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// $Id$
#include "ace/Monitor_Control/CPU_Load_Monitor.h"
#if defined (ACE_HAS_MONITOR_FRAMEWORK) && (ACE_HAS_MONITOR_FRAMEWORK == 1)
#if defined (ACE_HAS_KSTAT)
#include <sys/sysinfo.h>
#endif
#if defined (ACE_LINUX)
#include "ace/OS_NS_stdio.h"
#endif
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
namespace ACE
{
namespace Monitor_Control
{
const char* CPU_Load_Monitor::default_name_ =
"OS/Processor/CPULoad";
CPU_Load_Monitor::CPU_Load_Monitor (const char* name)
: Monitor_Base (name, Monitor_Control_Types::MC_NUMBER)
#if defined (ACE_HAS_WIN32_PDH)
, Windows_Monitor (ACE_TEXT("\\Processor(_Total)\\% Processor Time"))
#endif
#if defined (ACE_LINUX) || defined (ACE_HAS_KSTAT)
, user_ (0)
, wait_ (0)
, kernel_ (0)
, idle_ (0)
, prev_idle_ (0)
, prev_total_ (0.0)
#endif
#if defined (ACE_LINUX)
, file_ptr_ (0)
#elif defined (ACE_HAS_KSTAT)
, kstats_ (0)
, kstat_ (0)
, kstat_id_ (0)
#endif
{
this->init ();
}
void
CPU_Load_Monitor::update (void)
{
#if defined (ACE_HAS_WIN32_PDH)
this->update_i ();
this->receive (this->value_);
#elif defined (ACE_LINUX)
this->access_proc_stat (&this->idle_);
#elif defined (ACE_HAS_KSTAT)
this->access_kstats (&this->idle_);
#endif
#if defined (ACE_LINUX) || defined (ACE_HAS_KSTAT)
double delta_idle = this->idle_ - this->prev_idle_;
double total =
this->user_ + this->wait_ + this->kernel_ + this->idle_;
double delta_total = total - this->prev_total_;
if (ACE::is_equal (delta_total, 0.0))
{
/// The system hasn't updated /proc/stat since the last call
/// to update(), we must avoid dividing by 0.
return;
}
double percent_cpu_load = 100.0 - (delta_idle / delta_total * 100.0);
/// Stores value and timestamp with thread-safety.
this->receive (percent_cpu_load);
this->prev_idle_ = this->idle_;
this->prev_total_ = total;
#endif
}
const char*
CPU_Load_Monitor::default_name (void)
{
return CPU_Load_Monitor::default_name_;
}
void
CPU_Load_Monitor::clear_i (void)
{
#if defined (ACE_HAS_WIN32_PDH)
this->clear_impl ();
#endif
this->init ();
this->Monitor_Base::clear_i ();
}
void
CPU_Load_Monitor::init (void)
{
#if defined (ACE_LINUX)
/// All data in this file are stored as running 'jiffy' totals, so we
/// get values here in the constructor to subtract for the difference
/// in subsequent calls.
this->access_proc_stat (&this->prev_idle_);
this->prev_total_ =
this->user_ + this->wait_ + this->kernel_ + this->prev_idle_;
#elif defined (ACE_HAS_KSTAT)
/// Stored similarly to Linux, in a system file.
this->access_kstats (&this->prev_idle_);
this->prev_total_ =
this->user_ + this->wait_ + this->kernel_ + this->prev_idle_;
#endif
}
#if defined (ACE_LINUX)
void
CPU_Load_Monitor::access_proc_stat (unsigned long *which_idle)
{
this->file_ptr_ = ACE_OS::fopen (ACE_TEXT ("/proc/stat"),
ACE_TEXT ("r"));
if (this->file_ptr_ == 0)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("CPU load - opening /proc/stat failed\n")));
return;
}
char *item = 0;
char *arg = 0;
while ((ACE_OS::fgets (buf_, sizeof (buf_), file_ptr_)) != 0)
{
item = ACE_OS::strtok (this->buf_, " \t\n");
arg = ACE_OS::strtok (0, "\n");
if (item == 0 || arg == 0)
{
continue;
}
if (ACE_OS::strcmp (item, "cpu") == 0)
{
sscanf (arg,
"%lu %lu %lu %lu",
&this->user_,
&this->wait_,
&this->kernel_,
which_idle);
break;
}
}
ACE_OS::fclose (this->file_ptr_);
}
#endif
#if defined (ACE_HAS_KSTAT)
void
CPU_Load_Monitor::access_kstats (unsigned long *which_idle)
{
this->kstats_ = kstat_open ();
if (this->kstats_ == 0)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("opening kstats file failed\n")));
return;
}
this->kstat_id_ = this->kstats_->kc_chain_id;
while (true)
{
this->kernel_ = 0UL;
this->wait_ = 0UL;
this->user_ = 0UL;
(*which_idle) = 0UL;
/// Unlike Linux's "/proc/stat", there is no entry for total CPU
/// stats, so we have to sum them manually.
for (this->kstat_ = this->kstats_->kc_chain;
this->kstat_ != 0;
this->kstat_ = this->kstat_->ks_next)
{
int result = ACE_OS::strncmp (this->kstat_->ks_name,
"cpu_stat",
ACE_OS::strlen ("cpu_stat"));
if (result == 0)
{
/// Because the kstat chain can change dynamically,
/// watch the chain ID and restart the walk if the ID
/// differs from what we saw during the walk. The restart
/// is done by breaking from the cycle with kstat_ not 0.
kid_t kstat_id = kstat_read (this->kstats_, this->kstat_, 0);
if (kstat_id != this->kstat_id_)
{
break;
}
cpu_stat_t &kstat_cpu =
*((cpu_stat_t *) this->kstat_->ks_data);
this->kernel_ += kstat_cpu.cpu_sysinfo.cpu[CPU_KERNEL];
this->wait_ += kstat_cpu.cpu_sysinfo.cpu[CPU_WAIT];
this->user_ += kstat_cpu.cpu_sysinfo.cpu[CPU_USER];
(*which_idle) += kstat_cpu.cpu_sysinfo.cpu[CPU_IDLE];
}
}
if (this->kstat_ != 0)
{
/// The ID changed underneath us, so get the new one and
/// start again.
this->kstat_id_ = kstat_chain_update (this->kstats_);
if (! this->kstat_id_ > 0)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("kstat chain update ")
ACE_TEXT ("returned null id\n")));
return;
}
}
else
{
/// Clean run, exit the WHILE loop.
break;
}
}
int status = kstat_close (this->kstats_);
if (status != 0)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("closing kstats file failed\n")));
}
}
#endif
}
}
ACE_END_VERSIONED_NAMESPACE_DECL
#endif /* ACE_HAS_MONITOR_FRAMEWORK==1 */
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