groupon pending

combinatorial problems are not a problem here, because there is no choice. For example, I want to implement a thread-safe integer (assuming only with + + and--), probably doing type safepending struct { pending int mutex sync.RWMutex}func (s *safepending) Inc() { s.mutex.Lock() s.pending++ s.mutex.Unlock()}func (s *safepending) Dec() { s.mutex.Lock() s.pending-- s.mutex.Unlock()}func (s *safepending) Get() int { s.mutex.R

enabled here? Obviously not. The translator misunderstood the meaning of the original work. P63 L-17: cli and sti are assembly instructions for the clear and set allow interrupt (allow interrupts) Flag, respectively Correction: the translation is really awkward. Changed to "cli and sti call the Assembly commands that allow the clear and set operations of the interrupt mark respectively ." (It seems as awkward) P73 Correction: in this section, all the words "

problem.2.2 lock states)LockIt is very important to implement concurrent access, while for large-scale generic DBMS, the implementation of locks is also very complicated, while SQLite is relatively simple. Generally, the duration is the same as the transaction duration. One Transaction opensFirst, it locks, ends the transaction, and releases the lock. However, if the system crashes without the end of the transaction, the next connection to the database will handle this situation.There are 5 typ

Linux signal Programming Practice (3) Signal Representation in the kernel (sigaction sigqueue) Representation of signals in the kernel The processing action of the actually executed signal is called the Delivery, the State between the signal generation and the Delivery, and the Pending ). A process can Block a signal. When a blocked signal is generated, it remains in the pending state until the process unb

states: Pending: Initial state, not fulfilled or rejectedFulfilled: A successful operationRejected: Failed operationWe can see that the new promise is a pending state, fulfill after the call to the then callback function, if the reject will call catch for exception handling, and either call then or catch will return the new promise, which is why promise can be called by chain. Next, let's look at how the

In the previous blog post, roughly scattered about some of the interruption-related things, but the soft break of the part is not carefully introduced, here a unified summary.Interrupts the processing of the upper half and assembles the process between the handle of the REQUEST_IRQ.http://blog.csdn.net/jackjones_008/article/details/42387241A little record of the MIPS platformhttp://blog.csdn.net/jackjones_008/article/details/41945909Tasklet/workqueue's introduction is described in more detail in

http://blog.chinaunix.net/uid-16844903-id-3535535.htmlhttps://www.percona.com/doc/percona-monitoring-plugins/ 1.1/zabbix/index.html InnoDB Adaptive Hash Index InnoDB Buffer Pool Activity InnoDB Buffer Pool InnoDB Checkpoint Age InnoDB Current Lock Waits InnoDB I/O InnoDB I/O Pending InnoDB Insert Buffer InnoDB Insert Buffer Usage InnoDB Internal Hash Memory Usage InnoDB Lock Structures InnoDB Log InnoDB Memory Allocation

state_machine, we can easily implement many requirements. For example, when the order status changes, we need to record the following: Ruby code. ClassOrder State_machine: Initial=>: Pending Before_transition: Log_state_change #... End DefLog_state_change (Transition) Event, from, to = transition. event, transition. from_name, transition. to_name Puts ("Order # {number }:#{ from }=>#{ to} on # {event }") End End Cl

the recursion (delivery), and the signal from the generation to the state between the call signal pending (pending); The signal also has a status called blocking (block), that is, the signal is produced in a pending state but is not being handed down, but is blocked; it should be emphasized that the signal blocking and signal ignoring is not the same, the signal

/** per-cpu IRQ handling contexts (thread information and stack) */union irq_ctx { struct thread_ Info tinfo; U32 stack[thread_size/sizeof (u32)]; __attribute__ ((Aligned (page_size))); Static DEFINE_PER_CPU (Union Irq_ctx * , hardirq_ctx), Static DEFINE_PER_CPU (Union Irq_ctx *, SOFTIRQ_CTX), ... static void Call_on_stack (void *func, void *stack) ... ...Yes, this version is relatively complex, but if you look at the complex, and then look at the simple, i

constraint (exception The table needs to be created before load, and is defined as the target table +timestamp type Column+clob type column). In this example, lines 2nd and 5th violate the table definition, so they are stored in the DumpFile file, and lines 4th and 7th violate the uniqueness constraint and are stored in the exception table, and the remaining normal data is stored in the target table.5. Status of the Load tableLoad may appear in several states at a time that may be in several st

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

CustomerID" + ", Companyname,contactname from Customers"; IDbCommand cmd = Datafactory.createcommand ( Cmdstring, DBTYPE,CNN); DbDataAdapter da = Datafactory.createadapter (Cmd,dbtype); DataTable dt = new DataTable ("Customers"); Da. Fill (DT); return DT; } Public Customersds getcustomerorders (string CustomerID) { Pending return null; } Public Customerslist Getcustomersbycountry (String CountryCode) { Pen