Summary:
[Folly] Fix waiting in `UnboundedQueue::dequeue` suite.

`SaturatingSemaphore::try_wait_until` does not return early with the result `false`, so the loop could result in incorrect long waits.

Reviewed By: magedm

Differential Revision: D7151562

fbshipit-source-id: cd90583f0b4520464ed1877df8396df43ebbef00

Summary: [Folly] Simplify `MemoryIdler` pre-idle check.

Reviewed By: magedm

Differential Revision: D7151565

fbshipit-source-id: 34ae69f16439640669cd9aaf02a09282a1a1cc3f

Summary: [Folly] An extra deadline check in `DynamicBoundedQueue` enqueue path just for completeness.

Reviewed By: magedm

Differential Revision: D7151563

fbshipit-source-id: 2d6abd906091db20a650d0f3120bf4b1d8bcf00c

Reviewed By: igorsugak

Differential Revision: D7078903

fbshipit-source-id: 13cdc49369f24cdadc3f9405d1ce609a79ff8988

Summary:
Adding a few other data structures to the benchmark. Code clean-up:
* split `insert` into `insertFront` and `pushBack`
* delete current `erase` benchmark, which is mostly spinning since `iters` can
  easily be larger than the original vector size.

Reviewed By: yfeldblum

Differential Revision: D7067000

fbshipit-source-id: 3073f7c396888787b49993468c7e6fdac70b77ac

Summary:
[Folly] Remove the spin-lock protecting `Future`'s executor.

The executor can be set in a few places:
* When constructing a new `Promise` and `Future` pair before handing off the `Promise` in `Future::thenImplementation`.
* After invoking `SemiFuture::wait` and `Future::wait` in the non-timeout case.
* In `SemiFuture` dtor, if it has a core.

In the first case, the executor is set in the future thread before being read by the promise thread. In the second case, the executor is set after being read by the promise thread. In the third case, if there is a core, then no callback could have been attached. But there is no race between setting and reading.

Reviewed By: djwatson

Differential Revision: D7115700

fbshipit-source-id: 5a0f90a9f01a7dcf295f39d323959e91aeae26da

Summary:
This reverts commit bf3e2b8f4a086f1786ab46f453c3dd9171d018e8

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:
D7130814

Original commit changeset: bf3e2b8f4a08

fbshipit-source-id: 8f67c9ec365853f8fbc736e0fd29133fd7653a59

Summary:
C++17 defined integer traits for `__int128` as well as a (trivial) std::hash,
this diff adds the check in `FOLLY_SUPPLY_MISSING_INT128_TRAITS`.

There was an unintended linebreak in the cmake test which rendered it non
functional. This diff fixes it.

Original issue:
https://github.com/facebook/folly/commit/b2b96f59c57cd7aba686cc4f61ceba0314cdeb72#comments

Reviewed By: yfeldblum

Differential Revision: D7138006

fbshipit-source-id: ca1841b9ca847f1f6570b58e95380f50fe092345

Summary:
From http://en.cppreference.com/w/cpp/string/basic_string/at

> Throws std::out_of_range if pos >= size().

Furthermore it was inconsistent between the `const` and non-`const` version.

(Note: this ignores all push blocking failures!)

Reviewed By: philippv, luciang

Differential Revision: D6355911

fbshipit-source-id: 54acbba791fc5a8aeb4fdf46e786f8519fd18701

Summary: Replace calls to Promise::getFuture in waitImpl with getSemiFuture. There is a slight behavioural change here in that we now set the executor on the returned future, but this appears to be the correct behaviour.

Reviewed By: yfeldblum

Differential Revision: D7104627

fbshipit-source-id: fd19c3f6884b560f7d5ea1276f3c80c082dfc53d

Summary:
SharedMutex asserts that all locks have been released before
destruction.  This diff adds a comment near those asserts making it more
clear what they are checking.

Reviewed By: yfeldblum

Differential Revision: D7137906

fbshipit-source-id: 082a804616950d9a962ee932c9021c453f43a35d

Summary:
Suspending the coroutine before it's destroyed prevents a dangling
reference to its value.

This dangling reference is exposed when running tests that were
built with `-O3` with ASAN. To run tests at this level, split the
tests up: move tests that cannot be compiled with ASAN at `-O3`,
due to https://bugs.llvm.org/show_bug.cgi?id=34289, into their
own file. The remaining tests stay where they are, with `-O3`
re-enabled.

Reviewed By: yfeldblum

Differential Revision: D7130814

fbshipit-source-id: bf3e2b8f4a086f1786ab46f453c3dd9171d018e8

Summary:
This targets Fedora specifically. More details are available in #753

I personally do not think this is the best way to handle this, but it's something (and works). Still, there might be a chance for this to get merged in? Thank you!

