Summary:
[Folly] Split out the global `ShutdownSocketSet` singleton into its own library to keep the dependencies of `ShutdownSocketSet` lighter-weight.

In general, globals should be an opt-in sort of thing anyway.

Reviewed By: elsteveogrande

Differential Revision: D6790009

fbshipit-source-id: c68fa2bbaeaf3ff205e0c3b1c739d7561e940e64

Summary:
Previously to use gmock you simply needed to link against libgmock_main.
However, googletest pull request #1339 was recently merged into upstream
googletest: https://github.com/google/googletest/pull/1339

These changes now require explicitly linking against libgmock_main, libgmock,
and libgtest.

Reviewed By: yfeldblum

Differential Revision: D6794709

fbshipit-source-id: 03dcccec966e62240987ee0051dfa87be8614cca

Summary:
The exception_tracer code changes program behavior when you link it in.
Therefore it should not be included in the main libfolly library.

This splits the exception_tracer code out into 3 separate libraries, which
matches the behavior described in the exception_tracer README.md file.

Reviewed By: yfeldblum

Differential Revision: D6787807

fbshipit-source-id: 51400c3ff464d359b4acc56679b5f584f3b586fd

Summary:
Move Benchmark.cpp out of the main libfolly library and into its own
libfollybenchmark library.

This more closely follows the build artifacts produced by the autoconf build,
and will help avoid breaking downstream projects that depend on folly and
expect to find libfollybenchmark.  The code in Benchmark.cpp is also normally
only needed by test programs.

Reviewed By: yfeldblum

Differential Revision: D6793538

fbshipit-source-id: fd273c11fc9f199a159b9e5d14badaf805480db0

Summary: Exported symbol breaks under strict warnings on some mobile builds. Remove export by using anonymous namespace as it is not required.

Reviewed By: yfeldblum

Differential Revision: D6791282

fbshipit-source-id: fd7f8294fdcdc2069cc6fea64c9e269bc094c9f8

Summary: Merge patch is simple method of editing JSON documents. This implementation uses the recursive version documented in the RFC.

Reviewed By: yfeldblum

Differential Revision: D6777104

fbshipit-source-id: 554f801fe793a6fe004a8321ca41510b48225aa9

Summary: as title

Reviewed By: yfeldblum

Differential Revision: D6565911

fbshipit-source-id: 5bed8f44520f6c1d7d6e685bf2a38cf97f734205

Summary: Variable shadowing warning under specific compiler flags. This works around that by renaming.

Reviewed By: yfeldblum

Differential Revision: D6782706

fbshipit-source-id: 60f379f301a88ab370b056469693a198439d1b11

Summary: The original code provided an unsupported alignment for 32-bit ARM builds. This change makes use of hardware_destructive_interference_size, which represents exactly what the alignment field is used for.

Reviewed By: yfeldblum

Differential Revision: D6782366

fbshipit-source-id: b8e2cdf6a0bafdba96d40d729535646b1f6660df

Summary:
[Folly] An `unsorted` tag.

For contexts in which it is desired explicitly to allow, as an optimization, the passing of unsorted containers, where such would ordinarily be assumed to be a pessimization or assumed to be incorrect.

Reviewed By: igorsugak

Differential Revision: D6782860

fbshipit-source-id: 0bc7002306497e8bb0a62c4589d4f243da062ff8

Summary:
Always use the `-std=gnu++14` compiler flag when performing configure-time
checks on Unix-based platforms.

On older versions of gcc (e.g. 5.x) some of the configuration checks
incorrectly fail without this option.

Reviewed By: meyering

Differential Revision: D6788847

fbshipit-source-id: 6e182ff9930a42b01c23f9a0cceda0108052224b

Summary:
Use the `use -Wshadow-compatible-local` flag if the compiler supports it.

This also required marking the gmock include directory as a system include
directory, to prevent the compiler from warning about existing name shadowing
in gmock's header files.

Reviewed By: yfeldblum

Differential Revision: D6787806

fbshipit-source-id: f0e5f6de543a47b19a09440c58ee2961dab23054

Summary:
On unix platforms, check to see if the compiler supports the `-faligned-new`
and `-Wno-noexcept-type` flags before adding them to the compiler command line
flags.

Reviewed By: yfeldblum

Differential Revision: D6787808

fbshipit-source-id: d34af5ae4251ad3639fdaa1a8d5cb2df4b10e986

Summary: A lot of shadowed variables in tests. Simple renaming should suffice.

