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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-06 02:15:05 +0000
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-06 02:15:05 +0000
commitfcf8c622fd3d4e288c40205bd0f745eeb5844705 (patch)
tree5c8725e44f472c5698ab71d719f241918227237a /compile.c
parent24aa7a13ca0e7dacc18c705bbbe54fe4bcf23337 (diff)
thread.c (ruby_ppoll): improve timespec to msec conversion
Round up non-zero <1ms timeouts to 1ms and use INT_MAX instead of infinite (-1) for extremely large timeouts. All of our ppoll/select callers are able to handle spurious wakeups, anyways. This avoids excessive CPU usage and busy waits with short timeouts to rb_wait_for_single_fd. CPU usage with the following script is significantly reduced for systems with "#undef HAVE_PPOLL": require 'io/wait' r, w = IO.pipe { loop { r.wait_readable(0.000001) } }.join(5) exit!(0) Low-resolution in poll(2) still sucks, though... Note: I don't see the value in making a similar change to time_timeval of a <1us sleep is attempted because of GVL release and syscall latency. git-svn-id: svn+ssh:// b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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