mirror of
https://github.com/facebook/rocksdb.git
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f9728640f3
Summary: This helps Windows port to format their changes, as discussed. Might have formatted some other codes too becasue last 10 commits include more. Test Plan: Build it. Reviewers: anthony, IslamAbdelRahman, kradhakrishnan, yhchiang, igor Reviewed By: igor Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D41961
156 lines
4 KiB
C++
156 lines
4 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// See port_example.h for documentation for the following types/functions.
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#pragma once
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// size_t printf formatting named in the manner of C99 standard formatting
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// strings such as PRIu64
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// in fact, we could use that one
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#define ROCKSDB_PRIszt "zu"
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#undef PLATFORM_IS_LITTLE_ENDIAN
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#if defined(OS_MACOSX)
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#include <machine/endian.h>
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#if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
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#define PLATFORM_IS_LITTLE_ENDIAN \
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(__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN)
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#endif
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#elif defined(OS_SOLARIS)
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#include <sys/isa_defs.h>
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#ifdef _LITTLE_ENDIAN
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#define PLATFORM_IS_LITTLE_ENDIAN true
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#else
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#define PLATFORM_IS_LITTLE_ENDIAN false
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#endif
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#elif defined(OS_FREEBSD)
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#include <sys/endian.h>
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#include <sys/types.h>
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#define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
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#elif defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
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defined(OS_DRAGONFLYBSD) || defined(OS_ANDROID)
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#include <sys/types.h>
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#include <sys/endian.h>
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#else
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#include <endian.h>
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#endif
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#include <pthread.h>
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#include <stdint.h>
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#include <string>
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#include <string.h>
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#ifndef PLATFORM_IS_LITTLE_ENDIAN
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#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
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#endif
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#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
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defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
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defined(OS_ANDROID)
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// Use fread/fwrite/fflush on platforms without _unlocked variants
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#define fread_unlocked fread
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#define fwrite_unlocked fwrite
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#define fflush_unlocked fflush
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#endif
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#if defined(OS_MACOSX) || defined(OS_FREEBSD) ||\
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defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD)
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// Use fsync() on platforms without fdatasync()
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#define fdatasync fsync
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#endif
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#if defined(OS_ANDROID) && __ANDROID_API__ < 9
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// fdatasync() was only introduced in API level 9 on Android. Use fsync()
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// when targetting older platforms.
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#define fdatasync fsync
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#endif
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#include <limits>
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namespace rocksdb {
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namespace port {
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// For use at db/file_indexer.h kLevelMaxIndex
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const int kMaxInt32 = std::numeric_limits<int32_t>::max();
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const uint64_t kMaxUint64 = std::numeric_limits<uint64_t>::max();
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static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN;
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#undef PLATFORM_IS_LITTLE_ENDIAN
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class CondVar;
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class Mutex {
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public:
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/* implicit */ Mutex(bool adaptive = false);
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~Mutex();
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void Lock();
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void Unlock();
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// this will assert if the mutex is not locked
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// it does NOT verify that mutex is held by a calling thread
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void AssertHeld();
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private:
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friend class CondVar;
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pthread_mutex_t mu_;
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#ifndef NDEBUG
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bool locked_;
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#endif
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// No copying
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Mutex(const Mutex&);
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void operator=(const Mutex&);
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};
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class RWMutex {
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public:
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RWMutex();
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~RWMutex();
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void ReadLock();
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void WriteLock();
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void ReadUnlock();
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void WriteUnlock();
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void AssertHeld() { }
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private:
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pthread_rwlock_t mu_; // the underlying platform mutex
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// No copying allowed
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RWMutex(const RWMutex&);
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void operator=(const RWMutex&);
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};
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class CondVar {
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public:
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explicit CondVar(Mutex* mu);
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~CondVar();
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void Wait();
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// Timed condition wait. Returns true if timeout occurred.
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bool TimedWait(uint64_t abs_time_us);
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void Signal();
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void SignalAll();
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private:
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pthread_cond_t cv_;
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Mutex* mu_;
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};
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typedef pthread_once_t OnceType;
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#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT
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extern void InitOnce(OnceType* once, void (*initializer)());
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#define CACHE_LINE_SIZE 64U
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#define PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
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} // namespace port
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} // namespace rocksdb
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