Summary: Because the `break;` can be dead, and sometimes is indicitive of a different type of error.

Reviewed By: meyering

Differential Revision: D4310056

fbshipit-source-id: ad215eb9b2e5bb4d5c703582203efce893b26a76

Summary: To monitor client support of TLS 1.3.

Reviewed By: ngoyal

Differential Revision: D4308473

fbshipit-source-id: cb6fb444c8b7ced39e6655a0f63b18523c2fb9c5

Summary:
In AsyncSSLSocket tests the shared_ptr structure means that the
AsyncSSLSocket-s outlive the stack-allocated EventBase on which they were
created.  Previously there were scattered calls to detachEventBase on the
last interesting callback, but several calls were missing.  This diff
switches to a model where the SSLServerAcceptCallbackBase is responsible
for detaching the sockets.

This diff also fixes a low-firing race between shutdown
of the TestSSLAsyncCacheServer Main thread and a call to
EmptyReadCallback::readEOF.  Most uses of EmptyReadCallback don't attach
the TCP socket, so they can't actually tolerate a call to readError
or readEOF.

These use-after-destruction problems were discovered by UBSAN.

Reviewed By: djwatson

Differential Revision: D4301416

fbshipit-source-id: 127fb5e506d0694c5ca81d7a38c704d69f4ab3eb

Summary:
Because the extra semicolons are useless and all typos...
GCC doesn't have this warning. Neither does MSVC, but that won't stop me.

Reviewed By: igorsugak

Differential Revision: D4304218

fbshipit-source-id: a06586edc6b9bafd5dd074e9fd4e0ed152181abc

Summary:
This accounts for the places that were triggering warnings 4456, 4457, and 4458, which are all related to shadowing names, be they locals, parameters, or even types.
This doesn't deal with 4459, which is specifically for shadowing global variables, because folly/gen defines globals by the name of `count`, `min`, `max` and a few other similar names.

Reviewed By: meyering

Differential Revision: D4296781

fbshipit-source-id: a2e625095e2c65a53a9226b000aaf0ca95a3a393

Summary:
Do the barrier completion test in a loop. (std::condition_variable has pthreads-style spurious wakeups).

(Sorry for missing this in review).

Reviewed By: djwatson

Differential Revision: D4302035

fbshipit-source-id: 3322d6a0ffba8c47c46bafb1d88034e1a0a9c652

Summary: Add fairness benchmark, contended benchmark

Reviewed By: davidtgoldblatt

Differential Revision: D3706680

fbshipit-source-id: 01814fcd6b0cc3dd12815a2b2c248abc6a3771ec

Summary: It deletes things even when input isn't in the container.

Reviewed By: luciang

Differential Revision: D4298340

fbshipit-source-id: 3e8fc04c2c21eb231dcaf82239ac5f6d25e49e2c

Summary:
`condition_variable::wait_for` takes as second param `std::chrono::duration`
and not a predicate; what we want is `condition_variable::wait`.

Reviewed By: simpkins

Differential Revision: D4295305

fbshipit-source-id: 05f735fe6e7ecb9d8f42cb38a2985b9ce9dad984

Summary: MSVC has the ability to warn about implicit truncations and places where implicit sign coercions are occuring, so do some cleanup to make it possible to compile with the warnings enabled.

Reviewed By: yfeldblum

Differential Revision: D4288028

fbshipit-source-id: f8330c62b2dcb76f696dfc47888f0e3e1eefc21a

Summary: [Folly] Cut some includes from `Executor.h`.

Reviewed By: mzlee

Differential Revision: D4256618

fbshipit-source-id: 1728f48b3c0ec4e0c4c84c44bd8afb583d438129

Summary:
Nothing defines USE_JEMALLOC in the OSS build today and that causes
some portability problems.

Specifically, the homebrew recipe will make libjemalloc available and our
configure script will detect it and add it to the library flags.

Our subsequent check for `malloc_usable_size` then finds this function in
libjemalloc.

When later attempting to build wangle against the homebrew folly we get
compilation failures because the prototype for `malloc_usable_size` is only
available in the jemalloc headers and nothing in the saved configuration for
folly is set up for this to be pulled in as it it guarded by `USE_JEMALLOC`.

This attempts to resolve the situation by forcing on `USE_JEMALLOC` when
we detect the library in configure.

This is made a little more complicated because we cannot set `USE_JEMALLOC`
in the OSS build; it gets rewritten to have a `FOLLY_` prefix.  Since we
have code outside of folly that requires that this symbol be `USE_JEMALLOC`,
I've changed the conditional to check for both flavors of the symbol, with
and without the prefix.

Reviewed By: yfeldblum

Differential Revision: D4289176

fbshipit-source-id: 756bc815c3ef1fac454e603feb72155d98c5aadd

Summary: Inspired by http://wg21.link/p0259, folly::BasicFixedString is a std::string replacement that is usable in constexpr contexts. It uses an internal fixed-size buffer to store up to N characters, where N is a template parameter.

