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b13a68e129
c521b3ac6 Merge #11: fixup define checks. Cleans up some oopses from #5. 8b1cd3753 fixup define checks. Cleans up some oopses from #5. 6b1508d6d Merge #6: Fixes typo fceb80542 Merge #10: Clean up compile-time warnings (gcc 7.1) 0ec2a343f Clean up compile-time warnings (gcc 7.1) d4c268a35 Merge #5: Move helper functions out of sse4.2 object 8d4eb0847 Add HasAcceleratedCRC32C to port_win.h 77cfbfd25 crc32: move helper functions out of port_posix_sse.cc 4c1e9e016 silence compiler warnings about uninitialized variables 495316485 Merge #2: Prefer std::atomic over MemoryBarrier 2953978ef Fixes typo f134284a1 Merge #1: Merge upstream LevelDB 1.20 ba8a445fd Prefer std::atomic over MemoryBarrier git-subtree-dir: src/leveldb git-subtree-split: c521b3ac654cfbe009c575eacf7e5a6e189bb5bb
68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
// 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 "port/port_posix.h"
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#include <cstdlib>
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#include <stdio.h>
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#include <string.h>
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#if (defined(__x86_64__) || defined(__i386__)) && defined(__GNUC__)
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#include <cpuid.h>
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#endif
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namespace leveldb {
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namespace port {
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static void PthreadCall(const char* label, int result) {
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if (result != 0) {
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fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
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abort();
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}
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}
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Mutex::Mutex() { PthreadCall("init mutex", pthread_mutex_init(&mu_, NULL)); }
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Mutex::~Mutex() { PthreadCall("destroy mutex", pthread_mutex_destroy(&mu_)); }
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void Mutex::Lock() { PthreadCall("lock", pthread_mutex_lock(&mu_)); }
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void Mutex::Unlock() { PthreadCall("unlock", pthread_mutex_unlock(&mu_)); }
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CondVar::CondVar(Mutex* mu)
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: mu_(mu) {
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PthreadCall("init cv", pthread_cond_init(&cv_, NULL));
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}
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CondVar::~CondVar() { PthreadCall("destroy cv", pthread_cond_destroy(&cv_)); }
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void CondVar::Wait() {
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PthreadCall("wait", pthread_cond_wait(&cv_, &mu_->mu_));
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}
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void CondVar::Signal() {
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PthreadCall("signal", pthread_cond_signal(&cv_));
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}
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void CondVar::SignalAll() {
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PthreadCall("broadcast", pthread_cond_broadcast(&cv_));
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}
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void InitOnce(OnceType* once, void (*initializer)()) {
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PthreadCall("once", pthread_once(once, initializer));
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}
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bool HasAcceleratedCRC32C() {
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#if (defined(__x86_64__) || defined(__i386__)) && defined(__GNUC__)
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unsigned int eax, ebx, ecx, edx;
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__get_cpuid(1, &eax, &ebx, &ecx, &edx);
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return (ecx & (1 << 20)) != 0;
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#else
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return false;
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#endif
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}
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} // namespace port
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} // namespace leveldb
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