eic-opticks/sysrap/SRngSpec.cc

0001 #include <cstdio>
0002 #include <cstdlib>
0003 #include <cassert>
0004 #include <cstring>
0005 #include <string>
0006 #include <sstream>
0007
0008 #include "SPath.hh"
0009 #include "SRngSpec.hh"
0010 #include "SLOG.hh"
0011
0012 const plog::Severity SRngSpec::LEVEL = SLOG::EnvLevel("SRngSpec", "DEBUG");
0013
0014 const char* SRngSpec::DefaultRngDir()  // static
0015 {
0016     return SPath::GetHomePath(".opticks/rngcache/RNG") ;
0017 }
0018
0019 const char* SRngSpec::CURANDStatePath(const char* rngdir, unsigned rngmax, unsigned long long seed, unsigned long long offset) // static
0020 {
0021     char buf[256];
0022
0023     snprintf(buf, 256, "%s/%s_%u_%llu_%llu.bin",
0024                  rngdir ? rngdir : DefaultRngDir(),
0025                  PREFIX,
0026                  rngmax,
0027                  seed,
0028                  offset);
0029
0030     return strdup(buf) ;
0031 }
0032
0033 SRngSpec::SRngSpec(unsigned rngmax, unsigned long long seed, unsigned long long offset)
0034     :
0035     m_rngmax(rngmax),
0036     m_seed(seed),
0037     m_offset(offset)
0038 {
0039 }
0040
0041 const char* SRngSpec::getCURANDStatePath(const char* rngdir) const
0042 {
0043     return CURANDStatePath(rngdir, m_rngmax, m_seed, m_offset );
0044 }
0045
0046 bool SRngSpec::isValid(const char* rngdir) const
0047 {
0048     const char* path = getCURANDStatePath(rngdir);
0049     bool readable = SPath::IsReadable(path);
0050     LOG_IF(error, !readable)
0051         << " NOT READABLE CURANDStatePath "
0052         << " path " << ( path ? path : "-" )
0053         << " readable " << readable
0054         ;
0055     return readable ;
0056 }
0057
0058 std::string SRngSpec::desc() const
0059 {
0060     std::stringstream ss ;
0061     ss << "SRngSpec"
0062        << " rngmax " << m_rngmax
0063        << " seed " << m_seed
0064        << " offset " << m_offset
0065        ;
0066     return ss.str();
0067 }
0068
0069