fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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875 lines
26 KiB
875 lines
26 KiB
// Copyright (c) 2011-present, 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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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#if defined(OS_LINUX)
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#include <linux/fs.h>
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#endif
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#ifdef OS_LINUX
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#include <sys/statfs.h>
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#include <sys/syscall.h>
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <algorithm>
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// Get nano time includes
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#if defined(OS_LINUX) || defined(OS_FREEBSD)
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#elif defined(__MACH__)
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#include <mach/clock.h>
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#include <mach/mach.h>
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#else
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#include <chrono>
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#endif
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#include <deque>
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#include <set>
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#include "port/port.h"
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#include "rocksdb/slice.h"
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#include "util/coding.h"
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#include "util/io_posix.h"
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#include "util/iostats_context_imp.h"
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#include "util/logging.h"
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#include "util/posix_logger.h"
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#include "util/random.h"
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#include "util/string_util.h"
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#include "util/sync_point.h"
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#include "util/thread_local.h"
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#include "util/thread_status_updater.h"
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#include "util/threadpool_imp.h"
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#if !defined(TMPFS_MAGIC)
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#define TMPFS_MAGIC 0x01021994
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#endif
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#if !defined(XFS_SUPER_MAGIC)
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#define XFS_SUPER_MAGIC 0x58465342
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#endif
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#if !defined(EXT4_SUPER_MAGIC)
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#define EXT4_SUPER_MAGIC 0xEF53
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#endif
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namespace rocksdb {
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namespace {
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ThreadStatusUpdater* CreateThreadStatusUpdater() {
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return new ThreadStatusUpdater();
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}
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// list of pathnames that are locked
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static std::set<std::string> lockedFiles;
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static port::Mutex mutex_lockedFiles;
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static int LockOrUnlock(const std::string& fname, int fd, bool lock) {
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mutex_lockedFiles.Lock();
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if (lock) {
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// If it already exists in the lockedFiles set, then it is already locked,
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// and fail this lock attempt. Otherwise, insert it into lockedFiles.
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// This check is needed because fcntl() does not detect lock conflict
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// if the fcntl is issued by the same thread that earlier acquired
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// this lock.
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if (lockedFiles.insert(fname).second == false) {
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mutex_lockedFiles.Unlock();
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errno = ENOLCK;
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return -1;
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}
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} else {
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// If we are unlocking, then verify that we had locked it earlier,
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// it should already exist in lockedFiles. Remove it from lockedFiles.
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if (lockedFiles.erase(fname) != 1) {
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mutex_lockedFiles.Unlock();
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errno = ENOLCK;
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return -1;
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}
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}
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errno = 0;
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struct flock f;
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memset(&f, 0, sizeof(f));
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f.l_type = (lock ? F_WRLCK : F_UNLCK);
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f.l_whence = SEEK_SET;
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f.l_start = 0;
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f.l_len = 0; // Lock/unlock entire file
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int value = fcntl(fd, F_SETLK, &f);
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if (value == -1 && lock) {
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// if there is an error in locking, then remove the pathname from lockedfiles
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lockedFiles.erase(fname);
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}
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mutex_lockedFiles.Unlock();
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return value;
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}
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class PosixFileLock : public FileLock {
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public:
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int fd_;
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std::string filename;
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};
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class PosixEnv : public Env {
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public:
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PosixEnv();
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virtual ~PosixEnv() {
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for (const auto tid : threads_to_join_) {
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pthread_join(tid, nullptr);
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}
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for (int pool_id = 0; pool_id < Env::Priority::TOTAL; ++pool_id) {
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thread_pools_[pool_id].JoinAllThreads();
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}
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// Delete the thread_status_updater_ only when the current Env is not
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// Env::Default(). This is to avoid the free-after-use error when
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// Env::Default() is destructed while some other child threads are
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// still trying to update thread status.
