#include "cpu/halt.h"
#include "cpu/paging.h"
#include "cpu/serial.h"
#include "cpu/tasking_helpers.h"
#include "kmalloc.h"
#include "tasking.h"
#include <sys/types.h>
#include <string.h>

Macros
#define	MAX_PROCS 32768
	Maximum number of processes that can be running at a time.

#define	HAS_UNBLOCKED_THREADS(proc) (proc->num_threads!=proc->num_threads_blocked)
	Macro to check whethe a process has unblocked threads.

#define	NUM_UNBLOCKED_THREADS(proc) (proc->num_threads-proc->num_threads_blocked)
	Macro to get the number of unblocked threads for a process.

#define	SAME_PROC(thread1, thread2) (thread1->process->pid==thread2->process->pid)
	Macro to check whether two threads have the same PID.

Functions
static char	is_proc_scheduled (pid_t index)

static void	mark_proc_scheduled (pid_t index)

static void	unmark_proc_scheduled (pid_t index)

void	schedule_thread (Thread *thread)

void	tasking_create_task (void eip, void address_space, char kmode, void param1, void param2, char isThread)

void	tasking_init ()

char	tasking_is_privleged ()

pid_t	tasking_get_PID ()

pid_t	tasking_get_TID ()

int *	tasking_get_errno_address ()

pid_t	tasking_new_thread (void start, pid_t pid, void param)

static Thread *	get_next_ready_thread (Thread thread, Thread thread_to_skip)

void	switch_to_thread (Thread *thread)

void	tasking_yield ()

void	tasking_block (thread_state newstate)

static Thread *	get_thread (pid_t pid, pid_t tid)

void	tasking_unblock (pid_t pid, pid_t tid)

void	tasking_exit (int code)

void *	tasking_get_address_space (pid_t pid)

void	tasking_set_rpc_calling_thread (pid_t pid, pid_t tid)

pid_t	tasking_get_rpc_calling_thread (pid_t *tid)

void	tasking_set_rpc_ret_buf (void *buf)

void *	tasking_get_rpc_ret_buf ()

void	tasking_thread_exit ()

char	tasking_check_proc_exists (pid_t pid)

Variables
pid_t	next_pid =0
	PID to use for the next created process.

size_t	num_procs =0
	Number of non-exited processes.

Process	processes [MAX_PROCS]
	Array pf processes by PID.

char	proc_schedule_bmap [MAX_PROCS/8]
	Bitmap of what processes are scheduled.

Thread *	current_thread
	Currently running thread.

static Thread *	ready_to_run_head =NULL
	Head of the linked list of ready to run threads.

static Thread *	ready_to_run_tail =NULL
	Tail of the linked list of ready to run threads.

Function Documentation

◆ get_next_ready_thread()

static Thread* get_next_ready_thread	(	Thread *	thread,
		Thread *	thread_to_skip
	)

static

Get the next ready thread in a list of threads, starting at the specified thread's next thread

Parameters

thread	The start thread
thread_to_skip	A thread to skip even if it's ready

Returns: the next ready thread

◆ get_thread()

static Thread* get_thread	(	pid_t	pid,
		pid_t	tid
	)

static

Get a thread

Parameters

pid	The PID of the thread
tid	The TID of the thread

Returns: the thread wih the specified PID and TID

◆ is_proc_scheduled()

static char is_proc_scheduled ( pid_t index )

static

Check whether a process is scheduled

Parameters

index The PID to check

Returns: whether the process is scheduled

◆ mark_proc_scheduled()

static void mark_proc_scheduled ( pid_t index )

static

Mark a process as scheduled

Parameters

index The PID to mark

◆ schedule_thread()

void schedule_thread ( Thread * thread )

Schedules a thread if the thread's prcess does not have a scheduled thread

Parameters

thread The thread to schedule

◆ switch_to_thread()

void switch_to_thread ( Thread * thread )

Switch to a thread and schedule the next ready thread in the current process, if there is one.

