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rocksdb/env/env_posix.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// 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
#if !defined(OS_WIN)
#include <dirent.h>
#ifndef ROCKSDB_NO_DYNAMIC_EXTENSION
#include <dlfcn.h>
#endif
#include <errno.h>
#include <fcntl.h>
#if defined(ROCKSDB_IOURING_PRESENT)
#include <liburing.h>
#endif
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#if defined(OS_LINUX) || defined(OS_SOLARIS) || defined(OS_ANDROID)
#include <sys/statfs.h>
#endif
#include <sys/statvfs.h>
#include <sys/time.h>
#include <sys/types.h>
#if defined(ROCKSDB_IOURING_PRESENT)
#include <sys/uio.h>
#endif
#include <time.h>
#include <algorithm>
// Get nano time includes
#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_GNU_KFREEBSD)
#elif defined(__MACH__)
#include <Availability.h>
#include <mach/clock.h>
#include <mach/mach.h>
#else
#include <chrono>
#endif
#include <deque>
#include <set>
#include <vector>
#include "env/composite_env_wrapper.h"
#include "env/io_posix.h"
#include "logging/posix_logger.h"
#include "monitoring/iostats_context_imp.h"
#include "monitoring/thread_status_updater.h"
#include "port/port.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "test_util/sync_point.h"
#include "util/coding.h"
#include "util/compression_context_cache.h"
#include "util/random.h"
#include "util/string_util.h"
#include "util/thread_local.h"
#include "util/threadpool_imp.h"
#if !defined(TMPFS_MAGIC)
#define TMPFS_MAGIC 0x01021994
#endif
#if !defined(XFS_SUPER_MAGIC)
#define XFS_SUPER_MAGIC 0x58465342
#endif
#if !defined(EXT4_SUPER_MAGIC)
#define EXT4_SUPER_MAGIC 0xEF53
#endif
namespace ROCKSDB_NAMESPACE {
#if defined(OS_WIN)
static const std::string kSharedLibExt = ".dll";
static const char kPathSeparator = ';';
#else
static const char kPathSeparator = ':';
#if defined(OS_MACOSX)
static const std::string kSharedLibExt = ".dylib";
#else
static const std::string kSharedLibExt = ".so";
#endif
#endif
namespace {
ThreadStatusUpdater* CreateThreadStatusUpdater() {
return new ThreadStatusUpdater();
}
#ifndef ROCKSDB_NO_DYNAMIC_EXTENSION
class PosixDynamicLibrary : public DynamicLibrary {
public:
PosixDynamicLibrary(const std::string& name, void* handle)
: name_(name), handle_(handle) {}
~PosixDynamicLibrary() override { dlclose(handle_); }
Status LoadSymbol(const std::string& sym_name, void** func) override {
assert(nullptr != func);
dlerror(); // Clear any old error
*func = dlsym(handle_, sym_name.c_str());
if (*func != nullptr) {
return Status::OK();
} else {
char* err = dlerror();
return Status::NotFound("Error finding symbol: " + sym_name, err);
}
}
const char* Name() const override { return name_.c_str(); }
private:
std::string name_;
void* handle_;
};
#endif // !ROCKSDB_NO_DYNAMIC_EXTENSION
class PosixEnv : public CompositeEnvWrapper {
public:
// This constructor is for constructing non-default Envs, mainly by
// NewCompositeEnv(). It allows new instances to share the same
// threadpool and other resources as the default Env, while allowing
// a non-default FileSystem implementation
PosixEnv(const PosixEnv* default_env, std::shared_ptr<FileSystem> fs);
~PosixEnv() override {
if (this == Env::Default()) {
for (const auto tid : threads_to_join_) {
pthread_join(tid, nullptr);
}
for (int pool_id = 0; pool_id < Env::Priority::TOTAL; ++pool_id) {
thread_pools_[pool_id].JoinAllThreads();
}
// Do not delete the thread_status_updater_ in order to avoid the
// free after use when Env::Default() is destructed while some other
// child threads are still trying to update thread status. All
// PosixEnv instances use the same thread_status_updater_, so never
// explicitly delete it.
}
}
void SetFD_CLOEXEC(int fd, const EnvOptions* options) {
if ((options == nullptr || options->set_fd_cloexec) && fd > 0) {
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
}
}
#ifndef ROCKSDB_NO_DYNAMIC_EXTENSION
// Loads the named library into the result.
