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-rw-r--r--src/leveldb/util/env_boost.cc591
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diff --git a/src/leveldb/util/env_boost.cc b/src/leveldb/util/env_boost.cc
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+// 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.
+
+#include <deque>
+
+#ifdef LEVELDB_PLATFORM_WINDOWS
+#include <windows.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <io.h>
+#else
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <time.h>
+#include <unistd.h>
+#endif
+#if defined(LEVELDB_PLATFORM_ANDROID)
+#include <sys/stat.h>
+#endif
+#include "leveldb/env.h"
+#include "leveldb/slice.h"
+
+#ifdef LEVELDB_PLATFORM_WINDOWS
+#include "util/win_logger.h"
+#else
+#include "util/posix_logger.h"
+#endif
+#include "port/port.h"
+#include "util/logging.h"
+
+#ifdef __linux
+#include <sys/sysinfo.h>
+#include <linux/unistd.h>
+#endif
+
+#include <fstream>
+
+// Boost includes - see WINDOWS file to see which modules to install
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/filesystem/convenience.hpp>
+#include <boost/thread/once.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/bind.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/interprocess/sync/file_lock.hpp>
+#include <boost/thread/condition_variable.hpp>
+
+namespace leveldb {
+namespace {
+
+// returns the ID of the current process
+static boost::uint32_t current_process_id(void) {
+#ifdef _WIN32
+ return static_cast<boost::uint32_t>(::GetCurrentProcessId());
+#else
+ return static_cast<boost::uint32_t>(::getpid());
+#endif
+}
+
+// returns the ID of the current thread
+static boost::uint32_t current_thread_id(void) {
+#ifdef _WIN32
+ return static_cast<boost::uint32_t>(::GetCurrentThreadId());
+#else
+#ifdef __linux
+ return static_cast<boost::uint32_t>(::syscall(__NR_gettid));
+#else
+ // just return the pid
+ return current_process_id();
+#endif
+#endif
+}
+
+static char global_read_only_buf[0x8000];
+
+class PosixSequentialFile: public SequentialFile {
+ private:
+ std::string filename_;
+ FILE* file_;
+
+ public:
+ PosixSequentialFile(const std::string& fname, FILE* f)
+ : filename_(fname), file_(f) { }
+ virtual ~PosixSequentialFile() { fclose(file_); }
+
+ virtual Status Read(size_t n, Slice* result, char* scratch) {
+ Status s;
+#if defined(BSD) || defined(__MINGW32__)
+ // fread_unlocked doesn't exist on FreeBSD or MingW
+ size_t r = fread(scratch, 1, n, file_);
+#else
+ size_t r = fread_unlocked(scratch, 1, n, file_);
+#endif
+ *result = Slice(scratch, r);
+ if (r < n) {
+ if (feof(file_)) {
+ // We leave status as ok if we hit the end of the file
+ } else {
+ // A partial read with an error: return a non-ok status
+ s = Status::IOError(filename_, strerror(errno));
+ }
+ }
+ return s;
+ }
+
+ virtual Status Skip(uint64_t n) {
+ if (fseek(file_, n, SEEK_CUR)) {
+ return Status::IOError(filename_, strerror(errno));
+ }
+ return Status::OK();
+ }
+};
+
+class PosixRandomAccessFile: public RandomAccessFile {
+ private:
+ std::string filename_;
+ int fd_;
+ mutable boost::mutex mu_;
+
+ public:
+ PosixRandomAccessFile(const std::string& fname, int fd)
+ : filename_(fname), fd_(fd) { }
+ virtual ~PosixRandomAccessFile() { close(fd_); }
+
+ virtual Status Read(uint64_t offset, size_t n, Slice* result,
+ char* scratch) const {
+ Status s;
+#ifdef LEVELDB_PLATFORM_WINDOWS
+ // no pread on Windows so we emulate it with a mutex
+ boost::unique_lock<boost::mutex> lock(mu_);
+
+ if (::_lseeki64(fd_, offset, SEEK_SET) == -1L) {
+ return Status::IOError(filename_, strerror(errno));
+ }
+
+ int r = ::_read(fd_, scratch, n);
+ *result = Slice(scratch, (r < 0) ? 0 : r);
+ lock.unlock();
+#else
+ ssize_t r = pread(fd_, scratch, n, static_cast<off_t>(offset));
+ *result = Slice(scratch, (r < 0) ? 0 : r);
+#endif
+ if (r < 0) {
+ // An error: return a non-ok status
+ s = Status::IOError(filename_, strerror(errno));
+ }
+ return s;
+ }
+};
+
+// We preallocate up to an extra megabyte and use memcpy to append new
+// data to the file. This is safe since we either properly close the
+// file before reading from it, or for log files, the reading code
+// knows enough to skip zero suffixes.
