Summary:
Update `add_thrift_cpp2_library()` to pass in the correct `-I` flags when
invoking the thrift compiler so that it can find all of the other thrift files
that this library depends on.

D16062657 was a previous attempt to do this, but suffered from a few problems:
- It required all dependencies to be defined before
  `add_thrift_cpp2_library()` was called.  This requires users to carefully
  order their CMake files and subdirectory include ordering.
- It only handled one level of dependencies, and did not propagate include
  paths for deeper dependencies.
- It set the include path for dependencies to the source directory path where
  the dependency was originally built, rather than the directory where the
  thrift file for that dependency would be installed.

This change does require CMake 3.8+.  Previous versions of CMake do not
support using generator expressions to generate multiple arguments for a
custom command.

Reviewed By: strager

Differential Revision: D17005381

fbshipit-source-id: 31190beba94b4d1010445375a5e2791450230f7d

Summary: Allow futures::when to pass through a SemiFuture-returning function.

Reviewed By: yfeldblum

Differential Revision: D17001974

fbshipit-source-id: dbe8b347f0a4c3fd19774c68c4e58e3b523b971f

Reviewed By: yfeldblum

Differential Revision: D17086382

fbshipit-source-id: 318834a1d82025bc0c34bcf7a95fedfffdb02ddb

Summary: times is hard to use with SemiFutures, leading to potential use of inline executors just to make it work. This adds native support.

Reviewed By: yfeldblum

Differential Revision: D16992774

fbshipit-source-id: 483110d923ca51e037439ccc80173ffa9299cd64

Summary: Use FOLLY_CL_USE_FOLLY_TLS for CacheLocality to avoid an iOS build issue

Reviewed By: mzlee

Differential Revision: D17085507

fbshipit-source-id: acd407c9e0045eb4d8a59348a20874dbe75fd651

Summary: Earlier change to duration waiting broke propagation of the interrupt handler. This change correctly propagates it into the new future that is returned.

Reviewed By: yfeldblum

Differential Revision: D17061618

fbshipit-source-id: b228221acbfab3ae94118c1197a485e01aa2e41e

Summary: whileDo is hard to use with SemiFutures, leading to potential use of inline executors just to make it work. This adds native support.

Reviewed By: yfeldblum

Differential Revision: D16988569

fbshipit-source-id: abaf36180d6ff8a5277eebb277f7f0a254315d36

Summary:
All of the requisite headers are now open sourced and eden
has been converted to use them. This removes any logic that references
this directory and kills the now unused cmake file.

Reviewed By: chadaustin

Differential Revision: D16994732

fbshipit-source-id: 573b8b50540ee64590682be2a54aa94659f12368

Summary:
Most stat code in fbcode was moved in to open source under
fbcode/fb303. The only exception that we use internally is the
MonotonicCounter class. This diff moves all of our stats code to use
the open source headers and updates cmake files to pull in the open
source fb303.

Reviewed By: chadaustin, shri-khare

Differential Revision: D16969960

fbshipit-source-id: 12b7abb54c956c242c8e27eb69fd96925c7e61f7

Summary:
Latest and C++17 are all we currently intend to support.

Created from Diffusion's 'Open in Editor' feature.

Reviewed By: yfeldblum

Differential Revision: D17053747

fbshipit-source-id: 7ef2404b82242e363c9ccf1c5d7136eb52f356dc

Summary: In preparation for making TimeKeeper::at and TimeKeeper::after return SemiFutures to make more explicit the need to keep work off of the TimeKeeper's executor, add *Unsafe versions of both functions to migrate code to.

Differential Revision: D17052948

fbshipit-source-id: 4fb138862e417f02746ad4eaf71f091d37302e7a

Summary:
Fixing a comment in Evicting Cache Map, no functional code change.

(Note: this ignores all push blocking failures!)

