Summary: Since C++17 `vector::emplace_back()` returns a reference to the new element, support that in `small_vector` too.

Reviewed By: terrelln, luciang

Differential Revision: D15007059

fbshipit-source-id: 3873fd0097e3d50f7967f47fbecfa6ab20cc72c5

Summary: The virtual functions marked `protected` in `ThreadPoolExecutor` should be marked `protected` in `EDFThreadPoolExecutor`.

Reviewed By: yfeldblum

Differential Revision: D15008767

fbshipit-source-id: 6bad51068a8b64f623643e0d0deb684ed6e2be22

Summary: as in title

Differential Revision: D15005737

fbshipit-source-id: 6ac0ff3d7498e505f0437dd5be76735d66eb953e

Summary:
Remove getSelfCert and getPeerCert APIs from
AsyncTransport.

This removes an explicit dependency on the X509 type
from openssl

Reviewed By: yfeldblum

Differential Revision: D14970297

fbshipit-source-id: b727789d3a37a57d4728709ab66a575d40176172

Summary:
- Older versions of GCC required defining private member function
  `emplace_back_aux` out-of-line. That is, declare the member in-class and
  then provide the definition fully out of line.
- These older versions of GCC are not supported anymore, so just define
  it inline as you would any other member function.
Pull Request resolved: https://github.com/facebook/folly/pull/1077

Reviewed By: meyering

Differential Revision: D14591465

Pulled By: yfeldblum

fbshipit-source-id: 0ebfe55cec4e230c36c98ad595ec8dcfc98a211e

Summary: StorageTriviallyDestructible needed a constexpr ctor.

Reviewed By: yfeldblum, ot, luciang

Differential Revision: D14944492

fbshipit-source-id: cd9d39d7cb0719e7830887f548eabcc0defa1aee

Summary:
Update the folly spec to use `fb_github_project_workdir()` rather than just
`github_project_workdir()`.

This shouldn't have any impact for external github-based builds, but for our
internal continuous integration builds this should make builds for downstream
projects pick up the correct local version of folly that matches the commit of
the downstream project that is being built.

This behavior was unintentionally changed to not use the `fb_*` version in
D10520960.

Differential Revision: D14969380

fbshipit-source-id: 000b10525821fb5e0312d1869198a68befa0bd91

Summary: The current order of retire and reclaim_nodes in clear() introduces a subtle bug which allows the hazptr library to destroy the Chunks array from reclaim_nodes, freeing the memory at chunks_, then continue reclaiming nodes which involves further access to chunks_.`

Reviewed By: magedm

Differential Revision: D14968860

fbshipit-source-id: 1bc8e543ae54c3d0e26affb1fd352c58cc5ce897

Summary:
Recently, IOBufQueue started "packing" smaller IOBufs (i.e. <= 4KB) when serializing.
This was helpful to avoid unnecessarily IOBuf chaining.

That said, we did not update our serializedSizeZC() functions to emit an accurate
memory estimate in the case that we did need to pack the IOBuf data. This changes
to pass though the IOBuf size, if under the threshold.

Also, add a few basic comments in the Protocol implementations about what
serializedSize() means, because it's not entirely obvious to a new user that
the results aren't intended to be accurate. And document what "ZC" is intended for.

Reviewed By: yfeldblum

Differential Revision: D14919060

fbshipit-source-id: 18e9bd0c6b9e40ccd1006cffba36363c6f95ea41

Summary: [Folly] Fix `StaticSingletonManagerSansRaii` cache.

Reviewed By: aary

Differential Revision: D14928194

fbshipit-source-id: 6800c96ff40ec35e18a06b9c6a9f150a50695e37

Summary:
The uint32_t futex specialization for atomic_notify_all didn't remove
the Integer template parameter, causing calls with atomic<uint32_t> to not
specialize properly.

Reviewed By: yfeldblum

Differential Revision: D14957311

fbshipit-source-id: 063e0f6d18360d7e2ce8dd5bbf5c46c52a6fc833

Summary: change the macros to work on MSVC

Reviewed By: yfeldblum

Differential Revision: D14942488

fbshipit-source-id: 12d6814230bd9b92b54603cd711d03cd8b5f8086

Summary: reduces folly::Executor dependencies

Reviewed By: yfeldblum

Differential Revision: D14939208

fbshipit-source-id: bc354e838608eb8b25373ed5179e72acef813edd

Summary:
fixed some compile errors when building SMC with pushmi as a dependency

some _v traits do not exist

a specialization of ManualLifetime<void> was required

Reviewed By: yfeldblum

Differential Revision: D14939161

fbshipit-source-id: 76a1f05d7ce889d00fdf4a264e5e719fdb12d4ac

Summary: `reference_type` is unused

Reviewed By: yfeldblum

Differential Revision: D14944273

fbshipit-source-id: f4c968735fcb7173e5ee256381455c81492e02df

Summary:
In zstd-1.4.0 we've renamed one function used by folly. Add compatibility
macros to work with both function names.

