From 1918ad2ae38aa32c74b558b322479a8efdd76363 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Fri, 11 Dec 2020 14:49:17 -0800 Subject: Export of internal Abseil changes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit -- 0bfa836596a9c787a2f0bdc283011dd1f6810c6e by Benjamin Barenblat : Ignore missing CPU frequency on more architectures Linux on MIPS, PA-RISC, RISC-V, and SystemZ doesn’t expose the nominal CPU frequency via /sys, so don’t worry if `NominalCPUFrequency` returns 1.0 on those platforms. Some POWER machines expose the CPU frequency; others do not. Since we can’t predict which type of machine the tests will run on, simply disable testing for `NominalCPUFrequency` on POWER. PiperOrigin-RevId: 347079873 -- 492b6834ed4a07cbc3abccd846f7e37d8c556ee5 by Benjamin Barenblat : Use ABSL_HAVE_THREAD_LOCAL macro instead of copying code Reduce code duplication by checking the ABSL_HAVE_THREAD_LOCAL macro instead of copying code from base/config.h. PiperOrigin-RevId: 347079561 -- 8d656efce4da9cb032094377e58493d98427a536 by Abseil Team : Rollback PiperOrigin-RevId: 347078779 -- 221bc69ec6dd7e2777ffcff6942584f979ef6382 by Abseil Team : Add flag for 'shallow subcord' feature for experimental ring buffer rollout There is a potential trade-off of CPU cost vs over-sharing cord data for subcord of large cords. This flag allows making subcords shallow for ringbuffers (with a potential larger waste of referenced source cords), which allows us to make subcord fast for this apps that do no persist (unmodified / plain copied) sub cords. This change also introduces constants for the default settings, intended to keep the internal cord settings concistent with external flags. PiperOrigin-RevId: 347053271 -- 00a56c24293566734009f6bf2169a83fb37a35ba by Abseil Team : Revert the usage of variant<> in Cord iterator and reader. The introduction of the variant may lead to some missed compiler optimizations. PiperOrigin-RevId: 347053041 -- c7b7b5ed7e3ab46b1e75b80f1a7de0bda26c8f70 by Chris Kennelly : Release library for integer power-of-2 functions and bit counting. PiperOrigin-RevId: 347035065 -- 5a035c0d9840b251967f9e7039fc6a4e01dd52f3 by Abseil Team : Restructure Cord::ChunkIterator for future ring buffer support. PiperOrigin-RevId: 346890054 GitOrigin-RevId: 0bfa836596a9c787a2f0bdc283011dd1f6810c6e Change-Id: I3a58e2a44cb4c6f2116c43e2a4ccbc319d3ccecf --- absl/strings/internal/cord_internal.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'absl/strings/internal/cord_internal.h') diff --git a/absl/strings/internal/cord_internal.h b/absl/strings/internal/cord_internal.h index f1af8e6e..57e7046a 100644 --- a/absl/strings/internal/cord_internal.h +++ b/absl/strings/internal/cord_internal.h @@ -31,12 +31,23 @@ namespace absl { ABSL_NAMESPACE_BEGIN namespace cord_internal { +// Default feature enable states for cord ring buffers +enum CordFeatureDefaults { + kCordEnableRingBufferDefault = false, + kCordShallowSubcordsDefault = false +}; + extern std::atomic cord_ring_buffer_enabled; +extern std::atomic shallow_subcords_enabled; inline void enable_cord_ring_buffer(bool enable) { cord_ring_buffer_enabled.store(enable, std::memory_order_relaxed); } +inline void enable_shallow_subcords(bool enable) { + shallow_subcords_enabled.store(enable, std::memory_order_relaxed); +} + enum Constants { // The inlined size to use with absl::InlinedVector. // -- cgit v1.2.3