Summary:
F14 maps and sets were missing the operator= overload that takes
an initializer list, resulting in map = {} having reset behavior rather
than clear behavior.  Without the overload an empty map is constructed and
then moved onto the lhs, freeing all memory.  With the overload we call
clear(), which retains the existing allocation when it is not too large.
This diff also cleans up the default constructor definitions, adding
noexcept for F14FastMap and F14FastSet and making the others more concise.

Reviewed By: shixiao

Differential Revision: D9661526

fbshipit-source-id: 101d66623bc4d50e7935fa9a73405a825648e6a5

Summary: [Folly] Apply `clang-format` to `folly/futures/`.

Reviewed By: LeeHowes

Differential Revision: D9672492

fbshipit-source-id: c41632c4da6c450096eb249f0708af3db5057a14

Summary: [Folly] Apply `clang-format` to `folly/container/`.

Reviewed By: shixiao

Differential Revision: D9672403

fbshipit-source-id: da8e2a10eafcc8a278c002223cfeec055936d0bc

Summary: [Folly] Apply `clang-format` to `folly/gen/`.

Reviewed By: Orvid

Differential Revision: D9671968

fbshipit-source-id: 1164cf0d236914b5fd7ed35d5d41c785935e876b

Summary: D9624966 deleted FormatArg.cpp but makefile not updated

Reviewed By: knekritz

Differential Revision: D9663460

fbshipit-source-id: 02dc40d4b23de697834aca0247335ee79bebc647

Summary: Add via helpers for KeepAlive argument

Reviewed By: yfeldblum

Differential Revision: D9617303

fbshipit-source-id: 4ace3ea5f48fd8fbed70bcdf7654a1435f5e1d72

Summary:
The format specifier for printf should be %zu to take into account
32bit machines.

Reviewed By: Orvid

Differential Revision: D9665574

fbshipit-source-id: e7019c1deba80addef36ea8f6ebff48b45eceefa

Summary: [Folly] DRY some common code in `folly/gen/test/ParallelBenchmark.cpp`.

Reviewed By: Orvid

Differential Revision: D9664846

fbshipit-source-id: adf198a60ab637e47986ddea9c5c4e7392cf8b27

Summary:
This code fails to compile when FOLLY_HAS_COROUTINES is false. This is
because ExpensiveCopy is defined inside the if scope, and if that macro is
false, then ExpensiveCopy never gets defined. Yet it gets used in the nestedCalls function.

This diff fixes build for that case.

Reviewed By: lewissbaker

Differential Revision: D9663539

fbshipit-source-id: 1c3dd70decab7db955c038cd5c476920bfa6ba53

Summary: [Folly] Refactor `for_each` and `fetch` to fix their unit-tests under MSVC. New code is smaller.

Reviewed By: Orvid

Differential Revision: D9569412

fbshipit-source-id: 87807ddf41f1dbd16244a82c5be30eae08dbdf4c

Summary: [Folly] Assorted fixes to for_each and fetch comments

Reviewed By: aary

Differential Revision: D9632155

fbshipit-source-id: 64932770d3476cdd06c5fa9eb9bd845600f18fff

Reviewed By: lewissbaker

Differential Revision: D9388165

fbshipit-source-id: fa94f008d088c5560d5207c726fabb0e764193fb

Summary: Always using 10000 is no good for concurrent tests.

Reviewed By: Orvid

Differential Revision: D9656798

fbshipit-source-id: 4fb7e48239e42c3b2acd2cc976cb74535c573ef6

Summary: [Folly] Do only single var decl per statement in `folly/test/DynamicConverterTest.cpp`.

Reviewed By: igorsugak

Differential Revision: D9653672

fbshipit-source-id: 08bb529cc90761c69dabd2e00f58f1767f07146a

Summary:
[Folly] Cut the extra braces in `folly/test/ExceptionTest.cpp`.

And reformat.

