Summary: make it std::atomic

Reviewed By: @tudor

Differential Revision: D2191861

Summary: [Folly] to_shared_ptr.

So you can write this:

    auto sptr = to_shared_ptr(getSomethingUnique<T>());

Instead of this:

    auto sptr = shared_ptr<T>(getSomethingUnique<T>());

Useful when `T` is long, such as `T = foobar::cpp2::FooBarServiceAsyncClient`.

Reviewed By: @meyering

Differential Revision: D2193572

Summary: this taks advantage of SSL_write_iovec and SSL_read_buf functions to improve CPU.  This eliminates one malloc+memcpy+free operation for all HTTPS traffic, and save up to two for small packets.

It saves 10~15% CPU
https://fburl.com/99681397
https://fburl.com/99427544

Reviewed By: @djwatson

Differential Revision: D1993764

Reviewed By: @ot

Differential Revision: D2188740

Summary: We have this now.

Reviewed By: @jsedgwick

Differential Revision: D2191642

Summary: Storing the new state could be a memory race according to C++ (but wasn't in practice). I only checked GCC though.

Reviewed By: @nbronson

Differential Revision: D2189287

Summary: Not 100% about the `ThreadWheelTimekeeper` test. It makes TSAN happy
though.

Reviewed By: @yfeldblum

Differential Revision: D2187901

Summary: 1) We forgot to `--attached_` if `x` throws an exception
2) `PriorityExecutor` didn't execute `Func`, causing leaks in the test (not a bug in Futures)
3) I moved up the initialization for an empty `Core` into the constructor to make it easier to see

Reviewed By: @jsedgwick

Differential Revision: D2187343

Summary: This was set to 32 which probably works fine for the
majority of FB servers, but not everyone's system is so endowed.

Closes #119

Reviewed By: @fredemmott

Differential Revision: D2187008

Summary: See title.

Reviewed By: @fugalh

Differential Revision: D2186833

Summary: The existing tests were trying to find undocumented
symbols in glog/glags which aren't guaranteed to be there on all
platforms.

Use AC_RUN_IFELSE() to try building and executing some code
typical of the usage of these libraries.

Closes #117

Reviewed By: @JoelMarcey

Differential Revision: D2183526

Summary: In the case of the copy constructor, this change
doesn't really matter, since it's deleted anyway.

In the case of the move constructor, it fixes what was probably
an unintentional hiding.  The class certainly looks like
it supports moving.

Closes #121

Reviewed By: @yfeldblum

Differential Revision: D2184131

Summary: svformat explicitly takes a container for direct indexing,
but the format string used is per-arg, which corresponds to format/sformat.

Closes #228

Reviewed By: @JoelMarcey

Differential Revision: D2184334

Summary: Release builds should probably favor using
@marpaia's brew Formula to get a release build.

Leave the boostrap script around to simplify building
from master.

Closes #229

Reviewed By: @jwatzman

Differential Revision: D2184416

Summary: Not sure if this is really undefined behavior or whether UBSAN is just super paranoid. Will try to read up on it later.

I also changed some other `std::atomic` initialization to always follow the same pattern, let me know if I should revert those. I couldn't resist, OCD kicked in.

idonthaveocd

Reviewed By: @fugalh

Differential Revision: D2181074

Summary: Extend the MacOS s6_addr16 hack to Net/Open/FreeBSD

Closes #106

Reviewed By: @JoelMarcey

Differential Revision: D2182912

Summary: See the comment for details

Reviewed By: @nbronson

Differential Revision: D2181231

Summary: This way, handlers can carry out more complex manipulations of the pipeline via ctx->getPipeline() without knowing the R/W types

Reviewed By: @djwatson

Differential Revision: D2158736

Summary: Roughly described in https://github.com/facebook/hhvm/issues/5344.

Closes #206

Reviewed By: @yfeldblum

Differential Revision: D2170803

Pulled By: @sgolemon

Summary: It is fixed in gmock. No need to suppress it in sources.

