Summary: Skip the tests if the backend is not avaialable

Reviewed By: kevin-vigor

Differential Revision: D25724617

fbshipit-source-id: 0981f69aca02d7d2b1576df4d82e4ed1167d2935

Summary: Try to allocate all the EventBase instances first before running the test

Reviewed By: kevin-vigor

Differential Revision: D25720889

fbshipit-source-id: 93c837e68771f1ef44e80865bec260813158c6b3

Summary: Let `AsyncPipe::create` return the correct pipe type, namely, the type on which it is a member rather than a different instantiation of the template.

Reviewed By: iahs

Differential Revision: D25717180

fbshipit-source-id: 94a5a657e83b5d4cac866277ec5925c0b5b0af28

Summary: Using std::optional requires including it first.

Reviewed By: yfeldblum

Differential Revision: D25704383

fbshipit-source-id: 755dfd4a6dec9695cb0ed156166d13b550fd8b40

Summary:
Adds a new awaitable that extracs the current async stack-trace as a vector
of program counters from within the current coroutine.

Usage:
```
std::vector<std::uintptr_t> programCounters =
  co_await folly::coro::co_current_async_stack_trace;
```

Reviewed By: andriigrynenko

Differential Revision: D21130683

fbshipit-source-id: bf67a9969f73bdb8b91b4cc2858883b8e87762e2

Summary: Defined new callback - ReadAncillaryDataCallback, which enables getting ancillary data when receive a message using recvmsg API.

Reviewed By: cgrushko

Differential Revision: D24246707

fbshipit-source-id: 3363b5fafe8d370cf5560afe00476fc8ea723e7a

Summary: Also re-order the test slightly to catch this.

Reviewed By: yfeldblum

Differential Revision: D25704580

fbshipit-source-id: 1421daed11a0d41e1b99d573b38fc8fc70381486

Summary: All changes were automated

Reviewed By: Orvid

Differential Revision: D25507505

fbshipit-source-id: 4a1ae7578876975e20fd8eba194b9f8ed43d3530

Summary: All changes were automated

Reviewed By: Orvid

Differential Revision: D25507540

fbshipit-source-id: 71279e19ddad29622c14729d73f5d0d45f0ba410

Summary: All changes were automated

Reviewed By: Orvid

Differential Revision: D25507581

fbshipit-source-id: 5c936f1f81c5c754d3b64fb17b7dab253a178a39

Summary:
Fix gso typo

(Note: this ignores all push blocking failures!)

Reviewed By: kevin-vigor

Differential Revision: D25699054

fbshipit-source-id: bac1a7a5c13efa5a58ecec11edf72c500b0783b5

Summary: [folly] Add `co_cancelled`, effectively a shorthand for `co_error(OperationCancelled{})`.

Reviewed By: Mizuchi, lewissbaker

Differential Revision: D25627993

fbshipit-source-id: 91f80772a8b179a4de0fe3b29dfe7eecaafb8e1b

Summary: Fix nullptr dereference

Reviewed By: kevin-vigor

Differential Revision: D25687105

fbshipit-source-id: 59b0f3e4adc810f6e1a89447667cd167c52f7fb5

Differential Revision: D25683616

fbshipit-source-id: 7f199b0e43e0a5a76c4cf16412b22abdc28833ac

Summary: Fix `Arena` bytes-used accounting across calls to member `merge`.

Reviewed By: luciang

Differential Revision: D25656949

fbshipit-source-id: b230b0cdbf51b146fd566cbf688f49817bdf874d

Summary: [folly] Rename coro `Error.h` to `Result.h` since it has multiple result types.

Reviewed By: Mizuchi

Differential Revision: D25625178

fbshipit-source-id: 45f8194922b764429969329563a4695b1c13da6f

Summary: Fix `Arena` bytes-used accounting across calls to member `clear` after a sequence of all-large allocations.

Reviewed By: luciang

Differential Revision: D25656875

fbshipit-source-id: e79aca5f58b61bf1bd4790f8badd0dad6063a6ed

Summary: folly::Singleton is used for singletons that manage resources (thread, fds etc.) and it's generally not safe to use previously created folly::Singletons in child process after fork.

Reviewed By: yfeldblum

Differential Revision: D25292667

fbshipit-source-id: 5343d26c72bb9203429a918a3bb5d458c44e9f3b

Summary:
Recently I found that its impossible to access elevated Watchman daemon from non-elevated process on Windows.

```
events.js:174
      throw er; // Unhandled 'error' event
      ^
Error: connect EPERM \\.\pipe\watchman
    at PipeConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
Emitted 'error' event at:
    at Socket.<anonymous> (C:\open\ovrsource\unity\socialvr\_js\node_modules\fb-watchman\index.js:118:12)
    at Socket.emit (events.js:198:13)
    at emitErrorNT (internal/streams/destroy.js:91:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)
```

To fix this, it was suggested by wez to use [his library](https://github.com/wez/EleDo) to force Watchman daemon always start in normal mode on Windows. In this stack of commits I did integrated his library into project and used it to force daemon restart in normal mode when spawned from elevated terminal.

To make it happen, I checked-in library sources and created proxy project which depends on the initial library and contains header bindings and cmake configuration. I did copy pasted Rust cmake macroses from another facebook project - eden, and also created analogue of autogen.sh but for Windows - autogen.cmd.

