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rocksdb/port/port_posix.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
// 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 "port/port_posix.h"
#include <assert.h>
#if defined(__i386__) || defined(__x86_64__)
#include <cpuid.h>
#endif
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <cstdlib>
#include "util/logging.h"
namespace rocksdb {
namespace port {
static int PthreadCall(const char* label, int result) {
if (result != 0 && result != ETIMEDOUT) {
fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
abort();
}
return result;
}
Mutex::Mutex(bool 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_));
}
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<time_t>(abs_time_us / 1000000);
ts.tv_nsec = static_cast<suseconds_t>((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(__i386__) || defined(__x86_64__)
// if you ever find that this function is hot on Linux, you can go from
// ~200 nanos to ~20 nanos by adding the machinery to use __vdso_getcpu
unsigned eax, ebx = 0, ecx, edx;
if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
return -1;
}
return ebx >> 24;
#else
int cpuno = sched_getcpu();
if (cpuno < 0) {
return -1;
}
else {
return cpuno;
}
#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 (no_files_limit.rlim_cur >= std::numeric_limits<int>::max()) {
return std::numeric_limits<int>::max();
}
return static_cast<int>(no_files_limit.rlim_cur);
#endif
return -1;
}
} // namespace port
} // namespace rocksdb