thread that uses a class of resources (represented by class goods) is called the consumer consumer, and the thread that produces the same resource is called producer. To enable consumer and producer to work together, they should follow the following rules:(1) The
First, why use producers and consumers?In the world of threads, the producer is the thread of the production data, the consumer is the thread of consuming data, in the multi-threaded development, if the producer processing speed is very fast, and the consumer processing speed is very slow, then the
Multi-producer Multiple consumer//This is a sample class Resource {Private String name that generates error data;
int count;
Boolean flag = false;
public synchronized void Produce (String name) {if (flag) {try {this.wait ();
catch (Interruptedexception e) {e.printstacktrace ();
} this.name = name + count;
++count;
System.out.println (Thread.CurrentThr
Tag: Python balanced signal res LAN multi Erro concurrent programmingIntroduction of a producer consumer modelWhy use a producer consumer modelProducers refer to the task of producing data, the consumer is the task of processing data, in concurrent programming, if the
This blog is a previous Java Multithreading (iii) Producer consumer model and the implementation of the method complement. The producer consumer model is implemented in three methods (lock, synchronized, blocking queue). The specific content is: The producer produces the ran
has been engaged for a long time, the producer and consumer model strengthened version (multi-person production multi-person consumption).The previous code format is no longer a slot (try to improve later)The output is an infinite loopImport Java.util.concurrent.locks.condition;import Java.util.concurrent.locks.lock;import java.util.concurrent.locks.reentrantlock;/** * Multiple producers multiple
condition variable. if the condition variable is statically allocated, you can also use a macro to define PTHEAD_COND_INITIALIZER for initialization. use pthread_cond_destroy to destroy the condition variable. if the condition variable is successfully returned, 0 is returned.
A condition variable is always used with a Mutex. A thread can call pthread_cond_wait to block the wait on a condition variable. this function performs the following three steps:
1. release Mutex
2. blocking wait
3. when a
read-write threads do not require mutual exclusion, is the producer of consumer issues, if there is no mutual exclusion between read read, each resource can be used by multiple read threads together, There is a requirement for mutual exclusion between writes (each resource is used only by one write thread), and the read-write thread also requires mutual exclusion (no writing when reading, no reading when w
, current product: 1 consumers are consuming ... -1, Current product: 0 producer is producing ... +1, current product number: 1 consumer is consuming ...-1, current product: 0 producer is producing ... +1, current product: 1 producer is producing ... +1, current product: 2 consume
the underlying channel in different ways based on the timeout configuration
If the data block is a close command, return directly
Otherwise, gets the current topic information. If the displacement value to be requested is greater than the current consumption, then consumer may lose data.
Then get a iterator and call the next method to get the next element and construct a new Messageandmetadata instance to return
3. Clearcurrentchunk:
Java thread: Concurrent collaboration-producer consumer model is the most classic model for multi-threaded programs, regardless of any programming language. Just like learning every programming language, Hello World! Are the most classic examples. In fact, it should be accurate to say that it is the "producer-consumer-
——-Android Training, Java training, look forward to communicating with you! ———-An overview of the JDK1.5 characteristics of producer and consumer problemsBefore JDK1.5, to address producer and consumer issues,With the Synchronized synchronous +while+notify ();However, this method is not safe, it is easy to get all the
What is a queue?Queue, is a data structure. In addition to the priority queue and the LIFO queue, the queues are sorted in FIFO (first-in, in-place) order for each element. The header of the queue is called remove () or poll () to remove the element, regardless of the sort method used. In the FIFO queue, all new elements are inserted at the end of the queue.Methods in the queueThe method in the queue is not difficult to understand, 6, every 2 pairs is a total of 3 pairs. Look at the JDK API and
What is a queue?Queue, is a data structure. In addition to the priority queue and the LIFO queue, the queues are sorted in FIFO (first-in, in-place) order for each element. The header of the queue is called remove () or poll () to remove the element, regardless of the sort method used. In the FIFO queue, all new elements are inserted at the end of the queue.Methods in the queueThe method in the queue is not difficult to understand, 6, every 2 pairs is a total of 3 pairs. Look at the JDK API and
For multi-threaded programs, both the producer and consumer models are the most classic, regardless of the programming language. Just like learning every programming language, Hello world! Are the most classic examples.In fact, it should be "producer-consumer-warehousing" model, leaving the warehouse, the
(a), the problem of the leadThere is a data storage space, divided into two parts, one for storing the person's name, and the other for storing the person's gender;Our application consists of two threads, one thread keeps adding data (producers) to the data storage space, and the other thread pulls the data out of the data space (consumer);Because of the thread uncertainty, there are two scenarios:1. if the produc
Producer and consumer models are ubiquitous in life and describe the relationship between coordination and collaboration. For example, a person is preparing food (producers), while another person is eating (a consumer), they use a common table for placing plates and taking dishes, producers prepare food, and if the table is full, wait for the
JAVA course 27th (multi-thread (6)-Multi-producer and multi-consumer questions (JDK1.5 new features) and jdk1.5 New Features
Multiple producers and consumers
Take the production of steamed bread for example.
Class Resource {private String name; private int count = 1; private boolean flag = false; public synchronized void set (String name) {if (flag) {try {this. wait ();} catch (Exception e) {// TODO: hand
Source code: Class producer extends thread {
Private cubbyhole;
Private int number; Public producer (cubbyhole C, int number ){
Cubbyhole = C;
This. Number = number;
} Public void run (){
For (INT I = 0; I Cubbyhole. Put (I );
Try {
Sleep (INT) (math. Random () * 100 ));
} Catch (interruptedexception e ){}
}
}
} Class cubbyhole {
Private int contents;
Private Boolean available = false; Public synchronized i
During this time, I have been working as a Java course TA with my tutor. Every day, I am bored with those boring questions! Today I finally met them with a difficult question:
Solve a single producer, single consumer problem using wait () and consumer y (). the producer must not overflow the generator's buffer, which c
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