File: port_posix.cc

package info (click to toggle)
rocksdb 5.17.2-3
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 21,164 kB
  • sloc: cpp: 253,035; java: 24,114; perl: 5,769; python: 4,093; ansic: 4,092; sh: 3,861; makefile: 1,754; asm: 547; php: 254; xml: 30
file content (206 lines) | stat: -rw-r--r-- 5,575 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
//  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.

#include "port/port_posix.h"

#include <assert.h>
#if defined(__i386__) || defined(__x86_64__)
#include <cpuid.h>
#endif
#include <errno.h>
#include <sched.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) {
  (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_));
}

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(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 (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;
}

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);
}


}  // namespace port
}  // namespace rocksdb