Re:Show HN: Compile-time HTML parsing in C++14
by imtringued on Tuesday August 01, 2017 @07:25AM
(#14899567)
The problem is the stop the world pause. Imagine the following scenario: Thread 1 is a realtime thread and allocates memory up front and even uses @nogc for the rest of the code. Thread 2 continuously allocates memory. Thread 2 starts the garbage collector and must stop Thread 1 even though it doesn't allocate anything. Basically the only solution to the stop the world pause with D is to run two instances of your program and then use IPC even though the language provides a way to disable the gc. D's solution is to generate less garbage but it doesn't solve the real problem with current garbage collector implementations.
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Re:Show HN: Compile-time HTML parsing in C++14
by p0nce on Tuesday August 01, 2017 @10:15AM
(#14900808)
> Basically the only solution to the stop the world pause with D is to run two instances of your program and then use IPC even though the language provides a way to disable the gc.
There is a solution to your stated problem that is to deregister Thread 2 to the runtime. No registration -> no stop-the-world for this thread. Thread 2 will not be able to "own" GC things or allocate with the GC but will perfectly be able to use them. I did this in a video game for the audio thread.