Programming Languages Research Group: Git

moar CRTP to minimize copypasta for inbound/outbound handlers

Summary:
I think this is the best I can do to minimize whjat must be copied for InboundHandler, InboundHandlerContext, InboundContextImpl, outbound equivalents, etc

Test Plan: unit

Reviewed By: davejwatson@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2025612

Tasks: 6836580

Signature: t1:2025612:1430346200:bc06162711bbc52b17574297a3569736f7973a7c

struct/class consistency

Summary:
This diff is based on https://github.com/facebook/folly/pull/95
by gitbug user mikekap.

It changes the struct/class naming of forward declarations to match
their definitions.

Test Plan:
fbconfig -r folly && fbmake runtests

Reviewed By: markisaa@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2032995

Tasks: 6783581

Signature: t1:2032995:1430339337:79193fd8409b73e8a9155133f326b7cee534244d

Bump version to 37:0

fix unittest break

Summary: It looks like the ubuntu version of gtest complains about this?

Test Plan:
Will watch jenkins fbthrift and proxygen builds

previous jenkins break:
https://ci-builds.fb.com/job/folly/2178/console

Reviewed By: bmatheny@fb.com

Subscribers: doug, folly-diffs@, yfeldblum, chalfant

FB internal diff: D2032761

Tasks: 6913742

Signature: t1:2032761:1430337624:ec65b26cf8da7d0d8c7e449f235de7147d4f17d6

Blame Revision: D2029802

Move Singleton out of folly/experimental into folly/

Test Plan: contbuild

Reviewed By: chip@fb.com

Subscribers: wormhole-diffs@, trunkagent, hphp-diffs@, jan, simpkins, configerator-diffs@, fbcode-common-diffs@, chaoyc, bill, search-fbcode-diffs@, agallagher, nli, marcelo, ckwalsh, mcduff, hitesh, mshneer, unicorn-diffs@, vighnesh, fugalh, andreib, bmatheny, tw-eng@, tanmoyc, zhuohuang, rvm4, antonl, acampi, alikhtarov, hdoshi, rsethi, panin, folly-diffs@, lins, kennyyu, hannesr, jsedgwick, dominik, yfeldblum, songhao, raghavpi, labrams, lyang, chalfant, #preselection, macsyz, nimishshah

FB internal diff: D2012267

Tasks: 5676394

Signature: t1:2012267:1430334667:eaad0262b35ffbfae86df5bdb45bf057ac62c51b

Shave off 1.3s of THeader.h compile time

Summary:
THeader.h went from 1.8s to 0.5s.
Total build of sample project doing thrift client and server stuff went
down 1.5-3% from

```
(run 1)
real    5m25.059s
user    130m30.853s
sys     10m18.642s

(run 2)
real    5m29.483s
user    129m12.209s
sys     10m14.762s
```

to
```
(run 1)
real    5m23.292s
user    125m44.318s
sys     10m7.103s

(run 2)
real    5m20.999s
user    127m4.969s
sys     10m10.118s
```

Test Plan:
fbmake --distcc off --ccache off dbg
Will also watch contbuild, since some files might be missing includes

Reviewed By: haijunz@fb.com

Subscribers: jmarg, anca, reachfrequency-eng@, jhunt, yanli, jgeller, chaoyc, search-fbcode-diffs@, net-systems@, zeus-diffs@, vikas, jcoens, unicorn-diffs@, ldbrandy, jteller, atlas2-eng@, everstore-dev@, leis, benj, laser-diffs@, zhguo, jying, wanghuan, jeremyfein, dbolcioni, jacekm, maxwellsayles, osmith, pallotron, fbcode-common-diffs@, davejwatson, andrewcox, marcelo, ckwalsh, mcduff, hitesh, mshneer, fugalh, alandau, bmatheny, folly-diffs@, jsedgwick, yfeldblum, haijunz, chalfant

FB internal diff: D2029911

Signature: t1:2029911:1430261056:9ae688c50585a6454479f810d80b2c1c79b60e04

Move this `reduce` to `helpers.h`

Summary: just a lowly non-erroring semantic merge conflict

Test Plan: builds

Reviewed By: jsedgwick@fb.com

Subscribers: trunkagent, exa, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2029593

Signature: t1:2029593:1430319785:2cd96927b9080fe18b168ab95ad201afc4f00857

get_or_throw and get_optional

Summary:
Adds get_or_throw map helper (get a value, or throw with the specified
exception type) and get_optional (get an Optional<Value>). This is a folly
backport of some util helpers in experimental.

Test Plan: Unit tests

Reviewed By: wez@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D2029802

Tasks: 4332480

Signature: t1:2029802:1430280249:3efbb2fb9394e31b3fbe6d5bd209d12ebb7ed587

An IOExecutor that executes under mapped fiber context.

Summary:
This should help executing sync thrift handlers on fibers. This allows the handler methods to achieve concurrency by awaiting.

Test Plan: Chimera unit tests (which also accesses running FacebookBase methods in fiber context!)

Reviewed By: davejwatson@fb.com

Subscribers: trunkagent, hannesr, andrii, folly-diffs@, jsedgwick, haijunz, yfeldblum, alandau, chalfant

FB internal diff: D2015886

Signature: t1:2015886:1430156870:a84499e0e781f5e6e77f48f1f3063f53d0968698

Dynmaic load shedding

Summary:
add a free system memory limit to Load Shed Configuration for dynamic shedding

Test Plan:
tested on edge241.01.ams3, works as expected. Once the free memory is less than 23G (picked on purpose for testing), new connections are shedded. But the shedding rate is totally wrong. I will explain and address it in another diff.

https://fburl.com/103620501
https://fburl.com/103620701

Reviewed By: afrind@fb.com

Subscribers: trunkagent, fugalh, bmatheny, nimishshah, folly-diffs@, jsedgwick, yfeldblum, chalfant, xning, alexkr

FB internal diff: D2026477

Tasks: 4604893

Signature: t1:2026477:1430176828:65eadd82efa3189a1bebcb8518efaf56cd36beed

Promise::setValue() for Unit

Summary: Unit is a bit special because it's just something special to use instead of `Promise<void>`, so let's offer the same sugar that `Promise<void>` has (`p.setValue()` instead of `p.setValue(Unit())`)

Test Plan: New unit tests. Look, a pun!

