Summary:
preallocate once and for all, so that we
are really malloc efficient in toAppendDelim

Test Plan: unit tests

Reviewed By: marcelo.juchem@fb.com

FB internal diff: D1496310

Tasks: 4886092

Summary:
The Optional test relied on std::string clearing its data when
it is the source of a move. This does not happen for in-situ fbstrings,
so the test breaks in the -fb platform. The solution: wrap the string in
a class that explicitly invalidates its data upon a move.

Test Plan:
fbconfig --platform-all=gcc-4.8.1-glibc-2.17-fb -r folly
fbmake runtests
fbconfig -r folly
fbmake runtests

Reviewed By: tudorb@fb.com

Subscribers: sdwilsh

FB internal diff: D1506840

Tasks: 4943996

Test Plan: Unit test

Reviewed By: andrei.alexandrescu@fb.com

Subscribers: shilin

FB internal diff: D1497250

Summary: It should remove one malloc as per the task.

Test Plan: `fbconfig folly/wangle && fbmake runtests` Also, `--clang`.

Reviewed By: davejwatson@fb.com

Subscribers: fugalh

FB internal diff: D1498331

Tasks: 4913277

Summary:
Common pattern: a function returns Optional<X>, indicating whether some X was
present or not; you want a default value if the X was not present. Requires
that X is copiable.

Test Plan: optional_test (test added)

Reviewed By: tjackson@fb.com

Subscribers: aalexandre, fjargsto, jhj, ntv, lesha, kma

FB internal diff: D1502397

Summary:
The test runner for folly seems to run from folly/test rather than the base fbcode directory. This hack ensures that we find the necessary test files in either case.

This fixes the breakage introduced by {D1493963}.

Test Plan: fbconfig -r folly && fbmake runtests

Reviewed By: davejwatson@fb.com

Subscribers: dipanshu

FB internal diff: D1502161

Summary:
Currently folly::Synchronized can't be used with non-default
constructible types because copy and move constructors require
creation of datum_ before it's assignment.
To fix this we can initialize them in initializer-list and
handle guard creation using helper constructor

Test Plan:
fbconfig -r folly && fbmake runtests
Fixes compilation error: Synchronized started working for non-default
constructible types in my project(rfe).

Reviewed By: yuri@fb.com

Subscribers: dhruvbird

FB internal diff: D1502110

Summary: Added support for clang in Checksum.cpp preprocessor statements.

Test Plan: The right code path is chosen using both gcc and clang now.

Reviewed By: brianp@fb.com

Subscribers: mathieubaudet, sroy, satadru

FB internal diff: D1502289

Summary:
Comments are a useful extension to JSON, especially for configuration files.

Facebook: twagent would previously barf on JSON files that contained '//' in their strings, and this commit allows twagent to strip comments properly. Fixes T4686066.

Test Plan: fbconfig common/json mcrouter/lib/config tupperware/agent && fbmake runtests

Reviewed By: aravindn@fb.com

Subscribers: anarayanan, pavlo, stepan, dipanshu, alikhtarov

FB internal diff: D1493963

Tasks: 4686066

Summary:
It eventually tries to read from /sys/devices which is not portable.
Let's just fall back to sysconf/CacheLocality::uniform.

This fixes a runtime crash on OSX, but CYGWIN/BSD were probably also
affected.
Closes #80

@override-unit-failures

Test Plan: author tested, contbuild, flib

Reviewed By: joelm@fb.com

FB internal diff: D1498567

Summary:
This is a known issue on Darwin

@override-unit-failures

Test Plan: folly/detail/IPAddress.h compiles on a mac

Reviewed By: joelm@fb.com

FB internal diff: D1499795

Summary:
Fixes the OSX build.
Closes #79

Test Plan: author tested, contbuild, flib

Reviewed By: joelm@fb.com

FB internal diff: D1498545

Summary: Less generic than I hoped for. Naming is terrible.

Test Plan:
`fbconfig -r tao/client && fbmake runtests` -- I figured if it compiles
it works. Also did a `--sanitize=address` build just in case.

Reviewed By: hans@fb.com

Subscribers: fugalh, zhuohuang, anca

FB internal diff: D1470483

Summary:
D1494614 migrated us to gtest 1.7 which broke multiple builds (with
"error: 'tuple' is already declared in this scope" coming from
https://code.google.com/p/googletest/source/detail?spec=svn621&r=621).
This diff makes folly compatible with both versions of gtest, and the rest
of fbcode is now compatible with gtest 1.7.

