Summary: It's dead.

Reviewed By: yfeldblum

Differential Revision: D14192000

fbshipit-source-id: 3cecbc8e9f656080a023d676883de9943e7d0004

Shift calls of the file descriptor overload of AsyncSocket::AsyncSocket() to the NetworkSocket overload

Summary: The file descriptor overload will be going away.

Reviewed By: yfeldblum

Differential Revision: D13998628

fbshipit-source-id: 7a1d3bae03d4742d874e1e7d733f7733b5a1c110

Summary: Deprecate sleepUnsafe to avoid use growing and to clearly communicate the change.

Reviewed By: yfeldblum

Differential Revision: D14255404

fbshipit-source-id: cb2116910a15b9835fef9bf4273242457a5e96bd

Summary:
InlineFunctionRef is a semantically the same as folly::FunctionRef but has the
additional benefit of being able to store the function it was instantiated
with inline in a buffer of the given capacity.  If there is not enough in-situ
capacity for the callable, this has the same semantics as FunctionRef.

This helps give a perf boost in the case where the data gets separated from
the point of invocation.  If, for example, at the point of invocation, the
InlineFunctionRef object is not cached, a remote memory/cache read might be
required to invoke the original callable.  Customizable inline storage helps
tune storage so we can store a type-erased callable with better performance
and locality.  A real-life example of this might be a folly::FunctionRef with
a function pointer.  The folly::FunctionRef would point to the function
pointer object in a remote location.  This causes a double-indirection at the
point of invocation, and if that memory is dirty, or not cached, it would
cause additional cache misses.  On the other hand with InlineFunctionRef,
inline storage would store the value of the function pointer, avoiding the
need to do a remote lookup to fetch the value of the function pointer.

To prevent misuse, InlineFunctionRef disallows construction from an lvalue
callable.  This is to prevent usage where a user relies on the callable's
state after invocation through InlineFunctionRef.  This has the potential to
copy the callable into inline storage when the callable is small, so we might
not use the same function when invoking, but rather a copy of it.

Also note that InlineFunctionRef will always invoke the const qualified
version of the call operator for any callable that is passed.  Regardless of
whether it has a non-const version.  This is done to enforce the logical
constraint of function state being immutable.

This class is always trivially-copyable (and therefore
trivially-destructible), making it suitable for use in a union without
requiring manual destruction.

Reviewed By: yfeldblum, ot

Differential Revision: D14029799

fbshipit-source-id: 2cff3ce27d564f3d524095189f847c14911f9402

Summary:
Don't assume a jemalloc target exists (even if it would be a no-op, as
in on macOS). Instead compute the correct set of external_deps in
jemalloc.bzl.

This fixes the folly build on mode/mac after D14179337.

Reviewed By: andrewjcg

Differential Revision: D14235815

fbshipit-source-id: d1bfbb91897de9557524bbb4b5736ca7b03cbf9b

Summary:
- If a type is not marked explicitly with `IsRelocatable`
  as `std::true_type`, we infer its relocability only based on the
  property of whether the type is trivially copyable.
- Extend the default relocability to also be true for trivially move
  constructible types.
Pull Request resolved: https://github.com/facebook/folly/pull/1035

Reviewed By: Orvid

Differential Revision: D14240127

Pulled By: yfeldblum

fbshipit-source-id: 1e15d312d1a8340417bba2beb1db30ce4c543b26

Summary: It is dead

Reviewed By: yfeldblum

Differential Revision: D14235873

fbshipit-source-id: bafc323898f2a17aedf6644f9c2dd7319b8e6420

Summary: Merge two mutexes together and get rid of atomics.

Reviewed By: yfeldblum

Differential Revision: D14236244

fbshipit-source-id: 0b97d519e72322377e225a0cc8975e3a2a86ec31

Summary: I missed one of the functions that needs a NetworkSocket overload in past iterations.

Reviewed By: yfeldblum

Differential Revision: D14237211

fbshipit-source-id: 6d0bd151ff636206a44940c88a2d48c339aa67de

Summary:
Make this metafunction available for use outside of the
folly::coro::blockingWait() implementation.

I plan to reuse this metafunction for other operators such as `when_all()`.

