Summary: The check was originally added to track down cpu pinning issue. In reality the check did get triggered, so change to soft error to calm the crazy nag bot. what's wrong with you.
We need to see the soft error log to find out what the error is.

Reviewed By: mzlee

Differential Revision: D2632752

fb-gh-sync-id: 87c11b186f97f0eb4a6c5ac13a1117b280198673

Summary: Without this tag type, it's impossible to use `Synchronized` with types like:

```
struct A {
  A(int, const char*);
  A(const A&) = delete;
  A& operator=(const A&) = delete;
  A(A&&) = delete;
  A& operator=(A&&) = delete;
};
```

In-place construction solves this problem. Usage:

```
Synchronized a(construct_in_place, 5, "c");
```

Reviewed By: nbronson

Differential Revision: D2610071

fb-gh-sync-id: 251fe8f8f6a2d7484dda64cf04dcacb998145230

Summary: This is the solution for our `HHWheelTimer` crashes, as suggested in D2617966#25.

djwatson also mentioned that maybe there should be some logging in the destructor if there are outstanding callbacks. I couldn't think of anything that would add to the `assert` that already exists in `destroy`. I'm open to suggestions though.

Reviewed By: djwatson

Differential Revision: D2628154

fb-gh-sync-id: f3db6e9384517c9bf3cbb60af8c1e711703a07fa

Summary: Define `__CLANG_PREREQ` macro to check version of clang.

Reviewed By: yfeldblum

Differential Revision: D2630325

fb-gh-sync-id: 3d666e554e8ddfc2c1fecd439aaf93f015829025

Summary: Callbacks sometimes outlive the `HHWheelTimer` that they reference. Then the `Callback` tries to reference the dead `HHWheelTimer` and it could either misbehave or crash. This was caught reliably by ASAN tests.

Since `HHWheelTimer` already supports intrusive ref counting, the solution is to acquire a reference within the `Callback`.

Reviewed By: djwatson

Differential Revision: D2617966

fb-gh-sync-id: 02be9ffc5851c269d5933288a17ad394b33ac2dd

Summary: Do not cancel TimeoutHandler timeout if the timeout has already run.

Reviewed By: spalamarchuk

Differential Revision: D2622280

fb-gh-sync-id: 27d83b44ab225e2859695f4e5f21cef934824a35

Summary: This name's meaning is very obscure, this method actually sets the
queue size of each acceptor and if all acceptor's queues are full the
connection will be dropped. Change it to a more meaningful name.

Reviewed By: alandau

Differential Revision: D2613681

fb-gh-sync-id: baa374cdf0a87c460df3dd5687e3d755b55f4b4f

Summary: Start server timeout after socket write succeeds in mcrouter.  Add neceessary Fibers logic to enable this behavior.

Reviewed By: pavlo-fb

Differential Revision: D2613344

fb-gh-sync-id: 1bc0fbe8b325a3e91cd010f89104b83ebf183679

Summary: If SharedPromise::getFuture() is invoked after a call to setInterruptHandler,
then the interrupt handler isn't set on the newly created promise. This diff
fixes that.

Reviewed By: yfeldblum

Differential Revision: D2610289

fb-gh-sync-id: bf8fce9e881b83ccac17d13c6788ec2afd0b0153

Summary: Allows AsyncTransportWrapper's to supply the underlying application
protocol being used, for example using NPN for SSL or some other
generic protocol indication mechanism.

Reviewed By: ranjeeth

Differential Revision: D2614179

fb-gh-sync-id: 2079782bb7d44f898fb14c7df15077209b022424

Summary: Our use case need to have the IndexType Configurable, but in this diff D2583752, lint error shows
  Code from folly::detail is logically private, please avoid use outside of folly.
In order to fix this lint error, I switch the IndexType and Allocator in the AtomicUnorderedInsertMap template.

Reviewed By: nbronson

Differential Revision: D2610921

fb-gh-sync-id: ae81b41e7c8c971f26c61b8c67dabeadff379584

Summary: Allow underlying transport to be accessible from AsyncTransportWrapper.
There are some code paths where we need access to the real transport from
the AsyncTransportWrapper. This allows us to retrieve the underlying transport
and have clients like HTTPSession use it.

Reviewed By: afrind

Differential Revision: D2609200

fb-gh-sync-id: 2b317d1825a005bb64468f83c64bc3f1c9bdfe2c

Summary: .. by including what you use.

These are a handful of headers that are depended on via viral inclusion. Include them directly.

