sync.RWMutex Version: go1.20.3 darwin/arm64 There are four scenes below How to prevent write operations? Add mutex lock directly How do write operations prevent read operations? RWMutex.readerCount is an integer value used to represent the number of readers. Regardless of write operations, the value is + 1 for each read lock and – 1 for each […]
Tag: mutex
Mutex locks, condition variables, semaphores and applicable scenarios
Article directory mutex lock Commonly used methods in the actual combat of mutex locks condition variable Commonly used methods in the actual combat process of condition variables signal Common methods of semaphores producer and consumer issues A rough version of the producer-consumer code (if only mutexes were used) An improved version of the producer-consumer code […]
golang sync.Mutex interpretation
Golang sync.Mutex interpretation The structure definition of Mutex is as follows: type Mutex struct {<!– –> state int32 sema uint32 } const ( mutexLocked = 1 << iota // mutex is locked mutexWoken mutexStarving mutexWaiterShift = iota starvationThresholdNs = 1e6 ) mutexLocked: The value is 1, and the first bit is 1, indicating that mutex […]
[c++] Lock mechanism: mutex and condition_variable description and sample code
Lock mechanism description mutex mutex lock Used to protect resources under multi-threading. Only one thread can read and write at the same time. std::mutex is the mutex lock (Mutex) class provided in the C++ standard library, which is used to implement mutually exclusive access between multiple threads. It provides two main operations: lock() and unlock(). […]
[Common c/c++] Producer-consumer model using mutex/cv/semaphore
Foreword: The producer-consumer model is a commonplace topic, and there are various implementation methods. The operating efficiency of different methods is also very different. It is difficult to balance factors such as code simplicity, data security, operational stability, and operational performance. Basic model -> Large-granularity lock + busy waiting (high efficiency, high CPU) Component: mutex […]
Go coroutines: channels/channels, mutexes, and read-write locks
Directory channel/channel 1. Definition and use of channels 2. Channel capacity and length 3. Two-way channel and one-way channel bidirectional channel one-way channel 4. Traverse the channel (Fibonacci sequence effect) 5. Use channels as locks 6 Is channel transfer a deep copy? 7 things to note 8 Classic error cases of channel deadlock 1 Unbuffered […]
Dark Horse Comments-07 Cache breakdown problem (hotspot key failure) and solution, mutex lock and setting logical expiration time
Cache breakdown problem (hotspot key invalidation) The cache breakdown problem is also called the hot key problem. It means that a key that is accessed by highly concurrently and has a complicated cache rebuilding business suddenly fails. At this time, countless requests and accesses will hit the database in an instant. , brings huge impact […]
kdump+crash solves the sleep lock (mutex) deadlock problem
Table of Contents 1. Experiment purpose: Use crash to solve the dormant lock (mutex) deadlock problem 2. Experimental steps 3. Brief description of hung task mechanism 4. Analysis of mutex deadlock problem 4.1. Confirm deadlock thread 4.1.1. Use the ps | grep UN command to determine the D state thread in the crash, and use […]
Embedded Linux application development – driver collection – synchronization and mutual exclusion ④ implementation of spin lock/semaphore/mutex
Embedded Linux application development-driver collection-synchronization and mutual exclusion ④ implementation of spin lock/semaphore/mutex Chapter 1 Synchronization and Mutual Exclusion④ 1.5 Implementation of spinlock spinlock 1.5.1 Spin lock kernel structure 1.5.2 Implementation of spinlock in UP system 1.5.3 Implementation of spinlock in SMP system 1.6 Implementation of semaphore 1.6.1 Kernel structure of semaphore 1.6.2 Implementation of […]
14|Standard library: How to use technologies such as mutexes to coordinate thread running?
In the previous lecture, we mainly introduced some basic knowledge about concurrent programming, and showed through a simple example how to perform basic operations such as thread creation in C language. It also introduces how factors such as data competition, race conditions, and instruction rearrangement affect the execution correctness of multi-threaded applications. So, what methods […]