Reviewed By: yfeldblum

Differential Revision: D13778687

fbshipit-source-id: f766f93da21bf19e89262cd60048b0b7b1b76940

Summary:
- `folly/experimental/Bits.h` has a section where we disable two
  uninitialized-flavors of warnings that were needed for GCC 4.8
- Since we do not support GCC 4.8 anymore and GCC 5.1 does not have
  issues with this, do not disable the warnings anymore.
Pull Request resolved: https://github.com/facebook/folly/pull/1033

Reviewed By: Orvid

Differential Revision: D14223285

Pulled By: yfeldblum

fbshipit-source-id: 0088341b13e26dff2dc90a768319cccc45e942da

Summary: [Folly] `DefaultKeepAliveExecutor::reset` in case of restartable executors.

Reviewed By: andriigrynenko

Differential Revision: D14236173

fbshipit-source-id: 14f71af6bd54777770fdfe6036a4137af4e884bc

Summary: [Folly] Cut deducible template arg in `DefaultKeepAliveExecutor` init - let it be deduced instead.

Reviewed By: andriigrynenko

Differential Revision: D14236171

fbshipit-source-id: 2de043efe541c13c59764715516b08d77efcb99b

Summary:
If multiple leaves are updated at the same time (or a new observer is created concurrently that depends on the updated leaf) it's possible for refresh to be called concurrently with force=false which will not update the leaf value, but also ignore the refresh with force=true.
This is fixed by making force to be the property of the leaf observer itself, which is set when the version is bumped.

Reviewed By: yfeldblum

Differential Revision: D14222400

fbshipit-source-id: 657c2c273002f576dbe48a232eaef2d530cea07d

Summary:
Angled brackets inside angled brackets is not displayed.
This makes the document misleading.
Pull Request resolved: https://github.com/facebook/folly/pull/1032

Reviewed By: shixiao

Differential Revision: D14207772

Pulled By: yfeldblum

fbshipit-source-id: 4f2e58145a5473a7b887ef1da4efbeb16d5330c6

Summary:
futures::sleep returning a Future leads to continuations easily being run on
the Timekeeper's callback. The goal is to change the return type so that
futures::sleep returns a folly::SemiFuture.

Reviewed By: yfeldblum

Differential Revision: D14069549

fbshipit-source-id: b98e2c76ccbf0a80aed28f90a1f3c63f15eb2e5c

Summary:
- Existing code disables `-Warray-bounds` warning for GCC due to a bug in
  GCC 4.9.
- As seen in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59124, the bug
  has been resolved for GCC 5.1.
- Since the bug has been resolved, we no longer need to disable the
  warning.

yfeldblum I suspect that we have to hold off on this PR until the internal use cases relying on GCC 4.9 upgrade, but I figured it is better to have some of these cleanup opportunities ready for when the time arises.
Pull Request resolved: https://github.com/facebook/folly/pull/999

Reviewed By: ot, Orvid

Differential Revision: D13729723

Pulled By: yfeldblum

fbshipit-source-id: da33704c2e2022c2dad0681e4d6152105a1cf54d

Summary:
[Folly] Address MSVC C4686 in `folly/lang/Pretty.h`.

Resolves:

```
folly\lang\pretty.h(119): warning C4686: 'folly::detail::pretty_name_zarray<T>::zarray_': possible change in behavior, change in UDT return calling convention
```

Reviewed By: Orvid

Differential Revision: D14214290

fbshipit-source-id: c5e0ebd7c100413737bdcba157ec8b5ce42895de

Summary:
Infer AL has reported valid warnings on some folly and thrift code:

```
fbcode/folly/io/async/AsyncUDPServerSocket.h:228:19:
WARNING Extra Copy: Potentially unnecessary to copy var `client` at line 228, column 19. Use 'const auto&' or 'auto&' if possible.
fbcode/folly/io/async/AsyncUDPServerSocket.h:230:19:
WARNING Extra Copy: Potentially unnecessary to copy var `socket` at line 230, column 19. Use 'const auto&' or 'auto&' if possible.
fbcode/thrift/lib/cpp/TProcessorEventHandler.h:148:15:
WARNING Extra Copy: Potentially unnecessary to copy var `ew` at line 148, column 15. Use 'const auto&' or 'auto&' if possible.
fbcode/thrift/lib/cpp2/server/ThriftServer.h:705:20:
WARNING Extra Copy: Potentially unnecessary to copy var `sockets` at line 705, column 20. Use 'const auto&' or 'auto&' if possible.
```

As these are transitively included in many services, they are fairly prevalent/annoying warnings. Let's fix them.