Reviewed By: yfeldblum

Differential Revision: D17051293

fbshipit-source-id: 7a1197790bd9a0905934888dabeecde9f7c9c165

Summary:
Update add_thrift_cpp2_library() to add a PUBLIC_HEADER property to the
generated library target, so that the generated headers can be installed using
an `install()` call.  Also add a `HEADER_INSTALL_DIR` property which indicates
the directory they should be installed into.  A `INCLUDE_DIR` argument was
added to customize the include installation path, should anyone care to do so.

This also removes code that was previously incorrectly installing the
generated headers into the source tree.

Reviewed By: wez

Differential Revision: D16853404

fbshipit-source-id: 6f640b2bd347c99804e074fca0209dda37c8a9cf

Summary:
`folly::detail::std_pmr` uses either `std::pmr` or `std::experimental::pmr`.

"Polymorphic Memory Resources" has been standardized in C++17, but `pmr::resource_adaptor` was [left behind](https://github.com/cplusplus/papers/issues/33), which means `resource_adaptor` is not available when a C++17 ready standard library is detected by folly.

This commit reimplements `test_resource` without using the non-standard adaptor.

```
folly/test/sorted_vector_test.cpp:862:31: error: ‘folly::detail::std_pmr::resource_adaptor’ has not been declared
  862 | using folly::detail::std_pmr::resource_adaptor;
      |                               ^~~~~~~~~~~~~~~~
```
Pull Request resolved: https://github.com/facebook/folly/pull/1207

Reviewed By: nbronson

Differential Revision: D17003049

Pulled By: yfeldblum

fbshipit-source-id: 7bcd5b4bb4368366cd57d89b9ef88deaaff808d6

Summary: Previous within changes changed how long the executor keepalive existed for. This explicitly grabs the executor keepalive before calling within to ensure it still exists when we try to use it in `via`.

Reviewed By: LeeHowes

Differential Revision: D17054622

fbshipit-source-id: 7826c6ac0ad332a8f5f1331cd2d798619cf318c3

Summary:
The external Travis CI builds for fbzmq are still using the older
fbcode_builder spec (as opposed to the newer getdeps manifest file).

D16577367 moved the CMakeLists.txt file to the top-level directory, but the
fbzmq spec file was still looking for it in the fbzmq subdirectory.

Reviewed By: jstrizich

Differential Revision: D17005361

fbshipit-source-id: 3f7664eadfb60ec7606124a14445b44ae586b8a7

Summary:
Fix the fbzmq pathmap listed in its manifest file to match the path map
actually used by ShipIt.  The fact that this was broken was why internal
getdeps builds did not detect that D16577367 broke the build.

Reviewed By: wez, jstrizich

Differential Revision: D17005360

fbshipit-source-id: 046ff58ad70c03b860c3fccebaba975808df244d

Summary:
Update ThriftCppLibrary.cmake to record that the output depends on the thrift
`cpp2` template files.  The `THRIFT_TEMPLATE_FILES` variable was defined in
D16062657 but doesn't appear to be used anywhere.  This uses it, and also
updates it to only match the C++ template files.

Reviewed By: wez

Differential Revision: D16738442

fbshipit-source-id: aa4097e9ec1d009ef1e3ee2efd03ffa19a82ed12

Summary:
Add explicit double quotes around arguments that are intended to be exactly a
single parameter.  Also line wrap to 80 characters.

Reviewed By: wez

Differential Revision: D16738443

fbshipit-source-id: b8c9b6d50da72b44e23eaf5effbc384b6cbbc1c0

Summary:
Change ThriftCppLibrary to use `fb_cmake_parse_args()`

This code doesn't really care much about handling empty arguments, so we could
use the standard `cmake_parse_arguments()` function here instead of
`fb_cmake_parse_args()`.  However, it is slightly more convenient that
`fb_cmake_parse_args()` automatically errors out on unhandled arguments, so
that we don't have to check for this ourselves.

Reviewed By: wez

Differential Revision: D16738445

fbshipit-source-id: 67b9761f2ceaf7665bd336290bb44af32fec6f4a

Summary:
The manifest file for iproute2 previously listed the commit to check out as
7ca63aef7d1b0c808da0040c6b366ef7a61f38c1.  However, this is not a commit, but
a tag object that refers to commit 92a0236a3cdf3438000834121b7ea8a09f1f52b1.