Reviewed By: Cyan4973

Differential Revision: D14941863

fbshipit-source-id: deaf63b28ac8e4c3e6f6c0c192ed2d0e452ddca7

Summary: Under heavy contention, lock will recurse several times. This can lead to fiber stack overflow.

Differential Revision: D14936384

fbshipit-source-id: e934569a9f742859655ba3ea888ebabd4d959651

Summary: Support for capturing metadata while doing folly json parsing

Reviewed By: yfeldblum

Differential Revision: D13626597

fbshipit-source-id: 8e7a26e23d966240d35c4f6d6104d9334a675a12

Summary: Let `ThreadLocalPtr` member `reset()` synchronize with member type `Accessor` lifetime, preventing data races that could happen if `reset()` is called while another thread is within the `Accessor` critical section.

Reviewed By: yfeldblum

Differential Revision: D14878801

fbshipit-source-id: 4090c5749d08bee3fd9b50b23df6e716bc78c9c7

Summary: add support for flow to `on()` - requested by Songqiao

Reviewed By: ericniebler

Differential Revision: D14814588

fbshipit-source-id: 3989d0aa554a32482dcc15c1ba706d5604c95eb8

Summary: Fixes bug in transform reported by rhodo

Reviewed By: ericniebler

Differential Revision: D14814574

fbshipit-source-id: fdc3866ad56ced11e858869a24ca95b08295477d

Summary: The Impl param is last so its a pain to switch between BucketTable and SIMDTable in the common case where only KeyType and ValueType are specified. This diff enables ConcurrentHashMapSIMD<key, value>.

Reviewed By: djwatson

Differential Revision: D14916671

fbshipit-source-id: 980518179b87316ae344cbf96be4e6bcc032424e

Reviewed By: yfeldblum

Differential Revision: D14813810

fbshipit-source-id: b6294f0b2e52bd062ad7b1d5977fbe68dec82d1b

Summary: [Folly] Use `tag_t` instead of `TypeTuple` for singletons.

Reviewed By: andriigrynenko

Differential Revision: D14927424

fbshipit-source-id: fdd33a30d5abde67c50df009a0cacc89462278b7

Summary:
`moveObjectsRightAndCreate()` did pointer arithmetic outside of the object,
because it had a one before the beginning pointer. Instead, decrement the
pointers before use.

Reviewed By: ot

Differential Revision: D14887926

fbshipit-source-id: 198151d1eaef17e86cda800367480e0a8f7b2f49

Summary:
Instead of default constructing in `moveObjectsRight`, insert the objects
directly into the hole. This has the added benefit of avoid a default
construction. The creation function has to be careful to return references
(rvalue, or lvalue) to avoid extra constructions without guaranteed NRVO.

I've constructed the elements in reverse order since it is strange to copy
backwards, then construct forwards, but don't have strong opinions, since
either way is correct.

Reviewed By: ot

Differential Revision: D14883034

fbshipit-source-id: bc0d19bf94705718500b80e2d6c202784134e7a5

Summary:
In order to set the verified chain of a X509 store we need to be able to use X509_STORE_CTX_set0_verified_chain both for openssl 1.1.0 and previous versions.

Proxygen needs this to complete the clang/platform007 upgrade.

Reviewed By: Orvid

Differential Revision: D14894384

fbshipit-source-id: 378eb834b077469b666ad303f28f54af5caff990

Summary:
This ensures that we can use any tuple type in maps/other places where
hashes are useful.  Since there's only one value for an empty tuple, just
return 0.