Reviewed By: jsedgwick@fb.com

Subscribers: exa, folly-diffs@, jsedgwick, yfeldblum, chalfant, davejwatson, hannesr

FB internal diff: D2014139

Tasks: 6847876

Signature: t1:2014139:1430159950:1484ee420c6d7f0f794a546b78ef1601c2eec45c

Fix default arguments for orderBy()

Summary: Calling `folly::gen::orderBy()` without arguments causes a compilation error because the first template argument cannot be deduced. This diff fixes it.

Test Plan:
fbconfig -r folly && fbmake runtests

Reviewed By: philipp@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D2025789

Signature: t1:2025789:1430167404:02fde7287b015d9dcbf398e8dc84cde7d74b4a5b

BenchmarkSuspender::dismissing.

Summary:
[Folly] BenchmarkSuspender::dismissing.

Pass a lambda to it, and the lambda will be executed while the benchmark-suspender is dismissed. Just a bit of sugar around `BenchmarkSuspender::dismiss` and `BenchmarkSuspender::rehire`.

BENCHMARK(name_void, iters) {
BenchmarkSuspender braces;
# benchmark timer is suspended
braces.dismissing([&] {
# benchmark timer is running
doSomething();
});
# benchmark timer is suspended
}

BENCHMARK(name_value, iters) {
BenchmarkSuspender braces;
# benchmark timer is suspended
auto value = braces.dismissing([&] {
# benchmark timer is running
return doSomething();
});
# benchmark timer is suspended
}

Test Plan:
Unit tests:
* `folly/test/BenchmarkTest.cpp` (actually a benchmark)

Reviewed By: njormrod@fb.com

Subscribers: net-systems@, folly-diffs@, yfeldblum, chalfant

FB internal diff: D2024166

Signature: t1:2024166:1430163281:24df0ac98cbe36372f780372ee8f7dd3722b7868

Handler::getContext() when possible

Summary:
Only allow this if the handler is only ever attached to a single pipeline once. i.e. only ever associated with one Context

Test Plan: unit, thrift unit

Reviewed By: davejwatson@fb.com

Subscribers: fugalh, alandau, bmatheny, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2024007

Tasks: 6836580

Signature: t1:2024007:1430157264:efcf70ca3531c10eec5d458c9e9d6cda60c507c3

fix detachPipeline/attachPipeline ordering

Summary:
detachPipeline always goes bottom to top
attachPipeline always goes top to bottom
now we can attachReadCallback in AsyncSocketHandler::attachPipeline()

not sure of the implications for TAsyncTransportHandler... looks like Cpp2Channel still wants to attach/detach cb manually

Test Plan: unit

Reviewed By: davejwatson@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2023982

Tasks: 6836580

Signature: t1:2023982:1430157500:e09a4103550a3e5721effaa1b28ac5bed071fa67

Bump version to 36:0

README: Fixed typo, formatted code, and linked to docs

Summary:
(from @njormrod) This changes the READMEs to be .md,
appropriate for github. I viewed the docs on github, and they looked
WAY better as .md files.

Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Test Plan: view on github

Reviewed By: markisaa@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1999531

Tasks: 6783581

Signature: t1:1999531:1429220432:68c6d8dc70806d993c83cacce6369cb7e6e964c8

Manage handlers with shared_ptrs, introduce StaticPipeline

Summary:
A few things:
- Eliminate HandlerPtr by managing all handlers with shared_ptrs instead of keeping them inline in the pipeline
- Kill recursively templated ChannelPipeline accordingly
- Introduce StaticPipeline to retain the flexibility of zero-alloc pipelines
- Introduce notion of an "owning handler" to avoid destruction order issues

Test Plan: unit (will add more), thrift unit

Reviewed By: davejwatson@fb.com

Subscribers: fugalh, alandau, bmatheny, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2023976

Tasks: 6836580

Signature: t1:2023976:1430159578:e50e8a149e549a40670d093fb65987a4843cdd8d

rearrange Future.h

Summary: Move boring preamble stuff to `Future-pre.h` and `folly::futures` and `makeFuture` and pals to `helpers.h`.

Test Plan:
tests still build and pass

Reviewed By: jsedgwick@fb.com

Subscribers: exa, folly-diffs@, jsedgwick, yfeldblum, chalfant, hannesr, davejwatson

FB internal diff: D2014330

Signature: t1:2014330:1429941589:1e2c336136f3375f9b96e5df8c06ca5820ba6aeb

strip Channel from all class names

Summary: as above. Only got a little messy when components within folly::wangle typedefed things to Pipeline

Test Plan: unit tests

Reviewed By: davejwatson@fb.com

Subscribers: wormhole-diffs@, fugalh, alandau, bmatheny, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2022181

Tasks: 6836580

Signature: t1:2022181:1430157032:df0bdfb9ca0d76b86d52c55c4ad41ea953a18cb4

Fix oss build

Summary: Fixing oss build

Test Plan: Visual analysis.

Reviewed By: pavlo@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D2023889

Signature: t1:2023889:1430144784:e58fe9e1f1193d71527ba5f5f2c2efb60bce7a2d

Blame Revision: D2022859

Introducing Unit!

Summary: title

Test Plan: tests

Reviewed By: hannesr@fb.com

Subscribers: exa, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2022859

Signature: t1:2022859:1429920863:0d3afce9779a790baf246de97f98812e23e1574d

IPAddressV6::kToFullyQualifiedSize.

Summary:
[Folly] IPAddressV6::kToFullyQualifiedSize.

The scenario: One has a string known to be a fully-qualified IPv4 or fully-qualified IPv6 address, but one does not know which of the two it is.

The dirty but fast solution: just check its size.

Test Plan: Build. Unit tests.