Reviewed By: yfeldblum

Differential Revision: D2601172

fb-gh-sync-id: 215e87263325d085fbcb651f83f429f47d14fc1b

Summary: Prefer `std::move` to `move` for clarity's sake.

Reviewed By: yfeldblum

Differential Revision: D2601138

fb-gh-sync-id: 64a9e58a83da9c8416a0be5c45a292c6b1342664

Summary: This disallows implicitly constructing a StringPiece from a literal nullptr at compile time
(without this change, nullptr would cause a segfault in strlen()).

Reviewed By: meyering, andriigrynenko

Differential Revision: D2603597

fb-gh-sync-id: cafbc45945bacc72a7c89310b99aa62d19a3ff9f

Summary: Fix warnings triggered by `-Wcomment`.

Reviewed By: ajtulloch

Differential Revision: D2603992

fb-gh-sync-id: aae721f7c236d7d8b8bff2c077a481fc2affcf71

Summary: New API - write an entry and advance a cursor to the just-written slot.

Reviewed By: ritzau, yfeldblum

Differential Revision: D2599388

fb-gh-sync-id: f3ebfae97de0341f01ffc80ab10221313d02087c

Summary: Reclaim unnecessary fibers from the free pool periodically.  Turn this behavior
on in mcrouter/proxy.cpp

Reviewed By: pavlo-fb

Differential Revision: D2584825

fb-gh-sync-id: eabc58eefe6fd38972c9e23ca3cbe79eb8316a3e

Summary: Convert helper classes to using statements now that GCC has caught up
with c++11.

Reviewed By: simpkins

Differential Revision: D2561364

fb-gh-sync-id: 712591549aba9450d159468dc3b26a987ffe9b82

Summary: try_get() API is confusing right now, because it returns nullptr in release, but crashes in debug build. Users end up handling nullptr returns, yet their code crashes in debug builds for no reason. See https://www.facebook.com/groups/fbthrift/permalink/1222120054481561/ for an example.

If we want to keep the crashing API we should probably name it differently and make it crash both in debug and release.

Reviewed By: dhruvbird

Differential Revision: D2587818

fb-gh-sync-id: 5834bfa08eb5d9bc6db1c5edf4a048a5b1d3212c

Summary: In my use case, 1.5 billion keys with loadFactor 0.8, the linear probing performs really bad.

Reviewed By: nbronson

Differential Revision: D2579243

fb-gh-sync-id: 5081356de55f770823a4afad55bf7e2114b4e313

Summary: startWork_ is used only if enableTimeMeasurement is set. It gives ~0.5% performance win for mcrouter.

Reviewed By: yfeldblum

Differential Revision: D2590176

fb-gh-sync-id: 07f2189ebdec751cd0d91d191d8f595780d2808a

Summary: SYNCHRONIZED warns with -Wshadow due to `for (auto&
FB_ARG_1(__VA_ARGS__) =`. This diff just suppresses that warning.

Reviewed By: djwatson

Differential Revision: D2587348

fb-gh-sync-id: 3a2e39fb6ce28da014950ca94e4b62ea80deb65f

Summary: The implicit conversion loses integer precision: 'size_type' (aka 'unsigned
long') to 'int'.

Reviewed By: mzlee

Differential Revision: D2585883

fb-gh-sync-id: 1fc7c84b66c8f19cc36b798dd198730764e19b28

Summary: Further race is presented in HHWheelTimer and EventBase, since changing them to track callback life cycle is more involving, I am hacking around it to prove the concept. With the *fix*, no reproduce of the segmentation fault anymore.

This is for proving the concept, code will be cleaned up if we agree this is reasonable direction to pursue.

Reviewed By: fugalh

Differential Revision: D2577715

fb-gh-sync-id: e0bb0317268e6f02a54fc70454e63959fba70c10

Summary: Expose pending messages in accept queue in AsyncServerSocket.

Set default accept message queue size to 1024.

Reviewed By: djwatson

Differential Revision: D2525161

fb-gh-sync-id: a69ea0ee77729e4a8300bde3e3c07840f2d5d3cb

Reviewed By: yangliu

Differential Revision: D2578043

fb-gh-sync-id: cec8f21219655a495b99d0b6b99f0925615bc068

Summary: This is pretty much the reverse operation from the fromBinary() constructor.

Reviewed By: yfeldblum

Differential Revision: D2578680

fb-gh-sync-id: d8c4e53fe8bc0f5373ebb0b4f7ee498659c1b003

Summary: [Folly] Style nits for `folly/test/FingerprintBenchmark.cpp`.