Reviewed By: luciang

Differential Revision: D4249529

fbshipit-source-id: 10f12ea2510a8d21ec60a07a8f15ecc3e35c5431

Summary:
`stdin`, `stdout` and `stderr` are macros that expand to function calls with the MSVC CRT implementation. This is also the case for musl-libc. This means that Subprocess simply cannot be compiled on those platforms without changing the API.
To solve that, we change the API and deprecate the old API.

For more fun, `stdin`, `stdout` and `stderr` are also macros in glibc, they just expand to other identifiers rather than a function call.

Reviewed By: yfeldblum

Differential Revision: D4229544

fbshipit-source-id: 97f1a3b228b83cfdcaffee56d729063ea235e608

Summary: Fix use-after-destroy of NewThreadExecutor.  Detected by opt-ubsan tests.

Reviewed By: yfeldblum

Differential Revision: D4291900

fbshipit-source-id: 206f1d7b80fa04e1570e4b7a20e50b9a8ceb7bcb

Summary:
Freshly opened TCP sockets can have a send buffer size bigger
than wmem_default, because connection parameters are cached in the
route cache.  Some of the async socket tests assumed that writing 8M of
data was enough to guarantee blocking behavior, but since wmem_max is
20M on our systems the resulting tests are flaky.

Reviewed By: marcinpe

Differential Revision: D4292201

fbshipit-source-id: ba5d606d080330e455eee2b17bcae6cf546bf981

Summary:
Add the default move constructor and move operator
to EvictingCacheMap so it can be moved.

Reviewed By: markisaa, luciang

Differential Revision: D4287472

fbshipit-source-id: 130e9d5467d6da14ba95a9e769cf8e8d541a704c

Summary: UBSAN instrumentation results in more stack being used. Applying the same logic we already have for ASAN there.

Reviewed By: igorsugak

Differential Revision: D4287455

fbshipit-source-id: 1a224cb5a3654c23b15fa298bf80476234a1418c

Summary: MacAddress only needs to include ostream and the test header does not need iostream.

Differential Revision: D4286405

fbshipit-source-id: e64fdd4e8428c62279ed7c185188f3dfc14096d3

Summary:
We do not need it and it adds a static initialization

This is the last extra one in liger. The other places actually need iostream to print things

Reviewed By: yfeldblum

Differential Revision: D4286095

fbshipit-source-id: 44a827e48e9fb9106626e784592eb194dff83bf6

Summary:
The benchmark API only supports `unsigned int` as the iteration number, so this being 64-bit means it has to be truncated for no reason.
This change gets us closer to being able to enable MSVC's implicit truncation warnings.

Reviewed By: yfeldblum

Differential Revision: D4281264

fbshipit-source-id: 27397e3f23bace20f3cc457665ea6f21bf994da5

Summary:
I was getting an error when running commands in
https://our.intern.facebook.com/intern/dex/fibers/gdb/

Reviewed By: andriigrynenko

Differential Revision: D4283229

fbshipit-source-id: fe45847d0ec6cadfbce6fe9818066cce3e275a46

Summary: overload constexpr_strlen to work with other character types

Reviewed By: yfeldblum, luciang, Orvid, ot

Differential Revision: D4269654

fbshipit-source-id: 2fcd666669efb51d77e847ff31bda3a301e763da

Reformulate constexpr_min and constexpr_max to achieve stability in sorting as described in http://stepanovpapers.com/notes.pdf

Summary: There is a famous long-standing "bug" in the standard library regarding the semantics of min and max wrt values that are equivalent wrt op< but not equal. Let's not make the same mistake with constexpr_min and constexpr_max.

Reviewed By: yfeldblum, luciang, Orvid, ot

Differential Revision: D4269635

fbshipit-source-id: 19b464c949dc0cf07afb08eaf657ae8b242ca42d

Summary:
Fix potential double close() on exception when SO_REUSEPORT fails.
The fd will be closed twice, once by close() and second by the scope guard above.

Reviewed By: yfeldblum

Differential Revision: D4272300

fbshipit-source-id: a163be822d7522cadb9dc3c3eddca10df453de14

Summary:
MSVC was getting thoroughly confused while trying to eval the constexpr function, so switch it to a template instead.
MSVC was also failing to wrap it's head around what a NodeRecycler is, so delay its resolution via typename.

Reviewed By: yfeldblum

Differential Revision: D3478755

fbshipit-source-id: f687f4538fb12ef8eee525557f4cc988a09e714d

Summary:
This makes the changes required to allow folly to compile cleanly with the sign/unsigned mismatch warnings 4388 and 4389, as well as with warnings 4804 and 4805, which are about comparisons between scalars and bool.
Most of the changes in this are to `DCHECK_*` calls which are translated to a templated call which does the comparison internally based on the inferred type of the argument, which for a literal `0` is `int`, causing the warnings to get generated when the comparison is done.

