what is mutex?
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Answer / rock star
Mutual exclusion (often abbreviated to mutex) algorithms are
used in concurrent programming to avoid the simultaneous use
of a common resource, such as a global variable, by pieces
of computer code called critical sections.
Examples of such resources are fine-grained flags, counters
or queues, used to communicate between code that runs
concurrently, such as an application and its interrupt
handlers. The problem is acute because a thread can be
stopped or started at any time.
To illustrate: suppose a section of code is mutating a piece
of data over several program steps, when another thread,
perhaps triggered by some unpredictable event, starts
executing. If this second thread reads from the same piece
of data, the data, in the process of being overwritten, is
in an inconsistent and unpredictable state. If the second
thread tries overwriting that data, the ensuing state will
probably be unrecoverable. These critical sections of code
accessing shared data must therefore be protected, so that
other processes which read from or write to the chunk of
data are excluded from running.
A mutex is also a common name for a program object that
negotiates mutual exclusion among threads, also called a lock.
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Answer / nadeem khokhar
A mutex and the binary semaphore are essentially the same. Both can take values: 0 or 1. However, there is a significant difference between them that makes mutexes more efficient than binary semaphores.
A mutex can be unlocked only by the thread that locked it.
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Answer / sunildummati
Short for mutual exclusion object. In computer
programming, a mutex is a program object that allows
multiple program threads to share the same resource, such
as file access, but not simultaneously. When a program is
started, a mutex is created with a unique name. After this
stage, any thread that needs the resource must lock the
mutex from other threads while it is using the resource.
The mutex is set to unlock when the data is no longer
needed or the routine is finished.
(2) When spelled MuTeX, a package of macros for the TeX
typesetting system that supports musical notation. MuTeX
was written by Andrea Steinbach and Angelika Schofer, as a
master's thesis at Rheinische Friedrich-Wilhelms
University.
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Answer / rajesh verma
A Mutex is a mutually exclusive flag. It acts as a gate keeper to a section of code allowing one thread in and blocking access to all others. This ensures that the code being controled will only be hit by a single read at a time. Just be sure to release the mutex when you are
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