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// Copyright 2009 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "logger.h"
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <string>
#include <vector>
// This file must work with autoconf on its public version,
// so these includes are correct.
#include "sattypes.h"
Logger *Logger::GlobalLogger() {
static Logger logger;
return &logger;
}
void Logger::VLogF(int priority, const char *format, va_list args) {
if (priority > verbosity_) {
return;
}
char buffer[4096];
size_t length = 0;
if (log_timestamps_) {
time_t raw_time;
time(&raw_time);
struct tm time_struct;
localtime_r(&raw_time, &time_struct);
length = strftime(buffer, sizeof(buffer), "%Y/%m/%d-%H:%M:%S(%Z) ",
&time_struct);
LOGGER_ASSERT(length); // Catch if the buffer is set too small.
}
length += vsnprintf(buffer + length, sizeof(buffer) - length, format, args);
if (length >= sizeof(buffer)) {
length = sizeof(buffer);
buffer[sizeof(buffer) - 1] = '\n';
}
QueueLogLine(new string(buffer, length));
}
void Logger::StartThread() {
LOGGER_ASSERT(!thread_running_);
thread_running_ = true;
LOGGER_ASSERT(0 == pthread_create(&thread_, NULL, &StartRoutine, this));
}
void Logger::StopThread() {
// Allow this to be called before the thread has started.
if (!thread_running_) {
return;
}
thread_running_ = false;
int retval = pthread_mutex_lock(&queued_lines_mutex_);
LOGGER_ASSERT(0 == retval);
bool need_cond_signal = queued_lines_.empty();
queued_lines_.push_back(NULL);
retval = pthread_mutex_unlock(&queued_lines_mutex_);
LOGGER_ASSERT(0 == retval);
if (need_cond_signal) {
retval = pthread_cond_signal(&queued_lines_cond_);
LOGGER_ASSERT(0 == retval);
}
retval = pthread_join(thread_, NULL);
LOGGER_ASSERT(0 == retval);
}
Logger::Logger()
: verbosity_(20),
log_fd_(-1),
thread_running_(false),
log_timestamps_(true) {
LOGGER_ASSERT(0 == pthread_mutex_init(&queued_lines_mutex_, NULL));
LOGGER_ASSERT(0 == pthread_cond_init(&queued_lines_cond_, NULL));
LOGGER_ASSERT(0 == pthread_cond_init(&full_queue_cond_, NULL));
}
Logger::~Logger() {
LOGGER_ASSERT(0 == pthread_mutex_destroy(&queued_lines_mutex_));
LOGGER_ASSERT(0 == pthread_cond_destroy(&queued_lines_cond_));
LOGGER_ASSERT(0 == pthread_cond_destroy(&full_queue_cond_));
}
void Logger::QueueLogLine(string *line) {
LOGGER_ASSERT(line != NULL);
LOGGER_ASSERT(0 == pthread_mutex_lock(&queued_lines_mutex_));
if (thread_running_) {
if (queued_lines_.size() >= kMaxQueueSize) {
LOGGER_ASSERT(0 == pthread_cond_wait(&full_queue_cond_,
&queued_lines_mutex_));
}
if (queued_lines_.empty()) {
LOGGER_ASSERT(0 == pthread_cond_signal(&queued_lines_cond_));
}
queued_lines_.push_back(line);
} else {
WriteAndDeleteLogLine(line);
}
LOGGER_ASSERT(0 == pthread_mutex_unlock(&queued_lines_mutex_));
}
void Logger::WriteAndDeleteLogLine(string *line) {
LOGGER_ASSERT(line != NULL);
ssize_t bytes_written;
if (log_fd_ >= 0) {
bytes_written = write(log_fd_, line->data(), line->size());
LOGGER_ASSERT(bytes_written == static_cast<ssize_t>(line->size()));
}
bytes_written = write(STDOUT_FILENO, line->data(), line->size());
LOGGER_ASSERT(bytes_written == static_cast<ssize_t>(line->size()));
delete line;
}
void *Logger::StartRoutine(void *ptr) {
Logger *self = static_cast<Logger*>(ptr);
self->ThreadMain();
return NULL;
}
void Logger::ThreadMain() {
vector<string*> local_queue;
LOGGER_ASSERT(0 == pthread_mutex_lock(&queued_lines_mutex_));
for (;;) {
if (queued_lines_.empty()) {
LOGGER_ASSERT(0 == pthread_cond_wait(&queued_lines_cond_,
&queued_lines_mutex_));
continue;
}
// We move the log lines into a local queue so we can release the lock
// while writing them to disk, preventing other threads from blocking on
// our writes.
local_queue.swap(queued_lines_);
if (local_queue.size() >= kMaxQueueSize) {
LOGGER_ASSERT(0 == pthread_cond_broadcast(&full_queue_cond_));
}
// Unlock while we process our local queue.
LOGGER_ASSERT(0 == pthread_mutex_unlock(&queued_lines_mutex_));
for (vector<string*>::const_iterator it = local_queue.begin();
it != local_queue.end(); ++it) {
if (*it == NULL) {
// NULL is guaranteed to be at the end.
return;
}
WriteAndDeleteLogLine(*it);
}
local_queue.clear();
// We must hold the lock at the start of each iteration of this for loop.
LOGGER_ASSERT(0 == pthread_mutex_lock(&queued_lines_mutex_));
}
}
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