Reviewed By: mshneer@fb.com

Subscribers: folly-diffs@, dougw, yfeldblum, chalfant, brettp

FB internal diff: D2016634

Signature: t1:2016634:1429831808:08ecb28eab3060988f9613748ed8dabf3724bf13

makeFutureTry -> makeFutureWith

Summary: Similar to Promise::fulfil -> setWith change, this name is a lot clearer

Test Plan: tests

Reviewed By: hans@fb.com

Subscribers: netego-diffs@, fugalh, mwa, jgehring, fuegen, folly-diffs@, tingy, jsedgwick, yfeldblum, chalfant

FB internal diff: D2013124

Tasks: 6837405

Signature: t1:2013124:1429735106:e8861925dfeb6d7f0662c1057cbcf2ad8dcf008c

Change ThreadManager interface to Executor

Summary:
Change ThreadManager interface to more generic Executor interface. Specific example of supporting fibers. This diff would replace D1967655

Test Plan: added several unittests

Reviewed By: alandau@fb.com

Subscribers: doug, alandau, bmatheny, mshneer, folly-diffs@, jsedgwick, yfeldblum, chalfant, alikhtarov, andrii, yitingli

FB internal diff: D1994663

Signature: t1:1994663:1429640509:d729ce6f020563b680d1d549f9aa273c739eb925

Cleanup Future(Value) ctor

Summary:
We don't need to check for void after all, and with perfect forwarding we don't need separate const& and && versions.

Test Plan: tests still pass

Reviewed By: jsedgwick@fb.com

Subscribers: exa, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2014264

Tasks: 6847876

Signature: t1:2014264:1429735036:01ac166399ef8d0f2f34adb51e965809022c2b64

take collections by reference

Summary: This covers the ubiquitous case. If the approach is approved (the task mentioned changing impl to use 'auto for' so this is a bit different) i'll codemod callsites

Test Plan: unit

Reviewed By: hans@fb.com

Subscribers: trunkagent, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2013573

Tasks: 6779710

Signature: t1:2013573:1429735631:cfa0d3f6672a8966afc0ea18308307e2153793ce

Make MIN_WRITE_SIZE configurable for AsyncSSLSocket.

Summary:
MIN_WRITE_SIZE is used to avoid small write calls to SSL_write. If there are
consecutive small buffers to write, then will be combined together(by being
copied to a local buffer) until total size exceeds MIN_WRITE_SIZE. This reduces
number of calls SSL_write, improving performance, and avoiding overhead in OpenSSL.

Currently, MIN_WRITE_SIZE is hard coded to be 1500 bytes.

Wormhole could benefit from this, as our average message size is several
hundreds of bytes. We could get even better throughput with larger
MIN_WRITE_SIZE.

As discussed with Adam and Alan, there is a good reason to make it
configurable, though default value is still 1500.

Test Plan: unit tests

Reviewed By: simpkins@fb.com

Subscribers: net-systems@, ssl-diffs@, folly-diffs@, yfeldblum, chalfant, thomasf

FB internal diff: D1996570

Tasks: 6784543

Signature: t1:1996570:1429667035:a661ef30a715dafec3e134a7f6af6f56ada2e8e0

Add support for creating SocketAddress directly from IPAddress object

Summary:
Today it's hard to create SocketAddress from IPAddress
without converting to strings and back. This change adds this capability.

Test Plan: build

Reviewed By: yfeldblum@fb.com

Subscribers: ps, bmatheny, folly-diffs@, yfeldblum, chalfant

FB internal diff: D2011879

Signature: t1:2011879:1429733811:c05fc2d5ef5e9fdbbbb54ad26b4d1e3c0ad06dfa

future / fiber integration

Summary:
make future::wait() use fiber's baton, so wait works in threads or in fibers.

Much cleaner than making a new FiberRequest type in thrift

Test Plan: tests

Reviewed By: andrii@fb.com

Subscribers: doug, alandau, bmatheny, mshneer, andrii, folly-diffs@, yitingli, yfeldblum, jsedgwick, chalfant

FB internal diff: D1996283

Signature: t1:1996283:1429144165:da5dc6b1f2a053a45efd39877e79169e3fba810c

when* -> collect*

Summary: title

Test Plan: tests

Reviewed By: hans@fb.com

Subscribers: laser-diffs@, trunkagent, mhl, rhe, fbcode-common-diffs@, chaoyc, search-fbcode-diffs@, hero-diffs@, zeus-diffs@, vikas, cold-storage-diffs@, rtgw-diffs@, unicorn-diffs@, targeting-diff-backend@, netego-diffs@, apollo-diffs@, everstore-dev@, zhuohuang, zhguo, jying, darshan, apodsiadlo, alikhtarov, folly-diffs@, wch, lins, tingy, jsedgwick, thom, yfeldblum, petchean, iaroslav, qhuang, gus, san, tomasz, pknowles, lyang, chalfant, paggarw, stevenkim

FB internal diff: D2003300

Tasks: 6025255

Signature: t1:2003300:1429659170:e18999cba45e8aa9019aa94f1f29732076a274ad

fix collect() for move-only types

Summary:
as above. it never ends.

Test Plan: added unit

Reviewed By: hans@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2011569

Signature: t1:2011569:1429660210:930cb17682d5c86a11881a23efe0a91f4c6a36b1

then-with-Executor

Summary:
Pass an Executor to `then`, which applies only for that callback. This is on
the one hand just a convenience method, but it's a major convenience when it's
needed, because grabbing, storing, and restoring the old Executor in the
middle of a chain is very inconvenient indeed.