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if (this != Env::Default()) {
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delete thread_status_updater_;
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}
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}
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void SetFD_CLOEXEC(int fd, const EnvOptions* options) {
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if ((options == nullptr || options->set_fd_cloexec) && fd > 0) {
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fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
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}
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}
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virtual Status NewSequentialFile(const std::string& fname,
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unique_ptr<SequentialFile>* result,
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const EnvOptions& options) override {
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result->reset();
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FILE* f = nullptr;
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do {
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IOSTATS_TIMER_GUARD(open_nanos);
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f = fopen(fname.c_str(), "r");
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} while (f == nullptr && errno == EINTR);
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if (f == nullptr) {
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*result = nullptr;
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return IOError(fname, errno);
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} else if (options.use_direct_reads && !options.use_mmap_writes) {
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#ifdef OS_MACOSX
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int flags = O_RDONLY;
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#else
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int flags = O_RDONLY | O_DIRECT;
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TEST_SYNC_POINT_CALLBACK("NewSequentialFile:O_DIRECT", &flags);
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#endif
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int fd = open(fname.c_str(), flags, 0644);
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if (fd < 0) {
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return IOError(fname, errno);
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}
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#ifdef OS_MACOSX
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if (fcntl(fd, F_NOCACHE, 1) == -1) {
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close(fd);
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return IOError(fname, errno);
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}
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#endif
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std::unique_ptr<PosixDirectIOSequentialFile> file(
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new PosixDirectIOSequentialFile(fname, fd));
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*result = std::move(file);
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return Status::OK();
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} else {
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int fd = fileno(f);
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SetFD_CLOEXEC(fd, &options);
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result->reset(new PosixSequentialFile(fname, f, options));
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return Status::OK();
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}
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}
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virtual Status NewRandomAccessFile(const std::string& fname,
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unique_ptr<RandomAccessFile>* result,
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const EnvOptions& options) override {
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result->reset();
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Status s;
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int fd;
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{
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IOSTATS_TIMER_GUARD(open_nanos);
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fd = open(fname.c_str(), O_RDONLY);
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}
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SetFD_CLOEXEC(fd, &options);
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if (fd < 0) {
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s = IOError(fname, errno);
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} else if (options.use_mmap_reads && sizeof(void*) >= 8) {
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// Use of mmap for random reads has been removed because it
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// kills performance when storage is fast.
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// Use mmap when virtual address-space is plentiful.
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uint64_t size;
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s = GetFileSize(fname, &size);
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if (s.ok()) {
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void* base = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0);
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if (base != MAP_FAILED) {
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result->reset(new PosixMmapReadableFile(fd, fname, base,
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size, options));
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} else {
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s = IOError(fname, errno);
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}
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}
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close(fd);
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} else if (options.use_direct_reads) {
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#ifdef OS_MACOSX
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int flags = O_RDONLY;
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#else
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int flags = O_RDONLY | O_DIRECT;
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TEST_SYNC_POINT_CALLBACK("NewRandomAccessFile:O_DIRECT", &flags);
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#endif
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fd = open(fname.c_str(), flags, 0644);
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if (fd < 0) {
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s = IOError(fname, errno);
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} else {
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std::unique_ptr<PosixDirectIORandomAccessFile> file(
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new PosixDirectIORandomAccessFile(fname, fd));
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*result = std::move(file);
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s = Status::OK();
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#ifdef OS_MACOSX
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if (fcntl(fd, F_NOCACHE, 1) == -1) {
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close(fd);
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s = IOError(fname, errno);
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}
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#endif
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}
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} else {
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result->reset(new PosixRandomAccessFile(fname, fd, options));
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}
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return s;
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}
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virtual Status NewWritableFile(const std::string& fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options) override {
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result->reset();
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Status s;
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int fd = -1;
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do {
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IOSTATS_TIMER_GUARD(open_nanos);
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fd = open(fname.c_str(), O_CREAT | O_RDWR | O_TRUNC, 0644);
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} while (fd < 0 && errno == EINTR);
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if (fd < 0) {
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s = IOError(fname, errno);
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} else {
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SetFD_CLOEXEC(fd, &options);
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if (options.use_mmap_writes) {
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if (!checkedDiskForMmap_) {
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// this will be executed once in the program's lifetime.
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// do not use mmapWrite on non ext-3/xfs/tmpfs systems.
