {Public Static VoidMain (string [] ARGs)ThrowsException {Object o =NewObject ();// The default constructor uses referencequeue. null as the queueWeakreference NewWeakreference System. Out. println (WR. Get () = NULL );O = NULL;System. GC ();System. Out. println (WR. Get () = NULL );}} Output result: False, true Questions about kids shoes , Why System . GC After Weak Reference Will be recycled imm

Runnable to mActive. If it is not empty, then let it be passed as a parameter to the execute method of THREAD_POOL_EXECUTOR for execution. As a result, we can see that the SerialExecutor actually uses the previously defined Thread PoolTHREAD_POOL_EXECUTORFor actual processing. When the Runnable in mTasks is passed as a parameter to THREAD_POOL_EXECUTOR to execute the execute method, the try-finally code segment in the Runnable of the anonymous internal class is executed in the thread pool, that

example, Kill-9 pid is to send Sigkill signal to a process to kill the process, Kill-2 PID is to send a CTRL + C signal to a process, so that the process end Checkb) Use the system to invoke the Kill function;#include c)alarm function, send yourself a SIGALRM signal , note that each process can only have a alarm timer, the new will replace the old one.#include 　　#include 　　2.2 The sleep function can be interrupted by a signal .2.2.1 such as this example, the program first sleeps 10s, if in thi

Label:? Reserved stateAfter entering reserved state, SQLite can modify the contents of the database, but write the modified content to the pager cache, the size is specified by the page cache . After entering this state, pager begins initializing the log file, user rollback, and exception recovery. (In fact, it is to copy the contents of the file in the log to the database file) This mechanism allows the database to be read at the same time as the write operation. However, because ther

Tags:-name mini rebuild man using user err-668 x861.DB2 database table operation error sql0668n operation not allowed for reason code "1" on table "XXXX". Solutions for sqlstate=57016 The table is an in Check Pending state. The integrity of the table is not enforced and the content of the table are invalid. an operation on a par ENT table or an underlying table, pending state could also receive this error

explanation:00: Clear SIGALRM SignalApply it a little bit./************************************************************************* > File name:alarm.c > AUTHOR:TP > Mail: > Created time:tue 2018 09:15:53 PM CST ************************************ / #include Signal Blocking the processing action of the actual execution signal is called signal arrival , the state of the signal from generation to arrival, called signal pending. the p

assume that CPU A is in this state:(1) No new request, that is, the Nxtlist list is empty(2) curlist list of batches to be processed, although the batch number is assigned, but the batch has not been started, which means that the batch is pending(3) The current batch in this CPU QS status has been detected by(4) There is no callback request in process, that is, the Donelist list is emptyIn this state, when the periodic tick arrives, in fact there is

picturePrivate drawable changeimg (int[] imgs) {Drawable drawable;int num = (int) (Math.random ());if (num>=0numdrawable = Getresources (). getdrawable (Imgs[0]);}else if (num>=1numdrawable = Getresources (). getdrawable (R.drawable.think);}else{drawable = Getresources (). getdrawable (Imgs[1]);}return drawable;}Trunk:Drawable drawable = null;int[] IMGs = Getimgs ();drawable = changeimg (IMGs);Imageview.setimagedrawable (drawable);10. Add menu and set Click Events (Menu Development 2)Copy someo

. Perform analysis: Recording: the mic is sent to codec and converted to a digital signal through the ADC. It is stored in the first-in-first-out (FIFO) of the CPU through the ac97 interface in pending 2, and transferred to the memory through the DMA Interface in pending 1, the snd_pcm_readi interface in alsa_lib to be continued 3 is passed to the recording software and encoded to form an audio file. Sound

. Other processes can perform any read/write operations on the database. This status is the default status.2). SHARED:In this status, the database can be read but cannot be written. At the same time, there can be any number of processes holding shared locks on the same database, so read operations are concurrent. In other words, as long as one or more shared locks are active, database file write operations are no longer allowed.3). RESERVED:If a Process intends to perform write operations in the

call the table method of the anonymous field. // UDP implements the RPC protocol. type UDP struct {conn // network connection netrestrict * netutil. netlist priv * ECDSA. privatekey // private key, which is used to generate your own ID. Ourendpoint rpcendpoint addpending chan * Pending // used to apply for a pending gotreply Chan reply // used to obtain the response queue closing Chan struct {} // used to

//Root bucket freelist Pgid //Indicates which page the current freelist data exists in Pgid Pgid // Txid Txid // Checksum UInt64 //Checksum of the above data, verifying that the data is damaged} Freelist According to the description in the previous introduction, the boltdb disk space of the space is not freed, so a mechanism is required to achieve the reuse of disk space, that is, the freelist implementation of the mechanism of the file page cache. Its data struct

One, the Resource Manager (DRM) consists of three elements: Resource Consumption Group (Resource_consumer_group) Resource Planning (Resource_plan) Resource planning directives (resource_plan_directive) To perform DRM-related operations, you must have Administer_resource_manager system permissions. Ii. pending domain (pending area) All three of the DRM elements must be created in the

on the database. This state is the default state.2). SHARED:In this state, the database can be read but cannot be written to. At the same time, any number of processes can hold shared locks on the same database, so read operations are concurrent. In other words, an operation that has a database file write is no longer allowed if one or more shared locks are active.3). RESERVED:If a process is going to write in the current database at some point in the future, but just read the data from the dat

error message reject (o.errormsg) ; }}} }); }); } GetUserID (). Then (function (ID) { //do STH with ID }, Function (Error) { console.log (error); }); If you are not familiar with the use of Promise, it is recommended to read JavaScript Promise cookbook Chinese version After mastering the use of promise, recommended to continue reading Promise Specification promise A + specification 2.Promise Implementation principle U

shared locks (read operations) in the database, then the write operation must be waiting, that is, waiting for all shared locks to disappear, while the new read operation will no longer be allowed. To prevent the writing of the hunger phenomenon of locking occurs. During this wait, the lock status of the database file is pending, and after all shared locks have disappeared, the pending lock state's databas

Before you knowWeak Reference , give a simple code : public class Weakreferencetest {public static void Main (string[] args) throws Exception {Object o = new Object ();The default constructor, which uses Referencequeue.null as the queueWeakreferenceSystem.out.println (wr.get () = = null);o = null;System.GC ();System.out.println (wr.get () = = null);}}output result : False,true Like to explore the children's shoes will ask , why System. GC after WeakReference will be recycled , How to do it ?

In 2.6.x, there is 3 mechanisms for implementing a bottom Half:softirqs, tasklets and work queues. Here ' s the comparison:Softirqs:Softirqs is statically allocated at compile time. It is represented by the softirq_action structure, which are defined in :struct softirq_action { void (*action) (struct softirq_action *);}A 32-entry Array of this structure are declared in kernel/softirq.c:Static struct softirq_action Softirq_vec[nr_softirqs];But of the current kernel, only nine exist: (as we'll