Test Plan:
new unit
docblock comments

Reviewed By: jsedgwick@fb.com

Subscribers: folly-diffs@, davejwatson, chalfant, yfeldblum, nkgupta, jsedgwick, exa, robbert

FB internal diff: D2011542

Tasks: 6771589, 6838553

Signature: t1:2011542:1429660204:f5959b1e0b3b36dfb8c3c7091302d19101dde93b

fix collect for non-default-constructible types, for real this time

Summary:
this was a fun one. Add a specialized implementation that builds up the results in a map with their indices and aggregates them into a vector at the end

Test Plan: unit tests

Reviewed By: hans@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2002444

Signature: t1:2002444:1429642589:ee5aa5e8c461db97a28642b9887b3158df317813

map()

Summary:
simple sugary syrup, best used in conjunction with collect/whenAll

Test Plan: unit

Reviewed By: hans@fb.com

Subscribers: trunkagent, folly-diffs@, jsedgwick, yfeldblum, chalfant, cgthayer

FB internal diff: D1999047

Tasks: 6045623

Signature: t1:1999047:1429570631:62361bb43dc5489fe3d4eb31af404faf8a765402

Assume exception when Executor::add throws

Summary:
Rather than crashing spectacularly, if `Executor::add` throws (e.g. because the queue is full), then discard the result we got and assume the exception the executor threw instead.

Alternatively, we could pass this exceptional Try to the callback (without an executor, as it is here), but not perturb `result_`. This would mean two different world views in these two code snippets:

auto f1 = makeFuture(42).via(&crappyExecutor);
f1.value(); // 42 (no callback happened)
f1.then(...); // would see the executor's exception. Would also be ill-advised to do this after value()

auto f2 = makeFuture(42).via(&crappyExecutor)
.then([](int x) { return x * 2; }); // skipped
f2.value(); // throws executor's exception

It feels rude to throw away the result, but it feels too potentially dangerous to allow this split view of the world.

Test Plan: modified unit

Reviewed By: jsedgwick@fb.com

Subscribers: exa, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2007729

Tasks: 5306911

Signature: t1:2007729:1429627114:b627ce758ce9231298f1b28e203ccc1ee415ed9a

revert D1985475, clang still borked

Summary:
This reverts commit bb08e2405dc68e6dab1f0066b15faa2821ad3dc7.

Test Plan: revert-hammer

Reviewed By: hans@fb.com

Subscribers: mathieubaudet, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D2006283

Signature: t1:2006283:1429556243:41e6b3189ce2da5a0f1a32a663ff8761628ca574

test failure conditions in LengthFieldBasedFrameDecoder

Summary: Moar unittests.

Test Plan:
unittests

Reviewed By: hans@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1959161

Signature: t1:1959161:1429292487:b7d10be35c2cf1d0bc1b399f4f523392a138a217

Revert "Revert "Deprecating folly::is_complete""

Summary:
This reverts commit 95a80fd4cb5a4b31b41b34fd24d591e0fc1b0650.

Test Plan: n/a

Reviewed By: andrewjcg@fb.com

Subscribers: trunkagent, folly-diffs@, yfeldblum, chalfant

FB internal diff: D2004342

Tasks: 6804947

Signature: t1:2004342:1429332777:4dd1c45e22ee4da69e5e84d3c5f67bada263f307

Blame Revision: D2002345

Revert "Deprecating folly::is_complete"

Summary: This reverts commit 42add531d4bdb1f95c40e41981f908a1b70865fb.

Test Plan: n/a

Reviewed By: andrewjcg@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D2002345

Tasks: 6804947

Signature: t1:2002345:1429296810:7db71fe4748d5c71f0f0486751ee426c2cdff653

then-with-Executor

Summary:
Pass an Executor to `then`, which applies only for that callback. This is on
the one hand just a convenience method, but it's a major convenience when it's
needed, because grabbing, storing, and restoring the old Executor in the
middle of a chain is very inconvenient indeed.

Test Plan:
new unit

Reviewed By: jsedgwick@fb.com

Subscribers: robbert, exa, folly-diffs@, jsedgwick, nkgupta, yfeldblum, chalfant, davejwatson

FB internal diff: D1985475

Signature: t1:1985475:1429148056:0450120263ba8110e8825420cbefe3b1887f7306

fix collect for non-default-constructible types

Summary: as above

Test Plan: compile

Reviewed By: agoder@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1999218

Signature: t1:1999218:1429217794:0278955bb471fe73a14ccedb59eae80b98acdbf3

README: Fixed typo, formatted code, and linked to docs

Summary:
(from @njormrod) This changes the READMEs to be .md,
appropriate for github. I viewed the docs on github, and they looked
WAY better as .md files.

Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Test Plan: view on github

Reviewed By: markisaa@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1999531

Tasks: 6783581

Signature: t1:1999531:1429220432:68c6d8dc70806d993c83cacce6369cb7e6e964c8

Remove unused variables

Summary:
This broke the HHVM (on ubuntu at least)

Test Plan:
compiled it

Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Reviewed By: andrei.alexandrescu@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1999341

Tasks: 6783581

Signature: t1:1999341:1429219016:235beef7522c4ada020eedf4f0a2ae200e94b7c8

Adds x64 arch-specific test

Summary:
Adds x64 arch-specific test inside the
if HAVE_X86_64

Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Test Plan: tests

Reviewed By: markisaa@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1999428

Tasks: 6783581

Signature: t1:1999428:1429220350:4287342a5a99823c9e4ffe20d0e47039f9fdbc0b

Update Copyright 2014 -> 2015

Summary:
Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Test Plan: Comments only

Reviewed By: markisaa@fb.com, yfeldblum@fb.com

Subscribers: fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1999373

Tasks: 6783581

Signature: t1:1999373:1429219027:225446bb418f3f8d65fb195682e4e7fe315ed41a

Deprecating folly::is_complete

Summary: Deprecating folly::is_complete. Replacement is fatal::is_complete.

Test Plan: unit tests

Reviewed By: njormrod@fb.com

Subscribers: njormrod, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1979124

Tasks: 6697454, 6697600

Signature: t1:1979124:1429153237:dc5736ed0f546dd4dd57bda9176e3c3c13b1235d

We might avoid some temporaries in putMessagesImpl

Summary:
This is folly github pull request https://github.com/facebook/folly/pull/184

It seems we might avoid some temporaries in putMessagesImpl
function. To do so we pass arguments directly to constructors
with the help of emplace_back member.

Test Plan:
All folly/tests, make check for 37 tests, passed.

