Ariel Abreu 7f02040c47 Implement Mach port kqueue channels + a few more things ... Mach port kqchannels allow libkqueue to listen in on Mach port events that happen on the server side. The implementation consists of a socket pair used to communicate between the client and the server for that particular channel. When the server receives an event, it sends a notification message on the socket, which makes the socket readable to the client and thus wakes up epoll. When the client is ready to read the event, it sends a message to the server asking it to read the event and send back the necessary data. This is done this way (rather than proactively sending the event data over the socket) to closely mimic the actual process that kevent does when reading events. This is even more important when the client specifies MACH_MSG_RECEIVE, which asks the server to try to receive the message directly into a buffer (if there is enough space) when reading the event. In that case, we would *definitely* not want to read the Mach message before the client is actually ready to do so, as it could starve others from reading the Mach message while the client hasn't even acknowledged the event yet--or worse, the client could have died before reading our event and that message is now lost forever. In other news, many different parts of the code have been updated to function properly now. For example, all of the direct Mach traps can call thread_syscall_return now. This allows things like semaphores to work. Timers (with timer_call) are also working now and have been tested in conjunction with timed semaphore waits. Threads are now able to impersonate other threads for the purposes of running duct-taped code. The primary use case for this is for running code in a kernel microthread but pretending to be user microthread (e.g. kqchan does this). This makes current_map() and friends return the information for the thread we're impersonating (useful for e.g. copyout).		2022-02-10 13:57:21 -05:00
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generate-rpc-wrappers.py	Implement Mach port kqueue channels + a few more things	2022-02-10 13:57:21 -05:00