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if (!SupportsFastAllocate(fname)) {
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forceMmapOff = true;
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}
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checkedDiskForMmap_ = true;
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}
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}
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if (options.use_mmap_writes && !forceMmapOff) {
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result->reset(new PosixMmapFile(fname, fd, page_size_, options));
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} else if (options.use_direct_writes) {
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#ifdef OS_MACOSX
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int flags = O_WRONLY | O_APPEND | O_TRUNC | O_CREAT;
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#else
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int flags = O_WRONLY | O_APPEND | O_TRUNC | O_CREAT | O_DIRECT;
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#endif
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TEST_SYNC_POINT_CALLBACK("NewWritableFile:O_DIRECT", &flags);
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fd = open(fname.c_str(), flags, 0644);
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if (fd < 0) {
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s = IOError(fname, errno);
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} else {
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std::unique_ptr<PosixDirectIOWritableFile> file(
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new PosixDirectIOWritableFile(fname, fd));
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*result = std::move(file);
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s = Status::OK();
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#ifdef OS_MACOSX
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if (fcntl(fd, F_NOCACHE, 1) == -1) {
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close(fd);
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s = IOError(fname, errno);
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}
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#endif
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}
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} else {
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// disable mmap writes
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EnvOptions no_mmap_writes_options = options;
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no_mmap_writes_options.use_mmap_writes = false;
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result->reset(new PosixWritableFile(fname, fd, no_mmap_writes_options));
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}
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}
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return s;
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}
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virtual Status ReuseWritableFile(const std::string& fname,
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const std::string& old_fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options) override {
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result->reset();
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Status s;
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int fd = -1;
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do {
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IOSTATS_TIMER_GUARD(open_nanos);
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fd = open(old_fname.c_str(), O_RDWR, 0644);
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} while (fd < 0 && errno == EINTR);
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if (fd < 0) {
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s = IOError(fname, errno);
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} else {
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SetFD_CLOEXEC(fd, &options);
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// rename into place
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if (rename(old_fname.c_str(), fname.c_str()) != 0) {
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Status r = IOError(old_fname, errno);
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close(fd);
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return r;
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}
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if (options.use_mmap_writes) {
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if (!checkedDiskForMmap_) {
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// this will be executed once in the program's lifetime.
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// do not use mmapWrite on non ext-3/xfs/tmpfs systems.
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if (!SupportsFastAllocate(fname)) {
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forceMmapOff = true;
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}
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checkedDiskForMmap_ = true;
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}
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}
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if (options.use_mmap_writes && !forceMmapOff) {
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result->reset(new PosixMmapFile(fname, fd, page_size_, options));
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} else {
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// disable mmap writes
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EnvOptions no_mmap_writes_options = options;
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no_mmap_writes_options.use_mmap_writes = false;
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result->reset(new PosixWritableFile(fname, fd, no_mmap_writes_options));
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}
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}
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return s;
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}
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virtual Status NewRandomRWFile(const std::string& fname,
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unique_ptr<RandomRWFile>* result,
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const EnvOptions& options) override {
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int fd = -1;
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while (fd < 0) {
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IOSTATS_TIMER_GUARD(open_nanos);
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fd = open(fname.c_str(), O_CREAT | O_RDWR, 0644);
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if (fd < 0) {
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// Error while opening the file
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if (errno == EINTR) {
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continue;
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}
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return IOError(fname, errno);
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}