Signed-off-by: Nicholas Ormrod <njormrod@fb.com>
Reviewed By: davejwatson@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1998515

Tasks: 6783581

Signature: t1:1998515:1429207683:056db129405bed212f50a50821f095c8d3694ec8

fix build

Summary:
^

Test Plan: compiles

Reviewed By: hans@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1998822

Signature: t1:1998822:1429211074:3ff9b0827a8ce029efa06a4a78ecea2b07eae3a8

runImmediatly fix

Summary: Should also work if eventbase isn't looping

Test Plan: added new unittest

Reviewed By: hans@fb.com

Subscribers: doug, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1984259

Signature: t1:1984259:1428691788:edb89424a48b8071a776d828300b7c1094f1c48f

collect()

Summary: title

Test Plan: unit

Reviewed By: hans@fb.com

Subscribers: fbcode-common-diffs@, targeting-diff-backend@, zhuohuang, thom, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1992144

Tasks: 6025255

Signature: t1:1992144:1429120337:7678f790dd0f383295c036e6627bdf417ae43fc7

fulfil -> setWith, fulfilTry -> setTry

Summary: title

Test Plan: tests

Reviewed By: hans@fb.com

Subscribers: cgist, cold-storage-diffs@, fugalh, atlas2-eng@, zhuohuang, folly-diffs@, jsedgwick, yfeldblum, chalfant, andrii

FB internal diff: D1994472

Tasks: 6768508

Signature: t1:1994472:1429117362:218c4fac3c88fcc8d37dc22ff8fe4135a73ec5d5

Instrument fibers execution

Summary: Add option to setup fibers' instrumentation.

Test Plan: Unit tests

Reviewed By: andrii@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1991638

Tasks: 6347990

Signature: t1:1991638:1429144487:3c3586b9943b4cc6bbef0297e48b8bffaf586f0d

Make sure we can't access LocalData when destroying it

Summary: We can access LocalData while currentFiber is set. We should make sure it's set to null when LocalData::reset is called.

Test Plan: unit test

Reviewed By: alikhtarov@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant, bwatling

FB internal diff: D1996071

Tasks: 6725667

Signature: t1:1996071:1429135408:d549d577e140ce2867aff4130e73be3884dbd2ed

onError(exception_wrapper)

Summary: title

Test Plan: unit

Reviewed By: hans@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant, hannesr, vloh

FB internal diff: D1984864

Tasks: 6045789

Signature: t1:1984864:1429116418:b4a9cdbb88f605a09b5753eea41dd970c96b9d4e

remove unnecessary & deprecated activate() call

Summary: let's not do this to ourselves :)

Test Plan: unit

Reviewed By: yfeldblum@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1993491

Signature: t1:1993491:1429063112:b8664b365ad12fa4b51e9bd7fde9e4d197dbc648

Ensure the loop callback is scheduled when the ready queue is not empty

Summary: Previously we'd call ensureLoopScheduled() but it'd be a no-op since the loop was already scheduled. Delaying the call to ensureLoopScheduled() fixes the issue

Test Plan: unit tests (FiberManager.yieldTest fails without the changes to FiberManager-inl.h)

Reviewed By: andrii@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1993686

Signature: t1:1993686:1429070253:af933abbbbb33868a402f1d643e4e6f5fef1be83

fix race in ~ThreadWheelTimekeeper

Summary:
During destruction, we enqueue a callback to `eventBase_` that references `wheelTimer_`.

So long as that callback exists, we have a circular dependency as both reference the other and we -cannot- safely destroy this object (and its members). The fix is to break this dependency someway. In this case, I've chosen to simply `AndWait` until the eventBase has consumed the message referencing the timer. From here normal destruction of members can proceed safely (destorying HHWheelTimer first, EventBase second).

The problem in the current code is that the Eventbase will attempt to consume all messages during it's own destruction. If `wheelTimer_->cancelAll()` is still enqueued, it will attempt to use the now destroyed `wheelTimer_`.

Test Plan:
Running this test repeatedly was able to repro:

./folly/futures/futures-test --gtest_filter=Timekeeper.futureWithinVoidSpecialization

Reviewed By: yfeldblum@fb.com

Subscribers: enis, folly-diffs@, jsedgwick, yfeldblum, darshan, chalfant

FB internal diff: D1985967

Tasks: 6332729, 6741095

Signature: t1:1985967:1428726270:997ec277c6a73554e54b8cf673acd36ff62976e6

parse flags in unit tests

Summary: This code has useful logging when turned up high enough (e.g. --v=11). But we need to parse the flags to see it.

Test Plan: trial & error

Reviewed By: yfeldblum@fb.com

Subscribers: enis, folly-diffs@, jsedgwick, yfeldblum, darshan, chalfant

FB internal diff: D1985965

Signature: t1:1985965:1428713065:4607610ec438416fffb5fced1867efa13544eef0

(rx) Include types.h first

Summary: We need to do forward declarations first, and types.h already does declarations, so just make sure it gets included first in each file.

Test Plan:
tests

Reviewed By: davejwatson@fb.com

Subscribers: trunkagent, fugalh, exa, folly-diffs@, jsedgwick, yfeldblum

FB internal diff: D1861040

Tasks: 6258585

Signature: t1:1861040:1428604059:de6393e3c87e0694a6b04ad6d440cc9635a1008d

Bump version to 35:0

SharedMutex potential lost wakeup with exactly 3 or 4 contending writers

Summary:
SharedMutex used a saturating counter that records the number of
waiting lock() calls, but an ABA problem on futexWait could lead to a lost
wakeup when there was exactly 3 or 4 threads contending on the RW lock
in W mode. This diff changes the kWaitingE count to be heuristic (it is
possible that the count says 1 but there are two waiters), saturates at
2 instead of 3 (because there is no benefit from differentiating those
two), and doesn't decrement the count on a successful wakeup.

Also, I noticed while debugging this that boost::noncopyable was causing
SharedMutex to be 8 bytes when it should only be 4.