Test Plan: fbconfig -r folly unicorn/diskindex4 && fbmake opt -j32

Reviewed By: jiayan@fb.com

Subscribers: fbcode-common-diffs@, chaoyc, search-fbcode-diffs@, sdoroshenko, cold-storage-diffs@, unicorn-diffs@

FB internal diff: D1497389

Tasks: 4909974, 4910547, 4910567, 4909983

Summary:
adding @agartrell's implementation of EvictingCacheMap to folly. Its a general purpose
cache with LRU eviction. It maintains a doubly linked list threaded throught a hash map using
boost::intrusive. set, get and delete are all constant time operations.  It is not thread safe.

Configurability: It allows callers to specify a hasher for the keys, has callbacks for eviction
events and the number of evictions on reaching a capacity limit is configurable. resizing for
a higher capacity though could be suboptimal since index is not resized accordingly and you could
end up with a bad load factor.

Test Plan: unit tests

Reviewed By: tulloch@fb.com, njormrod@fb.com

Subscribers: tulloch, chrisbray, mhx, doug, agartrell

FB internal diff: D1483789

Summary:
OS X doesn't support this -- it requires support at the linker
level which OS X just doesn't have. Reasonable OS X compilers will yell
about it, but even the ones that don't are just silently dropping it
on the floor.

So I'm not sure what //we// can do other than just silently dropping
this on the floor too and hoping that everything works.

Test Plan:
HHVM build on OS X gets ever so slightly further (runs into
other issues). HHVM build in fbcode still seems to build folly okay
(didn't wait for it to finish fully).

Fixes https://github.com/facebook/folly/issues/78

Reviewed By: tudorb@fb.com

FB internal diff: D1487191

Blame Revision: rFBCODE502be7cb0fda306ddc33b9c5ad7a53b0cfbdc893

Summary:
* Spend some extra time in getNumBuckets() in order to save
space: 8 bytes per object on 64-bit platforms.

Test Plan: Ran the unit tests

Reviewed By: simpkins@fb.com

Subscribers: ruibalp

FB internal diff: D1488345

Test Plan: n.a

Reviewed By: philipp@fb.com

FB internal diff: D1487919

Summary:
This diff changes LOG_EVERY_MS so that if the specified
interval is zero or negative, no clock call is made and LOG(severity) is
always called.  milli_interval is copied into a temporary to avoid
double-evaluation.

Test Plan:
1. unit tests
2. new unit test

Reviewed By: lesha@fb.com

FB internal diff: D1469366

Tasks: 4813858

Summary:
clang would re-use the same memory location for recreated
objects, so instead of checking pointers, we can use a serial number.

Test Plan: runtests with fbconfig --clang

Reviewed By: lins@fb.com

Subscribers: mathieubaudet, lins, anca

FB internal diff: D1485907

Summary: Save space and avoid extra mallocs

Test Plan: fbconfig -r smc/zeus; fbmake runtests

Reviewed By: henryf@fb.com

Subscribers: zeus-diffs@

FB internal diff: D1476688

Tasks: 4832974

Summary:
This diff adds timed_wait that allows waiting on the Baton
with a timeout. The diff also adds try_wait which doesn't
block the thread at all.

Test Plan:
-- added new unit tests
-- ran all folly tests

Reviewed By: ngbronson@fb.com

Subscribers: bwatling

FB internal diff: D1468909

Tasks: 4679428

Summary:
Renamed `goTo` to `jump`, introduced `jumpTo`.

FBCode: Updated CSS tree benchmark to compare with EF-based search that
is using `jumpTo` (P14517259).

Test Plan: fbconfig -r folly/experimental/test:eliasfano_test && fbmake runtests_opt -j32

@override-unit-failures

Reviewed By: lucian@fb.com

Subscribers: fbcode-common-diffs@

FB internal diff: D1474431

Tasks: 4536072

Summary:
Currently IPAddress::toFullyQualified() is fairly slow for IPv6.

Change here implements more lightweight in_addr/in6_addr to string functions.

I also added a benchmark for comparison with inet_ntop.

This makes IPAddressV6::toFullyQualified() significantly faster than inet_ntop, and makes IPAddressV4::str() ~20ns faster than previous impementation (previously ~80ns).

