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// 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_chromium.h"
#include "base/threading/platform_thread.h"
#include "util/logging.h"
#if defined(USE_SNAPPY)
# include "third_party/snappy/src/snappy.h"
#endif
namespace leveldb {
namespace port {
Mutex::Mutex() {
}
Mutex::~Mutex() {
}
void Mutex::Lock() {
mu_.Acquire();
}
void Mutex::Unlock() {
mu_.Release();
}
void Mutex::AssertHeld() {
mu_.AssertAcquired();
}
CondVar::CondVar(Mutex* mu)
: cv_(&mu->mu_) {
}
CondVar::~CondVar() { }
void CondVar::Wait() {
cv_.Wait();
}
void CondVar::Signal(){
cv_.Signal();
}
void CondVar::SignalAll() {
cv_.Broadcast();
}
void InitOnceImpl(OnceType* once, void (*initializer)()) {
OnceType state = ::base::subtle::Acquire_Load(once);
if (state == ONCE_STATE_DONE)
return;
state = ::base::subtle::NoBarrier_CompareAndSwap(
once,
ONCE_STATE_UNINITIALIZED,
ONCE_STATE_EXECUTING_CLOSURE);
if (state == ONCE_STATE_UNINITIALIZED) {
// We are the first thread, we have to call the closure.
(*initializer)();
::base::subtle::Release_Store(once, ONCE_STATE_DONE);
} else {
// Another thread is running the closure, wait until completion.
while (state == ONCE_STATE_EXECUTING_CLOSURE) {
::base::PlatformThread::YieldCurrentThread();
state = ::base::subtle::Acquire_Load(once);
}
}
}
bool Snappy_Compress(const char* input, size_t input_length,
std::string* output) {
#if defined(USE_SNAPPY)
output->resize(snappy::MaxCompressedLength(input_length));
size_t outlen;
snappy::RawCompress(input, input_length, &(*output)[0], &outlen);
output->resize(outlen);
return true;
#else
return false;
#endif
}
bool Snappy_GetUncompressedLength(const char* input_data,
size_t input_length,
size_t* result) {
#if defined(USE_SNAPPY)
return snappy::GetUncompressedLength(input_data, input_length, result);
#else
return false;
#endif
}
bool Snappy_Uncompress(const char* input_data, size_t input_length,
char* output) {
#if defined(USE_SNAPPY)
return snappy::RawUncompress(input_data, input_length, output);
#else
return false;
#endif
}
}
}
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