Reviewed By: yfeldblum

Differential Revision: D4253427

fbshipit-source-id: cd17973a78e948a62c886a2959f9abf40a69f9f5

Summary: This brings the EventBase functionality of getting a timer for the eventbase into the virtual interface

Differential Revision: D4264135

fbshipit-source-id: e5526610eca808e1d7b549a7cd6cd7b2c65d3ce1

Summary:
Add a utility function to more safely set a file's contents by writing to a
temporary file first, then renaming the temporary file into place.  On Linux
systems where renames are atomic, this ensures that the operation either
succeeds or that the old file state is left unchanged on failure.

Note that unlike most of the other APIs in FileUtil.h, I intentionally made
writeFileAtomic() throw an exception on failure.  This is implemented using a
lower-level writeFileAtomicNoThrow() version.  Callers who care about the
exception overhead can use the lower level version instead.  (Exception
overhead should be relatively low compared to the file I/O operations, though,
so I suspect most users will prefer the throwing APIs.)

Reviewed By: yfeldblum

Differential Revision: D4253964

fbshipit-source-id: 5301e2791b82c6f90b63bb509b0411841c266705

Summary:
[Folly] `Future<typename>::getTryVia`.

We have `waitVia` and `getVia` and `getTry`, but `getTryVia` was missing.

Reviewed By: fugalh

Differential Revision: D4254972

fbshipit-source-id: 403e1a3496ad5dfc93c4c55ab75a83bcc89e6c64

Summary:
Fix test for AsyncSSLSocket. When a timeout
occurs during a handshake it's possible that
invokeConnectError is called with sslState_ ==
CONNECTING. This just removes the assertion in
this case. This doesnt affect prod code, only
tests

Reviewed By: yfeldblum

Differential Revision: D4252677

fbshipit-source-id: 4db3a94ae28aa140546554c087bedcee7f06d201

Summary:
Switching ServiceRouter code to use VirtualEventBase instead of EventBase allows us to have same thread-pool shared between multiple ServiceRouter instances.

In future this allows us to replace EventBasePoolImpl with some generic thread-pool implementation (e.g. IOThreadPoolExecutor). It also makes it trivial to have ServiceRouter run on a any existing thread-pool if necessary.

Reviewed By: smichelson

Differential Revision: D3935283

fbshipit-source-id: 3275bbace15a0df8b06d12c970ccc098a631658d

Summary: folly::SingletonThreadLocal should be used for all thread-local singletons to avoid SDOF.

Reviewed By: yfeldblum

Differential Revision: D4253009

fbshipit-source-id: 5b4ca57a7a77b7b54c94630a2a29d13b84a3af27

Summary:
Truncations should be explicit, but for some reason, MSVC seems to be the only compiler that will warn you when you implicitly truncate integer or float values.
This allows Folly to be compiled with warnings 4018, 4242, 4244 and 4305 enabled.
Technically 4018 is a sign mismatch warning, but there was only one place it was being triggered so I included it anyways. The other 3 are warnings for implicit truncation.

There is one other implicit truncation warning that currently triggers in Folly, 4267, but there are a lot more places where that triggers so I'll do that in a separate diff.

Reviewed By: yfeldblum

Differential Revision: D4249471

fbshipit-source-id: e18a93d85856c998576934a6229c9edd1638a54e

Summary: Using newly added `StaticTracepoint.h`, add a Tracepoint for `RequestContext` switch that could be enabled by compiler flag.

Reviewed By: drarmstr

Differential Revision: D4238658

fbshipit-source-id: 043a035ba8251b48d7b29d63a2219ad2edda164f

Summary: More constexpr is better!

Reviewed By: yfeldblum, luciang, ot

Differential Revision: D4244996

fbshipit-source-id: 30a9b726c115a92bb18538d7f18e50eccb0a1ef6

Summary: If a write request is buffered after a partial write, then bytes written is not updated after subsequent write operations (`performWrite`) for the buffered write request (`BytesWriteRequest`). This results in a wrong value for totalBytesWritten_, which is reported in the error callback in case the write request fails.

Reviewed By: yfeldblum

Differential Revision: D4205743

fbshipit-source-id: f77ca55ccfdceda1008c45e72ec093b00bf250e4

Summary:
Make folly::Singleton fail if singleton is requested before registrationComplete. By doing this we disallow any folly::Singleton to be created before main().

Strict mode is still disabled for Python and Hs.

Reviewed By: yfeldblum

Differential Revision: D4121322

fbshipit-source-id: b66c23e24f6a7324cd12ddb77cad960e0950a1aa

Summary: Closes https://github.com/facebook/folly/pull/520

Reviewed By: pixelb

Differential Revision: D4243347

Pulled By: yfeldblum

fbshipit-source-id: cae0b36abdc7807afc188220f7f421f2a3bbc973

Summary: D4194834 broke the OSS build.  Ubuntu 14.4 has r114 in its repo, so support it.

Reviewed By: yfeldblum

Differential Revision: D4224129

fbshipit-source-id: c85e95716ee1a08b33455bfe6fc9f7712d226edf