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}
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SetFD_CLOEXEC(fd, &options);
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result->reset(new PosixRandomRWFile(fname, fd, options));
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return Status::OK();
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}
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virtual Status NewDirectory(const std::string& name,
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unique_ptr<Directory>* result) override {
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result->reset();
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int fd;
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{
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IOSTATS_TIMER_GUARD(open_nanos);
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fd = open(name.c_str(), 0);
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}
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if (fd < 0) {
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return IOError(name, errno);
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} else {
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result->reset(new PosixDirectory(fd));
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}
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return Status::OK();
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}
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virtual Status FileExists(const std::string& fname) override {
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int result = access(fname.c_str(), F_OK);
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if (result == 0) {
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return Status::OK();
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}
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switch (errno) {
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case EACCES:
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case ELOOP:
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case ENAMETOOLONG:
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case ENOENT:
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case ENOTDIR:
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return Status::NotFound();
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default:
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assert(result == EIO || result == ENOMEM);
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return Status::IOError("Unexpected error(" + ToString(result) +
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") accessing file `" + fname + "' ");
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}
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}
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virtual Status GetChildren(const std::string& dir,
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std::vector<std::string>* result) override {
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result->clear();
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DIR* d = opendir(dir.c_str());
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if (d == nullptr) {
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return IOError(dir, errno);
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}
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struct dirent* entry;
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while ((entry = readdir(d)) != nullptr) {
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result->push_back(entry->d_name);
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}
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closedir(d);
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return Status::OK();
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}
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virtual Status DeleteFile(const std::string& fname) override {
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Status result;
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if (unlink(fname.c_str()) != 0) {
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result = IOError(fname, errno);
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}
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return result;
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};
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virtual Status CreateDir(const std::string& name) override {
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Status result;
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if (mkdir(name.c_str(), 0755) != 0) {
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result = IOError(name, errno);
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}
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return result;
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};
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virtual Status CreateDirIfMissing(const std::string& name) override {
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Status result;
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if (mkdir(name.c_str(), 0755) != 0) {
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if (errno != EEXIST) {
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result = IOError(name, errno);
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} else if (!DirExists(name)) { // Check that name is actually a
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// directory.
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// Message is taken from mkdir
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result = Status::IOError("`"+name+"' exists but is not a directory");
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}
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}
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return result;
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};
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virtual Status DeleteDir(const std::string& name) override {
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Status result;
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if (rmdir(name.c_str()) != 0) {
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result = IOError(name, errno);
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}
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return result;
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};
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virtual Status GetFileSize(const std::string& fname,
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uint64_t* size) override {
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Status s;
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struct stat sbuf;
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if (stat(fname.c_str(), &sbuf) != 0) {
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*size = 0;
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s = IOError(fname, errno);
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} else {
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*size = sbuf.st_size;
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}
