Zaira Bains
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This time, I'm going to show you how to manage the creation of threads of a process to distribute the execution load in several instances. Each instance or thread will carry out a task.
A system for sending push notifications can be done by forking processes in the same thread, so that each thread takes care of sending the push notification.
When an algorithm is programmed, we have two ways to solve the execution of the code and these are: sequentially, which is nothing more than iterating the code in the same php process, or in parallel, which is based on creating several instances the execution of the php process to distribute the load and provide efficiency to our algorithm.
I am going to give you an example so that you can see it in a better way. A system that is responsible for getting a list of pending push notifications is possible.
Many of the notifications have a number of devices that are numerous.
If we execute our algorithm in sequential order, it will process notification by notification, one by one, that is, it takes the first one, selects the devices to which it should send push notifications.
The process won't move on to sending the next notification until it has finished sending all devices. This makes us think that the large-scale process can become a big problem.
This is where process forking begins. It is possible to make the creation of threads and the sending of push notifications to each of its devices by each thread.
The theoretical basis of forking or parallelization tells us that when the parent process launches a child process, a process identical to the parent is created in memory, with its own process identifier (pid) (different from the parent) and running from the instruction following the one that created the child process itself.
I will describe some of the methods that are available to us. You can review this link to learn more about these methods.
The two methods that we will be using in our example are the forking methods.
There are many other things that you can review on the official page of the website.
We are going to get a mental idea of the push notification sending system where each notification can have a number of devices to send.
The first thing we will do is create an abstract class (BaseTask.php) which will represent the structure that must extend the class (Task.php) which contains some specific methods that in our case we think will be where we will implement the process of sending the notification. push to each device.
The following methods were changed by the Task class.
We will create a class calledThreadManager which will be in charge of managing the creation of threads.
The thread manager is started by a single method called start.
This is where the pcntl_fork method is used to create a child thread that is identical to the parent but will perform different tasks.
If the pid is returned by the pcntl_fork method, the start method is valid.
If we are in a parent process, we verify that as many children have been created as defined in the maxThreads parameter. If this happens, we will have to wait for each child to respond before we can kill the child process.
The number of children created again after there are no more child threads is indicated by the parameter maxThreads.
Let's see how to use the methods of the classes defined above.
The class ThreadManager and the class Task are instantiated.
We use the while iterator to make sure that we get the push notifications.
When theThreadManager class reaches the maximum number of threads allowed, it will stop.
The ThreadManager class can continue to create child threads when done with these threads.
To launch this, we need to go to the terminal and execute the project files.
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I have tried to reproduce them since I didn't have a recipe. I have to confess that they have turned out very tasty, but the texture is not very good, and they have a flavor that makes them magical in China, but I have not yet been able to reproduce them here. As I ate them twice and the level and flavor of the spices was completely different in both, I thought that this could be my version of the Asian eggplant and I share it with you, but I make a point that, on my next trip to this great country, I have to convince someone local to pass me the exact recipe so that I can feel Sichuan in the dish again.
The sauce.
The sauce is too thick, but the aubergine is ready.
The sauce should be reduced in the uncovered pan after the aubergine pieces are removed.
It has to be consistency to make a good glaze. If you have decided to add water without measuring, it is probably liquid.
To make sure the sauce has a strong flavor, taste it and adjust the ingredients if necessary.
I don't have everything.
The brinjal I have eaten in Beijing and in Sichuan is very different from the one I have eaten in other places.
The base is a sauce that you can use to cook the aubergine.
Is Sichuan pepper the same as normal?
In southern China, the region of Sichuan is known for its spices.
The pepper was included. It has a pleasant flavor and is not spicy. If you use pepper that is black or white, add a dash of lime.
The fish sauce is not liquid.
Fish sauce is not like fish stock, it comes from fish. It does not taste like fish. It can be found in large supermarkets.
You can use soy sauce if you don't have.
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How to make schezwan rice?