What happens when a thread is blocked by a second thread?
Non-Busy Wait: If a thread tries to lock a thread that was locked by a second thread, the first thread will sleep (and not consume any CPU resources) until the second thread releases the lock. At this point, the first thread will wake up and continue execution, with the mutex locked by it.
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How are condition variables used in multi-threaded programming?
A condition variable is a mechanism that allows threads to wait (without wasting CPU cycles) until one occurs. Multiple threads can wait on a condition variable, until some other thread signals this condition variable (thereby sending a notification).
What are some examples of multi-threaded programming?
For example, consider the case where two threads try to update two variables. One tries to set both to 0 and the other tries to set both to 1. If both threads tried to do that at the same time, we could get into a situation where one variable contains 1 and another contains 0.
What are the problems of running multiple threads?
One of the basic problems when running multiple threads using the same memory space is making sure they don’t get “finger stomped”. By this we mean the problem of using a data structure from two different threads. For example, consider the case where two threads try to update two variables.
Why do we use thread-exclusive locking?
Thread Locking Exclusive thread locking ensures that one thread does not enter a critical section while another thread is in the critical section of code. If another thread tries to enter a locked code, it will wait (block) until the object is released. To achieve this functionality, we have that the main exclusive lock constructs are,
How to unlock lock owned by another thread?
Calling Process.destroyForcably() will forcibly terminate the running process. Why don’t you just wrap your thread code around the following? Then, when your thread terminates (either by terminating normally or by throwing an exception of your “kill”), it will release the lock.
What does it mean when there is a deadlock in a thread?
Using the output of these kb commands, you can find the deadlock: two threads waiting for a lock held by the other thread. In rare cases, a deadlock could be caused by more than two threads holding locks in a circular pattern, but most deadlocks involve only two threads. Here is an illustration of this procedure.