what mutex lock

Differences between semaphore and mutex: ScopeSemaphore: process or thread (Linux only)Mutex lock: between threads LockSemaphores: as long as the semaphores value is greater than 0, other threads can successfully sem_wait, And the semaphores value

  Study overview this week ● System call ● Standard I/O Library ● Process Control ● Inter-process communication: pipelines, named pipelines, and message queues ● Basic signal operations ● Basic thread operations   The details are as follows: ●

Linux multithreading 1. thread Overview a thread is a basic scheduling unit in a process, also known as a lightweight process. Threads are concurrent multi-path execution paths in the shared memory space. they share the resources of a process, such

I. INTRODUCTION in modern operating systems, multiple kernel execution streams may be executed at the same time. therefore, like multi-process and multi-thread programming, the kernel also needs some synchronization mechanisms to synchronize the

● Mutex lock The mutex lock is used to ensure that only one thread is executing a code segment (critical section) within the same time period ). The most vulnerable to multi-threaded programming is the definition and access of critical zones.Control.

This article describes in detail the synchronization mechanism in Linux kernel: Atomic operations, semaphores, read/write semaphores and spin locks APIs, usage requirements and some typical examples. I. Introduction In modern operating systems,

The following code is my writing method: Static bool alive = true; Static int count = 0; Pthread_mutex_t mutex; Pthread_cond_t cond; Void producer () { Pthread_mutex_lock (& mutex); // Add a mutex lock //... Do something here, queue. insert ()... or

Linux multithreading   1. Thread Overview A thread is a basic scheduling unit in a process, also known as a lightweight process. Threads are concurrent multi-path execution paths in the shared memory space. They share the resources of a process,

I. Introduction In modern operating systems, Multiple kernel execution streams may be executed at the same time, therefore, like multi-process and multi-thread programming, the kernel also needs some Synchronous Machine mechanisms to synchronize

I recently studied. Net distributed cache code, which involves lock. I read some articles on the Internet and summarized some lock-related knowledge for your reference. I. Lock Definition The lock keyword can be used to ensure that the code block is

Java support for the management process, Java Management Process Concept of management process   A process (Moniters, also known as a monitor) is a program structure. Multiple working threads in the structure form multiple subprograms (objects or

First, the msdn definition is given: The lock keyword can be used to ensureCodeThe block is running without beingOthersThread interruption. This is achieved by obtaining mutex locks for a given object during the code block operation. Let's take

Read/write lock Index: Initialize a read/write lock pthread_rwlock_init Read lock pthread_rwlock_rdlock Non-blocking read lock pthread_rwlock_tryrdlock Write lock read/write lock pthread_rwlock_wrlock Non-blocking write lock

This article from: http://zh.wikipedia.org/wiki/%E5%8F%AF%E9%87%8D%E5%85%A5 If a program or subroutine can be safely executed in parallel (parallelComputing) ", it is calledReentrant(Reentrant or re-entrant. That is, when the subroutine is running,

  POSIX thread: A completed thread/process consists of three parts: code + Data + Memory stack. When a sub-thread and sub-process are created, For fork () to create a sub-process, make a copy of all three parts, including the file descriptor,

IOS development-thread security for multi-threaded Development A resource may be shared by multiple threads, that is, multiple threads may access the same resource, for example, multiple threads access the same object, the same variable, the same

Multithreading basics in iOS developmentTime-consuming operation drill code walkthrough compilation time-consuming Method - (void)longOperation { for (int i = 0; i Call the time-consuming method directly // 1> directly call the time-consuming

This article only describes the role and understanding of the condition variable pthread_cond_t. The function has been provided in other articles. An obvious disadvantage of mutex is that it has only two States: Locked and non-locked. Conditional

http://blog.csdn.net/tq02h2a/article/details/4317211Look at the Linux 2.6 kernel source, the following code to analyze the X86 architecture, the implementation of mutual exclusion lock principle.Code Analysis1. First describe the data structure used

In this section, we describe the lock-related APIs provided in the go language. This includes mutexes and read-write locks. We described the mutex in the 6th chapter, but did not mention the read-write lock. Both of these locks are very common and