[Multiprocess & Multithreading] Basic methods and usage insights record_Based on python3
[Note:] DataFrame.values returns numpy.array(a);If you want to add train_df_list += a;Need to convert a.tolist()!!! Zero, Introduction 0.1 Preface Many errors have been made in using multiprocesses and multithreads;I also learned a lot of basic techniques. For debugging convenience and no more UTF-8...
Posted by melissal on Fri, 21 May 2021 01:44:53 +0930
Qt process communication (shared memory) complete code
Create a new Qt Widgets project, select QDialog as the base class, and the class name is Dialog. After completion, enter the interface file. ui file, and put two push Button parts and a Label part in the interface. Change the display text of one button to "load picture from file", and the displUTF-8...
Posted by Dixsta on Sat, 29 May 2021 03:19:56 +0930
Interprocess communication
Interprocess communication Nameless pipe Anonymous pipeline can only inherit, create pipeline in process, one process writes data, one process reads data. 1. Characteristics (1) It can only be used for inter process communication with kinship (no actual file corresponding to it); (2) Simplex coUTF-8...
Posted by greggustin on Tue, 13 Jul 2021 02:54:40 +0930
Concurrent programming in python
Concurrent programming in python (I) 1. Description of threads and processes Thread is the unit of real work, and process is the unit that provides resources for thread. Analogy: A factory has at least one workshop, at least one worker in a workshop, and finally the workers are working.A prograUTF-8...
Posted by rlindauer on Fri, 17 Dec 2021 22:59:29 +1030
python multitasking 02- id of main process and child process and guardian process
1 get process id When we run the py file, the operation of the program is a process. If other processes are created in the process, the process is the main process and the other processes created are sub processes. Next, we verify this relationship by printing the IDs of the current process anUTF-8...
Posted by Htmlwiz on Wed, 22 Dec 2021 22:43:23 +1030
Multithreading Foundation
1 process and thread Process: a process is a dynamic execution process of a program. It has experienced a complete process from code loading, execution to execution. This process is also the process of the process itself from generation, development to extinctionProcess: the program being execuUTF-8...
Posted by SirChick on Fri, 28 Jan 2022 08:53:25 +1030
Linux system programming - daemon
1, Preparatory work Group 1. Process Process group is a collection of one or more processes. Each process belongs to a process group. The introduction of process group is to simplify the management of processes.When a parent process creates a child process, the child process and the parent procUTF-8...
Posted by sloshire1 on Wed, 02 Feb 2022 14:01:07 +1030
Linux multiprocess programming
fork system call #include #include /* Clone the calling process, creating an exact copy. Return -1 for errors, 0 to the new process, and the process ID of the new process to the old process. */ extern __pid_t fork (void) __THROWNL; Each call of this function returns twiUTF-8...
Posted by jboku on Thu, 03 Feb 2022 20:44:47 +1030
"Python learning notes" Python realizes concurrent programming
Python implements concurrent programming I Knowledge points of concurrent programming 1.1. Why introduce concurrent programming Scenario 1: a web crawler, which takes 1 hour to crawl in order, uses concurrent download to reduce it to 20 minutes!Scenario 2: for an APP application, it takes 3 secUTF-8...
Posted by cnl83 on Sun, 06 Mar 2022 23:50:38 +1030
Learn Android Binder (XI) binder thread pool from simple to deep
Android Binder series: Learn Android Binder (I) - AIDL from simple to deep Learn Android Binder (II) - bindService process from simple to deep From simple to deep learning Android Binder (III) - deep study of java binder (from java to native) Learn Android Binder from simple to deep (IV) - ibinUTF-8...
Posted by silvercover on Thu, 31 Mar 2022 12:01:40 +1030