1 use core::{ 2 hash::{Hash, Hasher}, 3 hint::spin_loop, 4 intrinsics::{likely, unlikely}, 5 mem::ManuallyDrop, 6 sync::atomic::{compiler_fence, AtomicBool, AtomicI32, AtomicIsize, AtomicUsize, Ordering}, 7 }; 8 9 use alloc::{ 10 string::{String, ToString}, 11 sync::{Arc, Weak}, 12 vec::Vec, 13 }; 14 use hashbrown::HashMap; 15 16 use crate::{ 17 arch::{ 18 ipc::signal::{AtomicSignal, SigSet, Signal}, 19 process::ArchPCBInfo, 20 sched::sched, 21 CurrentIrqArch, 22 }, 23 exception::InterruptArch, 24 filesystem::{ 25 procfs::procfs_unregister_pid, 26 vfs::{file::FileDescriptorVec, FileType}, 27 }, 28 ipc::signal_types::{SigInfo, SigPending, SignalStruct}, 29 kdebug, kinfo, 30 libs::{ 31 align::AlignedBox, 32 casting::DowncastArc, 33 futex::{ 34 constant::{FutexFlag, FUTEX_BITSET_MATCH_ANY}, 35 futex::Futex, 36 }, 37 lock_free_flags::LockFreeFlags, 38 rwlock::{RwLock, RwLockReadGuard, RwLockUpgradableGuard, RwLockWriteGuard}, 39 spinlock::{SpinLock, SpinLockGuard}, 40 wait_queue::WaitQueue, 41 }, 42 mm::{percpu::PerCpuVar, set_INITIAL_PROCESS_ADDRESS_SPACE, ucontext::AddressSpace, VirtAddr}, 43 net::socket::SocketInode, 44 sched::{ 45 completion::Completion, 46 core::{sched_enqueue, CPU_EXECUTING}, 47 SchedPolicy, SchedPriority, 48 }, 49 smp::kick_cpu, 50 syscall::{user_access::clear_user, Syscall, SystemError}, 51 }; 52 53 use self::kthread::WorkerPrivate; 54 55 pub mod abi; 56 pub mod c_adapter; 57 pub mod exec; 58 pub mod fork; 59 pub mod idle; 60 pub mod init; 61 pub mod kthread; 62 pub mod pid; 63 pub mod process; 64 pub mod resource; 65 pub mod syscall; 66 67 /// 系统中所有进程的pcb 68 static ALL_PROCESS: SpinLock<Option<HashMap<Pid, Arc<ProcessControlBlock>>>> = SpinLock::new(None); 69 70 pub static mut SWITCH_RESULT: Option<PerCpuVar<SwitchResult>> = None; 71 72 /// 一个只改变1次的全局变量，标志进程管理器是否已经初始化完成 73 static mut __PROCESS_MANAGEMENT_INIT_DONE: bool = false; 74 75 #[derive(Debug)] 76 pub struct SwitchResult { 77 pub prev_pcb: Option<Arc<ProcessControlBlock>>, 78 pub next_pcb: Option<Arc<ProcessControlBlock>>, 79 } 80 81 impl SwitchResult { 82 pub fn new() -> Self { 83 Self { 84 prev_pcb: None, 85 next_pcb: None, 86 } 87 } 88 } 89 90 #[derive(Debug)] 91 pub struct ProcessManager; 92 impl ProcessManager { 93 fn init() { 94 static INIT_FLAG: AtomicBool = AtomicBool::new(false); 95 if INIT_FLAG 96 .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst) 97 .is_err() 98 { 99 panic!("ProcessManager has been initialized!"); 100 } 101 102 unsafe { 103 compiler_fence(Ordering::SeqCst); 104 kdebug!("To create address space for INIT process."); 105 // test_buddy(); 106 set_INITIAL_PROCESS_ADDRESS_SPACE( 107 AddressSpace::new(true).expect("Failed to create address space for INIT process."), 108 ); 109 kdebug!("INIT process address space created."); 110 compiler_fence(Ordering::SeqCst); 111 }; 112 113 ALL_PROCESS.lock().replace(HashMap::new()); 114 Self::arch_init(); 115 kdebug!("process arch init done."); 116 Self::init_idle(); 117 kdebug!("process idle init done."); 118 119 unsafe { 120 __PROCESS_MANAGEMENT_INIT_DONE = true; 121 } 122 kinfo!