Reviewed By: yfeldblum

Differential Revision: D6786138

fbshipit-source-id: 22c1c4d7cac13b367ed534a3f1d20714150b39f9

Summary:
This clashes with std::make_optional with -std=gnu++17 giving:
  call of overloaded 'make_optional(std::__cxx11::basic_string<char>)' is ambiguous

Reviewed By: yfeldblum

Differential Revision: D6780579

fbshipit-source-id: fea8c76869e4d9b744fc3182379328a91879b1d2

Summary:
This reverts commit 1249d203df610cb29c16e03f7a06ea90aea80418

bypass-lint

An infra SEV is better than not reverting this diff.
If you copy this password, see you in SEV Review!
cause_a_sev_many_files

Differential Revision: D6745720

fbshipit-source-id: b357d0d8c42388d6f322cbb8f6d8958f7f02df54

Summary:
Log bytes before/after (de)compression to the logging backend. Use the codec name in the key, and for lz4/zstd also include the library version and compression level.

I chose the keys such that each individual piece as <= 15 characters, to be inlined. However, I chose readability of the keys over trying to squeeze the entire key in 15 characters.

Reviewed By: yfeldblum

Differential Revision: D6745720

fbshipit-source-id: 1249d203df610cb29c16e03f7a06ea90aea80418

Summary: Adds an open source counters interface.

Reviewed By: yfeldblum

Differential Revision: D6609118

fbshipit-source-id: cc326443339b88acdd11e4184eb0c82d786732c2

Summary:
Move the coarse_steady_clock definition outside
the c++ < 17 specific defines, as otherwise it's not
defined when using -std=gnu++17.

Reviewed By: yfeldblum

Differential Revision: D6780601

fbshipit-source-id: 35cc5aa10db7d890e17bf03cc5e80803a9356d7a

Summary: Keeping all variables that interact with hazptr_domain::rcount_ signed int to avoid conversion errors.

Reviewed By: yfeldblum

Differential Revision: D6754593

fbshipit-source-id: e283f127a112a529a0e98eb82b6061b44aa9d2ca

Summary:
[Folly] Remove `unsafe` tag and add `presorted` tag.

There are varieties of unsafety, so let us be more explicit about which variety of unsafety is invoked in each case.

Differential Revision: D6758520

fbshipit-source-id: d198a3c7601971460f91acc7787c9da02ae283c0

Summary: folly/memory/Malloc.h was included but not needed.

Reviewed By: yfeldblum

Differential Revision: D6757598

fbshipit-source-id: 241b939724b21a94739e14335ddfaadfcd00dda3

Summary:
Somebody reported compilation issues with the closure in post()'s
assert, resulting in "error: lambda-expression in unevaluated context".
While I haven't been able to reproduce the problem locally, it is easy
enough to work around in this case.

Reviewed By: djwatson, mcallahan

Differential Revision: D6759739

fbshipit-source-id: 9f8082a1e20cd9ddf626cb176542e4e861a7e702

Summary:
[Folly] Use `MemoryIdler` in `SaturatingSemaphore`.

As is used in `Baton`.

And merge the two invocations of `futexWait` and `futexWaitUntil` - `futexWaitUntil` also tests for the max-deadline internally.

Reviewed By: djwatson

Differential Revision: D6720045

fbshipit-source-id: a48187a6c866dbf99bb5c7283e0288b939bef2e5

Summary:
[Folly] Handle max deadlines in `Futex`.

Some of the synchronization code internally treats deadlines which are equivalent to `time_point::max()` for the same clock as a sentinel value indicating a deadline at infinity, or equivalently the lack of a deadline.

Care must be taken when converting between clocks to translate a deadline at infinity for one clock to the deadline at infinity for the other clock.

Reviewed By: nbronson

Differential Revision: D6720021

fbshipit-source-id: cfc230dd2d8db55297385a4afcb6d87ae4221840

Summary: Adds a TimedDrivableExecutor implementation of DrivableExecutor that adds a driveUntil method. driveUntil is as drive, except that it takes a timepoint and will stop driving after that time to allow callers to time out more easily.

Reviewed By: yfeldblum

Differential Revision: D6658320

fbshipit-source-id: a75145748e78497ce107ae152f25729547883835

Summary: [Folly] Fix copyright line in `folly/synchronization/test/ParkingLotBenchmark.cpp`.

Reviewed By: andrewjcg

Differential Revision: D6758502

fbshipit-source-id: cae2a79940c7c9cc58c29977141199ab1e902081

Summary:
I believe the CMake build scripts have a similar level of functionality to the
autoconf-based build scripts even on Linux these days.  This lets users use
CMake on Linux and Mac, rather than directing them to autoconf instead.

Reviewed By: meyering

Differential Revision: D6745366

fbshipit-source-id: 0361eecead55ee06269192eee8d2e7286eb182b8

Summary:
The compression test code has a large number of parameterized tests that run
with a large number of parameter combinations.  These tests take many minutes
to run.

Reviewed By: meyering

Differential Revision: D6745364

fbshipit-source-id: dac5d5eb4a786da7be453742fac5f92a9740e468

Summary:
CMake 3.9+ includes built-in support for gtest.  This updates the CMake build
scripts to make use of this if the GoogleTest module is available.

Reviewed By: meyering

Differential Revision: D6745369

fbshipit-source-id: 1ef978874b9a0ef2cc5f48ab1c7a0b55d0f1155e

Summary:
The CMakeLists.txt file finds the sources and headers for the main folly
library by finding all *.cpp and *.h files, and then excluding specific ones.