+
+class BoostFile : public WritableFile {
+
+public:
+ explicit BoostFile(std::string path) : path_(path), written_(0) {
+ Open();
+ }
+
+ virtual ~BoostFile() {
+ Close();
+ }
+
+private:
+ void Open() {
+ // we truncate the file as implemented in env_posix
+ file_.open(path_.generic_string().c_str(),
+ std::ios_base::trunc | std::ios_base::out | std::ios_base::binary);
+ written_ = 0;
+ }
+
+public:
+ virtual Status Append(const Slice& data) {
+ Status result;
+ file_.write(data.data(), data.size());
+ if (!file_.good()) {
+ result = Status::IOError(
+ path_.generic_string() + " Append", "cannot write");
+ }
+ return result;
+ }
+
+ virtual Status Close() {
+ Status result;
+
+ try {
+ if (file_.is_open()) {
+ Sync();
+ file_.close();
+ }
+ } catch (const std::exception & e) {
+ result = Status::IOError(path_.generic_string() + " close", e.what());
+ }
+
+ return result;
+ }
+
+ virtual Status Flush() {
+ file_.flush();
+ return Status::OK();
+ }
+
+ virtual Status Sync() {
+ Status result;
+ try {
+ Flush();
+ } catch (const std::exception & e) {
+ result = Status::IOError(path_.string() + " sync", e.what());
+ }
+
+ return result;
+ }
+
+private:
+ boost::filesystem::path path_;
+ boost::uint64_t written_;
+ std::ofstream file_;
+};
+
+
+
+class BoostFileLock : public FileLock {
+ public:
+ boost::interprocess::file_lock fl_;
+};
+
+class PosixEnv : public Env {
+ public:
+ PosixEnv();
+ virtual ~PosixEnv() {
+ fprintf(stderr, "Destroying Env::Default()\n");
+ exit(1);
+ }
+
+ virtual Status NewSequentialFile(const std::string& fname,
+ SequentialFile** result) {
+ FILE* f = fopen(fname.c_str(), "rb");
+ if (f == NULL) {
+ *result = NULL;
+ return Status::IOError(fname, strerror(errno));
+ } else {
+ *result = new PosixSequentialFile(fname, f);
+ return Status::OK();
+ }
+ }
+
+ virtual Status NewRandomAccessFile(const std::string& fname,
+ RandomAccessFile** result) {
+#ifdef LEVELDB_PLATFORM_WINDOWS
+ int fd = _open(fname.c_str(), _O_RDONLY | _O_RANDOM | _O_BINARY);
+#else
+ int fd = open(fname.c_str(), O_RDONLY);
+#endif
+ if (fd < 0) {
+ *result = NULL;
+ return Status::IOError(fname, strerror(errno));
+ }
+ *result = new PosixRandomAccessFile(fname, fd);
+ return Status::OK();
+ }
+
+ virtual Status NewWritableFile(const std::string& fname,
+ WritableFile** result) {
+ Status s;
+ try {
+ // will create a new empty file to write to
+ *result = new BoostFile(fname);
+ }
+ catch (const std::exception & e) {
+ s = Status::IOError(fname, e.what());
+ }
+
+ return s;
+ }
+
+ virtual bool FileExists(const std::string& fname) {
+ return boost::filesystem::exists(fname);
+ }
+
+ virtual Status GetChildren(const std::string& dir,
+ std::vector<std::string>* result) {
+ result->clear();
+
+ boost::system::error_code ec;
+ boost::filesystem::directory_iterator current(dir, ec);
+ if (ec != 0) {
+ return Status::IOError(dir, ec.message());
+ }
+
+ boost::filesystem::directory_iterator end;
+
+ for(; current != end; ++current) {
+ result->push_back(current->path().filename().generic_string());
+ }
+
+ return Status::OK();
+ }