Reviewed By: igorsugak

Differential Revision: D9653533

fbshipit-source-id: dfeec84d322b32921a375721669ef5ac7a77099f

Summary: Forgot to include the paper number

Reviewed By: yfeldblum

Differential Revision: D9650597

fbshipit-source-id: 05c0720a18ee39a8085739a72fea269589e3c0fa

Summary:
There are efforts as part of the OlympicQos initiative to ensure QOS configuration for all network transfers. As part of these efforts, one of the requirements is the ensure TOS marking for server-->client traffic. Since the server does not have a way of knowing the priority of the response, the server needs to reflect the TOS settings from the client. The idea is the cache the client's SYN, derive the TOS from the same and set hte same TOS for the responses. Made changes to

1) setsockopt(TCP_SAVE_SYN) in AsyncServerSocket() for all listen sockets
2) Upon an accepted connection, getsockopt(TCP_SAVED_SYN) to get the TOS from IPv6 header and setsockopt to set TOS on the connected socket. Do this conditionallly (based on tosReflect_ setting and only for family IPv6)
3) Added API setTosReflect() to enable the feature and included flag on thrift server to control the same

Reviewed By: yfeldblum

Differential Revision: D9566136

fbshipit-source-id: ad61fed4e205893e2b7c5654e1b4f21ed5472c06

Summary: [Folly] `FOLLY_DECLARE_REUSED`.

Reviewed By: marksantaniello

Differential Revision: D9626462

fbshipit-source-id: 23be21e2c6a314b3f65bbfca660958e596915b53

Summary:
This diff allows `folly::dynamic` to lookup and mutate using any type that is
convertible to `StringPiece` (i.e., `const char*`, `std::string`, `fbstring`)
without having to construct a `dynamic` object (which requires copying the
string).

Previously (D8299863), we SFINAE'd and took `StringPiece` by reference. This
caused linker errors for non-member constexpr string constants like the
following which are odr-used.
  struct S {
    static constexpr auto kXXX = "xxx";
  };
  d.at(kXXX); // linker error
Hence in this diff, we template on types that are convertible to dynamic but
NOT to StringPiece, and add a separate overload which takes StringPiece by
value.

Reviewed By: yfeldblum

Differential Revision: D9540388

fbshipit-source-id: 529de31585200947b8b92fcf3126442a8ed51a73

Summary: [Folly] Apply `clang-format` to `folly/compression/`.

Reviewed By: igorsugak

Differential Revision: D9625742

fbshipit-source-id: 5098aa62a3f5d9cc12da0932ab4f33d5a11111dc

Summary: [Folly] Apply `clang-format` to `folly/system/`.

Reviewed By: igorsugak

Differential Revision: D9625730

fbshipit-source-id: 88f93231f77497d933233d4267c6983558baeb25

Summary: [Folly] Apply `clang-format` to `folly/fibers/`.

Reviewed By: igorsugak

Differential Revision: D9625725

fbshipit-source-id: e00f6406db994a1a3f17c1d23b415bea13495e99

Summary: [Folly] Apply `clang-format` to `folly/lang/`.

Reviewed By: igorsugak

Differential Revision: D9625707

fbshipit-source-id: 345dcfbeb67981e928093b03f75125089c4210c1

Summary: [Folly] Apply `clang-format` to `folly/portability/`.

Reviewed By: igorsugak

Differential Revision: D9625664

fbshipit-source-id: fa63f3e3a719c22ea88cd14172d34e360353145f

Summary: [Folly] Do conditional compilation for `MPMCPipeline` using C++ via selecting a base class v.s. using the preprocessor.

Reviewed By: Orvid

Differential Revision: D9625568

fbshipit-source-id: 2e0d7195bb7fa4f44cf8b99ed3d7564b18393b73

Summary: Remove stop() comment since it's not accurate

Reviewed By: yfeldblum

Differential Revision: D9600621

fbshipit-source-id: 599551efc775a622d5a5b4a45ead1f3dcbf10abb

Summary:
It was missing things.