Reviewed By: @meyering

Differential Revision: D2181564

Summary: [Folly] instance Eq Unit

    Unit::operator==(const Unit&)
    Unit::operator!=(const Unit&)

Reviewed By: @Gownta

Differential Revision: D2179384

Summary: Running clang-tidy to fix this problem, using script D2171334.

I noticed that even without this change clang dev build succeeds for folly and opened a separate task to investigate why.

Reviewed By: @markisaa

Differential Revision: D2179299

Summary: This is slightly more correct than assuming that
__APPLE__ is the only place this assumption breaks.

Pulled from relevant section of folly-PR#95, other sections
are either already applied by other fixes, or have been code-moved.

Closes #95

Reviewed By: @jwatzman

Differential Revision: D2178439

Summary: Tested on Mac OS X 10.10.3 and MacPorts 2.3.3.
Closes #227

Reviewed By: @yfeldblum

Differential Revision: D2176700

Pulled By: @sgolemon

new small_vector tests that fail on trunk and uncover a bug in emplace_back on references to memory inside the vector + a fix + perf improvement to const lvalue push_back

Summary: emplace_back() on a small_vector applied on data inside the vector doesn't work properly.
In standard vectors, this usage is required to work properly, but I'm not sure whether it should in small_vector. Consider fixing / adding a lint rule.

Reviewed By: @yfeldblum

Differential Revision: D2122931

Summary: Wrap asm("pause") in an inline so that it becomes
asm("wfe") on aarch64.

Closes #187
Closes #190

Reviewed By: @yfeldblum

Differential Revision: D2152868

Pulled By: @sgolemon

Summary: fixed then() exceptions propagation and added unit-test

Reviewed By: @fugalh

Differential Revision: D2159075

Summary: Moved abstraction layer for platform-specific bit-manipulation instructions from the EliasFanoCoding.h to Instructions.h since we will need to use it also for BitVectors:

Reviewed By: @ot

Differential Revision: D2165314

Summary: SharedMutex has been in heavy production use for a while with no
bugs reported and no API changes requested, it is no longer experimental.

Reviewed By: @yfeldblum

Differential Revision: D2165275

Summary: dynamic's integer type is signed, so make sure array indices
are not negative.

(See https://our.intern.facebook.com/intern/tasks/?t=7445055)

Reviewed By: @Gownta

Differential Revision: D2145689

Summary: Instead of the one-off Nothing struct

Reviewed By: @yfeldblum

Differential Revision: D2158621

Summary: Three strategies
1. Optimistic locking
2. Acquire-release memory ordering instead of full sequential consistency
3. Some low-hanging branch miss optimizations

