Threads and Thread Handing

Threads and Thread Handling Course
Hello everyone. This is Threads and Thread Handling course. In this course you will learn about all the components and modules of linux Threads and Threads handling. You will learn that what are Threads and how the threads are created an managed in linux and Unix system.


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OUTLINE

  1. Threads overview 00:49
    2. Threads creation, Thread termination, Thread ID’s 6:28
    3. Threads vs processes 13:09
    4. Mutexes 17:20
    5. Signaling changes of State: Condition variables 24:14
    6. One time initialization 31:46
    7. Thread specific data 35:47
    8. Canceling a Thread 44:45
    9. Testing for Thread cancellation 49:33
    10. Linux implementation of POSIX Threads 51:26

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Threads and Thread Handing

Hand Sanitizer in bulk - Get your effective hand sanitizer here

With the spread of various harmful virus globally causing immense distress and fatalities to human mankind, it has become absolutely essential for people to ensure proper and acute hygiene and cleanliness is maintained. To further add to the perennial hardship to save lives of people the recent pandemic of Covid-19 affected globally created the worst nightmare for people of all walks of life. Looking at the present crisis, it has become imperative for human beings to be encouraged to tackle this challenge with an everlasting strength to help protect oneself and their loved ones against the devastating effects of the virus. One thing that stands up between keeping all safe and vulnerable is by making sure that everybody attentively Hand wash periodically to help physically remove germs from the skin and getting rid of the live microbes.

The essence of apposite handwashing is based around time invested in washing and the amount of soap and water used. Technically, washing hands without soap is much less effective anyway. But incase a proper handwashing support system doesn’t become possible around, the usage of Effective Hand Sanitizer will certainly help fight to reduce the number of microbes on the surface of hands efficiently, eliminating most variants of harmful bacteria to settle.

The need has come about for Hand Sanitizer in bulk to save your daily life aptly maintaining a minimum of 60% alcohol - as per the CDC recommendations and approved by USFDA for its greater effectiveness. With the growing demand of people on the move the demand for easy to carry, small, and travel size worthy pouches that are also refillable once the product runs out is the need of the hour. To further make sure that human lives are well protected from these external viruses, it is mandatory for producer of effective Hand Sanitizer to evolve products circumspectly with ingredients that produce not just saving lives but with multiple benefits for people of all ages.

#hand sanitizer #hand sanitizer in bulk #hand sanitizer ingredient #hand sanitizer to alcohol #hand sanitizer travel size #hand sanitizer wholesale

Frank Xu

1625038259

Thread Gauge Calibration - What Should You Know?

If you are using thread gauges or thread ring gauges you would have already heard about calibration. If you do not pay attention to thread gauge calibration then the integrity of the thread gauges you are purchasing and using could be compromised. In case you do not know what is thread gauge calibration and what is its significance then here are a few important factors that you should know about calibration.

When you order a custom trapezoidal thread gauge or a custom Whitworth thread gauge or for that matter any thread gauge, how will you know that it is exactly matching your requirements and specifications? As you know the thread gauges are inspection tools and unless they are 100% accurate there is no use having a thread gauge. When you calibrate the thread gauge you will know whether or not the tool is true to its specifications and whether it matches the required specifications 100%.

It is important to get calibration certificate along with your thread gauge when ever you are purchasing your thread gauge. All the manufacturers will arrange for a third party calibration certificate if you inform them early enough while placing your order. This may have an additional cost but you cannot avoid this cost because without having the confirmation that your thread gauge is delivered as per your requirements, you cannot confidently check the components that need to be inspected with your thread gauges. If there is any issue with the thread gauge you will think that there is something wrong with the threaded components. As a result, you would keep rejecting those components when the actual issue is with the thread gauge you are using. All such issues and mistakes could be avoided or minimized when you go for a calibration certificate when you are buying your thread gauges.

You may need to go for recalibration every time you repair your thread gauge or make any modifications to it. In case you are experiencing sudden episode of issues with your threaded components then it is best to first check the thread gauges you are using to ensure that the problem is not with the thread gauge.

It is also important to get a calibration certificate for your thread gauge if the tool has been dropped or if someone that is not trained properly use the thread gauge and exerts undue force. In other words, whenever you suspect that the thread gauge could have been damaged then it is vital go check the thread gauge and calibrate it so that you can be sure of the accuracy of the thread gauge.

