Summary: There are a few places that need this, so make it so.

Reviewed By: yfeldblum

Differential Revision: D3667234

fbshipit-source-id: 84c16e1b036d9c2afddf03aa84c43210c5672f0a

Summary: Well, make it compile anyways. There's no simple equivelant for Windows, so just return 0 instead.

Reviewed By: yfeldblum

Differential Revision: D3667474

fbshipit-source-id: 02224c6666dfcfdec237bfbbd4714170407a952a

Summary: Because they simply didn't work before.

Reviewed By: yfeldblum

Differential Revision: D3666894

fbshipit-source-id: 7a34073b2bbc43c489ad963c28fac24dcbb187f2

Summary: `RangeEnumerator`s `begin()` and `end()` could return different values, but `Enumerator`s `operator ==` didn't support comparision with different types.

Reviewed By: yfeldblum

Differential Revision: D3662576

fbshipit-source-id: cfd10fffd220c70191ce0ac2ed78edd35daf5538

Summary: There is no reason at all for this to be a macro, so get rid of the macro.

Reviewed By: igorsugak, yfeldblum

Differential Revision: D3666339

fbshipit-source-id: cf131fd4182fe89c5ce0c981edf9bd7fb46158a9

Summary:
Because, if you aren't compiling with `WIN32_LEAN_AND_MEAN`, including `WinSock2.h` will result in `small` being `#define`'d as `char`. The best way to work around the issue is to simply change the name of the member to something else.
It would also have been possible to solve the problem by adding a section to `folly/portability/Windows.h`, but that would have required including that header in `folly/Function.h`, which there really is no reason to do.

Reviewed By: yfeldblum

Differential Revision: D3666417

fbshipit-source-id: 21c0363a4b77bb01e4ec20b2fc625c40729879c3

Summary: The mode parameter to `open` under MSVC is not the same as the mode parameter everywhere else, so we need to do a bit of translation.

Reviewed By: yfeldblum

Differential Revision: D3651218

fbshipit-source-id: 80df1e15f34b8d66533256107d8c9218f757fde2

Summary: This code was relying on the `- 1` overflowing as a 64-bit value, but MSVC (correctly in my opinion) was overflowing this as a 32-bit value, resulting in a segfault when trying to run the bitvector and eliasfano tests on MSVC.

Reviewed By: yfeldblum

Differential Revision: D3652343

fbshipit-source-id: 38a22abfc0d05ab2f070c450eebfa69af07d26af

Summary: We need to make sure RequestContext is unset properly for correct attribution of events to requests in BPF. djwatson, is there a reason not to set RequestContext when running runLoopCallbacks() from EventBase destructor?

Reviewed By: yfeldblum

Differential Revision: D3640289

fbshipit-source-id: bc48e936618adb1a1619de004b8479f58d3b683d

Summary: Closes https://github.com/facebook/folly/pull/429

Reviewed By: mzlee

Differential Revision: D3649806

Pulled By: Orvid

fbshipit-source-id: 77288e0a1aedf15a18f558e18fbc1dc3a56e5fd6

Summary:
Because I fail at typing underscores apparently.
This also switches the shifts over to using `kLockBitMask_` instead, which was already defined for us.

Reviewed By: yfeldblum

Differential Revision: D3652483

fbshipit-source-id: 6bd527beeb90bea8ee7632c0a3bfbbb9e0a7e2e7

Summary:
Fixes make check problem for MallctlHelperTest.

Previous make check output:

MallctlHelperTest.o: In function `MallctlHelperTest_valid_read_Test::TestBody()':
MallctlHelperTest.cpp:(.text+0x25): undefined reference to `testing::internal::AlwaysTrue()'
MallctlHelperTest.cpp:(.text+0x2e): undefined reference to `testing::internal::AlwaysTrue()'
MallctlHelperTest.cpp:(.text+0x51): undefined reference to `testing::Message::Message()'
MallctlHelperTest.cpp:(.text+0x72): undefined reference to `testing::internal::AssertHelper::AssertHelper(testing::TestPartResult::Type, char const*, int, char const*)'
MallctlHelperTest.cpp:(.text+0x85): undefined reference to `testing::internal::AssertHelper::operator=(testing::Message const&) const'
MallctlHelperTest.cpp:(.text+0x91): undefined reference to `testing::internal::AssertHelper::~AssertHelper()'
MallctlHelperTest.cpp:(.text+0xe4): undefined reference to `testing::Message::Message()'
MallctlHelperTest.cpp:(.text+0x111): undefined reference to `testing::inte
Closes https://github.com/facebook/folly/pull/448

Reviewed By: yfeldblum

Differential Revision: D3659427

Pulled By: Orvid

fbshipit-source-id: c1445b881bbebdace4defc02024a5184fd821ed6

Summary: folly AsyncPipeReader takes a callback of type AsyncReader::ReadCallback. Now AsyncReader::ReadCallback class supports IOBuf as a buffer for transfer read bytes. Need to extend AsyncPipeReader class to support IOBuf as well

Reviewed By: yfeldblum

Differential Revision: D3650893

fbshipit-source-id: e2142341c8b8b0b2ef248c1f13a8caba9d50ba67

Summary:
Depends on D3648146

Atomic counter test with:
- Buggy path triggered by an env var
- Auxiliary data
- A global invariant
- A function to be called with shared accesses to update auxiliary data and check the global invariant.