+
+ virtual Status DeleteFile(const std::string& fname) {
+ boost::system::error_code ec;
+
+ boost::filesystem::remove(fname, ec);
+
+ Status result;
+
+ if (ec != 0) {
+ result = Status::IOError(fname, ec.message());
+ }
+
+ return result;
+ }
+
+ virtual Status CreateDir(const std::string& name) {
+ Status result;
+
+ if (boost::filesystem::exists(name) &&
+ boost::filesystem::is_directory(name)) {
+ return result;
+ }
+
+ boost::system::error_code ec;
+
+ if (!boost::filesystem::create_directories(name, ec)) {
+ result = Status::IOError(name, ec.message());
+ }
+
+ return result;
+ };
+
+ virtual Status DeleteDir(const std::string& name) {
+ Status result;
+
+ boost::system::error_code ec;
+ if (!boost::filesystem::remove_all(name, ec)) {
+ result = Status::IOError(name, ec.message());
+ }
+
+ return result;
+ };
+
+ virtual Status GetFileSize(const std::string& fname, uint64_t* size) {
+ boost::system::error_code ec;
+
+ Status result;
+
+ *size = static_cast<uint64_t>(boost::filesystem::file_size(fname, ec));
+ if (ec != 0) {
+ *size = 0;
+ result = Status::IOError(fname, ec.message());
+ }
+
+ return result;
+ }
+
+ virtual Status RenameFile(const std::string& src, const std::string& target) {
+ boost::system::error_code ec;
+
+ boost::filesystem::rename(src, target, ec);
+
+ Status result;
+
+ if (ec != 0) {
+ result = Status::IOError(src, ec.message());
+ }
+
+ return result;
+ }
+
+ virtual Status LockFile(const std::string& fname, FileLock** lock) {
+ *lock = NULL;
+
+ Status result;
+
+ try {
+ if (!boost::filesystem::exists(fname)) {
+ std::ofstream of(fname.c_str(), std::ios_base::trunc | std::ios_base::out);
+ }
+
+ assert(boost::filesystem::exists(fname));
+
+ boost::interprocess::file_lock fl(fname.c_str());
+ BoostFileLock * my_lock = new BoostFileLock();
+ my_lock->fl_ = std::move(fl);
+ if (!my_lock->fl_.try_lock()) {
+ return Status::IOError("database already in use: could not acquire exclusive lock");
+ }
+ *lock = my_lock;
+ } catch (const std::exception & e) {
+ result = Status::IOError("lock " + fname, e.what());
+ }
+
+ return result;
+ }
+
+ virtual Status UnlockFile(FileLock* lock) {
+
+ Status result;
+
+ try {
+ BoostFileLock * my_lock = static_cast<BoostFileLock *>(lock);
+ my_lock->fl_.unlock();
+ delete my_lock;
+ } catch (const std::exception & e) {
+ result = Status::IOError("unlock", e.what());
+ }
+
+ return result;
+ }
+
+ virtual void Schedule(void (*function)(void*), void* arg);
+
+ virtual void StartThread(void (*function)(void* arg), void* arg);
+
+ virtual Status GetTestDirectory(std::string* result) {
+ boost::system::error_code ec;
+ boost::filesystem::path temp_dir =
+ boost::filesystem::temp_directory_path(ec);
+ if (ec != 0) {
+ temp_dir = "tmp";
+ }
+
+ temp_dir /= "leveldb_tests";
+ temp_dir /= boost::lexical_cast<std::string>(current_process_id());
+
+ // Directory may already exist
+ CreateDir(temp_dir.generic_string());
+
+ *result = temp_dir.generic_string();
+
+ return Status::OK();
+ }
+
+#ifndef LEVELDB_PLATFORM_WINDOWS
+ static uint64_t gettid() {
+ pthread_t tid = pthread_self();
