There are several types of linux thread locks

There are three main types of Linux thread locks: 1. Mutex locks, which are simple to implement and can be used to control mutually exclusive access to shared resources and prevent multiple threads from accessing the same piece of code or data at the same time; 2. Auto Spin lock is simple to implement and is suitable for situations where the critical section is very short. Process context switching is not performed, so it can improve the concurrency performance of multi-processor systems. 3. Read-write lock is suitable for scenarios where there is more reading and less writing, and can improve Concurrency performance in multiprocessor systems.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, thread locks mainly include the following types:

1. Mutex lock (Mutex)

- Advantages: Simple implementation, can be used to control mutually exclusive access to shared resources, and can prevent multiple threads from accessing the same piece of code or data at the same time.

- Disadvantages: Locking and unlocking require system overhead and can easily cause problems such as deadlock and starvation.

- Usage method: Initialize the lock through the pthread_mutex_init function, use the pthread_mutex_lock function to obtain the lock before accessing the shared resource, and use the pthread_mutex_unlock function to release the lock after the access is completed.

2. Spinlock

- Advantages: Simple to implement, suitable for critical applications When the area is very short, process context switching will not be performed, thus improving the concurrency performance of multi-processor systems.

- Disadvantages: It cannot prevent the process from sleeping and may continue to occupy CPU resources, resulting in a decrease in system efficiency.

- Usage method: Initialize the lock through the pthread_spin_init function, and use the pthread_spin_lock function to acquire the lock before accessing the shared resource (if the lock has been acquired by other threads, the current thread will be blocked). After the access is completed Use the pthread_spin_unlock function to release the lock.

3. Reader-Writer Lock

- Advantages: Suitable for reading The scenario of writing more and less can improve the concurrency performance of multi-processor systems.

- Disadvantages: The implementation is relatively complex and can easily cause priority inversion and starvation problems. Improper use may cause race conditions between threads and other problems.

- How to use: Initialize the lock through the pthread_rwlock_init function. Before accessing the shared resource, you can use the pthread_rwlock_rdlock function to obtain the read lock (multiple threads can hold the read lock at the same time), or you can use pthread_rwlock_wrlock to obtain the write

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