Semaphore and Mutex are two critical resources in the realm of computer science and operating systems, providing vital synchronization services. This article will delve into the major contrasts between semaphore and mutex.
For a more comprehensive understanding of these topics, you can refer to the
GATE syllabus for CSE
.
Defining Semaphore
A semaphore, in computer programming, is a shared abstract data type or integral variable utilized across multiple methods. Its primary usage is to synchronize processes and control access to a resource within a common programming environment.
Defining Mutex
Mutex, short for Mutual Exclusion Object, is a resource used to protect shared resources from being concurrently accessed by multiple threads.
Comparing Semaphore and Mutex
S.No.
Semaphore
Mutex
1
Operates through a signalling mechanism.
Operates through a locking mechanism.
2
It is an integer variable.
It is an object.
3
Semaphores can handle multiple program threads.
Mutex can also handle multiple threads, but not simultaneously.
4
Semaphores can be either counting or binary.
Mutex doesn't have any subtypes.
5
The value can be manipulated using wait () and signal () operations.
Mutex objects are simply locked or unlocked.
6
Both wait and signal operations can modify a semaphore.
Mutex objects can only be modified by the method that releases a resource.
7
Any method obtaining or releasing the resource can alter the value.
The lock on the object can only be released by the method that acquired it.
A semaphore is an integral variable or an abstract data type shared among numerous methods. The foremost objective of using semaphore is process synchronisation and access control for a resource in a similar programming environment.
What is Mutex in computer programming?
Mutex, or Mutual Exclusion Object, is used to guard a shared resource from concurrent access by multiple threads.
What are the key differences between Semaphore and Mutex?
Some key differences include that Semaphore follows a signalling mechanism while Mutex uses a locking mechanism; Semaphore is an integer variable, while Mutex is an object; Semaphore allows for numerous program threads, while Mutex allows numerous threads but not concurrently.