Summary:
Add support for SQ poll groups - this allows sharing of the same SQ kernel poll thread

(Note: this ignores all push blocking failures!)

Reviewed By: kevin-vigor

Differential Revision: D23769744

fbshipit-source-id: c5fd3d22fd1048321896d7445d7bc7e2863ad533

Summary: Skip deadlocking fork tests in TSAN mode

Differential Revision: D23933183

fbshipit-source-id: a5fe2da954676f6ced2f00dea280e10ac88d99cd

Summary: Add support for immediate SQ poll submit

Reviewed By: kevin-vigor

Differential Revision: D23818098

fbshipit-source-id: d8d626c51aef0cf8c0049e081d86313cb731429a

Summary:
The symbolizer takes mapped addresses (address listed in ELF, offset by the binary offset (which is zero for non-PIE)) and symbolizes it into non-mapped addresses. In a couple of places in SymbolizerTest, we took the non-mapped addresses and symbolized them again, which wouldn't work if the binary was compiled with PIE. In another place in SymbolizerTest, the mapped address was used to look up DWARF information, whereas we needed the non-mapped address. This diff addresses these issues.

Additionally, I discovered that r_debug::r_map->l_addr is the "right" way to get the PIE offset, so this diff pulls that common functionality to symbolizer/detail/Debug.h and use it for Symbolizer and the three tests so far that need PIE relocation adjustments.

Reviewed By: yfeldblum

Differential Revision: D23492850

fbshipit-source-id: 62353e576c50b44070b323b5477fea9bb4c0b500

Summary: Similar to D23139413, this is another place where openssl causes TSAN issues widely in fbcode.

Reviewed By: yfeldblum

Differential Revision: D23698225

fbshipit-source-id: e883784500392c2d5be757c37cceb8bf8cc8b2aa

Summary: I don't recall what previous intermediate state justified guarding use of backtrace with __APPLE__ and FOLLY_USE_SYMBOLIZER, but it no longer applies.

Reviewed By: yfeldblum, luciang

Differential Revision: D23881192

fbshipit-source-id: b3ca829f9c738f50f7ab7e038348ec3df65ae4b9

Summary: Original commit changeset: 6362acb7a668 (D23066827 (https://github.com/facebook/folly/commit/0b3d9d21b7d1496e0b592ee6ce7a687c86c0498f))

Reviewed By: yfeldblum

Differential Revision: D23837145

fbshipit-source-id: 642c1401aea0b01c0c5e53c24b100f5daa600512

Summary: [Folly] Fix the Apple LLVM version when disabling is-constexpr-default-constructible test expectations over types with non-trivial destructors for Xcode 12.

Differential Revision: D23917973

fbshipit-source-id: 1238ec5a53ba0ff73afd67f81ad2868f37196eaa

Reviewed By: yfeldblum

Differential Revision: D23847355

fbshipit-source-id: b5fbf5bea515111d34962100af0f44ae11e0845f

Summary:
- Changed namespace from facebook::memory to folly
- Changed include paths
- Left a stub file in common/memory/not_null.h

Differential Revision: D23740776

fbshipit-source-id: 6eff6823017e3a5d20a540fde10b99aa0381d4b0

Summary: [Folly] Internally rename `await` in `folly/fibers/` since some versions of MSVC effectively `#define await co_await` breaking the build - except it's not really a `#define` and there is no reliable way to detect it.

Reviewed By: Orvid

Differential Revision: D23882811

fbshipit-source-id: 836bebcbcfe01ce39c873202b67796efafa1c366

Summary:
folly::Function is non-copyable. This means it can be used with lambdas that capture
a unique_ptr, whereas std::function can not.

See https://www.internalfb.com/intern/wiki/Folly/Function/

Differential Revision: D23883275

fbshipit-source-id: a26cda0d3833e3ea822beef99c6a28a6dd90fa83

Summary:
Fixes a few documentation errors that get surfaced when compiling with the -Wdocumentation flag.
Full explanation of errors with examples here:
https://clang.llvm.org/docs/DiagnosticsReference.html#wdocumentation

Reviewed By: yfeldblum

Differential Revision: D23872718

fbshipit-source-id: 0bb803c6e9412e72985c17415b424be08b51a693

Summary: [Folly] Rename private `find` member in `sorted_vector_set`, `sorted_vector_map` to avoid confusing conflicts with derived-class `using` statements when the derived class privately inherits the base.

