From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/rocksdb/port/port_posix.cc | 300 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 300 insertions(+) create mode 100644 src/rocksdb/port/port_posix.cc (limited to 'src/rocksdb/port/port_posix.cc') diff --git a/src/rocksdb/port/port_posix.cc b/src/rocksdb/port/port_posix.cc new file mode 100644 index 000000000..3872293b8 --- /dev/null +++ b/src/rocksdb/port/port_posix.cc @@ -0,0 +1,300 @@ +// 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 "port/port_posix.h" + +#include +#if defined(__i386__) || defined(__x86_64__) +#include +#endif +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "util/string_util.h" + +namespace ROCKSDB_NAMESPACE { + +// We want to give users opportunity to default all the mutexes to adaptive if +// not specified otherwise. This enables a quick way to conduct various +// performance related experiements. +// +// NB! Support for adaptive mutexes is turned on by definining +// ROCKSDB_PTHREAD_ADAPTIVE_MUTEX during the compilation. If you use RocksDB +// build environment then this happens automatically; otherwise it's up to the +// consumer to define the identifier. +#ifdef ROCKSDB_DEFAULT_TO_ADAPTIVE_MUTEX +extern const bool kDefaultToAdaptiveMutex = true; +#else +extern const bool kDefaultToAdaptiveMutex = false; +#endif + +namespace port { + +static int PthreadCall(const char* label, int result) { + if (result != 0 && result != ETIMEDOUT && result != EBUSY) { + fprintf(stderr, "pthread %s: %s\n", label, errnoStr(result).c_str()); + abort(); + } + return result; +} + +Mutex::Mutex(bool adaptive) { + (void)adaptive; +#ifdef ROCKSDB_PTHREAD_ADAPTIVE_MUTEX + if (!adaptive) { + PthreadCall("init mutex", pthread_mutex_init(&mu_, nullptr)); + } else { + pthread_mutexattr_t mutex_attr; + PthreadCall("init mutex attr", pthread_mutexattr_init(&mutex_attr)); + PthreadCall("set mutex attr", pthread_mutexattr_settype( + &mutex_attr, PTHREAD_MUTEX_ADAPTIVE_NP)); + PthreadCall("init mutex", pthread_mutex_init(&mu_, &mutex_attr)); + PthreadCall("destroy mutex attr", pthread_mutexattr_destroy(&mutex_attr)); + } +#else + PthreadCall("init mutex", pthread_mutex_init(&mu_, nullptr)); +#endif // ROCKSDB_PTHREAD_ADAPTIVE_MUTEX +} + +Mutex::~Mutex() { PthreadCall("destroy mutex", pthread_mutex_destroy(&mu_)); } + +void Mutex::Lock() { + PthreadCall("lock", pthread_mutex_lock(&mu_)); +#ifndef NDEBUG + locked_ = true; +#endif +} + +void Mutex::Unlock() { +#ifndef NDEBUG + locked_ = false; +#endif + PthreadCall("unlock", pthread_mutex_unlock(&mu_)); +} + +bool Mutex::TryLock() { + bool ret = PthreadCall("trylock", pthread_mutex_trylock(&mu_)) == 0; +#ifndef NDEBUG + if (ret) { + locked_ = true; + } +#endif + return ret; +} + +void Mutex::AssertHeld() { +#ifndef NDEBUG + assert(locked_); +#endif +} + +CondVar::CondVar(Mutex* mu) : mu_(mu) { + PthreadCall("init cv", pthread_cond_init(&cv_, nullptr)); +} + +CondVar::~CondVar() { PthreadCall("destroy cv", pthread_cond_destroy(&cv_)); } + +void CondVar::Wait() { +#ifndef NDEBUG + mu_->locked_ = false; +#endif + PthreadCall("wait", pthread_cond_wait(&cv_, &mu_->mu_)); +#ifndef NDEBUG + mu_->locked_ = true; +#endif +} + +bool CondVar::TimedWait(uint64_t abs_time_us) { + struct timespec ts; + ts.tv_sec = static_cast(abs_time_us / 1000000); + ts.tv_nsec = static_cast((abs_time_us % 1000000) * 1000); + +#ifndef NDEBUG + mu_->locked_ = false; +#endif + int err = pthread_cond_timedwait(&cv_, &mu_->mu_, &ts); +#ifndef NDEBUG + mu_->locked_ = true; +#endif + if (err == ETIMEDOUT) { + return true; + } + if (err != 0) { + PthreadCall("timedwait", err); + } + return false; +} + +void CondVar::Signal() { PthreadCall("signal", pthread_cond_signal(&cv_)); } + +void