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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/process_util.h"
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/sys_info.h"
const int kMicrosecondsPerSecond = 1000000;
namespace base {
int GetCurrentProcId() {
return getpid();
}
ProcessHandle GetCurrentProcessHandle() {
return GetCurrentProcId();
}
int GetProcId(ProcessHandle process) {
return process;
}
ProcessMetrics::ProcessMetrics(ProcessHandle process) : process_(process),
last_time_(0),
last_system_time_(0) {
processor_count_ = base::SysInfo::NumberOfProcessors();
}
// static
ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
return new ProcessMetrics(process);
}
ProcessMetrics::~ProcessMetrics() { }
void EnableTerminationOnHeapCorruption() {
// On POSIX, there nothing to do AFAIK.
}
void RaiseProcessToHighPriority() {
// On POSIX, we don't actually do anything here. We could try to nice() or
// setpriority() or sched_getscheduler, but these all require extra rights.
}
namespace {
int64 TimeValToMicroseconds(const struct timeval& tv) {
return tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec;
}
}
int ProcessMetrics::GetCPUUsage() {
struct timeval now;
struct rusage usage;
int retval = gettimeofday(&now, NULL);
if (retval)
return 0;
retval = getrusage(RUSAGE_SELF, &usage);
if (retval)
return 0;
int64 system_time = (TimeValToMicroseconds(usage.ru_stime) +
TimeValToMicroseconds(usage.ru_utime)) /
processor_count_;
int64 time = TimeValToMicroseconds(now);
if ((last_system_time_ == 0) || (last_time_ == 0)) {
// First call, just set the last values.
last_system_time_ = system_time;
last_time_ = time;
return 0;
}
int64 system_time_delta = system_time - last_system_time_;
int64 time_delta = time - last_time_;
DCHECK(time_delta != 0);
if (time_delta == 0)
return 0;
// We add time_delta / 2 so the result is rounded.
int cpu = static_cast<int>((system_time_delta * 100 + time_delta / 2) /
time_delta);
last_system_time_ = system_time;
last_time_ = time;
return cpu;
}
} // namespace base
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