+ uint64_t thread_id = 0;
+ memcpy(&thread_id, &tid, std::min(sizeof(thread_id), sizeof(tid)));
+ return thread_id;
+ }
+#endif
+
+ virtual Status NewLogger(const std::string& fname, Logger** result) {
+ FILE* f = fopen(fname.c_str(), "wt");
+ if (f == NULL) {
+ *result = NULL;
+ return Status::IOError(fname, strerror(errno));
+ } else {
+#ifdef LEVELDB_PLATFORM_WINDOWS
+ *result = new WinLogger(f);
+#else
+ *result = new PosixLogger(f, &PosixEnv::gettid);
+#endif
+ return Status::OK();
+ }
+ }
+
+ virtual uint64_t NowMicros() {
+ return static_cast<uint64_t>(
+ boost::posix_time::microsec_clock::universal_time()
+ .time_of_day().total_microseconds());
+ }
+
+ virtual void SleepForMicroseconds(int micros) {
+ boost::this_thread::sleep(boost::posix_time::microseconds(micros));
+ }
+
+ private:
+ void PthreadCall(const char* label, int result) {
+ if (result != 0) {
+ fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
+ exit(1);
+ }
+ }
+
+ // BGThread() is the body of the background thread
+ void BGThread();
+
+ static void* BGThreadWrapper(void* arg) {
+ reinterpret_cast<PosixEnv*>(arg)->BGThread();
+ return NULL;
+ }
+
+ boost::mutex mu_;
+ boost::condition_variable bgsignal_;
+ boost::scoped_ptr<boost::thread> bgthread_;
+
+ // Entry per Schedule() call
+ struct BGItem { void* arg; void (*function)(void*); };
+ typedef std::deque<BGItem> BGQueue;
+ BGQueue queue_;
+};
+
+PosixEnv::PosixEnv() { }
+
+void PosixEnv::Schedule(void (*function)(void*), void* arg) {
+ boost::unique_lock<boost::mutex> lock(mu_);
+
+ // Start background thread if necessary
+ if (!bgthread_) {
+ bgthread_.reset(
+ new boost::thread(boost::bind(&PosixEnv::BGThreadWrapper, this)));
+ }
+
+ // Add to priority queue
+ queue_.push_back(BGItem());
+ queue_.back().function = function;
+ queue_.back().arg = arg;
+
+ lock.unlock();
+
+ bgsignal_.notify_one();
+
+}
+
+void PosixEnv::BGThread() {
+ while (true) {
+ // Wait until there is an item that is ready to run
+ boost::unique_lock<boost::mutex> lock(mu_);
+
+ while (queue_.empty()) {
+ bgsignal_.wait(lock);
+ }
+
+ void (*function)(void*) = queue_.front().function;
+ void* arg = queue_.front().arg;
+ queue_.pop_front();
+
+ lock.unlock();
+ (*function)(arg);
+ }
+}
+
+namespace {
+struct StartThreadState {
+ void (*user_function)(void*);
+ void* arg;
+};
+}
+
+static void* StartThreadWrapper(void* arg) {
+ StartThreadState* state = reinterpret_cast<StartThreadState*>(arg);
+ state->user_function(state->arg);
+ delete state;
+ return NULL;
+}
+
+void PosixEnv::StartThread(void (*function)(void* arg), void* arg) {
+ StartThreadState* state = new StartThreadState;
+ state->user_function = function;
+ state->arg = arg;
+
+ boost::thread t(boost::bind(&StartThreadWrapper, state));
+}
+
+}
+
+static boost::once_flag once = BOOST_ONCE_INIT;
+static Env* default_env;
+static void InitDefaultEnv() {
+ ::memset(global_read_only_buf, 0, sizeof(global_read_only_buf));
+ default_env = new PosixEnv;
+}
+
+Env* Env::Default() {
+ boost::call_once(once, InitDefaultEnv);
+
+ return default_env;
+}
+
+}