CondVar::SignalAll() { + PthreadCall("broadcast", pthread_cond_broadcast(&cv_)); +} + +RWMutex::RWMutex() { + PthreadCall("init mutex", pthread_rwlock_init(&mu_, nullptr)); +} + +RWMutex::~RWMutex() { + PthreadCall("destroy mutex", pthread_rwlock_destroy(&mu_)); +} + +void RWMutex::ReadLock() { + PthreadCall("read lock", pthread_rwlock_rdlock(&mu_)); +} + +void RWMutex::WriteLock() { + PthreadCall("write lock", pthread_rwlock_wrlock(&mu_)); +} + +void RWMutex::ReadUnlock() { + PthreadCall("read unlock", pthread_rwlock_unlock(&mu_)); +} + +void RWMutex::WriteUnlock() { + PthreadCall("write unlock", pthread_rwlock_unlock(&mu_)); +} + +int PhysicalCoreID() { +#if defined(ROCKSDB_SCHED_GETCPU_PRESENT) && defined(__x86_64__) && \ + (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 22)) + // sched_getcpu uses VDSO getcpu() syscall since 2.22. I believe Linux offers + // VDSO support only on x86_64. This is the fastest/preferred method if + // available. + int cpuno = sched_getcpu(); + if (cpuno < 0) { + return -1; + } + return cpuno; +#elif defined(__x86_64__) || defined(__i386__) + // clang/gcc both provide cpuid.h, which defines __get_cpuid(), for x86_64 and + // i386. + unsigned eax, ebx = 0, ecx, edx; + if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx)) { + return -1; + } + return ebx >> 24; +#else + // give up, the caller can generate a random number or something. + return -1; +#endif +} + +void InitOnce(OnceType* once, void (*initializer)()) { + PthreadCall("once", pthread_once(once, initializer)); +} + +void Crash(const std::string& srcfile, int srcline) { + fprintf(stdout, "Crashing at %s:%d\n", srcfile.c_str(), srcline); + fflush(stdout); + kill(getpid(), SIGTERM); +} + +int GetMaxOpenFiles() { +#if defined(RLIMIT_NOFILE) + struct rlimit no_files_limit; + if (getrlimit(RLIMIT_NOFILE, &no_files_limit) != 0) { + return -1; + } + // protect against overflow + if (static_cast(no_files_limit.rlim_cur) >= + static_cast(std::numeric_limits::max())) { + return std::numeric_limits::max(); + } + return static_cast(no_files_limit.rlim_cur); +#endif + return -1; +} + +void* cacheline_aligned_alloc(size_t size) { +#if __GNUC__ < 5 && defined(__SANITIZE_ADDRESS__) + return malloc(size); +#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || defined(__APPLE__)) + void* m; + errno = posix_memalign(&m, CACHE_LINE_SIZE, size); + return errno ? nullptr : m; +#else + return malloc(size); +#endif +} + +void cacheline_aligned_free(void* memblock) { free(memblock); } + +static size_t GetPageSize() { +#if defined(OS_LINUX) || defined(_SC_PAGESIZE) + long v = sysconf(_SC_PAGESIZE); + if (v >= 1024) { + return static_cast(v); + } +#endif + // Default assume 4KB + return 4U * 1024U; +} + +const size_t kPageSize = GetPageSize(); + +void SetCpuPriority(ThreadId id, CpuPriority priority) { +#ifdef OS_LINUX + sched_param param; + param.sched_priority = 0; + switch (priority) { + case CpuPriority::kHigh: + sched_setscheduler(id, SCHED_OTHER, ¶m); + setpriority(PRIO_PROCESS, id, -20); + break; + case CpuPriority::kNormal: + sched_setscheduler(id, SCHED_OTHER, ¶m); + setpriority(PRIO_PROCESS, id, 0); + break; + case CpuPriority::kLow: + sched_setscheduler(id, SCHED_OTHER, ¶m); + setpriority(PRIO_PROCESS, id, 19); + break; + case CpuPriority::kIdle: + sched_setscheduler(id, SCHED_IDLE, ¶m); + break; + default: + assert(false); + } +#else + (void)id; + (void)priority; +#endif +} + +int64_t GetProcessID() { return getpid(); } + +bool GenerateRfcUuid(std::string* output) { + output->clear(); + std::ifstream f("/proc/sys/kernel/random/uuid"); + std::getline(f, /*&*/ *output); + if (output->size() == 36) { + return true; + } else { + output->clear(); + return false; + } +} + +} // namespace port +} // namespace ROCKSDB_NAMESPACE + +#endif -- cgit v1.2.3