mutex in A Sentence

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    Ii Mutex is lightweight and faster than semaphore.

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    2

    A Mutex is analogous to a single key to a room.

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    3

    Locking the Mutex ensures that access from different threads will be serialized.

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    4

    A Mutex can be implemented using a Semaphore but not the other way around.

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    5

    Mutex are used for" Locking Mechanisms". one process at a time can use a shared resource.

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    6

    It means there is ownership associated with Mutex, and only the owner can release the lock(Mutex).

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    7

    It could also be a real problem for the people trying to write the Mutex library.

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    8

    It means there will be ownership associated with Mutex, and only the owner can release the lock(Mutex).

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    9

    No one owns semaphores, whereas Mutex are owned and the owner is held responsible for them.

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    10

    The problem before was that there was not such thing as a Mutex(in terms of the C++ standard).

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    11

    If the mutual exclusion object doesn't have ownership then, irrelevant of what it is called, it is not a Mutex.

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    12

    You obviously use Mutex to lock a data in one thread getting accessed by another thread at the same time.

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    13

    The rebalance operation can affect large portions of the tree, which would require a Mutex lock on many of the tree nodes.

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    14

    When we have finished executing our protected code(known as a critical section) we just set the Mutex value to zero or whatever means'clear.'.

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    15

    The QMutexLocker class automatically locks the Mutex in its constructor and unlocks it when the destructor is invoked, at the end of the function.

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    16

    The Mutex data member is declared with the mutable qualifier because we need to lock and unlock the Mutex in value(), which is a const function.

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    17

    As such one can see a Mutex as a token passed from task to tasks and a semaphore as traffic red-light(it signals someone that it can proceed).

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    18

    You would only use a spinlock on a multi-processor box because on a single processor the process holding the Mutex will never reset it while another task is running.

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    19

    If a thread which had already locked a Mutex, tries to lock the Mutex again, it will enter into the waiting list of that Mutex, which results in deadlock.

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    20

    So the only guarantees you were provided were by the Mutex manufacturer, which was fine as long as you did not port the code(as minor changes to guarantees are hard to spot).

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    21

    Mutex can be released only by thread that had acquired it, while you can signal semaphore from any other thread(or process), so semaphores are more suitable for some synchronization problems like producer-consumer.

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    22

    A Mutex object only allows one thread into a controlled section, forcing other threads which attempt to gain access to that section to wait until the first thread has exited from that section.

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    23

    Do you at any cost allow yet another thread to just unlock the same Mutex, and in turn, allow the thread that is already waiting(blocking) in the Mutex lock to unblock and access the data?

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    24

    In this case, you are still in the process of accessing the data and you may take, say, another 15 secs to reach the Mutex unlock(so that the other thread that is getting blocked in Mutex lock would unblock and would allow the control to access the data).

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