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2018-08-30hrtime.h: fix typo in non-builtin overflow checknormal
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64592 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-08-27hrtime.h: add note explaining current use of uint64_t [ci skip]normal
[ruby-core:88678] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-08-27hrtime.h: missing parennobu
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64553 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-08-27hrtime.h: explicit casts to time_tnobu
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64552 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-08-25hrtime.h: add documentationnormal
I updated the patch with documentation but forgot about it, earlier :x [ruby-core:88616] [Misc #15014] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64535 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-08-25thread.c: use rb_hrtime_t scalar for high-resolution time operationsnormal
Relying on "struct timespec" was too annoying API-wise and used more stack space. "double" was a bit wacky w.r.t rounding in the past, so now we'll switch to using a 64-bit type. Unsigned 64-bit integer is able to give us over nearly 585 years of range with nanoseconds. This range is good enough for the Linux kernel internal time representation, so it ought to be good enough for us. This reduces the stack usage of functions while GVL is held (and thus subject to marking) on x86-64 Linux (with ppoll): rb_wait_for_single_fd 120 => 104 do_select 120 => 88 [ruby-core:88582] [Misc #15014] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64533 b2dd03c8-39d4-4d8f-98ff-823fe69b080e