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* Export of internal Abseil changesGravatar Abseil Team2020-10-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | -- 017c3924d21132085bc20c9be0ae469bfbf2c56c by Gennadiy Rozental <rogeeff@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 338723934 -- 8b08c23d7b05232e283b1388cee3eb5bebc2d9c4 by Derek Mauro <dmauro@google.com>: Add script to test GCC floor (the minimum version of GCC we support, currently the GCC 5 series) PiperOrigin-RevId: 338708581 -- afa440ac7c843126b4f99b89ebc071dda1d85a4d by Abseil Team <absl-team@google.com>: Fix typo in documentation of StatusOr::value_or() ('of' -> 'if'). PiperOrigin-RevId: 338690089 -- 97d5008865327fc36b942b96de0d0cacfb909df5 by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 338568224 -- da5e09a7fedb3217329465d9206b7cbc6677176b by Abseil Team <absl-team@google.com>: Add `absl_btree_prefer_linear_node_search` Allow keys of `btree_set`, `btree_map`, `btree_multiset`, and `btree_multimap` to opt-in to linear search (instead of binary search). Linear search was used previously for arithmetic types with `key_compare` of `std::greater` or `std::less`. For example, this would be useful for key types that wrap an integer and define their own cheap `operator<()`. ``` class K { public: using absl_btree_prefer_linear_node_search = std::true_type; ... private: friend bool operator<(K a, K b) { return a.k_ < b.k_; } int k_; }; absl::btree_map<K, V> m; // Uses linear search assert((absl::btree_map<K, V>::testonly_uses_linear_node_search())); ``` PiperOrigin-RevId: 338476553 -- c56ead7ce6b0a5ad32e3a42904c686448a69451e by Gennadiy Rozental <rogeeff@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 338419417 GitOrigin-RevId: 017c3924d21132085bc20c9be0ae469bfbf2c56c Change-Id: I1199f3ae917280a3ef20ccc6038abbe34d96ec0b
* Export of internal Abseil changes.Gravatar Abseil Team2018-11-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | -- 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 by Jon Cohen <cohenjon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 220523164 -- 59ef14fe7034a3148f1e9cef1f128b8ca264b444 by Jon Cohen <cohenjon@google.com>: Don't assume how much std::vector's constructors allocate in InlinedVector's test for scoped_allocator_adaptor support. PiperOrigin-RevId: 220464683 -- 6f8351be43a44a8f10bf20612b2cc744a4a911c7 by Jon Cohen <cohenjon@google.com>: Add VS Code and some Bazel output files to absl/.gitignore PiperOrigin-RevId: 220464362 -- 43fac22f8af6b6ed55309a784a9d25d837393d0e by Abseil Team <absl-team@google.com>: absl: fix SpinLock::EncodeWaitCycles If a thread has ever observed or set kSpinLockSleeper, it must never leave 0 in kWaitTimeMask because at this point it is expected to wake subsequent threads. Current calculations in EncodeWaitCycles can result in 0 in kWaitTimeMask and lead to missed wakeups. This is mostly theoretical today, because the futex call needs to finish within 128 cycles (futex can return immediately without waiting, but 128 cycles still look too low for this). But this can well fire in future if we bump granularity and/or threshold for recording contention. Use kSpinLockSleeper instead of 0. PiperOrigin-RevId: 220463123 -- def9b7e3d45c99d68cc52a4429256116d7f421f2 by Abseil Team <absl-team@google.com>: absl: optimize SpinLock::SlowLock Currently we record contention even after the first initial spin. This leads to several performance issues: 1. If we succeed in acquiring the lock after the initial spin, overall wait time can be within tens/hundreds of nanoseconds. Recording such low wait time looks completely unnecessary and excessive. From some point of view this is not even a wait, because we did not sleep. And, for example, Mutex does not record contention in this case. In majority of cases the lock should be acquired exactly during the initial spin, yet we still go through full overhead of submitting contention. 2. Whenever a thread submits contention it also calls FUTEX_WAKE (there is no way to understand if it's necessary or not when wait value is stored in the lock). So if there are just 2 threads and a brief contention, the second thread will still call FUTEX_WAKE which is completely unnecessary overhead. Don't record contention after the initial spin wait. FWIW this also removes 2 CycleClock::Now calls and EncodeWaitCycles from the common hot path. PiperOrigin-RevId: 220379972 -- 75b0c0cb214de904ea622f81ec3f4eabdc8695b0 by Derek Mauro <dmauro@google.com>: Supress MSVC warnings in raw_hash_set's use of TrailingZeros and LeadingZeros. https://github.com/abseil/abseil-cpp/issues/208 PiperOrigin-RevId: 220372204 GitOrigin-RevId: 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 Change-Id: I3a66af4e050810a3274e45d4e055b2aa19ffba1b
* Export of internal Abseil changes.Gravatar Abseil Team2018-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | -- 4e043a11b4c10a24e84046827ee16f47e11e35cc by Abseil Team <absl-team@google.com>: Merge of https://github.com/abseil/abseil-cpp/pull/136 PiperOrigin-RevId: 218197648 -- e61f06e1e601061a443feaa8c5207c52437bd641 by Abseil Team <absl-team@google.com>: Don't include <iostream> into int128, it's wasteful Including iostream emits a global constructor for initializing std::cout and friends, which isn't actually used by this file. PiperOrigin-RevId: 218156386 -- 8a6c82396e4c956be7f285328aec131cb4965f16 by Xiaoyi Zhang <zhangxy@google.com>: Fix MSVC compiler warnings on discarding return values of functions with 'nodiscard' attribute. PiperOrigin-RevId: 217883401 -- abf3e3a0f22bc4070df9dbc9a4ef4d883ed686bf by Tom Manshreck <shreck@google.com>: Update public README to add new libraries PiperOrigin-RevId: 217879399 -- 43b3b420a4e861711abbfbd497b8f2b3de17ec8c by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 217780963 -- 1c8831947ca6a65a63842e6bd5f37a7c102a4e1b by Abseil Team <absl-team@google.com>: Fix typo in a comment (missing comma in usage example). PiperOrigin-RevId: 217776645 GitOrigin-RevId: 4e043a11b4c10a24e84046827ee16f47e11e35cc Change-Id: I8999ae928da7a0030b4ecfd8d13da8522fdd013a
* - fd5f3d7077270ffc5ea74cdb9e18bbae3b9b46aa Fix typo optional -> variant by ↵Gravatar Abseil Team2018-04-23
Abseil Team <absl-team@google.com> - 9136c06dfa8dbfdde0a427ad3509e34763d607a6 Fix string_view_test and str_cat_test build under MSVC de... by Derek Mauro <dmauro@google.com> - a463820f9441888f4368aa87328599e3209f9b07 Removes constexpr optional<T>::operator->(). This was don... by Abseil Team <absl-team@google.com> - 3bf78a7f126daafff329f7815d507422f1ca378d Remove dependencies on external CCTZ project. by Shaindel Schwartz <shaindel@google.com> - a4ae574a11b1ddf6e88459af3d638cf79aea7ecd Internal change by Jon Cohen <cohenjon@google.com> GitOrigin-RevId: fd5f3d7077270ffc5ea74cdb9e18bbae3b9b46aa Change-Id: I6ab8ab99863716fe9b2745a12ef285f7a6da6d1e