Reviewed By: ot

Differential Revision: D14898947

fbshipit-source-id: 8fefab46df32a6cc56e43b02346bbefe4d4ec567

Summary:
Split out enable IPv6 on docker into its own script.
Do not do this on MacOS hosts; where we would not be running in a docker container.
use apt add-on rather; which automatically disabled for non-apt supporting OSes (MacOSX)
Pull Request resolved: https://github.com/facebook/folly/pull/1108

Reviewed By: vitaut

Differential Revision: D14899358

Pulled By: calebmarchent

fbshipit-source-id: 342e7a37e27317018d98d77e8603c896f34b3bc6

Summary:
Hello Facebook,

This small PR to fix the redundant std::move usage detected by gcc (GCC) 9.0.1 20190225 (experimental)

```
/folly/BUILD/folly-2019.04.01.00/folly/executors/task_queue/PriorityLifoSemMPMCQueue.h:92:30: error: redundant move in return statement [-Werror=redundant-move]
   92 |         return std::move(item);
      |                              ^
```

Stac
Pull Request resolved: https://github.com/facebook/folly/pull/1107

Reviewed By: Orvid

Differential Revision: D14874144

Pulled By: yfeldblum

fbshipit-source-id: c65a422c500606103192b3d9377a52b4abf5a653

Summary: This patch introduces an earliest-deadline-first (EDF) executor: `folly/executors/EDFThreadPoolExecutor`.

Reviewed By: interwq

Differential Revision: D13983430

fbshipit-source-id: 0df9bc4a1cdbe9059489d1e1abad88b9e6d17ad9

Summary:
Needs to be enabled by option PYTHON_VENV in the config.

shell_builder.py sets up the venv and uses it once; calling activate

For docker we set ENV; resulting in the virtual environment being present
when the resulting container is run as well as at build time. This is also cleaner
and easier to follow than re-asserting on each RUN step.

For Lego builder we need to source activate on each command as environment
will not persist between commands.

While man on the posts say it makes no sense to use virtualenv within docker
container, this method simplifies the process considerably as we can rely on the
name pip being valid and we don't need to either ensure we are root or pass the
--user flag to pip and setuptools.

Pull Request resolved: https://github.com/facebookincubator/LogDevice/pull/76

Reviewed By: wez

Differential Revision: D14875633

Pulled By: calebmarchent

fbshipit-source-id: aabbcdd509d2a59fa36f8004032a052f014ce1ba

Summary: add take_until algorithm

Reviewed By: ericniebler

Differential Revision: D13697233

fbshipit-source-id: b2e060bc88cb652dc196e4915961d811a97b414d

Reviewed By: wez

Differential Revision: D14890912

fbshipit-source-id: 7ea8f28348d27131cf896bd8b5669153211af591

Summary:
- Removed unused EventBase
- Simplified
```
auto f = p.getSemiFuture().toUnsafeFuture();
auto sf = std::move(f).semi().defer(...);
```

to

```
auto sf = p.getSemiFuture().defer(...);
```

- Corrected `semiFutureWithinNoValueReferenceWhenTimeOut`. it wasn't testing anything because the future is not waited for and if it's waited for, `callbackInput` has exception, not value.

Reviewed By: LeeHowes

Differential Revision: D14877386

fbshipit-source-id: 03df59af0339b20aa9e85506640e89cc383f3b9a

Summary:
The file descriptor API here needs to go away, so switch this API to NetworkSocket

It is expected that this commit will cause a number of Open Source projects to temporarily show up as broken. This is due to the fact that not all projects get synced to Github at the exact same time, so the builds may temporarily be fetching an older version of it's dependencies than it needs to :) It should fix itself quickly.

Reviewed By: yfeldblum

Differential Revision: D14673328

fbshipit-source-id: c5842fa5dc383d50043e0d8228e35d03b10a1c6b

Summary:
[Folly] Address gcc-5.3 ice in `pretty_name`.

Fixes #1105.

Pull Request resolved: https://github.com/facebook/folly/pull/1106

Reviewed By: Orvid

Differential Revision: D14864700

fbshipit-source-id: bd336135c8c39daca63e2a23fa5e9ea8589dd067

Summary: [Folly] Wait on the specified child in the rcu fork test, v.s. waiting on any child. Makes the test more exact.

Differential Revision: D14869269

fbshipit-source-id: 2bb0110e5097f1dfe21602a09893a33e92421555

Summary:
As an alternative to backend to BucketTable, introduce SIMDTable, which mimics the use of SSE intrinsics to filter tags as found in F14 code.

On synthetic benchmarks, SIMDTable outperforms BucketTable by between 1.1x and 2.6x operations per second when the map does not fit in cache. However, when the map fits in cache SIMDTable executes around 10% fewer operations per second compared with BucketTable.

BucketTable, the existing backend, remains the default.

Reviewed By: djwatson

Differential Revision: D14458269

fbshipit-source-id: 5b6b01db5eb2430bdfc6f3500458f25971a6ad3d

Summary: [Folly] Handle Clang on Windows in `pretty_name`.

Reviewed By: Orvid

Differential Revision: D14844690

fbshipit-source-id: 1f995604d5be0cd571caa344e5b18f877188390d