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ProcStats.h

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#ifndef ATLASAUDITOR_PROCSTATS_H
#define ATLASAUDITOR_PROCSTATS_H

// Class: ProcStats
// Description:  Keeps statistics on memory usage
// Author: Jim Kowalkowski (FNAL), modified by M. Shapiro (LBNL)


#include <string>
#include <vector>

struct procInfo
{
        procInfo() {}
        procInfo(double sz, double rss_sz): vsize(sz),rss(rss_sz) {}

        bool operator==(const procInfo& p) const
                { return vsize==p.vsize && rss==p.rss; }

        // see proc(4) man pages for units and a description
        double vsize;   // in MB (used to be in pages?)
        double rss;             // in MB (used to be in pages?)
};

class ProcStats
{
public:
        static ProcStats* instance();

        bool fetch(procInfo& fill_me);
        double pageSize() const { return pg_size; }

private:
        ProcStats();
        ~ProcStats();

        struct cleanup
        {
                cleanup() { }
                ~cleanup();
        };

        friend struct cleanup;

        int fd;
        double pg_size;
        procInfo curr;
        std::string fname;
        char buf[500];
        bool valid;

        static ProcStats* inst;
};

#endif

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