One way the wakeup could be lost in the old code:

1. A calls lock()
2. A updates state <- kHasE
3. A returns
4. B calls lock()
5. B spins
6. B updates state <- kHasE + 1 * kIncrWaitingE
7. A calls unlock()
8. A updates state <- 0
9. A calls futexWake(), which returns 0
10. A calls lock()
11. A updates state <- kHasE
12. A returns
13. C calls lock()
14. C spins
15. C updates state <- kHasE + 1 * kIncrWaitingE
16. C calls futexWait, expecting kHasE + 1 * kIncrWaitingE
17. B calls futexWait, expecting kHasE + 1 * kIncrWaitingE
18. A calls unlock()
19. A updates state <- 0
20. A calls futexWake(), which returns 1
21. C receives the wakeup
22. C updates state <- kHasE
23. C returns
24. C calls unlock()
25. C updates state <- 0

B missed the wakeup that was intended for it (sent at step 9, wait
started at step 17), but went to sleep anyway because it saw the write
state at step 17. Now there are two waiters but only 1 recorded in the
SharedMutex, at which point failure is inevitable.

Test Plan:
1. DeterministicSchedule test using uniformSubset that can repro the problem
2. Test in production scenario that produced occasional deadlocks under high stress

Reviewed By: yfeldblum@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1980210

Tasks: 6720328

Signature: t1:1980210:1428623932:ef1c00c3f88154578b2b253ac0cfdbadf9f31d8c

Move StringHandler to its own file

Summary: Move this from a test to its own file in codec folder

Test Plan:
already has a unittest
fbconfig -r folly/wangle; fbmake runtests

Reviewed By: hans@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1959152

Signature: t1:1959152:1427935371:9d1338986df97fd94f98ad2bf08c731d229bc2b1

LineBasedFrameDecoder

Summary: Copy of netty's line based decoder.

Test Plan:
unittests
fbconfig folly/wangle/codec; fbmake runtests

Reviewed By: hans@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1959155

Signature: t1:1959155:1427935150:e11280c5567df9ad9964dbb656aa090267856f57

Pipeline OutputBufferingHandler

Summary: Part 2 of pipeline.  Use OutputBufferingHandler, which is exactly the same output buffering thrift does currently.

Test Plan:
A couple canaries, unittests.
Specific issues of previous pipeline diffs I think are fixed already and should be fine with this one:
* Previously there were missing DestructorGuards.  I don't think anything in OutputBUfferHandler needs a DG
* previously broke http GET handling.  There is a unittest for it now.

Canary

Reviewed By: alandau@fb.com

Subscribers: doug, fugalh, alandau, bmatheny, mshneer, folly-diffs@, jsedgwick, yfeldblum, chalfant, vloh, andreib

FB internal diff: D1970949

Signature: t1:1970949:1428360621:a0db142032894525f69c2b144cf946d63f790fe1

folly: MemoryMapping: add offset/size params to advise

Test Plan: ran it

Reviewed By: philipp@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1974936

Signature: t1:1974936:1428453023:1a83ed8336f75b745bffc633b8471231423b0fb0

folly: MemoryMapping: respect writable when opening the file

Summary: the file needs to be opened with write-permissions before it can be mmaped with PROT_WRITE.

Test Plan: n/a

Reviewed By: philipp@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1974895

Signature: t1:1974895:1428451664:1106019abf02b9de659ce0d305e3d788ae7d60bc

AsyncSocketHandler cacheChainLength

Summary:
Is there any reason we shouldn't just cache the chain length everywhere?

Currently the pipeline does a lot of passing of buffers between IOBufQueues, I wonder if we can get even smarter about passing the length around

Test Plan: used in telnet server diff

Reviewed By: hans@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1959167

Signature: t1:1959167:1427934568:eb9a49514b2bb7d157879bb8efa99f12092d5e95

Remove FiberManager move-constructor

Summary:
LoopController and Fibers keep references to FiberManager, so implementing move-constructor for it is non-trivial.
The only purpose of move constructor was to have a create() static method, replaced it with a constructor accepting a type tag.

Test Plan: unit test + tao build

Reviewed By: stepan@fb.com, pavlo@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1971881

Signature: t1:1971881:1428374073:945d913e69eaa6f957dace981c23835105d91935

AsyncUDPServerSocket passes socket in callback

Summary: AsyncUDPServerSocket doesn't make it easy to write to the same socket you read from. Add the socket as a callback param, similar to AsyncServerSocket

Test Plan:
fbconfig -r folly; fbmake dbg

Will fixup any other spots contbuild finds

Reviewed By: hans@fb.com

Subscribers: bmatheny, doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1948936

Signature: t1:1948936:1427841651:20d13d73c06d31c75056624f051a6fd35b9701fb

Add ability to yield execution of the currently running fiber

Summary: This diff allows fibers to explicitly yield execution to other fibers and the event loop

Test Plan: unit tests

Reviewed By: andrii@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant, tao-eng@

FB internal diff: D1965297

Signature: t1:1965297:1428082686:e524e9dd21b3fb951e1d3556e4cb3eedc3e6511a

Fix open-source Makefiles after fibers were moved to folly

Test Plan: contbuild

Reviewed By: pavlo@fb.com

Subscribers: alikhtarov, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1966698

Signature: t1:1966698:1428367351:62f2218c23d4911c15055917c0fbae31a2420903

GlobalExecutor.h include Executor.h and IOExecutor.h

Summary: We were forward-declaring `Executor` and `IOExecutor` for great compilation speed. However, this leaves users of this header to include at least one of those headers in their cpp file to actually use it, and that's kind of annoying. `Executor` and `IOExecutor` are not templated and are quite small, so it seems like the compilation speed benefit is minimal compared to the convenience factor, so this diff just includes the two headers. (Probably including `Executor.h` is redundant since `IOExecutor.h` probably includes it, but for completeness and explicitness, and in case `IOExecutor` also just forward-declares `Executor` now or in the future.)

Test Plan: stuff still builds

Reviewed By: davejwatson@fb.com

Subscribers: fugalh, exa, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1970179

Signature: t1:1970179:1428351076:e9c3700a868688035e7ff50486b8cead751d3c02

Add FiberManager local type

Summary: This adds local type for each FiberManager. Only local of given type can be created on fibers of this FiberManager. Locals of other types will be just treated as regualar thread-locals.