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return s;
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}
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virtual Status GetFileModificationTime(const std::string& fname,
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uint64_t* file_mtime) override {
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struct stat s;
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if (stat(fname.c_str(), &s) !=0) {
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return IOError(fname, errno);
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}
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*file_mtime = static_cast<uint64_t>(s.st_mtime);
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return Status::OK();
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}
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virtual Status RenameFile(const std::string& src,
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const std::string& target) override {
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Status result;
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if (rename(src.c_str(), target.c_str()) != 0) {
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result = IOError(src, errno);
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}
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return result;
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}
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virtual Status LinkFile(const std::string& src,
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const std::string& target) override {
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Status result;
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if (link(src.c_str(), target.c_str()) != 0) {
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if (errno == EXDEV) {
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return Status::NotSupported("No cross FS links allowed");
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}
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result = IOError(src, errno);
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}
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return result;
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}
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virtual Status LockFile(const std::string& fname, FileLock** lock) override {
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*lock = nullptr;
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Status result;
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int fd;
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{
|
|
IOSTATS_TIMER_GUARD(open_nanos);
|
|
fd = open(fname.c_str(), O_RDWR | O_CREAT, 0644);
|
|
}
|
|
if (fd < 0) {
|
|
result = IOError(fname, errno);
|
|
} else if (LockOrUnlock(fname, fd, true) == -1) {
|
|
result = IOError("lock " + fname, errno);
|
|
close(fd);
|
|
} else {
|
|
SetFD_CLOEXEC(fd, nullptr);
|
|
PosixFileLock* my_lock = new PosixFileLock;
|
|
my_lock->fd_ = fd;
|
|
my_lock->filename = fname;
|
|
*lock = my_lock;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual Status UnlockFile(FileLock* lock) override {
|
|
PosixFileLock* my_lock = reinterpret_cast<PosixFileLock*>(lock);
|
|
Status result;
|
|
if (LockOrUnlock(my_lock->filename, my_lock->fd_, false) == -1) {
|
|
result = IOError("unlock", errno);
|
|
}
|
|
close(my_lock->fd_);
|
|
delete my_lock;
|
|
return result;
|
|
}
|
|
|
|
virtual void Schedule(void (*function)(void* arg1), void* arg,
|
|
Priority pri = LOW, void* tag = nullptr,
|
|
void (*unschedFunction)(void* arg) = 0) override;
|
|
|
|
virtual int UnSchedule(void* arg, Priority pri) override;
|
|
|
|
virtual void StartThread(void (*function)(void* arg), void* arg) override;
|
|
|
|
virtual void WaitForJoin() override;
|
|
|
|
virtual unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override;
|
|
|
|
virtual Status GetTestDirectory(std::string* result) override {
|
|
const char* env = getenv("TEST_TMPDIR");
|
|
if (env && env[0] != '\0') {
|
|
*result = env;
|
|
} else {
|
|
char buf[100];
|
|
snprintf(buf, sizeof(buf), "/tmp/rocksdbtest-%d", int(geteuid()));
|
|
*result = buf;
|
|
}
|
|
// Directory may already exist
|
|
CreateDir(*result);
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status GetThreadList(
|
|
std::vector<ThreadStatus>* thread_list) override {
|
|
assert(thread_status_updater_);
|
|
return thread_status_updater_->GetThreadList(thread_list);
|
|
}
|
|
|
|
static uint64_t gettid(pthread_t tid) {
|
|
uint64_t thread_id = 0;
|
|
memcpy(&thread_id, &tid, std::min(sizeof(thread_id), sizeof(tid)));
|
|
return thread_id;
|
|
}
|
|
|
|
static uint64_t gettid() {
|
|
pthread_t tid = pthread_self();
|
|
return gettid(tid);
|
|
}
|
|
|
|
virtual uint64_t GetThreadID() const override {
|
|
return gettid(pthread_self());
|
|
}
|
|
|
|
virtual Status NewLogger(const std::string& fname,
|
|
shared_ptr<Logger>* result) override {
|
|
FILE* f;
|
|
{
|
|
IOSTATS_TIMER_GUARD(open_nanos);
|
|
f = fopen(fname.c_str(), "w");
|
|
}
|
|
if (f == nullptr) {
|
|
result->reset();
|
|
return IOError(fname, errno);
|
|
} else {
|
|
int fd = fileno(f);
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, 4 * 1024);
|
|
#endif
|
|
SetFD_CLOEXEC(fd, nullptr);
|
|
result->reset(new PosixLogger(f, &PosixEnv::gettid, this));
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
virtual uint64_t NowMicros() override {
|
|
struct timeval tv;
|
|
gettimeofday(&tv, nullptr);
|
|
return static_cast<uint64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
|
|
}
|
|
|
|
virtual uint64_t NowNanos() override {
|
|
#if defined(OS_LINUX) || defined(OS_FREEBSD)
|
|
struct timespec ts;
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
|
|
#elif defined(__MACH__)
|
|
clock_serv_t cclock;
|
|
mach_timespec_t ts;
|
|
host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
|
|
clock_get_time(cclock, &ts);
|
|
mach_port_deallocate(mach_task_self(), cclock);
|
|
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
|
|
#else
|
|
return std::chrono::duration_cast<std::chrono::nanoseconds>(
|
|
std::chrono::steady_clock::now().time_since_epoch()).count();
|
|
#endif
|
|
}
|
|
|
|
virtual void SleepForMicroseconds(int micros) override { usleep(micros); }
|
|
|
|
virtual Status GetHostName(char* name, uint64_t len) override {
|
|
int ret = gethostname(name, static_cast<size_t>(len));
|
|
if (ret < 0) {
|
|
if (errno == EFAULT || errno == EINVAL)
|
|
return Status::InvalidArgument(strerror(errno));
|
|
else
|
|
return IOError("GetHostName", errno);
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status GetCurrentTime(int64_t* unix_time) override {
|
|
time_t ret = time(nullptr);
|
|
if (ret == (time_t) -1) {
|
|
return IOError("GetCurrentTime", errno);
|
|
}
|
|
*unix_time = (int64_t) ret;
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status GetAbsolutePath(const std::string& db_path,
|
|
std::string* output_path) override {
|
|
if (db_path.find('/') == 0) {
|
|
*output_path = db_path;
|
|
return Status::OK();
|
|
}
|
|
|
|
char the_path[256];
|
|
char* ret = getcwd(the_path, 256);
|
|
if (ret == nullptr) {
|
|
return Status::IOError(strerror(errno));
|
|
}
|
|
|
|
*output_path = ret;
|
|
return Status::OK();
|
|
}
|
|
|
|
// Allow increasing the number of worker threads.
