This unbreaks the build on macOS.

Without the include, the build fails with

llvm/lib/Support/RWMutex.cpp:47:36: error: use of undeclared identifier 'safe_malloc'
   47 |
   static_cast<pthread_rwlock_t*>(safe_malloc(sizeof(pthread_rwlock_t)));
         |                                    ^

Identified with misc-include-cleaner.

Without these explicit includes, removing other headers, who implicitly
include llvm-config.h, may have non-trivial side effects.

This patch extends the `llvm::sys::RWMutex` class to fullfill the
`Lockable` requirement to include attempted locking, by implementing a
`bool try_lock` member function.

As the name suggests, this method will try to acquire to lock in a
non-blocking fashion and release it immediately. If it managed to
acquire the lock, returns `true`, otherwise returns `false`.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

Check for the actual version number for the scenarios where the macOS
version isn't available (__MAC_10_12).

llvm-svn: 369154

In r369018, Benjamin replaced the custom RWMutex implementation with
their C++14 counterpart. Unfortunately, std::shared_timed_mutex is only
available on macOS 10.12 and later. This prevents LLVM from compiling
even on newer versions of the OS when you have an older deployment
target. This patch reintroduced the old RWMutexImpl but guards it by the
macOS availability macro.

Differential revision: https://reviews.llvm.org/D66313

llvm-svn: 369064

This should have the same semantics. We use std::shared_mutex instead on
MSVC and C++17, std::shared_timed_mutex is less efficient than our
custom implementation on Windows, std::shared_mutex should be faster.

llvm-svn: 369018

to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

The RWMutex implementation depends on config.h macros (specifically
HAVE_PTHREAD_H and HAVE_PTHREAD_RWLOCK_INIT), so we need to be
including it and not just llvm-config.h here or we fall back to a much
slower implementation.

llvm-svn: 331487

See r331124 for how I made a list of files missing the include.
I then ran this Python script:

    for f in open('filelist.txt'):
        f = f.strip()
        fl = open(f).readlines()

        found = False
        for i in xrange(len(fl)):
            p = '#include "llvm/'
            if not fl[i].startswith(p):
                continue
            if fl[i][len(p):] > 'Config':
                fl.insert(i, '#include "llvm/Config/llvm-config.h"\n')
                found = True
                break
        if not found:
            print 'not found', f
        else:
            open(f, 'w').write(''.join(fl))

and then looked through everything with `svn diff | diffstat -l | xargs -n 1000 gvim -p`
and tried to fix include ordering and whatnot.

No intended behavior change.

llvm-svn: 331184