Test Plan: unit test

Reviewed By: bwatling@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1969739

Signature: t1:1969739:1428345931:aff5deb526c179158e5881b29330ff3f6698149a

Option to record precise stack on every N fiber

Summary: title + some logging around

Test Plan: mcrouter unit tests

Reviewed By: andrii@fb.com

Subscribers: alikhtarov, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1965097

Signature: t1:1965097:1428103637:341ff705c9d11c730197828256ec0b790ee7afaa

shared ptr vector sockets

Summary: promote the sockets vector to a shared_ptr, since both ServerWorkerPool and ServerBootstrap use it. Otherwise there are destruction order issues between ServerBootstrap and any IOThreadPoolExecutor you use

Test Plan: Saw use after free in D1942242, gone after this.

Reviewed By: yfeldblum@fb.com

Subscribers: chalfant, doug, fugalh, folly-diffs@, jsedgwick, yfeldblum

FB internal diff: D1947553

Signature: t1:1947553:1427484417:5b78f5c9c70d244d3f52a6f71b6d1fab7b29d106

Use Fiber locals for TAO Fiber-locals

Summary:
This simplifies TAO fibers locals, using FiberManager based fiber-local storage.
This depends on D1958135.

Test Plan: integration tests

Reviewed By: bwatling@fb.com

Subscribers: alikhtarov

FB internal diff: D1962214

Signature: t1:1962214:1427997755:b546b9039382a7600f234b0a2a60cc96da34e662

Fiber-local context

Summary: This adds fiber-local context, which behaves more like static objects+fork rather than thread-locals.

Test Plan: unit test

Reviewed By: pavlo@fb.com, bwatling@fb.com

Subscribers: rushix, alikhtarov, bwatling

FB internal diff: D1958135

Signature: t1:1958135:1427999426:8e4b89f4af53a1a119b2e5a765fb549dd8442c50

Add static method to skip SSL init

Summary:
Some things like gSOAP, initialize SSL only to have SSLContext stomp over their
work. Add a method to allow flagging SSLContext as "initialized" to use the
existing global state.

Test Plan:
Tested running mcrouter and paymentnegined to verify existing
functionality appears normal.

Reviewed By: subodh@fb.com

Subscribers: ssl-diffs@, folly-diffs@, yfeldblum, chalfant, dihde

FB internal diff: D1959936

Tasks: 6655251

Signature: t1:1959936:1427994292:8b2be1742ef17a5ec2c7b3ad37787d2cf4d142a6

Bump version to 34:0

Update Makefile.am for AsyncSignalHandler

Summary: facepalm

Test Plan: Built proxygen OSS that depends on this symbol

Reviewed By: davejwatson@fb.com

Subscribers: doug, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1963679

Signature: t1:1963679:1428006035:2c4ceffc046b995431cde2fbcef757fa7ea1ea0b

Move mcrouter/lib/fibers to folly/experimental/fibers

Summary:
The mcrouter fibers library is quite general purpose and reusable by other projects. Hence I'm moving it into folly.

Test Plan:
fbconfig -r folly/experimental/fibers && fbmake runtests
fbconfig -r mcrouter && fbmake runtests
fbconfig -r tao && fbmake
fbconfig -r ti && fbmake

Reviewed By: andrii@fb.com

Subscribers: vikas, zhuohuang, jmkaldor, jhunt, pavlo, int, aap, trunkagent, fredemmott, alikhtarov, folly-diffs@, jsedgwick, yfeldblum, chalfant, chip

FB internal diff: D1958061

Signature: t1:1958061:1428005194:b57bfecfe9678e81c48526f57e6197270e2b5a27

Bump version to 33:0

UDP bind via port or address

Summary: Bind via port or address, similar to tcp

Test Plan: I wrote a unittest that tested v4 vs v6 binding - can't check it in because we have v6 only clusters though. Not sure how eles to write a unittest without picking specific ports

Reviewed By: hans@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1948938

Signature: t1:1948938:1427841721:621031320981bf366a8252a0ea1d4491b694ea24

Move TAsyncSignalHandler into folly

Summary:
TODO item, trying to remove unecessary dependencies on thrift

Test Plan: Unit tests

Reviewed By: davejwatson@fb.com

Subscribers: doug, fbcode-common-diffs@, davejwatson, andrewcox, alandau, bmatheny, anca, darshan, mshneer, folly-diffs@, bil, yfeldblum, haijunz, chalfant

FB internal diff: D1960215

Signature: t1:1960215:1427920934:8abd7e94c50676b05bf7ff79800df0db1bd04266

Add socket mocks

Summary: These parallel the MockTAsync* from thrift/lib/cpp/test. Once all the users of the thrift versions are gone they can be deleted

Test Plan: Unit tests

Reviewed By: yfeldblum@fb.com, alandau@fb.com

Subscribers: doug, net-systems@, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1959979

Signature: t1:1959979:1427917909:19af219f88dd6847a064da986dd30765e29bdc99

Move AsyncSocket tests from thrift to folly

Summary: These tests belong with the code that they test. The old tests had a couple dependencies on TSocket/TSSLSocket, so I wrote a BlockingSocket wrapper for AsyncSocket/AsyncSSLSocket

Test Plan: Ran the tests

Reviewed By: alandau@fb.com

Subscribers: doug, net-systems@, alandau, bmatheny, mshneer, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1959955

Signature: t1:1959955:1427917833:73d334846cf248f8bb215f3eb5b596df7f7cee4f

Move AtomicLinkedList to folly

Summary:
Adding new atomic data structure from the mcrouter project.

Test Plan: fbconfig -r mcrouter && fbmake runtests

Reviewed By: andrii@fb.com

Subscribers: alikhtarov, folly-diffs@, yfeldblum, chalfant, achao, jpearce

FB internal diff: D1960219

Signature: t1:1960219:1427921204:78e5313ea916b8a249d32e31cc7ba1aa9e890d95

(Wangle) Swap order of Try<T> and T matching

Summary:
See the test case and D1958860.