Reviewed By: Gownta

Differential Revision: D2579463

fb-gh-sync-id: 135bc3ef43708cb024f78c59672811159d2163e0

Summary: Renaming `EnqueuedForAccept` and `DequeuedByAccept` to
`EnqueuedForAcceptor` and `DequeuedByAcceptor` respectively to make it clear
that the connection is queued for the Acceptor not to call `accept` on.

Reviewed By: yfeldblum

Differential Revision: D2554578

fb-gh-sync-id: 072a9ff122658827d1e89f2bef79ad565dad7974

Summary: Tested over weekend with D2571554. There was no EXC_RESOURCE/CPU crash when read errrors were returned on ENOTCONN. EAGAIN seems innocent as the spin detector was disabled on testing group.

Patch folly. I can add #ifdef __APPLE__ around the errno checking code but this should be good practice for non apple code as well.

I will remove debugging code in fbios master in another diff.

Reviewed By: djwatson

Differential Revision: D2580819

fb-gh-sync-id: 9162a3deba01af8b07cd2b336d7da3da040c67a9

Summary: AtomicUnorderedInsertMap's constructor takes a maxLoadFactor argument,
which is given its default argument of 0.8f in all of our code.
The clipping function that was supposed to prevent load factors
greater than one was inverted, resulting in all of our code using a
maxLoadFactor of 1 instead of 0.8.  This diff fixes the computation,
as well as changing all of the use sites so that the actual memory
allocated by existing clients does not change.

Reviewed By: yfeldblum

Differential Revision: D2575238

fb-gh-sync-id: bb9dd8de53114236b259631d175d62af098391cf

Summary: Add a couple benchmarks measuring allocation/deallocation latency.  One benchmark measures an allocate-deallocate repeated pattern, the other measures the allocation of a large chunk of fibers.

We'll use these benchmarks later on after we modify the allocation/deallocation behavior of fibers.

Reviewed By: pavlo-fb

Differential Revision: D2573064

fb-gh-sync-id: 414eb93d6223e42c187c03214a47dfb533491bab

Summary: Some libraries like Haskell's `Data.Aeson` can produce arbitrarily
big numbers with arbitrary precision.
The json standard doesn't specify the ranges for numeric types.
For interoperability, we should allow the user to parse the numbers with
some loss of precision.

Reviewed By: luciang

Differential Revision: D2565140

fb-gh-sync-id: b1a9a46e298bf13cc89d7e79ce28705e9e251a7f

Summary: AtomicUnorderedInsertMap used 32 bit index values internally.  2 bits
were stolen, limiting the capacity to 2^30.  This diff makes the internal
index type a template parameter, so you can make really big maps if you
want (at the expense of bigger map overhead).  The easiest way is to
substitute AtomicUnorderedInsertMap64.

Reviewed By: yfeldblum

Differential Revision: D2574338

fb-gh-sync-id: a74994b6da1046a149c2e7763c3dc19e35d9840b

Summary: readTerminatedString could infinite loop if the terminator does not appear in the contained IOBuf chain and maxLength > chain.computeChainLength.  I'm throwing out_of_range here because that more closely mirrors what the other read() functions do.

Reviewed By: siyengar

Differential Revision: D2571039

fb-gh-sync-id: 1db22089562d8767920d66a0a1b091b02de6571f

Summary: Clang's `strlen` is not `constexpr`, but `__builtin_strlen` is, so we can have an unconditional `constexpr` `StringPiece` constructor.

Reviewed By: luciang, yfeldblum

Differential Revision: D2561782

fb-gh-sync-id: 51e76a0d50355cc5ead1148ba2389b640a6888de

Summary: Tested in debian stretch when used in hhvm which can now run drupal 7.
The compilation error is also fixed by #214 but this fix maintains
 forward declarations of basic_string and list.
Closes https://github.com/facebook/folly/pull/329

Reviewed By: yfeldblum

Differential Revision: D2533880

fb-gh-sync-id: 85e18eeeba9efa1b4150217ba526b32b5573e15e

Summary: A few fields were swapped, and we had unintentionall fallthrough in
switch.

Reviewed By: luciang

Differential Revision: D2565884

fb-gh-sync-id: 8ad71c090c5120e99c672f785aaefdef03469ee2

Summary: FingerprintBenchmark was in an internal directory before, but it belongs alongside the Fingerprint code.

Reviewed By: yfeldblum

Differential Revision: D2534646

fb-gh-sync-id: d8ded3a5a9d33f60e9674ea71dc87a2d8d19a51b