|
|
virtual void SetBackgroundThreads(int num, Priority pri) override {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
thread_pools_[pri].SetBackgroundThreads(num);
|
|
}
|
|
|
|
// Allow increasing the number of worker threads.
|
|
virtual void IncBackgroundThreadsIfNeeded(int num, Priority pri) override {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
thread_pools_[pri].IncBackgroundThreadsIfNeeded(num);
|
|
}
|
|
|
|
virtual void LowerThreadPoolIOPriority(Priority pool = LOW) override {
|
|
assert(pool >= Priority::LOW && pool <= Priority::HIGH);
|
|
#ifdef OS_LINUX
|
|
thread_pools_[pool].LowerIOPriority();
|
|
#endif
|
|
}
|
|
|
|
virtual std::string TimeToString(uint64_t secondsSince1970) override {
|
|
const time_t seconds = (time_t)secondsSince1970;
|
|
struct tm t;
|
|
int maxsize = 64;
|
|
std::string dummy;
|
|
dummy.reserve(maxsize);
|
|
dummy.resize(maxsize);
|
|
char* p = &dummy[0];
|
|
localtime_r(&seconds, &t);
|
|
snprintf(p, maxsize,
|
|
"%04d/%02d/%02d-%02d:%02d:%02d ",
|
|
t.tm_year + 1900,
|
|
t.tm_mon + 1,
|
|
t.tm_mday,
|
|
t.tm_hour,
|
|
t.tm_min,
|
|
t.tm_sec);
|
|
return dummy;
|
|
}
|
|
|
|
EnvOptions OptimizeForLogWrite(const EnvOptions& env_options,
|
|
const DBOptions& db_options) const override {
|
|
EnvOptions optimized = env_options;
|
|
optimized.use_mmap_writes = false;
|
|
optimized.bytes_per_sync = db_options.wal_bytes_per_sync;
|
|
// TODO(icanadi) it's faster if fallocate_with_keep_size is false, but it
|
|
// breaks TransactionLogIteratorStallAtLastRecord unit test. Fix the unit
|
|
// test and make this false
|
|
optimized.fallocate_with_keep_size = true;
|
|
return optimized;
|
|
}
|
|
|
|
EnvOptions OptimizeForManifestWrite(
|
|
const EnvOptions& env_options) const override {
|
|
EnvOptions optimized = env_options;
|
|
optimized.use_mmap_writes = false;
|
|
optimized.fallocate_with_keep_size = true;
|
|
return optimized;
|
|
}
|
|
|
|
private:
|
|
bool checkedDiskForMmap_;
|
|
bool forceMmapOff; // do we override Env options?
|
|
|
|
|
|
// Returns true iff the named directory exists and is a directory.
|
|
virtual bool DirExists(const std::string& dname) {
|
|
struct stat statbuf;
|
|
if (stat(dname.c_str(), &statbuf) == 0) {
|
|
return S_ISDIR(statbuf.st_mode);
|
|
}
|
|
return false; // stat() failed return false
|
|
}
|
|
|
|
bool SupportsFastAllocate(const std::string& path) {
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
struct statfs s;
|
|
if (statfs(path.c_str(), &s)){
|
|
return false;
|
|
}
|
|
switch (s.f_type) {
|
|
case EXT4_SUPER_MAGIC:
|
|
return true;
|
|
case XFS_SUPER_MAGIC:
|
|
return true;
|
|
case TMPFS_MAGIC:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
size_t page_size_;
|
|
|
|
std::vector<ThreadPoolImpl> thread_pools_;
|
|
pthread_mutex_t mu_;
|
|
std::vector<pthread_t> threads_to_join_;
|
|
};
|
|
|
|
PosixEnv::PosixEnv()
|
|
: checkedDiskForMmap_(false),
|
|
forceMmapOff(false),
|
|
page_size_(getpagesize()),
|
|
thread_pools_(Priority::TOTAL) {
|
|
ThreadPoolImpl::PthreadCall("mutex_init", pthread_mutex_init(&mu_, nullptr));
|
|
for (int pool_id = 0; pool_id < Env::Priority::TOTAL; ++pool_id) {
|
|
thread_pools_[pool_id].SetThreadPriority(
|
|
static_cast<Env::Priority>(pool_id));
|
|
// This allows later initializing the thread-local-env of each thread.
