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/* -------------------------------------------
Copyright ZKA Technologies.
------------------------------------------- */
#ifndef _INC_PROCESS_SCHEDULER_HXX_
#define _INC_PROCESS_SCHEDULER_HXX_
#include <ArchKit/ArchKit.hxx>
#include <KernelKit/LockDelegate.hxx>
#include <KernelKit/User.hxx>
#include <NewKit/MutableArray.hxx>
#define kSchedMinMicroTime (AffinityKind::kStandard)
#define kSchedInvalidPID (-1)
#define kSchedMaxStackSz (4096) /* Max stack sz */
#define kSchedProcessLimitPerTeam (16U)
////////////////////////////////////////////////////
// LAST REV: Mon Feb 12 13:52:01 CET 2024
////////////////////////////////////////////////////
namespace Kernel
{
//! @brief Forward declarations.
struct UserProcess;
class PEFDLLInterface;
class ProcessTeam;
class UserProcessScheduler;
class ProcessHelper;
//! @brief UserProcess identifier.
typedef Int64 ProcessID;
//! @brief UserProcess name length.
inline constexpr SizeT kProcessLen = 256U;
//! @brief UserProcess status enum.
enum class ProcessStatus : Int32
{
kStarting,
kRunning,
kKilled,
kFrozen,
kDead
};
//! @brief Affinity is the amount of nano-seconds this process is going
//! to run.
enum class AffinityKind : Int32
{
kRealTime = 0000,
kVeryHigh = 2500,
kHigh = 2000,
kStandard = 1500,
kLowUsage = 1000,
kVeryLowUsage = 5000,
};
// operator overloading.
inline bool operator<(AffinityKind lhs, AffinityKind rhs)
{
Int32 lhs_int = static_cast<Int>(lhs);
Int32 rhs_int = static_cast<Int>(rhs);
return lhs_int < rhs_int;
}
inline bool operator>(AffinityKind lhs, AffinityKind rhs)
{
Int32 lhs_int = static_cast<Int>(lhs);
Int32 rhs_int = static_cast<Int>(rhs);
return lhs_int > rhs_int;
}
inline bool operator<=(AffinityKind lhs, AffinityKind rhs)
{
Int32 lhs_int = static_cast<Int>(lhs);
Int32 rhs_int = static_cast<Int>(rhs);
return lhs_int <= rhs_int;
}
inline bool operator>=(AffinityKind lhs, AffinityKind rhs)
{
Int32 lhs_int = static_cast<Int>(lhs);
Int32 rhs_int = static_cast<Int>(rhs);
return lhs_int >= rhs_int;
}
// end of operator overloading.
enum ProcessSubsystemEnum
{
eProcessSubsystemSecurity,
eProcessSubsystemNative,
eProcessSubsystemInvalid,
eProcessSubsystemCount,
};
using ProcessSubsystem = ProcessSubsystemEnum;
using ProcessTime = UInt64;
using PID = Int64;
// for permission manager, tells where we run the code.
enum class ProcessLevelRing : Int32
{
kRingStdUser = 1,
kRingSuperUser = 2,
kRingGuestUser = 5,
kRingCount = 5,
};
// Helper types.
using ImagePtr = VoidPtr;
using HeapPtrKind = VoidPtr;
/// @name UserProcess
/// @brief User process block.
/// Holds information about the running process/thread.
struct UserProcess final
{
public:
explicit UserProcess(VoidPtr startImage = nullptr)
: Image(startImage)
{
}
~UserProcess() = default;
ZKA_COPY_DEFAULT(UserProcess)
public:
void SetEntrypoint(VoidPtr imageStart) noexcept;
const UInt32& GetExitCode() noexcept;
public:
Char Name[kProcessLen] = {"PROCESS #0 (TEAM 0)"};
ProcessSubsystem SubSystem{ProcessSubsystem::eProcessSubsystemInvalid};
User* Owner{nullptr};
HAL::StackFramePtr StackFrame{nullptr};
AffinityKind Affinity{AffinityKind::kStandard};
ProcessStatus Status{ProcessStatus::kDead};
UInt8* StackReserve{ nullptr };
// Memory, images pointers.