Always source all your thread gauges from the most trusted companies. Whenever you are calibrating your thread gauge get it done from a reputed calibration center. You cannot afford to have a faulty thread gauge as it is an inspection tool, a standard that is used to measure the accuracy of the other tools. Therefore, make sure that your thread gauges are always well maintained and regularly calibrated.

#trapezoidal thread gauge #thread gauges #thread ring gauges #thread plug gauges #metric thread gauges #unef thread gages

Seamus  Quitzon

Seamus Quitzon

1604020089

What Are Garbage Collection Logs, Thread Dumps, and Heap Dumps?

Java Virtual Machine (JVM) generates 3 critical artifacts that are useful for optimizing the performance and troubleshooting production problems. Those artifacts are:

  1. Garbage collection (GC) log
  2. Thread Dump
  3. Heap Dump

In this article, let’s try to understand these 3 critical artifacts, where to use them, how do they look, how to capture them, how to analyze them, and their differences.

1. Garbage Collection Log

a) What Is a GC Log?

GC Log contains garbage collection events related information. It will indicate how many GC events ran, what type of GC events they are (i.e. Young GC or Full GC), how long each GC event pause the application, how much objects did each GC event reclaim.

b) What Does a GC Log Look Like?

Sample garbage collection log file can be found here. 

c) Where Are GC Logs Used?

Garbage collection logs are used to study the application’s GC and memory performance. It’s used to optimize the GC pause times, it’s used to identify optimal memory size for your application, it’s also used to troubleshoot memory-related problems.

d) How to Generate a GC Log?

You can generate garbage collection logs by passing the following JVM arguments:

For Java versions until 8:

Java

xxxxxxxxxx

1

1

-XX:+PrintGCDetails

2

-XX:+PrintGCDateStamps

3

-Xloggc:<file-path>

#threading #heap dump #java threads #thread dump #garbage collection in java #heap dump analysis #java gc #garbage collectors #jvm arguments #gc log

How A Java Program Is Executed? – Heap, Threads, Stack, GC [Video]

What happens behind the scene when a Java program is executed? What is the difference between Stack and Heap? Watch this video to know more.

What happens behind the scene when a Java program is executed? In which regions objects are created? When objects become eligible for garbage collection? Where are threads stored? What is the difference between Stack and Heap? Watch this video to know more.

#stack #garbage collector #heap dump #thread dump #memory analysis #java program #gc logs #garbage collcetion #thread class in java #thread memory

Kole  Haag

Kole Haag

1602838800

Why I Feel Go Threading Is Better, Though With Some Limitations

Kernel Scheduling Entity

Before jumping into the threading model. Let’s understand the kernel scheduling entity. For any kernel, the scheduling entity could be a process or thread. Some kernels are not multi-threaded, the scheduling entity will be processed. Most of the recent kernels are multi-threaded. This helped in general for someone implementing threading in userspace vs depending on kernel threading.

Different Thread Models

There are three different threading models we can see Mx1, 1x1, MxN

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Different Threading Models

Mx1 — There are two different possible operating systems, where scheduling entity for kernel is a process or a thread. Either case one would have implemented Mx1 threading model in userspace.

In this implementation, kernel is not aware of any of the user threads. a scheduled user thread maps to kernel thread/process based on the scheduling entity in kernel. So there is only one thread/process in kernel which is serving the user-space scheduler.

The main advantage of this mechanism is that it will not create much load on the kernel.

The main disadvantage with this approach is and depends on the way userspace scheduler is implemented, if a thread within the process blocks since the underlying kernel scheduling entity does not know about other user threads, it will block the entire process. So, even there are some schedulable threads in user space, it cannot schedule them.

Some implementations take care of it by creating another thread and schedule runnable user-space threads. But most of the implementations do not do this.

1x1 — In this mechanism, there is one to one mapping for the user-space threads to kernel threads. POSIX threads implemented in Linux use 1x1 model.

The main advantage of this mechanism is userspace scheduler is simplified since it completely depends on kernel scheduling.

The main disadvantage is that it generates too much load on the kernel. A process could have thousands of threads and causes kernel to create that many threads.

#golang #go #threads #golang-tutorial #threading