I don't really know why I chose one over the other. This fixes a bug. So
it's better?

Test Plan: Run all the tests?

Reviewed By: yfeldblum@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant, over

FB internal diff: D1960740

Signature: t1:1960740:1427927644:25093b049a1519d7c869ee7043f3caced4cc971e

Add support for writev for AsyncUDPSocket

Summary:
I have 2 local buffers and instead of allocating iobufs
on the heap, I can simply use iovec on the stack to send.

Test Plan: Unit tests and turn server.

Reviewed By: davejwatson@fb.com

Subscribers: folly-diffs@, ehrhardt, yfeldblum, chalfant, paramr

FB internal diff: D1956201

Signature: t1:1956201:1427918649:09f00399fd9e8ed3fe62be43b19adbf0a5a3f3b0

Minor fixes from documentation

Test Plan: unittests

Reviewed By: jbrewer@fb.com, ashishsharma@fb.com

Subscribers: maxime, folly-diffs@, yfeldblum, chalfant

FB internal diff: D1956101

Signature: t1:1956101:1427828321:2d828e6f2c06c6dcd6e7baa3ed5e72ee59d9b77f

improve split() docs

Summary:
From reading the docs, I assumed that casting exceptions would be caught. Let's clarify this.

Test Plan: readingiskey

Reviewed By: yfeldblum@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant

FB internal diff: D1960186

Signature: t1:1960186:1427920471:b7aa2af38a90a986418b98294fc0f69e678f0d1e

(Wangle) Allocate lambda space inside Core instead of inside std::function

Summary:
Taking this trick that is used in the fibers library. We can keep 64
bytes of space inside `Core` to allocate the callback lambda into,
instead of having `std::function` do another `malloc`. This seems to
greatly improve the synthethic benchmark, and hopefully production
workloads, too, by reducing the number of mallocs.

64 bytes were picked because it fits all the lambdas in the futures
tests. We might want to adjust this based on production data...?

https://fb.intern.facebook.com/groups/715931878455430/permalink/837898842925399/

Test Plan: Run all the tests for all platforms, compilers, and Windtunnel.

Reviewed By: hans@fb.com

Subscribers: chalfant, meisner, folly-diffs@, jsedgwick, yfeldblum

FB internal diff: D1931620

Signature: t1:1931620:1427841595:6ec667b58980be232dfb116bc316148bb67de4fc

stop in same thread

Summary: In a couple places in ServerBootstrap there is code that needs to run in the EB, but if we are already in the EB, it's fine to run it inline. Maybe this should be a method on EB directly? There is runInEventBaseThreadAndWait(), but it explicitly disallows this usage.

Test Plan: used in D1942242, deadlocks without this, since stop() was called in the same eb

Reviewed By: yfeldblum@fb.com

Subscribers: chalfant, doug, fugalh, folly-diffs@, jsedgwick, yfeldblum

FB internal diff: D1947581

Signature: t1:1947581:1427831021:d1d08ff9a4a00501d6be60670709fcb17af04134

Move OpenSSL uninitialization to a separate function

Summary:
The current behaviour of SSLContext is subject to a bug where an instance going
out of scope at the wrong time can decrement the global refcount to 0, causing
the destructor to destroy the SSL context. Instead, this requires callers to
explicitly uninitialize the SSLContext instance and assume the risk of wrongly
destroying the global SSL context.

Test Plan:
Tested with mcrouter

Reviewed By: subodh@fb.com

Subscribers: afrind, ssl-diffs@, folly-diffs@, yfeldblum, chalfant, dihde, melitam

FB internal diff: D1949649

Tasks: 6358211

Signature: t1:1949649:1427854689:aea2dc801f63256ff64188b0f7a15121dcecee69

Get access to EventBaseManager object

Summary: as title

Test Plan: run unit tests

Reviewed By: yfeldblum@fb.com

Subscribers: ming, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1955074

MPMCQueue - FPE to invalid_argument for 0 capacity

Summary:
If an MPMCQueue was initialized with an explicit zero capacity, it would
try to compute stride for zero and trigger SIGFPE which pretty fatally
killed the process -- but in a way that required gdb to figure out the
root cause.

This replaces that with a std::invalid_argument exception, which
includes a description of the problem and should make fixing this user
error much faster.

Test Plan:
GTEST unit test added to verify behaviour; if this didn't work it would
SIGFPE and abort the test script, which is probably a good indicator
that something went wrong. :)

fbconfig -r folly && fbmake runtests

Reviewed By: ngbronson@fb.com

Subscribers: chalfant, folly-diffs@, yfeldblum, rkomorn

FB internal diff: D1930978

Signature: t1:1930978:1427740315:cc06a8b9f3c314b956ae41f813b2f904d3e979c9

Default accept function in Acceptor

Summary: Since Acceptor can be used for TCP or UDP, make an empty default TCP accept function so subclasses don't have to.

Test Plan:
built D1942242, no build errors

contbuild

Reviewed By: yfeldblum@fb.com

Subscribers: doug, fugalh, folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1948940

Signature: t1:1948940:1427498977:26b7bb23e3367ff6695dad86ebf0e60637815a7b

EventBase::runImediatelyOrRunInEventBaseThreadAndWait.

Summary:
[Folly] EventBase::runImediatelyOrRunInEventBaseThreadAndWait.

When you have code that you need to run in the event loop and wait for it to finish, and you yourself might be in the event loop but might be in another thread instead.

Test Plan:
Unit tests:
* `folly/io/async/test/EventBaseTest.cpp`.

Reviewed By: davejwatson@fb.com

Subscribers: folly-diffs@, yfeldblum, chalfant, agallagher, njormrod, ldbrandy, brettp, dougw

FB internal diff: D1953110

Signature: t1:1953110:1427751076:ad2c9f4d5b65ef952cba94b06be887672ee44583

Fixing predicate inlining

Summary:
as title.

Test Plan: run unit tests

Reviewed By: yfeldblum@fb.com

Subscribers: ming, fugalh, folly-diffs@, jsedgwick, yfeldblum, ridge@

FB internal diff: D1946589