|
|
thread_pools_[pool_id].SetHostEnv(this);
|
|
}
|
|
thread_status_updater_ = CreateThreadStatusUpdater();
|
|
}
|
|
|
|
void PosixEnv::Schedule(void (*function)(void* arg1), void* arg, Priority pri,
|
|
void* tag, void (*unschedFunction)(void* arg)) {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
thread_pools_[pri].Schedule(function, arg, tag, unschedFunction);
|
|
}
|
|
|
|
int PosixEnv::UnSchedule(void* arg, Priority pri) {
|
|
return thread_pools_[pri].UnSchedule(arg);
|
|
}
|
|
|
|
unsigned int PosixEnv::GetThreadPoolQueueLen(Priority pri) const {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
return thread_pools_[pri].GetQueueLen();
|
|
}
|
|
|
|
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 nullptr;
|
|
}
|
|
|
|
void PosixEnv::StartThread(void (*function)(void* arg), void* arg) {
|
|
pthread_t t;
|
|
StartThreadState* state = new StartThreadState;
|
|
state->user_function = function;
|
|
state->arg = arg;
|
|
ThreadPoolImpl::PthreadCall(
|
|
"start thread", pthread_create(&t, nullptr, &StartThreadWrapper, state));
|
|
ThreadPoolImpl::PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
threads_to_join_.push_back(t);
|
|
ThreadPoolImpl::PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
}
|
|
|
|
void PosixEnv::WaitForJoin() {
|
|
for (const auto tid : threads_to_join_) {
|
|
pthread_join(tid, nullptr);
|
|
}
|
|
threads_to_join_.clear();
|
|
}
|
|
|
|
} // namespace
|
|
|
|
std::string Env::GenerateUniqueId() {
|
|
std::string uuid_file = "/proc/sys/kernel/random/uuid";
|
|
|
|
Status s = FileExists(uuid_file);
|
|
if (s.ok()) {
|
|
std::string uuid;
|
|
s = ReadFileToString(this, uuid_file, &uuid);
|
|
if (s.ok()) {
|
|
return uuid;
|
|
}
|
|
}
|
|
// Could not read uuid_file - generate uuid using "nanos-random"
|
|
Random64 r(time(nullptr));
|
|
uint64_t random_uuid_portion =
|
|
r.Uniform(std::numeric_limits<uint64_t>::max());
|
|
uint64_t nanos_uuid_portion = NowNanos();
|
|
char uuid2[200];
|
|
snprintf(uuid2,
|
|
200,
|
|
"%lx-%lx",
|
|
(unsigned long)nanos_uuid_portion,
|
|
(unsigned long)random_uuid_portion);
|
|
return uuid2;
|
|
}
|
|
|
|
//
|
|
// Default Posix Env
|
|
//
|
|
Env* Env::Default() {
|
|
// The following function call initializes the singletons of ThreadLocalPtr
|
|
// right before the static default_env. This guarantees default_env will
|
|
// always being destructed before the ThreadLocalPtr singletons get
|
|
// destructed as C++ guarantees that the destructions of static variables
|
|
// is in the reverse order of their constructions.
|
|
//
|
|
// Since static members are destructed in the reverse order
|
|
// of their construction, having this call here guarantees that
|
|
// the destructor of static PosixEnv will go first, then the
|
|
// the singletons of ThreadLocalPtr.
|
|
ThreadLocalPtr::InitSingletons();
|
|
static PosixEnv default_env;
|
|
return &default_env;
|
|
}
|
|
|
|
} // namespace rocksdb
|
|
|