Parameters

thread The thread to switch to

◆ tasking_block()

void tasking_block ( thread_state newstate )

Block the current thread & yield

Parameters

newstate The state to block it in

◆ tasking_check_proc_exists()

char tasking_check_proc_exists ( pid_t pid )

Check if a process exists

Parameters

pid	The param of the process to check

Returns: Whether the process exists

◆ tasking_create_task()

void tasking_create_task	(	void *	eip,
		void *	address_space,
		char	kmode,
		void *	param1,
		void *	param2,
		char	isThread
	)

Create a task

Parameters

eip	The start address of the task
address_space	The address space of the task
kmode	Whether the task is a kernel mode task
param1	The thread's start function first parameter
param2	The thread's start function second parameter
isThread	Whether we are creating a new process or a thread in a process. If we are creating a theead, param2_arg becomes the PID for the newly created thread.

◆ tasking_exit()

void tasking_exit ( int code )

Terminate the current thread If the main thread terminates, the whole process terminates.

Note: Currently, calling tasking_exit from any thread terminates the whole process.

Parameters

code	The exit code of the thread

◆ tasking_get_address_space()

void* tasking_get_address_space ( pid_t pid )

Get the address_space of a process

Parameters

pid	the PID of the process

Returns: the address_space of the process

◆ tasking_get_errno_address()

int* tasking_get_errno_address ( )

Get the adddress of errno for the current thread

Returns: The address of errno

◆ tasking_get_PID()

pid_t tasking_get_PID ( )

Get the PID of the current thread.

Returns: The current thread's PID

◆ tasking_get_rpc_calling_thread()

pid_t tasking_get_rpc_calling_thread ( pid_t * tid )

Get the RPC calling thread for the current thread

Parameters

tid	A pointer to a pid_t to store the return TID

Returns: the return PID

Note: This is only applicable for an RPC handler thread

◆ tasking_get_rpc_ret_buf()

void* tasking_get_rpc_ret_buf ( )

Get the RPC return buffer for the current thread

Returns: the return buffer

◆ tasking_get_TID()

pid_t tasking_get_TID ( )

Get the TID of the current thread.

Returns: The current thread's TID

◆ tasking_init()

void tasking_init ( )

Initialize tasking

◆ tasking_is_privleged()

char tasking_is_privleged ( )

Check whether the current process is privleged

Returns: whether the current process is privleged

◆ tasking_new_thread()

pid_t tasking_new_thread	(	void *	start,
		pid_t	pid,
		void *	param
	)

Create a new thread

Parameters

start	The start address of the task
pid	The PID that gets the new thread
param	The thread's start function parameter

Returns: the TID of the thread

◆ tasking_set_rpc_calling_thread()

void tasking_set_rpc_calling_thread	(	pid_t	pid,
		pid_t	tid
	)

Set the RPC calling thread for an RPC handler thread to the current threasd

Parameters

pid	The PID of the handler thread
tid	The TID of the handler thread

◆ tasking_set_rpc_ret_buf()

void tasking_set_rpc_ret_buf ( void * buf )

Set the RPC return buffer for the calling thread

Parameters

buf	The return buffer

◆ tasking_thread_exit()

void tasking_thread_exit ( )

Terminate the current thread

◆ tasking_unblock()

void tasking_unblock	(	pid_t	pid,
		pid_t	tid
	)

Unblock a thread

Parameters

pid	The PID that contains the thread to unblock
tid	The TID in the process to unblock.

◆ tasking_yield()

void tasking_yield ( )

Yield to the next ready thread in any process

◆ unmark_proc_scheduled()

static void unmark_proc_scheduled ( pid_t index )

static

Unmark a process as scheduled

Parameters

index The PID to unmark

Macros

Functions

Variables

Function Documentation

◆ get_next_ready_thread()

◆ get_thread()

◆ is_proc_scheduled()

◆ mark_proc_scheduled()

◆ schedule_thread()

◆ switch_to_thread()

◆ tasking_block()

◆ tasking_check_proc_exists()

◆ tasking_create_task()

◆ tasking_exit()

◆ tasking_get_address_space()

◆ tasking_get_errno_address()

◆ tasking_get_PID()

◆ tasking_get_rpc_calling_thread()

◆ tasking_get_rpc_ret_buf()

◆ tasking_get_TID()

◆ tasking_init()

◆ tasking_is_privleged()

◆ tasking_new_thread()

◆ tasking_set_rpc_calling_thread()

◆ tasking_set_rpc_ret_buf()

◆ tasking_thread_exit()

◆ tasking_unblock()

◆ tasking_yield()

◆ unmark_proc_scheduled()