This caused getdeps to think that iproute2 was always out-of-date, even when
it was already on the correct commit, since it was comparing current commit ID
against the tag ID.

This updates the manifest to refer to the commit ID instead of the tag ID.

Reviewed By: shri-khare

Differential Revision: D17005418

fbshipit-source-id: c7145c73b66ae93a2e9097ddcf8c53237b135d32

Summary: Enable FOLLY_TLS on FOLLY_MOBILE too

Reviewed By: guangyfb

Differential Revision: D16883165

fbshipit-source-id: 1a8f0991088f6963dc2acf84b74b294be998b877

Summary: [Folly] Avoid `__forceinline` for `catch_exception` under MSVC, which warns about functions which contain `try`-and-`catch` blcoks having the `__forceinline` modifier.

Reviewed By: akrieger

Differential Revision: D16982707

fbshipit-source-id: 68c443c4ce8ca77edd49d509a88ef4b0ab9488a9

Summary:
The definition of RLockedPtr should use a non-const Subclass type, and not a
const one.

Reviewed By: ot

Differential Revision: D15356827

fbshipit-source-id: b8ad41e263f0e15ffa25b0698aa85eab8ca2ccb8

Summary: This moves within to be in a more logical spot. In the parent diff we kept it where it was to make it easier to see the differences.

Reviewed By: LeeHowes

Differential Revision: D16967106

fbshipit-source-id: 9f9cd2ea38a996ac12d3ca8256c1ec050d57dfc0

Summary:
This fixes a deadlock bug where the after continuation runs inline.

We resolve this by using defer to delay execution until both futures are created thus avoiding any extra synchronization.

Reviewed By: LeeHowes

Differential Revision: D16952748

fbshipit-source-id: a88a40d3135bdabc43bb51f9b5ea072f8e6564a3

Summary:
`ConcurrentHashMap::insert_or_assign` does not follow the interface for `std::map::insert_or_assign`.  Making this clear for future users to avoid confusion.

Code:
```
int main(int argc, char** argv) {
  folly::ConcurrentHashMap<int, std::string> map;
  std::cout << "Insertion took place?: " << map.insert_or_assign(1, "hey").second << std::endl;
  std::cout << "Insertion took place?: "
<< map.insert_or_assign(0, "wow").second << std::endl;
  std::cout << "Insertion took place?: "
<< map.insert_or_assign(1, "wow").second << std::endl;
}
```

Output:
```
Insertion took place?: 1
Insertion took place?: 1
Insertion took place?: 1
```

Also see: https://github.com/facebook/folly/blob/master/folly/concurrency/test/ConcurrentHashMapTest.cpp#L86-L87

Reviewed By: magedm

Differential Revision: D16967939

fbshipit-source-id: ce0d32813371b31a94e14e404665d4fb2e7ffdfe

Summary:
Adds folly::coro::sleep() function as an alternative to using folly::futures::sleep().

The coro version returns a Task<void> and supports cancellation of the sleep operation when awaited within another Task.

Reviewed By: kirkshoop

Differential Revision: D16816328

fbshipit-source-id: 46bc4ee2475e6bd0bdfd0f7f30f3e0f1ea54d4d5

Summary:
The `folly::coro::Task` coroutine type now has an associated `CancellationToken` that is implicitly passed down to child operations that it awaits.

This is a first step towards supporting cancellation of persistent async streams.

This adds a new `co_withCancellation()` customisation point that awaitable types can customise to allow them to opt-in to cancellation. Currently only `Task` customises this operation.

Also provided a new `co_current_cancellation_token` object that can be awaited within a `Task` to retrieve the current `CancellationToken`.

Note that I have not yet hooked up the `Future` or `SemiFuture` to integrate with this cancellation mechanism (most `Future`-based code is not cancellation-aware). So a coroutine that is currently suspended awaiting for a `Future` may not currently respond to a cancellation request.