/cc yfeldblum
Closes https://github.com/facebook/folly/pull/789

Reviewed By: simpkins

Differential Revision: D7111531

Pulled By: yfeldblum

fbshipit-source-id: 508aeeeb7bfaf2402150cd33f7d6c8b726539053

Summary: CHECK(ev->ev_base) so we get a proper message instead of just a SIGSEGV

Reviewed By: yfeldblum

Differential Revision: D7118625

fbshipit-source-id: 9426ac54fc32e0d34ad36df97708e3f0ae6043a9

Summary:
`FB_LOG_RAW()` is similar to `FB_LOG()` but allows the caller to pass in the
log level as a variable, and to specify an alternate file name and line number.

This is useful for callers that wish to implement their own logging utility
functions that log a message, but pass through their caller's file name and
line number.

Reviewed By: wez

Differential Revision: D7128091

fbshipit-source-id: 1fec158a9312b9c9dc53cf3dc87004d42f9806c6

Summary: Add hashers for signed and unsigned int128 for platforms that have them.

Reviewed By: yfeldblum

Differential Revision: D7101875

fbshipit-source-id: ab5df6d06c7f292204318e479d172560ae2a4ec6

Summary:
* remove the redundant `!defined(_WIN32)` condition;
* llvm added traits for (u)int128 in
  https://reviews.llvm.org/D2917; and std::hash in
  https://reviews.llvm.org/rL266587.

Reviewed By: nbronson

Differential Revision: D7111138

fbshipit-source-id: 91a05354846575677eddd48c8b8f4e05c53b01cb

Summary:
operator()() const uses const_cast to forward its implementation
to operator()(), which invokes UB when writing to the internal state.
This change marks the internal state mutable, which means we can delete
the const_cast.

Reviewed By: yfeldblum

Differential Revision: D7089568

fbshipit-source-id: 09f726e6399a95987075d6170ce6fb8103189552

Reviewed By: yfeldblum

Differential Revision: D7111876

fbshipit-source-id: eba9e29321e0ac89084ceae410bdcb4ebb86f91c

Summary: [Folly] Switch away from using the legacy `Synchronized` macros within Folly.

Reviewed By: simpkins

Differential Revision: D7118324

fbshipit-source-id: 328ecdd572d84bb99a28ddb8689bdc4ae08421a6

Summary:
[Folly] Cut build config items for `bits/functexcept.h`.

Folly no longer uses the non-portable functions declared in that internal libstdc++ header.

Reviewed By: mzlee

Differential Revision: D7119064

fbshipit-source-id: 6879dc6a5bc490726b188d65d7686a2eca136980

Summary:
Removing calls to folly::Promise::getFuture from Future-inl.h's simpler cases. Replacing with getSemiFuture.

In the case of the collect variants I continue to return a Future, completing inline, until those functions are modified to return SemiFuture.

Reviewed By: yfeldblum

Differential Revision: D7103938

fbshipit-source-id: 3737887a934cd0fe8f7c1511ae2ba252ea047a49

Summary:
Some OSes do not define `IP_MTU_DISCOVER` or `IPV6_MTU_DISCOVER`. As such, this would result in the function argument parameter `df` being unused, which is a warning that is then treated as an error.

Earlier today (2806dda4), this logic was added about setting the DF which broke Mac builds.
Closes https://github.com/facebook/folly/pull/791

Reviewed By: igorsugak

Differential Revision: D7116863

Pulled By: yfeldblum

fbshipit-source-id: 5092891c8977a44ab58723f8cef352dd4eaa1210

Summary:
Exposed by UBSAN:
{P59121025}
{P59121310}
{P59121558}

Add appropriate checks to avoid the UB.

Reviewed By: yfeldblum

Differential Revision: D7112776

fbshipit-source-id: 82bd9f85ed4c82aa1b030a38d6ad9358e8f2d38a

Summary: Some application requires IP not to fragment the the datagram. Add an API to AsyncUDPSocket to set such option.

Reviewed By: siyengar

Differential Revision: D5421406

fbshipit-source-id: 6cd3ab262f1420e22eb0948e0e2bfef77b7b6e92

Summary:
Introduce a specialization for `std::vector<bool>` as the existing
specialization for "other ranges" is not sufficient for binding the
proxy iterator (`bit_const_reference`) to an lvalue when iterating over
the `vector<bool>`.

I do not think you can simply change the type from `const auto&` to `auto&&` when iterating over the container for the "other ranges" specialization.  This is because we cannot bind an rvalue to an lvalue reference (which is the function argument type for our `construct` specializations).

See #752 and https://github.com/facebook/folly/pull/756 for more info.
Closes https://github.com/facebook/folly/pull/781

Reviewed By: andrewjcg

Differential Revision: D7078659

Pulled By: yfeldblum

fbshipit-source-id: 0089183a3c68d20ed14e483859e950dfb4ae729e

Summary:
Add a find_package module for Snappy
Closes https://github.com/facebook/folly/pull/783

Reviewed By: simpkins

Differential Revision: D7079554

Pulled By: yfeldblum

fbshipit-source-id: bf5dc3f3c37367f43fcbf8b40aaa3bb0a030bee5

Summary:
Previously, there are a number of tests in `FBVectorTestBenchmarks.cpp.h` that
are not used anywhere. This diff separates out the tests from the benchmarks
and actually include them in `FBVectorTest.cpp`.

