Robin Burchell dea7f937bf Scheduler: Allow reentry into block() ...

With the presence of signal handlers, it is possible that a thread might
be blocked multiple times. Picture for instance a signal handler using
read(), or wait() while the thread is already blocked elsewhere before
the handler is invoked.

To fix this, we turn m_blocker into a chain of handlers. Each block()
call now prepends to the list, and unblocking will only consider the
most recent (first) blocker in the chain.

Fixes #309

2019-07-21 12:42:22 +02:00

16 KiB

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