Reviewed By: ha1dfo

Differential Revision: D23863338

fbshipit-source-id: 43e67da9683fb4c0af3fa1c86ade7735935e5e0c

Summary:
[Folly] Suppress is-constexpr-default-constructible test for types with non-trivial user-provided (until C++20) or non-constexpr (since C++20) destructors under Clang 10.

Responsible llvm commit: https://github.com/llvm/llvm-project/commit/457226e02a6e.

Related llvm bug report: https://bugs.llvm.org/show_bug.cgi?id=47620. This bug report documents a crash in the compiler, but fails to document deviation from the language spec.

Reviewed By: Mizuchi

Differential Revision: D23862920

fbshipit-source-id: 855db4773ffc062ad9d361feac3709922db7b42d

Summary: This shows up when compiling with mode/win.

Reviewed By: yfeldblum

Differential Revision: D23871729

fbshipit-source-id: 1d52f41f425cd542bae1ac2c3bfe9893fffefdf4

Summary:
Change WARNING to INFO because there are cases where not using a dedicated thread pool is the right choice. INFO still provides the debugging benefit if the lack of dedicated thread pool indeed leads to deadlock.

Clarify that the likely cause for the message about the reclamation executor is that the program did not call folly::enable_hazptr_thread_pool_executor which is called by folly::init.

Reviewed By: yfeldblum, joshkehn

Differential Revision: D23826463

fbshipit-source-id: a5906ee974b5fe87c2d38dcff9a0f2717afb2a5c

Summary: Fix document typo for `folly::IsOneOf` (see diff)

Reviewed By: yfeldblum

Differential Revision: D23863254

fbshipit-source-id: 02f64a72decab028be832f71e1132dfce7fe5fa9

Summary:
Now that symbolizer has precise feature flags, enable
FOLLY_USE_SYMBOLIZER on any platform that has backtrace(3), which is
all that's needed to get a useful stack trace printed in the signal
handler.

Reviewed By: yfeldblum, luciang

Differential Revision: D23361609

fbshipit-source-id: b124f7fd01e94f90d8f8586555a64bd6e412040c

Summary: Allow changing the Sleeper sleep interval

Reviewed By: yfeldblum

Differential Revision: D23591682

fbshipit-source-id: 81b55fa699362d62e436c599c38046d15fecee37

Summary:
To have parity with C++20 `std::erase_if`: https://en.cppreference.com/w/cpp/container/unordered_set/erase_if

Added a return value for `folly::erase_if` for the number of the removed elements.

(Note: this ignores all push blocking failures!)

Reviewed By: yfeldblum

Differential Revision: D23779631

fbshipit-source-id: cea42b90557dd570db8e010d68c2b9ecf0bcc515

Summary: Fix 1-byte buffer overrun when parsing the string "\t".

Reviewed By: mhlakhani

Differential Revision: D22931605

fbshipit-source-id: a90d0a64b882ed8fef96285d47e11fa082178449

Summary:
Move ContextPrimaryPtr definition outside of the function.
Rename MasterPtr to PrimaryPtr.

Reviewed By: Orvid

Differential Revision: D23836006

fbshipit-source-id: d2ad229809fb260c485a7349eca7378e22dc66c4

Differential Revision: D23829791

fbshipit-source-id: 4a13cd70f20de487ece11a1eada94467e1700b6e

Summary:
To be able to override this feature, we should check that
`FOLLY_USE_JEMALLOC` is set to 1 rather than just set.

Reviewed By: yfeldblum

Differential Revision: D22681072

fbshipit-source-id: 18b35910217fd1869cc23107a50241c4ed2ed1b7

Summary: FOLLY_USE_SYMBOLIZER is too coarse of a flag to determine whether ExceptionTracer is available. Instead, use FOLLY_HAVE_ELF and FOLLY_HAVE_DWARF.

Reviewed By: yfeldblum, luciang

Differential Revision: D23361407

fbshipit-source-id: 2326f185c98f58e7afb007befc9121a365c22e77

Summary: [Folly] Revise SFINAE in `Padded`.

Reviewed By: iahs

Differential Revision: D23799751

fbshipit-source-id: 1bf08c5f61f14e95c33077dd690a550fb49fe776

Summary:
Pull Request resolved: https://github.com/facebook/folly/pull/1447

The operation is performed with StringPiece, and avoids temporary strings.

Reviewed By: yfeldblum

Differential Revision: D23479603

fbshipit-source-id: 4718fa062b1eb1910b96f3b0c3ae40af8c05f2e3

Reviewed By: ot

Differential Revision: D23802800

fbshipit-source-id: 993060123790058b44d13c0b38eb4a04a28462a2

Summary:
[Folly] Cut old memrchr port in global namespace since it is excessively difficult to make it portable across all platforms.