Reviewed By: yfeldblum

Differential Revision: D14168260

fbshipit-source-id: 12e537fe5aa73e653c15c4fef01ac618e51cd4d0

Summary:
- `F14Table.h`'s fallback when SIMD isn't used has template specializations
  to track which `std::hash` implementations are considered worth caching by
  `std::unordered_map`. This included `std::string` but was missing
  support for `std::string_view`. This commit adds support for marking
 `std::string_view` as not fast.
Pull Request resolved: https://github.com/facebook/folly/pull/1031

Reviewed By: nbronson

Differential Revision: D14197661

Pulled By: yfeldblum

fbshipit-source-id: bd634b5755e2794891200c7f71e9d6874a60cc38

Summary:
- `FOLLY_USE_CPP14_CONSTEXPR` macro is not needed as Folly requires a
  recent enough version of MSVC where its constexpr support is "good
  enough". For Clang and GCC, the min compiler versions supported would
  both evaluate the prior implementation of this macro to true in both
  cases. This is potentially slightly behavior changing since
  `FOLLY_USE_CPP14_CONSTEXPR` would be `inline` for ICC and I am not
  sure if its constexpr support is "good enough" for a min version of
  ICC we claim support for.
- Replace `FOLLY_CPP14_CONSTEXPR` with `constexpr` in all call sites and
  remove the `FOLLY_CPP14_CONSTEXPR` macro.
- Simplify how we define `FOLLY_STORAGE_CONSTEXPR` and
  `FOLLY_STORAGE_CPP14_CONSTEXPR` after cutting
  `FOLLY_USE_CPP14_CONSTEXPR`.
Pull Request resolved: https://github.com/facebook/folly/pull/1029

Reviewed By: Orvid

Differential Revision: D14199538

Pulled By: yfeldblum

fbshipit-source-id: 99daecf7d7ad0c4bf6735e74247112a78923602a

Summary: [Folly] Use `pretty_name` in `F14TableStats`, which may not be exact in edge cases (e.g. function-local policy types) but which works without RTTI.

Reviewed By: nbronson

Differential Revision: D14129242

fbshipit-source-id: 6f7a8e0b3af4d6b16673770228e98cd989ab0c3f

Summary: Update to use thenError rather than onError.

Reviewed By: yfeldblum

Differential Revision: D14209634

fbshipit-source-id: 5cbb66146b148654641a7a0a58717a31608a4ac7

Summary:
[Folly] Omit excess landing pads with `StaticSingletonManager` when the type of the global is nothrow-default-constructible.

This changes behavior for nothrow-default-constructible types to terminate immediately if the process is out of memory while performing the bookkeeping around attempting to instantiate a global.

Reviewed By: andriigrynenko

Differential Revision: D14203826

fbshipit-source-id: 8c9becde3b245d6b027c97bd8541c48745727dff

Summary:
- It is verbose at the call sites to cast an enum or enum class to its
  underlying type.
- Introduce `to_underlying_type`, which, given an enum or enum class,
  returns the value from static casting to the underlying type.
Pull Request resolved: https://github.com/facebook/folly/pull/1028

Reviewed By: stevegury

Differential Revision: D14199619

Pulled By: yfeldblum

fbshipit-source-id: fde85b9be50945a390b18ba1448a0137f3d7b63e

Summary: Remove all uses and remove the overload.

Reviewed By: yfeldblum

Differential Revision: D14194039

fbshipit-source-id: c3b271747200b9219b734e5a0f19c6d5d4d135a2

Summary: Fix namespace in folly::copy comments

Reviewed By: yfeldblum

Differential Revision: D14202488

fbshipit-source-id: 14ebc5a58bfd3b62e4d6ecd03e1ceffa796f4b1f

Summary: The codemod tooling has demonstrated issues distinguishing between integer and bool overloads, so add a safety net just in case.

Reviewed By: yfeldblum

Differential Revision: D13995489

fbshipit-source-id: 2a853f8c961953d4cdd24256420ecc29cb13c677

Summary: The file descriptor overload will be going away.

Reviewed By: yfeldblum

Differential Revision: D14070240

fbshipit-source-id: 20a0248fd9840629e31a3274032b889b6bb5f8de

Summary: They are dead.