Closes https://github.com/facebook/folly/issues/925

Reviewed By: yfeldblum

Differential Revision: D9631683

fbshipit-source-id: 3ea572ecf5b4d640b6cd2f376cd4c6916e43ed1d

Summary:
[Folly] Make `ThreadPoolExecutorTest.DynamicThreadsTest` not timing-sensitive.

The timing-sensitive version of the test sometimes fails under load, and is observed in some internal `folly-oss` jobs.

Rewrite the test to avoid using long sleeps to try to approximate synchronization. Use a barrier and spin-yield loop instead.

Differential Revision: D9628339

fbshipit-source-id: fef752ad15dbff853cfa7cbaac1081580007754c

Summary: [Folly] Remove some `[[noreturn]]` functions - many of them can be replaced with `throw_exception`.

Reviewed By: Orvid

Differential Revision: D9624966

fbshipit-source-id: e5e472c660677112edf99e30e36d78c1b1718b52

Summary: [Folly] Let `StaticMeta` have a deleted dtor - a compile-time enforcement that the dtor will not be invoked, to replace the existing runtime non-enforcement.

Reviewed By: elsteveogrande

Differential Revision: D9624686

fbshipit-source-id: 9185defbea343e4123e66c8d0d38f20c561aebea

Summary: [Folly] Check the behavior of ThreadPoolExecutor destruction regarding execution or dropping of outstanding tasks.

Differential Revision: D9627237

fbshipit-source-id: 4bb3c1480cc94ceeb3e550f52c298e3d2dcf71c5

Summary:
Contains a subset of the functions described in p1135r0, with some additions
for timed waiting that essentially extends the futex interface to work with
non-standard futex widths

In the regular 32 bit case, we fall back to the existing folly futex()
implementation.  In all other cases, we use folly::ParkingLot to mimic futex()

Reviewed By: djwatson

Differential Revision: D9381922

fbshipit-source-id: faf84e105e1d44a6dd6034e25440fcb3eb664846

Summary: [Folly] Write `/* static */ if` as `if /* constexpr */`. Once the time comes to jump to C++17, all that remains is to remove the comments.

Reviewed By: aary

Differential Revision: D9627826

fbshipit-source-id: 56078e727a3a4420851f1c441783b80da55a8e6c

Summary:
Folly warning correction -- the author clearly intended unsigned math

Fixes #923.

Reviewed By: yfeldblum

Differential Revision: D9508962

fbshipit-source-id: 0ffa1b25f7c427030987cc5ba03c6e7f160a335b

Summary: [Folly] Less duplication in `AtomicStruct` test.

Reviewed By: aary

Differential Revision: D9601770

fbshipit-source-id: c11fe49e081079f4c33b9d80c9b44437202390d9

Summary: [Folly] Cut explicit `decltype`-based return types in `folly/gen/File-inl.h` - they only required pre-gcc49.

Reviewed By: Orvid

Differential Revision: D9601484

fbshipit-source-id: 8750091a9ef3e4ba8b8f4e26a96b28fe8d242e7a

Summary:
[Folly] Pull out a local variable in `MMapAlloc`.

Moves the conditional compilation out of a compilcated expression and into a separate full-statement by itself.

Reviewed By: Orvid

Differential Revision: D9598437

fbshipit-source-id: 770c835f729e72b880aadcefb8aae7ead2754bd9

Summary: Because.

Reviewed By: yfeldblum

Differential Revision: D9568442

fbshipit-source-id: 0a1ecf1904499afa9069d345d70279a527e31b1a

Summary: As a mitigation for an `folly::dynamic` iteration order dependency on iOS.

Reviewed By: yfeldblum

Differential Revision: D9614129

fbshipit-source-id: 09a822a32327fd5389e8e4d169ab3af4f428426c

Summary:
I want to access the list of deps without the install
instructions attached later in this stack of diffs in `shell_builder.py`.

Refs: https://github.com/facebook/watchman/pull/639

Reviewed By: snarkmaster

Differential Revision: D9552419

fbshipit-source-id: 333cfa0c33bc1aa623de7ac3546a8f1785869a4f