Please review carefully; the dogscience is strong with this one

```
Before:

============================================================================
folly/futures/test/Benchmark.cpp                relative  time/iter  iters/s
============================================================================
constantFuture                                             127.99ns    7.81M
promiseAndFuture                                  94.89%   134.89ns    7.41M
withThen                                          28.40%   450.63ns    2.22M
----------------------------------------------------------------------------
oneThen                                                    446.68ns    2.24M
twoThens                                          58.35%   765.55ns    1.31M
fourThens                                         31.87%     1.40us  713.41K
hundredThens                                       1.61%    27.78us   35.99K
----------------------------------------------------------------------------
no_contention                                                4.63ms   216.00
contention                                        80.79%     5.73ms   174.52
----------------------------------------------------------------------------
throwAndCatch                                               10.91us   91.64K
throwAndCatchWrapped                             127.14%     8.58us  116.51K
throwWrappedAndCatch                             178.22%     6.12us  163.32K
throwWrappedAndCatchWrapped                      793.75%     1.37us  727.38K
----------------------------------------------------------------------------
throwAndCatchContended                                        1.35s  741.33m
throwAndCatchWrappedContended                    139.18%   969.23ms     1.03
throwWrappedAndCatchContended                    169.51%   795.76ms     1.26
throwWrappedAndCatchWrappedContended            17742.23%     7.60ms   131.53
----------------------------------------------------------------------------
complexUnit                                                127.50us    7.84K
complexBlob4                                     100.14%   127.32us    7.85K
complexBlob8                                     100.16%   127.30us    7.86K
complexBlob64                                     96.45%   132.19us    7.57K
complexBlob128                                    92.83%   137.35us    7.28K
complexBlob256                                    87.79%   145.23us    6.89K
complexBlob512                                    81.64%   156.18us    6.40K
complexBlob1024                                   72.54%   175.76us    5.69K
complexBlob2048                                   58.52%   217.89us    4.59K
complexBlob4096                                   32.54%   391.78us    2.55K
============================================================================

After:
============================================================================
folly/futures/test/Benchmark.cpp                relative  time/iter  iters/s
============================================================================
constantFuture                                              85.28ns   11.73M
promiseAndFuture                                  88.63%    96.22ns   10.39M
withThen                                          30.46%   279.99ns    3.57M
----------------------------------------------------------------------------
oneThen                                                    231.18ns    4.33M
twoThens                                          60.57%   381.70ns    2.62M
fourThens                                         33.52%   689.71ns    1.45M
hundredThens                                       1.49%    15.48us   64.58K
----------------------------------------------------------------------------
no_contention                                                3.84ms   260.19
contention                                        88.29%     4.35ms   229.73
----------------------------------------------------------------------------
throwAndCatch                                               10.63us   94.06K
throwAndCatchWrapped                             127.17%     8.36us  119.61K
throwWrappedAndCatch                             179.83%     5.91us  169.15K
throwWrappedAndCatchWrapped                     1014.48%     1.05us  954.19K
----------------------------------------------------------------------------
throwAndCatchContended                                        1.34s  749.03m
throwAndCatchWrappedContended                    140.66%   949.16ms     1.05
throwWrappedAndCatchContended                    164.87%   809.77ms     1.23
throwWrappedAndCatchWrappedContended            49406.39%     2.70ms   370.07
----------------------------------------------------------------------------
complexUnit                                                 86.83us   11.52K
complexBlob4                                      97.42%    89.12us   11.22K
complexBlob8                                      96.63%    89.85us   11.13K
complexBlob64                                     92.53%    93.84us   10.66K
complexBlob128                                    90.85%    95.57us   10.46K
complexBlob256                                    82.56%   105.17us    9.51K
complexBlob512                                    74.13%   117.12us    8.54K
complexBlob1024                                   63.67%   136.37us    7.33K
complexBlob2048                                   50.25%   172.79us    5.79K
complexBlob4096                                   26.63%   326.05us    3.07K
============================================================================
```

Reviewed By: @djwatson

Differential Revision: D2139822

Summary: Directly pass the arguments to respective constructors.
Instead of first making temporary and then pass that.

Closes #218

Reviewed By: @yfeldblum

Differential Revision: D2156978

Pulled By: @sgolemon

Summary: Fix leaks in unit tests

Reviewed By: @djwatson

Differential Revision: D2153681

Summary: It is often useful to retrieve the value preceding the current value
in an Elias-Fano iterator, for example when the list represents
adjacent ranges. This diff implements a new method `previousValue` in
`EliasFanoReader`.

It also adds a new `kUnchecked` boolean template argument to
`EliasFanoReader` which skips bounds checking.

Reviewed By: @philippv

Differential Revision: D2155049

Summary: add remove<T>, remove(Handler*), removeFront(), removeBack() to Pipeline
employ these to fix up reusing client pipelines with client dispatchers, which in turn fixes the broken ServiceTest

Reviewed By: @djwatson

Differential Revision: D2152636

Summary: AtomicUnorderedInsertMap is a concurrent hash table that firmly
at the performance end of the generality <-> performance spectrum.
If you don't need updates (or can use your own concurrency control when
overwriting values), you never need to delete, and you can predict your
capacity perfectly, then you will get wait-free reads, lock-free inserts,
safe concurrent iteration, and excellent cache and performance outlier
behavior.  Arbitrary key and value types are supported.

Reviewed By: @yfeldblum

Differential Revision: D2145281

Summary: the openssl improvement does not support compression and decompression.

Reviewed By: @Invalid auth token., @afrind

Differential Revision: D2151003