PDF Multitool for Windows – Free desktop app to extract PDF, edit, split & merge & more.Free Desktop Apps – PDF Multitool, Barcode Reader & Generator, Watermarking, XLS Viewer & more (for end-users).Blog for Developers – Guides for programmers, tech trends, software reviews, useful tools and lists.ByteScout Academy – Online video courses for programmers. ![]() Free Licenses – Free unlimited licenses for research projects.We Fight Against COVID-19 – Free licenses for projects fighting against COVID-19.We Fight Against Cancer – Free licenses for projects fighting against Cancer.Whitepapers – ByteScout SDK use cases by industry.Solutions – Healthcare, Insurance, Banking & Finance, POS, ETL, Logistics, Education & more.Testimonials – Feedback from our customers.Contacts – Company contacts & knowledge base.About Us – Our mission, products & solutions, why choose ByteScout.(self-hosted cloud) API Server – Secure and scalable REST API server that you can install on-premises.Sensitive Data Suite – Detect, Remove, Analyze Your Documents for Sensitive Data and PII.PDF Suite – Create, convert and view PDF, extract data from PDF in your desktop or web applications.Data Extraction Suite – Extract data from documents, PDF, images, Excel on your desktop or web applications.Barcode Suite – Generate, read, display and print barcodes in your applications.Premium Suite – Includes PDF Extractor, PDF Viewer, PDF Renderer, PDF Generator, PDF to HTML, PDF Generator for JS.Text Recognition SDK – Extract and recognize any text from scanned PDF documents or image.Spreadsheet SDK – Read & write from/to XLS, XLSX, CSV files.Barcode Generator SDK – Create 1D and 2D barcodes.Barcode Reader SDK – Read 1D and 2D barcodes from image and PDF files.PDF Renderer SDK – Convert PDF to PNG, JPG, TIFF, BMP, EMF formats.PDF to HTML SDK – Convert PDF to HTML with layout preserved.PDF (Generator) SDK – Create & edit PDF in C#, VB.NET, convert DOC, HTML to PDF.PDF Extractor SDK – Extract PDF to Excel, CSV, JSON, Text, XML, extract images from PDF. ![]() With mutex objects, other threads who want to access the resource have to wait in a queue, until the current thread is finished using the resource. A mutex object only allows a single thread to consume a resource or a critical section, whereas semaphores allow a restricted number of simultaneous accesses to a resource (under a maximum allowed number). What is the difference between Semaphore and Mutex?Įven though, both the semaphores and mutex objects are used to achieve mutual exclusion in parallel programming environments, they have some differences. But internally only a single thread is accessing the resource at a given time. Practically, when the mutex alternates the access to a resource between several threads, it will be visible as multiple threads are consuming a resource at the same time. If there are multiple threads waiting in the queue, they are given access in a rotating basis. When the first thread is finished with the resource, lock will be removed and the thread that is waiting in the queue can get access to the resource. Then that thread will be placed in a queue until the first thread is finished with the resource. ![]() If another thread wants to use the same resource, it will have to make a request. When the resource is used by a thread, it is locked and other threads cannot use it. When a computer application is started, it will create a mutex and attach it to a resource. Mutex semaphores allow a single access to a resource and counting semaphores allow multiple threads to access a resource (which has several units available). There are two types of semaphores called mutex semaphores and counting semaphores. The signal operation opens a semaphore and if there is a thread already waiting in the queue, that process is allowed to proceed and if there are no threads waiting in the queue the signal is remembered for the next threads. If the semaphore is closed when the wait operation is called by a thread, the thread is blocked and it has to wait in the queue. When the wait operation is called by a thread, if the semaphore is open, the thread can continue. Each semaphore is associated with a queue of waiting processes. The wait operation blocks a process until the semaphore is open and the signal operation allows another process (thread) to enter. Semaphores mainly support two operations called wait (historically known as P) and signal (historically known as V). Semaphore is a data structure that is used to provide mutual exclusion to critical sections. Mutex (Mutual Exclusion Object) is also used to avoid access to a common resource at the same time by several concurrent processes. Semaphores are used to avoid dead locks and race conditions. Semaphore is a data structure that is used to make sure that multiple processes do not access a common resource or a critical section at the same time, in parallel programming environments.
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