HeapPtrKind HeapCursor{nullptr};
ImagePtr Image{nullptr};
HeapPtrKind HeapPtr{nullptr};
SizeT StackSize{mib_cast(8)};
// shared library handle, reserved for kDLLKind types of executables only.
PEFDLLInterface* DLLPtr{nullptr};
UserProcess* Parent{nullptr};
// Memory usage.
SizeT UsedMemory{0};
SizeT FreeMemory{0};
SizeT SizeMemory{gib_cast(4)};
enum
{
kExeKind = 1,
kDLLKind = 2,
kKindCount,
};
ProcessTime PTime{0};
PID ProcessId{kSchedInvalidPID};
Int32 Kind{kExeKind};
public:
//! @brief boolean operator, check status.
operator bool()
{
return Status != ProcessStatus::kDead;
}
///! @brief Crashes the app, exits with code ~0.
Void Crash();
///! @brief Exits the app.
Void Exit(const Int32& exit_code = 0);
///! @brief TLS allocate.
///! @param sz size of new ptr.
VoidPtr New(const SizeT& sz);
///! @brief TLS free.
///! @param ptr the pointer to free.
///! @param sz the size of it.
Boolean Delete(VoidPtr ptr, const SizeT& sz);
///! @brief Wakes up threads.
Void Wake(const bool wakeup = false);
// UserProcess getters.
public:
///! @brief Get the process's name
///! @example 'C Runtime Library'
const Char* GetProcessName() noexcept;
//! @brief return local error code of process.
//! @return Int32 local error code.
Int32& GetLocalCode() noexcept;
const User* GetOwner() noexcept;
const ProcessStatus& GetStatus() noexcept;
const AffinityKind& GetAffinity() noexcept;
private:
UInt32 fLastExitCode{0};
Int32 fLocalCode{0};
friend UserProcessScheduler;
friend ProcessHelper;
};
/// \brief Processs Team (contains multiple processes inside it.)
/// Equivalent to a process batch
class ProcessTeam final
{
public:
explicit ProcessTeam() = default;
~ProcessTeam() = default;
ZKA_COPY_DEFAULT(ProcessTeam);
Array<UserProcess, kSchedProcessLimitPerTeam>& AsArray();
Ref<UserProcess>& AsRef();
ProcessID& Id() noexcept;
public:
Array<UserProcess, kSchedProcessLimitPerTeam> mProcessList;
Ref<UserProcess> mCurrentProcess;
SizeT mProcessAmount{0};
ProcessID mTeamId{0};
};
using UserProcessPtr = UserProcess*;
/// @brief UserProcess scheduler class.
/// The main class which you call to schedule processes.
class UserProcessScheduler final
{
public:
explicit UserProcessScheduler() = default;
~UserProcessScheduler() = default;
ZKA_COPY_DEFAULT(UserProcessScheduler)
operator bool();
bool operator!();
public:
ProcessTeam& CurrentTeam();
public:
SizeT Add(UserProcess& processRef);
Bool Remove(ProcessID processSlot);
public:
Ref<UserProcess>& CurrentProcess();
SizeT Run() noexcept;
public:
STATIC UserProcessScheduler& The();
private:
ProcessTeam mTeam;
};
/*
* \brief UserProcess helper class, which contains needed utilities for the scheduler.
*/
class ProcessHelper final
{
public:
STATIC bool Switch(VoidPtr image_ptr, UInt8* stack_ptr, HAL::StackFramePtr frame_ptr, const PID& new_pid);
STATIC bool CanBeScheduled(UserProcess& process);
STATIC PID& TheCurrentPID();
STATIC SizeT StartScheduling();
};
const UInt32& sched_get_exit_code(void) noexcept;
} // namespace Kernel
#include <KernelKit/ThreadLocalStorage.hxx>
////////////////////////////////////////////////////
// END
////////////////////////////////////////////////////
#endif /* ifndef _INC_PROCESS_SCHEDULER_HXX_ */
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