Pull Request resolved: https://github.com/facebook/watchman/pull/878

Test Plan:
Launch elevated terminal
Start watchman.exe produced from sources
Observe daemon starting and answering
In process monitor, observe watchman.exe process running under user group

Reviewed By: fanzeyi

Differential Revision: D25595879

Pulled By: arhelmus

fbshipit-source-id: 15eb29adcf5bd4a5708b6533a1b2bacbf13f431c

Summary: [Folly] Cut `FOLLY_HAVE_MEMRCHR` since it is now unused.

Reviewed By: Orvid

Differential Revision: D22130149

fbshipit-source-id: b10c5a52354f5c549d96b54e0c165f08b96612b1

Summary: Since this API is discouraged from use, users should call `folly::observer_detail::ObserverManager::waitForAllUpdates` (and face whatever consequences may come with it).

Reviewed By: yfeldblum

Differential Revision: D25629064

fbshipit-source-id: 141b27bbc4f7cf9b628f15f837c38dd4d8a04f31

Reviewed By: zertosh

Differential Revision: D25662961

fbshipit-source-id: f5811a5797fd6dc8733fdf86f35c93d12a08d53a

Summary: Fix `Arena` total-size accounting across calls to `clear`, as reported by member `totalSize`.

Reviewed By: luciang

Differential Revision: D25656867

fbshipit-source-id: b5c7bb0e95199a9fa2c94c04de65b8f494eef146

Summary: Don't use gtest/gtest.h directly.

Reviewed By: yfeldblum

Differential Revision: D25659806

fbshipit-source-id: a8dd0da814465a787ab7904bdd0256f22b6e3ed8

Summary: As per title

Reviewed By: yfeldblum

Differential Revision: D25636982

fbshipit-source-id: a59c2325558175e122941000ab645c8735a3a425

Summary: Use `throw_exception` consistently in `Arena` for consistency.

Differential Revision: D25637401

fbshipit-source-id: 92cda5acc09b871fed78044fa3f3fa2c41b01609

Summary: [folly] `asan_region_is_poisoned` to wrap Address Sanitizer's `__asan_region_is_poisoned`.

Reviewed By: ot, luciang, markisaa

Differential Revision: D25651040

fbshipit-source-id: 0c8f1d0203ada43746b5e2e71c1bd8b883248f68

Summary: All changes were automated

Reviewed By: Orvid

Differential Revision: D25507555

fbshipit-source-id: c0be9a04b8a5f502f4753ce6e163a78c428bfad6

Summary:
Fix QUIC OSS build

(Note: this ignores all push blocking failures!)

Reviewed By: danobi

Differential Revision: D25645282

fbshipit-source-id: fcb71d4e930d7ac3802f31d71599338fb346eb80

Summary: Required for Windows with the more strict include order via upcoming formatting diffs.

Reviewed By: yfeldblum

Differential Revision: D25636437

fbshipit-source-id: 0a5fd400f63220400f89affb11b66e9692e9b352

Summary: Because folly can't depend on common.

Reviewed By: yfeldblum

Differential Revision: D25636772

fbshipit-source-id: d7b049330c9ca68eb4013fde5ca6de9413433823

Summary: Allow scheduling a "poison" task to indicate shutdown

Reviewed By: andriigrynenko

Differential Revision: D25609015

fbshipit-source-id: 8a42b99b402d78db7cfa3bd194730bb6948567c6

Summary: Currently doesn't do anything since TLS 1.3 is not yet enabled by default. Once it is, calling disableTLS13() on a context will set the max TLS version to TLS 1.2.

Reviewed By: mingtaoy

Differential Revision: D25642589

fbshipit-source-id: 0e580916b929111ed9721ca142b59eab0ea187df

Summary: Allows use with std::optional when available

Reviewed By: WillerZ

Differential Revision: D25618828

fbshipit-source-id: 3e039406ff1e885fd1767148b907635b23f7a88b

Summary: Use comparison expectations like `EXPECT_GE` in `Arena` test as v.s. `EXPECT_TRUE` with the comparison inside.

Reviewed By: markisaa

Differential Revision: D25631097

fbshipit-source-id: 4fb430f34d7683e3b82dd3fbb4408360f8990353

Summary: All changes were automated

Reviewed By: Orvid

Differential Revision: D25507575

fbshipit-source-id: cbddef5a79008d9bf8b6e0234e6433084e5d8df9

Summary: These are the only files out of hundreds in folly that have them, so just remove them entirely.

Reviewed By: yfeldblum

Differential Revision: D25612198

fbshipit-source-id: 88d4f5c2ffa08d45d0a901c9ef874cddc2730291

Summary: Eliminate noisy log message and provide the intended deadlock clue in a function name.

Reviewed By: yfeldblum

Differential Revision: D25627130

fbshipit-source-id: 8d92007d4fa7eff1efb5857f7f49bebde2d59b70

Summary: Specifically, ending in Test, singular, and reflecting the file being tested in full.

Reviewed By: yfeldblum

Differential Revision: D25612187

fbshipit-source-id: 514477e08b9e231d8574cae19640717b689b7d56

Differential Revision:
D25549986 (https://github.com/facebook/folly/commit/9a83e4242a933f91c9339b4c6d223267a43a89c1)

Original commit changeset: fd323e2e8cbf

fbshipit-source-id: af2bdb9f66d23d144f7e2e96118727d8b158f83f