Reviewed By: andriigrynenko

Differential Revision: D16610810

fbshipit-source-id: 72a31d7a3ba4c281db54c1942ab41d4ea2f34d21

Summary: `LockFlags` is a set of flags that mirrors `mlock2(..., int flags)`, but since this is not a C API we don't need a bitset, we can just use a more idiomatic struct of bools (also used for the other options in the class). Furthermore, having an entry with value 0 (`LOCK_PREFAULT`) does not make sense in a bitset.

Reviewed By: yfeldblum

Differential Revision: D16900127

fbshipit-source-id: 6477854121c0626e0f36cb7a50d50df73323bd4e

Summary:
This simplifies things for the OSS CI situation in
the short term, especially since Eden isn't quite buildable
or usable outside FB at this time.

Reviewed By: chadaustin

Differential Revision: D16953346

fbshipit-source-id: 028150bb3cfc9a8ccbe1197321214b56ad359463

Summary: [Folly] Drop workaround for clang-3.6 in `Range` ctor.

Reviewed By: gkmhub, Orvid

Differential Revision: D16945307

fbshipit-source-id: d70d7560375d0c020b19fbac227767605459a834

Summary:
bzero is deprecated and can be compile time disabled for uClibc-ng
Pull Request resolved: https://github.com/facebook/folly/pull/1195

Reviewed By: Orvid

Differential Revision: D16451837

Pulled By: yfeldblum

fbshipit-source-id: 929a8e8cd7f8ddb3a904c1b1956a5f8ca115244f

Summary:
Simplified the interface for consuming an AsyncGenerator to now just have a single async next() method instead of an iterator-based API.

The iterator-based API was added to integrate with the 'for co_await' syntax present in the Coroutines TS, however this syntax has been removed from C++20 to allow for future exploration of the AsyncRanges design-space.

The `co_await gen.next()` expression produces an optional-like object that lets you query whether the result is a sentinel or contains a value.

Old:
```
Task<void> consume(AsyncGenerator<T> gen) {
  for (auto it = co_await gen.begin();
       it != gen.end();
       co_await ++it) {
    use(*it);
  }
}
```

New:
```
Task<void> consume(AsyncGenerator<T> gen) {
  while (auto item = co_await gen.next()) {
    use(*item);
  }
}
```

Reviewed By: andriigrynenko, kirkshoop

Differential Revision: D16586151

fbshipit-source-id: 4b0bf31ba9291d894a18e9553513eddee0cde33a

Reviewed By: Orvid

Differential Revision: D16640245

fbshipit-source-id: 3a184e4d877ea27a9400de5993b494095f6bd5e5

Summary:
does not affect the github build.
this is for fb CI

Reviewed By: dddmello

Differential Revision: D16935982

fbshipit-source-id: 61656fa600f19438b5aa89486486ed4ee103dea4

Summary:
folly::Hash did not work with pointer-like types like std::unique_ptr<T>,
std::shared_ptr<T> and T*.  Add specializations for those

Reviewed By: yfeldblum

Differential Revision: D16134842

fbshipit-source-id: 78d3cf9c6f5ef4f49b008c0d1c489d3c6203ba89

Summary: As far as I can tell, folly/test/FBVectorTestUtil.h does not need to include folly/Benchmark.h. Move it to folly/testFBVectorBenchmark where it is actually used.

Reviewed By: yfeldblum

Differential Revision: D16931137

fbshipit-source-id: 8ef5f99a783537672d55883adadd08270e318a61

Summary: Fix : iterating through ConcurrentHashMapSIMD results in infinite loop

Reviewed By: nbronson

Differential Revision: D16923826

fbshipit-source-id: c8b98ef13034240c162c155cf0e5c3f097b73c7f

Summary: Underflow/overflow of signed integers is fraught with dangers. So this diff removes the potential for overflow while adding or subtracting buckets in folly stats.

Reviewed By: yfeldblum

Differential Revision: D16898755

fbshipit-source-id: 4d3df1024b4c01ea0b276278105071e62e27fa27