| // Copyright (c) 2011 The LevelDB Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. See the AUTHORS file for names of contributors. |
| // |
| // See port_example.h for documentation for the following types/functions. |
| |
| #ifndef STORAGE_LEVELDB_PORT_PORT_POSIX_H_ |
| #define STORAGE_LEVELDB_PORT_PORT_POSIX_H_ |
| |
| // port/port_config.h availability is automatically detected via __has_include |
| // in newer compilers. If LEVELDB_HAS_PORT_CONFIG_H is defined, it overrides the |
| // configuration detection. |
| #if defined(LEVELDB_HAS_PORT_CONFIG_H) |
| |
| #if LEVELDB_HAS_PORT_CONFIG_H |
| #include "port/port_config.h" |
| #endif // LEVELDB_HAS_PORT_CONFIG_H |
| |
| #elif defined(__has_include) |
| |
| #if __has_include("port/port_config.h") |
| #include "port/port_config.h" |
| #endif // __has_include("port/port_config.h") |
| |
| #endif // defined(LEVELDB_HAS_PORT_CONFIG_H) |
| |
| #include <pthread.h> |
| #if HAVE_CRC32C |
| #include <crc32c/crc32c.h> |
| #endif // HAVE_CRC32C |
| #if HAVE_SNAPPY |
| #include <snappy.h> |
| #endif // HAVE_SNAPPY |
| #include <stdint.h> |
| #include <string> |
| #include "port/atomic_pointer.h" |
| #include "port/thread_annotations.h" |
| |
| #if !HAVE_FDATASYNC |
| #define fdatasync fsync |
| #endif // !HAVE_FDATASYNC |
| |
| namespace leveldb { |
| namespace port { |
| |
| static const bool kLittleEndian = !LEVELDB_IS_BIG_ENDIAN; |
| |
| class CondVar; |
| |
| class LOCKABLE Mutex { |
| public: |
| Mutex(); |
| ~Mutex(); |
| |
| void Lock() EXCLUSIVE_LOCK_FUNCTION(); |
| void Unlock() UNLOCK_FUNCTION(); |
| void AssertHeld() ASSERT_EXCLUSIVE_LOCK() { } |
| |
| private: |
| friend class CondVar; |
| pthread_mutex_t mu_; |
| |
| // No copying |
| Mutex(const Mutex&); |
| void operator=(const Mutex&); |
| }; |
| |
| class CondVar { |
| public: |
| explicit CondVar(Mutex* mu); |
| ~CondVar(); |
| void Wait(); |
| void Signal(); |
| void SignalAll(); |
| private: |
| pthread_cond_t cv_; |
| Mutex* mu_; |
| }; |
| |
| typedef pthread_once_t OnceType; |
| #define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT |
| void InitOnce(OnceType* once, void (*initializer)()); |
| |
| inline bool Snappy_Compress(const char* input, size_t length, |
| ::std::string* output) { |
| #if HAVE_SNAPPY |
| output->resize(snappy::MaxCompressedLength(length)); |
| size_t outlen; |
| snappy::RawCompress(input, length, &(*output)[0], &outlen); |
| output->resize(outlen); |
| return true; |
| #endif // HAVE_SNAPPY |
| |
| return false; |
| } |
| |
| inline bool Snappy_GetUncompressedLength(const char* input, size_t length, |
| size_t* result) { |
| #if HAVE_SNAPPY |
| return snappy::GetUncompressedLength(input, length, result); |
| #else |
| return false; |
| #endif // HAVE_SNAPPY |
| } |
| |
| inline bool Snappy_Uncompress(const char* input, size_t length, |
| char* output) { |
| #if HAVE_SNAPPY |
| return snappy::RawUncompress(input, length, output); |
| #else |
| return false; |
| #endif // HAVE_SNAPPY |
| } |
| |
| inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) { |
| return false; |
| } |
| |
| inline uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size) { |
| #if HAVE_CRC32C |
| return ::crc32c::Extend(crc, reinterpret_cast<const uint8_t*>(buf), size); |
| #else |
| return 0; |
| #endif // HAVE_CRC32C |
| } |
| |
| } // namespace port |
| } // namespace leveldb |
| |
| #endif // STORAGE_LEVELDB_PORT_PORT_POSIX_H_ |