process_usage.h

#ifndef SOURCEMETA_CORE_PROCESS_USAGE_H_
#define SOURCEMETA_CORE_PROCESS_USAGE_H_
 
#ifndef SOURCEMETA_CORE_PROCESS_EXPORT
#include <sourcemeta/core/process_export.h>
#endif
 
#include <chrono>   // std::chrono::nanoseconds, std::chrono::system_clock
#include <cstdint>  // std::uint64_t
#include <optional> // std::optional
 
namespace sourcemeta::core {

struct ProcessUsage {
  std::optional<std::chrono::nanoseconds> cpu_time{std::nullopt};
  std::optional<std::uint64_t> resident_bytes{std::nullopt};
  std::optional<std::uint64_t> virtual_bytes{std::nullopt};
};

struct ProcessDescriptors {
  std::optional<std::uint64_t> open{std::nullopt};
  std::optional<std::uint64_t> maximum{std::nullopt};
};

SOURCEMETA_CORE_PROCESS_EXPORT
auto process_usage() noexcept -> ProcessUsage;

SOURCEMETA_CORE_PROCESS_EXPORT
auto process_descriptors() noexcept -> ProcessDescriptors;

SOURCEMETA_CORE_PROCESS_EXPORT
auto process_start_time() noexcept
    -> std::optional<std::chrono::system_clock::time_point>;
 
} // namespace sourcemeta::core
 
#endif