From the course: Parallel and Concurrent Programming with C++ Part 2
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Latch: C++ demo - C++ Tutorial
From the course: Parallel and Concurrent Programming with C++ Part 2
Latch: C++ demo
- [Instructor] In addition to barriers to control the order of execution, there's another related synchronization mechanism called a latch. This allows one or more threads to wait until a set of operations being performed in other threads to complete. The latch is initialized with a given count value, which threads can use in two ways. Threads can either wait at a latch until the count value reaches zero, much like how threads can wait at a barrier, or they can decrement the count value by calling the latch's count_down function. So, the key difference between a latch and a barrier is that the barrier releases when a certain number of threads waiting on it has been reached, whereas the latch releases after the count_down function gets called enough times to reduce the count value to zero. For this demonstration, we'll modify the previous example code that used a barrier to now use a latch instead. First, we'll change the…
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