NEW pipeline class#415
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On Linux, `process$get_start_time()` now returns the correct wall-clock start time. Previously it was systematically ~0.3–0.5 s too early because the boot time was read from `/proc/stat btime`, which is truncated to whole seconds. processx now derives the boot time from `CLOCK_REALTIME − CLOCK_MONOTONIC`, which has nanosecond precision. The ps package is updated in tandem to accept handles created by either the old or the new method, so new ps + old processx continues to work (#394, #402). Closes #394, closes #402.
Until the release we need to refer to the dev docs.
- Mark unix specific tests as such. - Add some platform independent tests using px.
Create pipes and processes iteratively, so the first process will not inherit the pipes of other processes, etc. Does not matter on Unix, because of CLOEXEC, but it does matter on Windows.
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New experimental
pipelineR6 class for running two or more processesconnected by kernel-level pipes, like a Unix shell pipeline
(
cmd1 | cmd2 | cmd3). Data flows directly between child processeswithout passing through R. Works on Unix and Windows (eventually).
Closes #280.