Previous benchmark:
============================================================================
folly/test/IPAddressBenchmark.cpp               relative  time/iter  iters/s
============================================================================
ipv4_to_string_inet_ntop                                   238.91ns    4.19M
ipv4_to_fully_qualified                          289.96%    82.39ns   12.14M
----------------------------------------------------------------------------
ipv6_to_string_inet_ntop                                   780.72ns    1.28M
ipv6_to_fully_qualified                           51.11%     1.53us  654.59K
============================================================================

With this change:
============================================================================
folly/test/IPAddressBenchmark.cpp               relative  time/iter  iters/s
============================================================================
ipv4_to_string_inet_ntop                                   238.06ns    4.20M
ipv4_to_fully_qualified                          364.76%    65.26ns   15.32M
----------------------------------------------------------------------------
ipv6_to_string_inet_ntop                                   770.74ns    1.30M
ipv6_to_fully_qualified                          791.63%    97.36ns   10.27M
============================================================================

Test Plan:
fbconfig folly/test:network_address_test folly/test:network_address_benchmark
fbmake runtests_opt

Reviewed By: simpkins@fb.com

Subscribers: ps, bmatheny

FB internal diff: D1477925

Tasks: 4832974

Summary:
* folly/test/AtomicHashArrayTest.cpp (MmapAllocator):
Upon failure, mmap returns MAP_FAILED, not NULL.

Test Plan:
fbconfig -r folly/test:atomic_hash_array_test && fbmake runtests

Reviewed By: mwang@fb.com

FB internal diff: D1481080

Tasks: 4846893

Test Plan: fbconfig -r folly/experimental/test:eliasfano_test && fbmake opt -j32

Reviewed By: lucian@fb.com

Subscribers: chaoyc, search-fbcode-diffs@, unicorn-diffs@

FB internal diff: D1474625

Tasks: 4828866

Summary:
* folly/IndexedMemPool.h (IndexedMemPool): Correct the test for
failed mmap.  Upon failure, it returns MAP_FAILED, not nullptr.

Test Plan:
fbconfig -r folly/test:indexed_mem_pool_test && fbmake runtests

Reviewed By: ngbronson@fb.com

FB internal diff: D1480389

Tasks: 4846893
@override-unit-failures

Summary: Adds a shrink_to_fit() method to sorted vector types.

Test Plan: unit test

Reviewed By: mshneer@fb.com

FB internal diff: D1477864

Summary:
Consider this use case:
thread 1:
make an evb
create and start thread 2
do some work
evb->terminateLoopSoon()
join thread 2 with a timeout
thread 2:
do some initialization
evb->loop()
Normally, this all works fine.  However, if the work thread 1 has to do is sufficiently small, and no external input occurs (one of the thing the evb is doing is listening on a socket), then sometimes, terminateLoopSoon() happens before loop() is called (or at least, before loopThread_.store() happens). isRunning() in terminateLoopSoon() is false, and so stop_ is never set, and event_base_loopbreak() is never called. The join times out, and thread 2 is still running.  Removing the isRunning() check gives the desired behavior.

Test Plan:
In my ad hoc tests, this fix caused my threads to exit when
I wanted them to exit in a situation like the one above.

Reviewed By: andrewcox@fb.com

FB internal diff: D1455885

Tasks: 2057547

Summary:
I don't know why this was in the cpp but seems pretty safe to move it to the .h
There are a few files that directly include json.cpp to get around this: https://fburl.com/30544625.
I need it for something else and if you dont see a problem I want to move it.

Test Plan: unittests

Reviewed By: pgriess@fb.com

Subscribers: simpkins, doug

FB internal diff: D1471958

Tasks: 3623725

Summary: Random lookup support.

Test Plan: fbconfig -r folly/experimental/test:eliasfano_test && fbmake runtests_opt -j32

@override-unit-failures

Reviewed By: soren@fb.com

FB internal diff: D1473244

Tasks: 4536072

Test Plan: Tested end-to-end with D1342452

Reviewed By: mshneer@fb.com

Subscribers: alandau, bmatheny

FB internal diff: D1470814

Tasks: 2682011

Summary: added recently, needs to be installed

Test Plan: watch fbthrift contbuild

Reviewed By: noamz@fb.com

Subscribers: doug

FB internal diff: D1469760

Blame Revision: D1453095

Summary:
It would be nice to be able to create a Later with pre-loaded
exception.

Test Plan: Unit test

Reviewed By: hans@fb.com

Subscribers: fugalh

FB internal diff: D1462810

Summary: This doesn't have many thrift dependencies and I need it for another async class I'm adding to folly.

Test Plan: unit tests

Reviewed By: alandau@fb.com

Subscribers: doug, mcduff, marccelani, mshneer, alandau, bmatheny

FB internal diff: D1453095

Summary: Checks if IPAddress has not been initialized.

Test Plan: unit test

Reviewed By: tudorb@fb.com

Subscribers: tudorb

FB internal diff: D1459525