A question about `PROCESSX_INTERRUPT_INTERVAL`

[king-of-poppk]

This value is hardcoded here:

processx/src/processx.h

Line 78 in 6a16b63

#define PROCESSX_INTERRUPT_INTERVAL 200

Is my understanding correct that this interval is there only to allow the interruption of the polling and in no way adds a (significant, i.e. proportional to its value) delay to the time it takes for, let's say, p$poll_io(-1) to return?

AFAIU processx leverages native libraries to provide overhead-less IO event forwarding (modulo interruptability). See:

• UNIX:

  processx/src/processx-connection.c

  Line 1965 in 6a16b63

  ret = poll(fds, nfds, PROCESSX_INTERRUPT_INTERVAL);

  • https://man7.org/linux/man-pages/man2/poll.2.html
• Windows:

  processx/src/processx-connection.c

  Lines 1154 to 1160 in 6a16b63

  	if (selj == 0) {
  	sres = processx__thread_getstatus(&bytes, &key, &overlapped,
  	poll_timeout);
  	} else {
  	sres = processx__thread_getstatus_select(&bytes, &key, &overlapped,
  	poll_timeout);
  	}

  • processx/src/win/thread.c

    Lines 133 to 138 in 6a16b63

    	DWORD res = GetQueuedCompletionStatus(
    	iocp,
    	processx__thread_getstatus_data.lpNumberOfBytes,
    	processx__thread_getstatus_data.lpCompletionKey,
    	processx__thread_getstatus_data.lpOverlapped,
    	processx__thread_getstatus_data.dwMilliseconds);

    • https://learn.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-getqueuedcompletionstatus