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e64cc75681
This is a follow-up to D116372, which had a rather unfortunate side effect of making the processing of a single SIGCHLD quadratic in the number of threads -- which does not matter for simple applications, but can get really bad for applications with thousands of threads. This patch fixes the problem by implementing the other possibility mentioned in the first patch -- doing waitpid(-1) centrally and then routing the events to the correct process instance. The "uncollected" threads are held in the process factory class -- which I've renamed to Manager for this purpose, as it now does more than creating processes. Differential Revision: https://reviews.llvm.org/D146977