Reviewed By: djwatson

Differential Revision: D3648195

fbshipit-source-id: 18620a887f114abf31ba1261c38287139a1591a7

Summary:
- unused variables
- suppressing "warning: variable length array ‘vec’ is used [-Wvla]"
Closes https://github.com/facebook/folly/pull/443

Reviewed By: djwatson

Differential Revision: D3641928

Pulled By: Orvid

fbshipit-source-id: 0bd58a75f8948f28cc2d232c03bd443734d9657d

Summary:
Support for user-defined auxiliary variables and global invariants.
- Add two fields to DSched:
  -- tls_aux: static FOLLY_TLS std::function<void(uint64_t, bool)>*. User-defined auxiliary function with parameters: count of synchronization steps, and boolean indicator of the success of the current step.
  -- step_: uint64_t. Count of shared accesses that correspond to user synchronization steps (atomic accesses for now).
- Add two static functions to DSched:
  -- void setAux(std::function<void(uint64_t, bool)>*).
  -- void callAux(bool success). Calls the aux function with the step count and the bool success argument.
- Add a version of afterSharedAccess(bool) that takes a bool success parameter and calls callAux(success). This version is used in every atomic operation of DeterministicAtomic.
- Add direct load interface to  DeterministicAtomic for use by auxiliary functions.

Note: This the base of a stacked diff with:
- Test the new capabilities in DeterministicScheduleTest.h
Next steps:
- Use the new capabilities to test dynamic MPMCQueue
Other possible additions:
- Change the implementation of DeterministicMutex to allow inspecting its internal state.
- Test the new capabilities for mutexes and semaphores in DeterministicScheduleTest.h
- Performance optimization: e.g., user-space context switching, using regular variables to implements atomics.

Reviewed By: djwatson

Differential Revision: D3648146

fbshipit-source-id: 4f838ff7cfd41ab71cfdf22bb67def3221948311

Summary: Regenerate README after updating dex_export.php

Reviewed By: fugalh

Differential Revision: D3654216

fbshipit-source-id: aaae04803c480e2ecaf9b3cb8794c8d8f7df560b

Summary:
Currently, getVia(eventbase) will busy wait if no work is scheduled on the event base.

Tweak the DrivableExecutor API a bit to support sleeping/wakeups.
There was already a similar fix for the only other existing DrivableExecutor, the ManualExecutor, in
D2906858.

Reviewed By: andriigrynenko

Differential Revision: D3613954

fbshipit-source-id: 9ff9f2e010040d9886fdf51a665e3afabbff57c0

Summary:
I want to be able to read from an fd into an std::string and this diffs helps
with that.

Reviewed By: yfeldblum

Differential Revision: D3654709

fbshipit-source-id: d48e8001a50f90c66cbe5b4a3b536c7b0074c39d

Summary:
libc++ doesn't implement `std::abs` as template.

```lang=bash
./../folly/fibers/Fiber.h:68:34: error: unexpected type name 'intptr_t': expected
      expression
    const size_t size = std::abs<intptr_t>(
                                 ^
```

Reviewed By: markisaa

Differential Revision: D3645584

fbshipit-source-id: a2d672137f110b975412a94ae4c6d00da0bd0d43

Summary:
[Folly] Remove the glog header include from `Assume.h`.

Better to avoid unnecessary includes.

Reviewed By: Orvid

Differential Revision: D3652651

fbshipit-source-id: 3fa6256e9571539c692b9c50c1c215b31eef394a

Summary: I was off by one in my implementation.

Reviewed By: yfeldblum

Differential Revision: D3651183

fbshipit-source-id: 4d6a6d08c06bce332a00088920bf604a10c942e7

Summary: Just rename the parameter instead, it's not worth it.

Reviewed By: yfeldblum

Differential Revision: D3651065

fbshipit-source-id: ce11c35a7923ab7e10868cedb49c47c0b427fd0c

Summary: A `long` is only 32-bits on MSVC, so this is simply wrong. Shift a `T` left instead.

Reviewed By: yfeldblum

Differential Revision: D3651139

fbshipit-source-id: 3bbfd18ed0c372287c4ec6cbcc543f6f1fcc4139

Summary: Because the check macros attempt to pipe the values to the error stream, but we can't do that with the Windows implementation. Switch to `std::this_thread::get_id()` instead because it's standard and can be piped.

Reviewed By: djwatson

Differential Revision: D3650362

fbshipit-source-id: 8af65448a33949f310abc818d95bac843214b685

Summary: Noticed this while reading the code.

Reviewed By: yfeldblum

Differential Revision: D3648565

fbshipit-source-id: c00940e5ce91fbc7e5cc6c42e35c5deee3e0bf65

Summary:
Initializer list construction can often have conflictingly similar
syntax as uniform initialization.  As a result APIs and classes often either
avoid using `std::initializer_list`s or deprecate construction with
`std::initializer_list`s.  This change provides a tag similar to
`std::piecewise_construct_t` to help out.

