CpuThrottle Class Reference

Public Member Functions
	CpuThrottle (double target_pct=2.0, int check_interval_ms=1000)
void	enforce ()

Static Private Member Functions
static long	hertz_total ()

Private Attributes
CpuSnapshot	prev
unsigned long long	prev_total = 0
double	target
int	interval_ms

Detailed Description

Definition at line 200 of file BastionGuard-ransomware-scanner.cpp.

Constructor & Destructor Documentation

CpuThrottle()

CpuThrottle::CpuThrottle ( double target_pct = 2.0, int check_interval_ms = 1000 )

inline

Definition at line 202 of file BastionGuard-ransomware-scanner.cpp.

        : target(target_pct), interval_ms(check_interval_ms)
    {
        prev.ts_ms = now_ms();
        read_proc_stat(prev_total);
        prev.proc_time = 0;
        read_proc_self(prev.proc_time);
    }

References interval_ms, now_ms(), prev, prev_total, CpuSnapshot::proc_time, read_proc_self(), read_proc_stat(), target, and CpuSnapshot::ts_ms.

Member Function Documentation

enforce()

void CpuThrottle::enforce ( )

inline

Definition at line 211 of file BastionGuard-ransomware-scanner.cpp.

                   {
        long long now = now_ms();
        if (now - prev.ts_ms < interval_ms) return;
        unsigned long long cur_total = 0, cur_proc = 0;
        if (!read_proc_stat(cur_total) || !read_proc_self(cur_proc)) {
            prev.ts_ms = now;
            return;
        }
 
        unsigned long long total_diff = (cur_total > prev_total) ? cur_total - prev_total : 0;
        unsigned long long proc_diff  = (cur_proc  > prev.proc_time) ? cur_proc  - prev.proc_time  : 0;
 
        double seconds   = (double)total_diff / (double)hertz_total();
        double proc_secs = (double)proc_diff  / (double)sysconf(_SC_CLK_TCK);
 
        double pct = 0.0;
        if (seconds > 0.0) pct = 100.0 * (proc_secs / seconds);
 
        if (pct > target) {
            double excess = pct - target;
            int base_ms = 50;
            int sleep_ms = (int) std::min(2000.0, base_ms * (excess / std::max(0.1, target)));
            std::this_thread::sleep_for(std::chrono::milliseconds(sleep_ms));
        }
 
        prev_total     = cur_total;
        prev.proc_time = cur_proc;
        prev.ts_ms     = now;
    }

References hertz_total(), interval_ms, now_ms(), prev, prev_total, CpuSnapshot::proc_time, read_proc_self(), read_proc_stat(), target, and CpuSnapshot::ts_ms.

Referenced by main().

hertz_total()

long CpuThrottle::hertz_total ( )

inlinestaticprivate

Definition at line 247 of file BastionGuard-ransomware-scanner.cpp.

                              {
        static long hz = sysconf(_SC_CLK_TCK);
        return hz > 0 ? hz : 100;
    }

Referenced by enforce().

Member Data Documentation

interval_ms

int CpuThrottle::interval_ms

private

Definition at line 245 of file BastionGuard-ransomware-scanner.cpp.

Referenced by CpuThrottle(), and enforce().

prev

CpuSnapshot CpuThrottle::prev

private

Definition at line 242 of file BastionGuard-ransomware-scanner.cpp.

Referenced by CpuThrottle(), and enforce().

prev_total

unsigned long long CpuThrottle::prev_total = 0

private

Definition at line 243 of file BastionGuard-ransomware-scanner.cpp.

Referenced by CpuThrottle(), and enforce().

target

double CpuThrottle::target

private

Definition at line 244 of file BastionGuard-ransomware-scanner.cpp.

Referenced by CpuThrottle(), and enforce().

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The documentation for this class was generated from the following file:

• BastionGuard/src/scanner-ransomware/BastionGuard-ransomware-scanner.cpp