my_system_api.h

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/* Copyright (c) 2025, 2026, Oracle and/or its affiliates.
 
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#pragma once
 
#include <optional>
 
/**
  Determines if the current process is running in a container.
  @return true if running in either cgroup v1 or cgroup v2, false otherwise
*/
bool is_running_in_cgroup();
 
/**
  Determines if cgroup restricts resources
  @return true if cgroup restricts resources like memory
*/
bool does_cgroup_limit_resources();
 
/**
  Read the memory limit set by the container. Try cgroup v2, and then cgroup v1
  @return memory limit set by cgroup v2 or cgroup v1; or 0
  @note Return value of 0 implies either no limits are set or server is not
  running in a container
*/
uint64_t my_cgroup_mem_limit();
 
/**
  Find number of VCPUs as seen by the current process based on the
  affinity between each process and VCPU.
*/
uint32_t num_vcpus_using_affinity();
 
/**
  Get the number of VCPUS based on system configuration.
*/
uint32_t num_vcpus_using_config();
 
/**
  Get the number of VCPU.
*/
uint32_t my_system_num_vcpus();