The CMakeLists.txt file was originally written for Windows builds, and it was
hard-coded to exclude a number of files that do not build on Windows.   This
updates the file to properly check for the dependencies, and build these files
if their required third-party dependencies are available.

Reviewed By: meyering

Differential Revision: D6745368

fbshipit-source-id: 3ee04d54147a68c482aab50d30bc9fe2a4134eef

Summary:
Update the CMake build files to perform additional checks to set configuration
macros in folly-config.h

I believe this should largely bring the CMake build on-par with (or even better
than) the autoconf build scripts.  I believe that the CMake build scripts now
perform all of the checks necessary to set macros in folly-config.h correctly.

The autoconf-based configure script also appears to have a number of bugs:
in several places it accidentally uses different macro names than the ones
checked in the source code.  Some of it's checks are also broken, and fail to
detect features correctly due to compilation errors in the check.

Reviewed By: yfeldblum

Differential Revision: D6735699

fbshipit-source-id: 5ce48f1deddd63c9d52fcccd5d5ccf6ca35e9a0d

Summary:
Both the autoconf and cmake build scripts check for
`cplus_demangle_v3_callback()` and define
`FOLLY_HAVE_CPLUS_DEMANGLE_V3_CALLBACK` appropriately.

Reviewed By: meyering

Differential Revision: D6745365

fbshipit-source-id: 3020593c60a21568781b835490b8d64913366cb9

Summary:
Following on from D6755842; we don't have to repeat as
much of the internals of `readFixedString`, so... don't!

Reviewed By: yfeldblum

Differential Revision: D6756062

fbshipit-source-id: db3e4fd62e48bf155a656ee57df84274021027f7

Summary:
D6635325 exposed a long standing issue with the way
that we were consuming Cursor::length, so let's fix it up!

More details are in the new unit test for this!

Reviewed By: spalamarchuk

Differential Revision: D6755842

fbshipit-source-id: f8b20406c32682892791e7375be577d54d52e0ad

Summary:
[Folly] Improve `SingletonThreadLocal` performance.

By explicitly controlling inlining behavior.

The ctor is definitionally cold - once per process - so outline.

`get` is hot so inline. Uncached `get` is cold - once per thread - so outline uncached.

Reviewed By: djwatson

Differential Revision: D6736662

fbshipit-source-id: 4cd77c7772b46e2e3c6b2a3dc071b2b06522979e

Summary:
- Fix the locations of some tests that have been moved.
- Remove some tests that have been deleted.
- Comment out some tests that depend on parts of folly that are not currently
  built by the CMake build scripts.
- Fix a build error in CompressionTest.cpp if FOLLY_HAVE_LIBZ is not defined.

Reviewed By: yfeldblum

Differential Revision: D6735700

fbshipit-source-id: 89f60751fa7079b2c609d23d85fbed2a0f317b55

Summary:
DeterministicScheduleTest.cpp contained several single-line C++ comments that
ended in a trailing backslash.  This makes the preprocessor treat the following
line as a comment as well, even if it does not start with `//`.  Newer versions
of gcc emit warnings about this.

This changes the comment in DeterministicScheduleTest.cpp to use `/* */` to
avoid this issue.

Reviewed By: siyengar

Differential Revision: D6735672

fbshipit-source-id: 162c735507a643ce0dbee58f1f054865237e1eba

Summary:
A couple of the test functions in AsyncSSLSocketTest maintained two EventBase
objects and alternated looping between them.  In some cases it would call
EventBase::loopOnce() even when there was no work to do.  This call normally
blocks until an event is ready.  This happened to work when using libevent1,
but this appears mostly accidental: with libevent1 EVLOOP_ONCE causes the loop
to break out even after an "internal" I/O event; in libevent2 EVLOOP_ONCE only
breaks out after a non-internal event has occurred:
https://github.com/libevent/libevent/commit/0617a818204397790e5e4c9bcb9e91ae5ea7817a

In these tests it turns out that the internal EventBase NotificationQueue
always gets triggered the very first time loopOnce() is called, preventing
these tests from hanging when using libevent1.

This fixes the hang when using libevent2 by removing the initial loopOnce()
calls that potentially have nothing to do.  This also consolidates the 2
EventBase objects into one to avoid having to alternate loopOnce() calls
between them without knowing which one actually has work to do.

This also fixes an issue where the code never checked the return value of
`recv()`

Reviewed By: yfeldblum, siyengar

Differential Revision: D6735669

fbshipit-source-id: 5f36106a08866aa8908e82263f83a606399cdf79

Summary:
Update ShellTest and PromiseTest to suppress warnings about using deprecated
functions in the tests for those functions.

Reviewed By: yfeldblum

Differential Revision: D6735670

fbshipit-source-id: 89edcb49d1eff3132398aaef88f5a5cae82e3557