Fixes: https://github.com/facebook/folly/issues/817.
Fixes: https://github.com/facebook/folly/issues/1391.

Reviewed By: Orvid

Differential Revision: D22130039

fbshipit-source-id: 43511aa95c749d5f603ff8043c438ba63d44f6c1

Summary:
D23695665 (https://github.com/facebook/folly/commit/5c3b9d59a815b94df1afed0b7e0050bb75e09178) calls functions defined by this module,
but doesn't ensure that it has been imported.

I believe this to be the reason behind this build failure:

https://github.com/facebook/watchman/pull/856/checks?check_run_id=1135919864#step:52:217

Reviewed By: chadaustin

Differential Revision: D23794292

fbshipit-source-id: 897cfac862fda7420d1c53b0976492231b53dcf8

Summary: Refine some guards to be more precise.

Reviewed By: yfeldblum, luciang

Differential Revision: D23361317

fbshipit-source-id: 806d899890c990a840c4275fb1180e45a944715d

Summary:
Instead of assuming every posix-y system has ucontext.h, detect
swapcontext's existence at build time. Android NDK provides ucontext.h
but not its corresponding functions.

Reviewed By: yfeldblum

Differential Revision: D23695665

fbshipit-source-id: 9e49c6fbf553abff6249d55c780c09cc19d0bb48

eden/edenapi and mononoke integration tests: add edenapi/tools to getdeps and use them in tests (#51)

Summary:
Pull Request resolved: https://github.com/facebookexperimental/eden/pull/51

This diff extends capabilities of CargoBuilder in getdeps so that individual manifests can be build even without workspaces. Thanks to that a build for edenapi/tools can be made and its artifacts can be used in mononoke integration tests.

Reviewed By: StanislavGlebik

Differential Revision: D23574887

fbshipit-source-id: 8a974a6b5235d36a44fe082aad55cd380d84dd09

Summary:
Use folly::get_cached_pid(), a faster getpid() replacement, in NotificationQueue.

Outline CHECK_EQ from checkPid().

Reviewed By: yfeldblum

Differential Revision: D23433868

fbshipit-source-id: 66ef0e243d74aa176a496e1ae15aeae5e67e4f5c

Summary:
Constant from: http://eel.is/c++draft/cpp.predefined#1.1

Fixes https://github.com/facebook/folly/issues/1454

Pull Request resolved: https://github.com/facebook/folly/pull/1455

Reviewed By: yfeldblum

Differential Revision: D23702274

Pulled By: Orvid

fbshipit-source-id: a08f922cc11c086362b91c93922b59c9a5c62e51

Reviewed By: krallin

Differential Revision: D23757084

fbshipit-source-id: 7e49228805e272064ad52d43141b5815eba4190a

Summary:
[Folly] Always enable fiber support in futures.

(Note: this ignores all push blocking failures!)

Reviewed By: andriigrynenko

Differential Revision: D19229519

fbshipit-source-id: f0a034e9387c5ccad676a911213fab74364ca340

Summary:
Add the ability for an AsyncGenerator to yield an error without needing to throw an exception and for consumers to retrieve the error without rethrowing the exception.

Added a new `folly::coro::co_error` type that acts as a simple wrapper around a `folly::exception_wrapper` that can be used to indicate that this value is an error.

This allows `AsyncGenerator` bodies to now `co_yield` a `co_error` as a way of completing with an error without needing to throw the exception.

For example:
```
class SomeError : public std::exception { ... };
folly::coro::AsyncGenerator<int> example() {
  co_yield 42;
  co_yield folly::coro::co_error(SomeError{});
}
```

This diff also adds support for `folly::coro::co_awaitTry()` to the `AsyncGenerator::next()` method.

For example:
```
folly::coro::Task<void> consumer() {
  folly::coro::AsyncGenerator<int> gen = example();
  folly::Try<int> result =
    co_await folly::coro::co_awaitTry(gen.next());
  // use result
}
```

Added a benchmark to compare performance of the new interfaces vs the existing throwing-based error handling.

Reviewed By: yfeldblum

Differential Revision: D18015926

fbshipit-source-id: 27d2e16e7dde9b4c871846f5d17b40ec3737330a

Summary: getVia is destructive like other forms of get. This change r-value qualifies it to highlight that in code.

Reviewed By: yfeldblum

Differential Revision: D23603722

fbshipit-source-id: d2aecac3c6eb09e0fcf55a07e310114ebc13b932