, personalized recommendation shopping or social commerce. This is another hot spot in the e-commerce field after group buying, there will definitely be big companies like Groupon. As Mr. Liang said, we are still a new company and a small company. However, I believe that with the efforts of everyone, we can become a large company like Groupon, a public company, it is even a Fortune Five Hundred company."The
1. patientslikeme.com
Patientslikeme is a patientCommunityPlatform. Here, users can share their medical records and find patients with similar symptoms to improve the medical effect. About 70 thousand patients shared their medical records here.
2. flattr.com
This is a small donation service, which is similar to Facebook's "like" button: you can deploy the "flattred" donation button in the relevantArticleSide. If the reader wishesClick this button to make a donation. After PayPal, Master
As of 26th, the affected companies as many as hundreds, including Taiwan McDonald's, GROUPON, Google Taiwan, Yahoo! 's, Taiwan's high-speed rail, China Airlines, such as super large enterprises, Taiwan McDonald's whole Taiwan outbound dedicated line so lockout, Groupon Web page lockout users can not land, seriously damaged, but the specific amount for the external disclosure.Although the engine room fire oc
location, completion of the check-in process, Foursquare will be based on the location of the user check-in, to the user to return to the site near the other information.
2, Groupon. is a popular customer service, the daily launch of discount group service, ranging from catering to swimming, the content is very wide. Groupon has become a consumer of love since its launch. Users can also use the iphone to e
ready state):i) high-priority process readinessII) run out of process execution current time (each process has a specific time consuming resources)4) Wake-up process (enter ready state):(unlike wait, a process can only be woken up by another process or operating system)i) the resources required by the blocking process can be metII) The event that the blocked process waits for arrives5) Completion of the process:i) normal withdrawal (voluntary)II) false exit (voluntary)III) fatal error (mandator
is not an emergency signal, it may not be processed immediately. The operating system chooses to process the signal when the kernel state switches back to the user state, which is handled by switching between the two (without a separate process switch to avoid wasting time). is inevitable, because it is possible to receive a signal during the process of sleep, the operating system will not be willing to switch the current happy running process, so the signal must be stored ah, because it is th
first 32 signals and do not support queueing. In the fast send can cause loss, because in the process PCB control signal set of outstanding signals, is not queued, the arrival of multiple same-kind signals, there will only be a same kind of signal in the pending set.Reliable signalWith the development of time, it is proved necessary to improve and expand the original mechanism of signal. As a result, later versions of Unix have been studied in this a
stages, these three stages are characterized by four important events:The signal is born, the signal is registered in the process, the signal is written off in the process, and the signal processing function is completed.The following illustrates the practical significance of the four events:The signal "born". The birth of a signal is the occurrence of an event that triggers a signal, such as a hardware exception detected, a timer timeout, and a call to signal send letter kill () or Sigqueue ()
around, but look at the advanced use of JS function:
var pending = (function () {
var count = 0;
return function () {
count++;
return function () {
count--;
if (count = = 0) {
//all completed
}
}
}
When pending calls, that is, pending (), for example:
The count variable count is initialized
Preempt_enable_no_resched ();
}
#ifdef __arch_irq_exit_irqs_disabled
# define INVOKE_SOFTIRQ () __DO_SOFTIRQ ()
#else
# define INVOKE_SOFTIRQ () DO_SOFTIRQ ()
#endif
its DO_SOFTIRQ () function is defined as follows: There is a similar logic in the function.
asmlinkage void Do_softirq (void)
{
__u32pending;
Unsignedlong flags;
if (In_interrupt ())
Return
Local_irq_save (flags);
pending= local_softirq_pending ()//There is a software interrupt
software interruption, which are:
enum{HI_SOFTIRQ=0,TIMER_SOFTIRQ,NET_TX_SOFTIRQ,NET_RX_SOFTIRQ,BLOCK_SOFTIRQ,BLOCK_IOPOLL_SOFTIRQ,TASKLET_SOFTIRQ,SCHED_SOFTIRQ,HRTIMER_SOFTIRQ,RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */NR_SOFTIRQS};
Kernel developers do not recommend that we increase the number of software interruptions without authorization. If new software interruptions are required, implement them as tasklet Based on Software interruptions. In contrast to the enum
); // sleep, waiting for the user to send the SIGUSR1 signalReturn 0;}
3. process pending Signals
If a signal is blocked, but the process still receives the signal from somewhere, this signal is called pending. This signal is pending.
If there are any pending but no blocking signals after sigprocmask is called, at le
"alt=" Wkiom1csc5kwwxataaaojuw4ydw804.png "/>650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/7F/C8/wKioL1csdGuRbVQMAAAR6QD-8ys564.png "style=" float: none; "title=" 5.PNG "alt=" Wkiol1csdgurbvqmaaar6qd-8ys564.png "/>You can see that the process received a different signalSignal of blocking and handing upThe signal is not processed immediately when it is received, but at a suitable moment. This is the right time to handle when the process generates an exception, an outage, or a syste
closed * *
BLOCK_SOFTIRQ,
Block_iopoll_softirq,
TASKLET_SOFTIRQ,/* For low priority tasklet*/
SCHED_SOFTIRQ,
HRTIMER_SOFTIRQ,
RCU_SOFTIRQ,/* Preferable RCU should always is the last SOFTIRQ * * Nr_softirqs
};
For soft interrupts, Linux is executed in an interrupt handler, with the following specific path:
DO_IRQ ()->irq_exit ()->invoke_softirq ()->do_softirq ()->__do_softirq ()
/* Read the soft interrupt mask for the local CPU and perform the delay function associ
is a container for a list, and that it stores only the current head node, and that the following nodes are persisted by each reference node itself through next.
Reference State Value
Each reference object has a corresponding state description, that is, describing itself and the packaging object is currently in a state of what, to facilitate the query, positioning or processing.
1, Active: Active state, that is, the corresponding object is a strong reference state, has not been recycled, this
) {
var value = 1;
callback (value);
}
};
}
This completes the conversion. While it's not actually a useful conversion, it has actually touched on the most important implementation point of promise, that is, promise converts the return value to an object with a then method.
Advanced: Design distance of Q
Starting from defer
Design/q0.js is the first step in the initial formation of Q. It creates a tool function called defer, which is used to create the promise:
var defe
the operation, and then return a function for the callback, a bit around, but look at the advanced usage of the JS function:var pending = (function() { var count = 0; return function () { count++ ; return function () { count--; if (count = = 0) {// all execution completed }}} );When pending is called, it is
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.