// If the input name is empty, the current executable is loaded
// On *nix systems, a "lib" prefix is added to the name if one is not supplied
// Comparably, the appropriate shared library extension is added to the name
// if not supplied. If search_path is not specified, the shared library will
// be loaded using the default path (LD_LIBRARY_PATH) If search_path is
// specified, the shared library will be searched for in the directories
// provided by the search path
Status LoadLibrary(const std::string& name, const std::string& path,
std::shared_ptr<DynamicLibrary>* result) override {
assert(result != nullptr);
if (name.empty()) {
void* hndl = dlopen(NULL, RTLD_NOW);
if (hndl != nullptr) {
result->reset(new PosixDynamicLibrary(name, hndl));
return Status::OK();
}
} else {
std::string library_name = name;
if (library_name.find(kSharedLibExt) == std::string::npos) {
library_name = library_name + kSharedLibExt;
}
#if !defined(OS_WIN)
if (library_name.find('/') == std::string::npos &&
library_name.compare(0, 3, "lib") != 0) {
library_name = "lib" + library_name;
}
#endif
if (path.empty()) {
void* hndl = dlopen(library_name.c_str(), RTLD_NOW);
if (hndl != nullptr) {
result->reset(new PosixDynamicLibrary(library_name, hndl));
return Status::OK();
}
} else {
std::string local_path;
std::stringstream ss(path);
while (getline(ss, local_path, kPathSeparator)) {
if (!path.empty()) {
std::string full_name = local_path + "/" + library_name;
void* hndl = dlopen(full_name.c_str(), RTLD_NOW);
if (hndl != nullptr) {
result->reset(new PosixDynamicLibrary(full_name, hndl));
return Status::OK();
}
}
}
}
}
return Status::IOError(
IOErrorMsg("Failed to open shared library: xs", name), dlerror());
}
#endif // !ROCKSDB_NO_DYNAMIC_EXTENSION
void Schedule(void (*function)(void* arg1), void* arg, Priority pri = LOW,
void* tag = nullptr,
void (*unschedFunction)(void* arg) = nullptr) override;
int UnSchedule(void* arg, Priority pri) override;
void StartThread(void (*function)(void* arg), void* arg) override;
void WaitForJoin() override;
unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override;
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);
}
uint64_t GetThreadID() const override { return gettid(pthread_self()); }
uint64_t NowMicros() override {
struct timeval tv;
gettimeofday(&tv, nullptr);
return static_cast<uint64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
}
uint64_t NowNanos() override {
#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_GNU_KFREEBSD) || \
defined(OS_AIX)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
#elif defined(OS_SOLARIS)
return gethrtime();
#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
}
uint64_t NowCPUNanos() override {
#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_GNU_KFREEBSD) || \
defined(OS_AIX) || (defined(__MACH__) && defined(__MAC_10_12))
struct timespec ts;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
#endif
return 0;
}
void SleepForMicroseconds(int micros) override { usleep(micros); }
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", name, errno);
}
}
return Status::OK();
}
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();
}
ThreadStatusUpdater* GetThreadStatusUpdater() const override {
return Env::GetThreadStatusUpdater();
}
std::string GenerateUniqueId() override { return Env::GenerateUniqueId(); }
// Allow increasing the number of worker threads.
void SetBackgroundThreads(int num, Priority pri) override {
assert(pri >= Priority::BOTTOM && pri <= Priority::HIGH);
thread_pools_[pri].SetBackgroundThreads(num);
}
int GetBackgroundThreads(Priority pri) override {
assert(pri >= Priority::BOTTOM && pri <= Priority::HIGH);
return thread_pools_[pri].GetBackgroundThreads();
}
Status SetAllowNonOwnerAccess(bool allow_non_owner_access) override {
allow_non_owner_access_ = allow_non_owner_access;
return Status::OK();
}
// Allow increasing the number of worker threads.
void IncBackgroundThreadsIfNeeded(int num, Priority pri) override {
assert(pri >= Priority::BOTTOM && pri <= Priority::HIGH);
thread_pools_[pri].IncBackgroundThreadsIfNeeded(num);
}
void LowerThreadPoolIOPriority(Priority pool) override {
assert(pool >= Priority::BOTTOM && pool <= Priority::HIGH);
#ifdef OS_LINUX
thread_pools_[pool].LowerIOPriority();
#else
(void)pool;
#endif
}
void LowerThreadPoolCPUPriority(Priority pool) override {
assert(pool >= Priority::BOTTOM && pool <= Priority::HIGH);
thread_pools_[pool].LowerCPUPriority(CpuPriority::kLow);
}
Status LowerThreadPoolCPUPriority(Priority pool, CpuPriority pri) override {
assert(pool >= Priority::BOTTOM && pool <= Priority::HIGH);
thread_pools_[pool].LowerCPUPriority(pri);
return Status::OK();
}
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;
}
private:
friend Env* Env::Default();
// Constructs the default Env, a singleton
PosixEnv();
// The below 4 members are only used by the default PosixEnv instance.
// Non-default instances simply maintain references to the backing
// members in te default instance
std::vector<ThreadPoolImpl> thread_pools_storage_;
pthread_mutex_t mu_storage_;
std::vector<pthread_t> threads_to_join_storage_;
bool allow_non_owner_access_storage_;
std::vector<ThreadPoolImpl>& thread_pools_;
pthread_mutex_t& mu_;
std::vector<pthread_t>& threads_to_join_;
// If true, allow non owner read access for db files. Otherwise, non-owner
// has no access to db files.
bool& allow_non_owner_access_;
};
PosixEnv::PosixEnv()
: CompositeEnvWrapper(this, FileSystem::Default()),
thread_pools_storage_(Priority::TOTAL),
allow_non_owner_access_storage_(true),
thread_pools_(thread_pools_storage_),
mu_(mu_storage_),
threads_to_join_(threads_to_join_storage_),
allow_non_owner_access_(allow_non_owner_access_storage_) {
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();
}
PosixEnv::PosixEnv(const PosixEnv* default_env, std::shared_ptr<FileSystem> fs)
: CompositeEnvWrapper(this, fs),
thread_pools_(default_env->thread_pools_),
mu_(default_env->mu_),
threads_to_join_(default_env->threads_to_join_),
allow_non_owner_access_(default_env->allow_non_owner_access_) {
thread_status_updater_ = default_env->thread_status_updater_;
}
void PosixEnv::Schedule(void (*function)(void* arg1), void* arg, Priority pri,
void* tag, void (*unschedFunction)(void* arg)) {
assert(pri >= Priority::BOTTOM && 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::BOTTOM && 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();
CompressionContextCache::InitSingleton();
INIT_SYNC_POINT_SINGLETONS();
static PosixEnv default_env;
return &default_env;
}
std::unique_ptr<Env> NewCompositeEnv(std::shared_ptr<FileSystem> fs) {
PosixEnv* default_env = static_cast<PosixEnv*>(Env::Default());
return std::unique_ptr<Env>(new PosixEnv(default_env, fs));
}
} // namespace ROCKSDB_NAMESPACE
#endif