Carsten Haitzler d19e435ff9 reduce syscalls on opening files - roll CLOEXEC into open ... on linux open supports() O_CLOEXEC. add test case for this in meson build and ifdef. this rolls 3 syscalls into 1 as we were doing open, then fnctl to get and fcntl to set flags. less syscalls is a good thing as syscalls are not cheap on some architectures or systems. I've seen a syscall on 1 system take 2-3x as long as another and another syscall in the same 2 system comparison take 10x as long. depending on the syscall you may only have a budget of something like 5000 syscalls "per frame" (60fps) before you spend all of your frame time just in syscalls not doing any processing, so we should keep these down if possible and that is what this does.		2019-07-26 11:43:17 +01:00
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meson.build	reduce syscalls on opening files - roll CLOEXEC into open	2019-07-26 11:43:17 +01:00