Reviewed By: yfeldblum

Differential Revision: D7103453

fbshipit-source-id: 9427bb1ddcebefb2bbd2c91707fdd572890dc42e

Summary:
getOpenSSLNumericVersion was not static, while getOpenSSLLongVersion() was.
Rather than change it to static, these functions should simply be free
functions.

Reviewed By: yfeldblum

Differential Revision: D7094066

fbshipit-source-id: 808a9d169100c9d94d466d9348418a4e8a50c751

Summary: [Folly] Tweak throw_exception condition, fixing reference to `__GNUC__` and restructuring to make adding checks for alternative compilers more trivial.

Reviewed By: mzlee

Differential Revision: D7102307

fbshipit-source-id: e4e00ded71f37db8fa93822744b608b42960a58a

Reviewed By: yfeldblum

Differential Revision: D7091797

fbshipit-source-id: cbba7e5c17e1b6d4446570fb7a2b888db8bcd17e

Summary:
Re-committing.  Original: D6993857 revert: D7051998

Fixes for hazptr deletion on map destruction.
Several iteration cases don't properly release their hazard pointers.
This isn't disastrous, but means objects may stick around longer than necessary.
Adds tests and fixes for iteration to ensure we eagerly reset all hazard pointers.

Reviewed By: yfeldblum

Differential Revision: D7063727

fbshipit-source-id: 2ae32ead4965b37866096d2a8c6ea8c42c201335

Summary: [Folly] Let `to_signed` be `constexpr` under C++11 rules.

Reviewed By: simpkins

Differential Revision: D7079545

fbshipit-source-id: 69a56f2180f9ec3492cd1ad9cd26dd8bba255442

Summary:
CMake find_package modules are case sensitive. Since the script is called
"FindLZ4.cmake" the corresponding call to `find_package` must match LZ4
and not "lz4".

For an example of the problem, see the [Travis Log](https://travis-ci.org/facebook/folly/jobs/345661072). Namely:

```
CMake Warning at CMake/folly-deps.cmake:101 (find_package):
  No "Findlz4.cmake" found in CMAKE_MODULE_PATH.
Call Stack (most recent call first):
  CMakeLists.txt:65 (include)
CMake Warning (dev) at CMake/folly-deps.cmake:101 (find_package):
  Findlz4.cmake must either be part of this project itself, in this case
  adjust CMAKE_MODULE_PATH so that it points to the correct location inside
  its source tree.
```

This was not caught on my local machine as I use case-insensitive options in my terminal; in addition, this is not a "hard error" for CMake, so the builds happily continued successfully when 7dc5a4ed landed.
Closes https://github.com/facebook/folly/pull/782

Reviewed By: simpkins

Differential Revision: D7079535

Pulled By: yfeldblum

fbshipit-source-id: dd51d8c6ffa804be72c2d9cd264890280dcf5ab9

Summary: [Folly] Cut `folly/portability/BitsFunctexcept.h`.

Reviewed By: simpkins

Differential Revision: D7066504

fbshipit-source-id: ed260ab36759a58dee103addd92c6a5a47dac330

Summary: Add DECLARE/DEFINE_uint32 to the portability layer

Reviewed By: yfeldblum

Differential Revision: D7085534

fbshipit-source-id: 3f6f1bf79371b052706f4b3a03dca1d503b879da

Summary:
folly::dynamic's operator[] was documented as never invalidating
iterators.  In the object case when a key is implicitly inserted the
underlying unordered_map can rehash, which does invalidate the iterators.
This diff amends the comment to reflect this case.

Reviewed By: yfeldblum

Differential Revision: D7085861

fbshipit-source-id: 41ce0497bc60dba9f4529d10010f3b92f9a6c2b3

Summary:
Adds a find_package module for Zstd.
Closes https://github.com/facebook/folly/pull/785

Reviewed By: pixelb

Differential Revision: D7080036

Pulled By: yfeldblum

fbshipit-source-id: 018ff087df725de5344a245dea64ce1b813f6938

Summary: We are going to enable `-Werror=unused-parameter` flag and I need to manually fix some files so we rest of this process can be automated with a tool called clang-tidy.

Reviewed By: yfeldblum

Differential Revision: D7071617

fbshipit-source-id: 0165d9c79834b479ad0f598ea64404a86f47dcc6

Summary:
[Folly] `to_signed` and `to_unsigned`, for casting a value to the signed or unsigned version of the value's type.

And use them in time conversion functions.

Reviewed By: markw65

Differential Revision: D7020215

fbshipit-source-id: 47a6aeeea487cd7d59d23e7ded40cc66dcc57c52