Reviewed By: yfeldblum

Differential Revision: D14191874

fbshipit-source-id: 80e6b9c51aa7d29ccc01148ccb1fd1014688c764

Summary: [Folly] Shrink `StaticSingletonManager` inline slow path by passing only one argument to the outline slow path, rather than passing three arguments. In optimized builds, the argument is an immediate loaded into a register.

Reviewed By: andriigrynenko

Differential Revision: D14121341

fbshipit-source-id: f715225d0dc94df9bf2bef440ffeb08bb7a88fba

Summary:
[Folly] Cut outdated comment in `FOR_EACH_RANGE` implementation details.

It refers to a shortcoming in a specific version of boost which is no longer supported in folly.

(Note: this ignores all push blocking failures!)

Reviewed By: Orvid

Differential Revision: D14197473

fbshipit-source-id: 3379af1cc69ab96fcb77be0a56ea7a5762ff7db5

Summary:
When adjusting nextBucketStart by rounding down, we should also check if
that causes it to not overlap with the user-specified [start, end) time
interval. If it does not overlap, then return an empty return type since
this bucket does not contribute anything to the specified time-range.

Reviewed By: simpkins

Differential Revision: D14121401

fbshipit-source-id: bbfb1d6a71c9fb99244cdff887a7a9ee18741f25

Summary: [Folly] Revert `StaticMeta` deleted dtor, which does not work well with standard constructibility tests like `std::is_constructible<StaticMeta<...>, ...>`.

Reviewed By: andriigrynenko

Differential Revision: D14181902

fbshipit-source-id: de75fe2fc864c9a32a74b8058532ef49412ac838

Summary: [Folly] `FOLLY_TYPE_INFO_OF` for cases where `folly::type_info_of` is insufficient.

Reviewed By: andriigrynenko

Differential Revision: D14181350

fbshipit-source-id: 65d63424a5feaa6597eaddb670f760f0223717ae

Summary:
Add XCHECK_EQ(), XCHECK_NE(), XCHECK_LT(), XCHECK_LE(), XCHECK_GT(), and
XCHECK_GE(), plus corresponding XDCHECK_*() versions that only fail in debug
buildk.

These are similar to XCHECK()/XDCHECK(), but on failure they also log the
values of the two expressions being compared.

Reviewed By: therealgymmy

Differential Revision: D14016494

fbshipit-source-id: dba02d748f78d306227ec734d9e52ef0bc73919b

Summary:
Fix an `invalid-shift-base` UndefinedBehaviorSanitizer failure.
Previously all of the DistributedMutex-inl.h tests would fail with the
following message on my system:

  runtime error: left shift of 94500093116194837 by 8 places cannot be
  represented in type 'long'

It might be slightly nicer in the long run to change this code to use
`std::chrono::duration<std::uint64_t, std::nano>` throughout rather than
`std::chrono::nanoseconds`.  Currently the `time()` function casts the
`uint64_t` value returned by `folly::hardware_timestamp()` into a signed
value.

Reviewed By: yfeldblum, aary

Differential Revision: D14180336

fbshipit-source-id: b199ae22d951162dc6f31d7f1c41a7d67cbcc935

Summary: [Folly] Better constrain `EvictingCacheMap` iterator conversions.

Reviewed By: shixiao

Differential Revision: D14162009

fbshipit-source-id: 8a3011450620fcf1ee6a137834ebbd1e5953e0ed

Summary:
We observed some RSS regression for certain use cases - setting decay time to 0 should fix this as freed regions will be released back to the kernel immediately instead of delayed.

The risk is that we lose regions before we can reallocate them and thus over time end up with holes in the huge page region.
If we see this becoming an issue for some use cases, we can add a parameter to control the decay time.

Releasing immediately should be OK for huge pages in most cases. For cases with frequent allocation and deallocation of large areas there can be a perf impact however.

Reviewed By: interwq

Differential Revision: D13853171

fbshipit-source-id: 83fb95ed9c9bcb6ebdd1f80d78347e5eec61c084

Summary:
- When Folly supported autotools builds, a different include for
  `dwarf.h` was required in `folly/experimental/symbolizer/Dwarf.cpp`.
- Since Folly does not support autotools  builds as of `1d58fd57`, cut
  this include and just assume `<dwarf.h>` works.
Pull Request resolved: https://github.com/facebook/folly/pull/1023

Reviewed By: simpkins

Differential Revision: D14119901

Pulled By: yfeldblum

fbshipit-source-id: f676f72ec91e25390cb3bbbe544de7cbc68e1d73