Reviewed By: simpkins

Differential Revision: D3617276

fbshipit-source-id: 3c74802f946a22e1a4ee52eca0f89df4a028eb22

Summary:
Test timers where we need to reschedule the wheel timer next tick.

This wasn't tested before, since we were always ticking, and never needed to reschedule.

Differential Revision: D3637103

fbshipit-source-id: cb80e7b790bb6aac68bdb5f60f8aa00caa2e5b69

Summary:
GCC's `__cxa_demangle()` uses on-stack data structures for the parser
state which are linear in the number of components of the symbol. For
extremely long symbols, this can cause a stack overflow.

This diff introduces an arbitrary symbol length limit above which we
just return the mangled name.

Reviewed By: philippv

Differential Revision: D3641115

fbshipit-source-id: ec360bb20ca499fd0eaf3a06c5bbcbd1e936d845

Summary:
Similar to other getters such as getSSLCertSize, but returns a const X509*.
This may be useful to get cert parameters after handshake is complete
(or in error).

Reviewed By: yfeldblum

Differential Revision: D3636598

fbshipit-source-id: 98f0e2987de53d6343541ef0ed588f9ad18390cd

Summary:
Test doesn't match comments.  Remove extranous commented code.

I think there was actually a subtle bug in the test: since 25 doesn't evenly divide in to 6, we could end up farther away than we were expecting.  The same is true of 10/3, but it remains within the threshold.

Reviewed By: yfeldblum

Differential Revision: D3637078

fbshipit-source-id: d9881143c33c9b4f203f839e2e5106183301b530

Summary:
When future callbacks are to be executed by an executor (via `via`)
and the executor does not actually execute the callback function
(for whatever reason), then waiting for the final future (the one
returned by `via`) block forever. In case the callback function
that got passed to the executor gets destroyed without being executed,
the future should be set to a folly::BrokenPromise exception instead
of remaining unset forever.

This diff modifies the reference counting in folly::detail::Core
to make sure the reference held by the callback function is
properly removed not only after the callback gets executed, but
also when the callback is destroyed without having been executed.

Reviewed By: yfeldblum

Differential Revision: D3455931

fbshipit-source-id: debb6f3563384a658d1e0149a4aadbbcb268938c

Summary: Building/testing with ASAN would elicit a heap use-after-free.

Differential Revision: D3639117

fbshipit-source-id: 30b5fa7d3fe1d804c4fba5bada8197a3a05a8333

Summary: takeOwnershipOfPipes should left zero heap memory allocated in folly:Subprocess class instance.

Reviewed By: snarkmaster

Differential Revision: D3638503

fbshipit-source-id: aac7b10bd7399c44868f32c01164f4123892598f

Summary:
Add an unlock() method to Synchronized LockedPtr objects.  This will make it
easier to replace current users of the UNSYNCHRONIZED macro.

Of the handful of places currently using UNSYNCHRONIZED, many of them want to
simply release the lock before logging a message and returning.  However,
UNSYNCHRONIZED is a poor choice for this, since it will re-acquire the lock on
scope exit.  In these situations where the function returns from inside an
UNSYNCHRONIZED block the code unnecessarily re-acquires the lock just to
immediately release it.  The unlock() method will provide a cleaner mechanism
for these call sites to simply drop the lock early before returning.

Reviewed By: yfeldblum

Differential Revision: D3547652

fbshipit-source-id: 4d28fe9f3aad0d7348e918d1a3d6c705bfec242b

Summary:
MSVC gives warnings if you shift a 32-bit value left but then assign it to a 64-bit variable. This just makes it a 64-bit shift instead.
If we really wanted, this doesn't need to be a size_t to begin with, but it already is, so just leave it alone.

Reviewed By: yfeldblum

Differential Revision: D3622935

fbshipit-source-id: 25931e6df644df8a2160aa80fd5de21cd9c06159

Summary:
MAP_POPULATE is not defined on this system.  Instead we will `madvise` the kernel
that we will need it so that it will populate the mapping.

Reviewed By: yfeldblum

Differential Revision: D3584325

fbshipit-source-id: ece52f3d55c475bcd41367f4e9744d6f41001cd5

Summary:
It was using inline assembly in order to get atomic single-bit operations, so add a variant for MSVC that uses intrinsics.
MSVC is also weird in-that it doesn't have a 16-bit variant of these, so use an atomic OR and AND to achieve the required effect.

Reviewed By: yfeldblum

Differential Revision: D3623220

fbshipit-source-id: b4ff985ef2ed7787115f4d20de6f244123410dc8

Summary: That way the mismatch warning can stay as an error.

Reviewed By: yfeldblum

Differential Revision: D3613761

fbshipit-source-id: 6e0ee42c658d95786f578f6500aba113c00d8f77

Summary: While the previous version did compile, it wouldn't actually work at link time.

Reviewed By: meyering

Differential Revision: D3614424

fbshipit-source-id: 578677b65edca720330319594e1163d214e1400d