("Process Manager initialized."); 123 } 124 125 /// 判断进程管理器是否已经初始化完成 126 pub fn initialized() -> bool { 127 unsafe { __PROCESS_MANAGEMENT_INIT_DONE } 128 } 129 130 /// 获取当前进程的pcb 131 pub fn current_pcb() -> Arc<ProcessControlBlock> { 132 if unlikely(unsafe { !__PROCESS_MANAGEMENT_INIT_DONE }) { 133 kerror!("unsafe__PROCESS_MANAGEMENT_INIT_DONE == false"); 134 loop { 135 spin_loop(); 136 } 137 } 138 return ProcessControlBlock::arch_current_pcb(); 139 } 140 141 /// 增加当前进程的锁持有计数 142 #[inline(always)] 143 pub fn preempt_disable() { 144 if likely(unsafe { __PROCESS_MANAGEMENT_INIT_DONE }) { 145 ProcessManager::current_pcb().preempt_disable(); 146 } 147 } 148 149 /// 减少当前进程的锁持有计数 150 #[inline(always)] 151 pub fn preempt_enable() { 152 if likely(unsafe { __PROCESS_MANAGEMENT_INIT_DONE }) { 153 ProcessManager::current_pcb().preempt_enable(); 154 } 155 } 156 157 /// 根据pid获取进程的pcb 158 /// 159 /// ## 参数 160 /// 161 /// - `pid` : 进程的pid 162 /// 163 /// ## 返回值 164 /// 165 /// 如果找到了对应的进程，那么返回该进程的pcb，否则返回None 166 pub fn find(pid: Pid) -> Option<Arc<ProcessControlBlock>> { 167 return ALL_PROCESS.lock().as_ref()?.get(&pid).cloned(); 168 } 169 170 /// 向系统中添加一个进程的pcb 171 /// 172 /// ## 参数 173 /// 174 /// - `pcb` : 进程的pcb 175 /// 176 /// ## 返回值 177 /// 178 /// 无 179 pub fn add_pcb(pcb: Arc<ProcessControlBlock>) { 180 ALL_PROCESS 181 .lock() 182 .as_mut() 183 .unwrap() 184 .insert(pcb.pid(), pcb.clone()); 185 } 186 187 /// 唤醒一个进程 188 pub fn wakeup(pcb: &Arc<ProcessControlBlock>) -> Result<(), SystemError> { 189 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 190 let state = pcb.sched_info().state(); 191 if state.is_blocked() { 192 let mut writer: RwLockWriteGuard<'_, ProcessSchedulerInfo> = pcb.sched_info_mut(); 193 let state = writer.state(); 194 if state.is_blocked() { 195 writer.set_state(ProcessState::Runnable); 196 // avoid deadlock 197 drop(writer); 198 199 sched_enqueue(pcb.clone(), true); 200 return Ok(()); 201 } else if state.is_exited() { 202 return Err(SystemError::EINVAL); 203 } else { 204 return Ok(()); 205 } 206 } else if state.is_exited() { 207 return Err(SystemError::EINVAL); 208 } else { 209 return Ok(()); 210 } 211 } 212 213 /// 唤醒暂停的进程 214 pub fn wakeup_stop(pcb: &Arc<ProcessControlBlock>) -> Result<(), SystemError> { 215 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 216 let state = pcb.sched_info().state(); 217 if let ProcessState::Stopped = state { 218 let mut writer = pcb.sched_info_mut(); 219 let state = writer.state(); 220 if let ProcessState::Stopped = state { 221 writer.set_state(ProcessState::Runnable); 222 // avoid deadlock 223 drop(writer); 224 225 sched_enqueue(pcb.clone(), true); 226 return Ok(()); 227 } else if state.is_runnable() { 228 return Ok(()); 229 } else { 230 return Err(SystemError::EINVAL); 231 } 232 } else if state.is_runnable() { 233 return Ok(()); 234 } else { 235 return Err(SystemError::EINVAL); 236 } 237 } 238 239 /// 标志当前进程永久睡眠，但是发起调度的工作，应该由调用者完成 240 /// 241 /// ## 注意 242 /// 243 /// - 进入当前函数之前，不能持有sched_info的锁 244 /// - 进入当前函数之前，必须关闭中断 245 /// - 进入当前函数之后必须保证逻辑的正确性，避免被重复加入调度队列 246 pub fn mark_sleep(interruptable: bool) -> Result<(), SystemError> { 247 assert_eq!( 248 CurrentIrqArch::is_irq_enabled(), 249 false, 250 "interrupt must be disabled before enter ProcessManager::mark_sleep()" 251 ); 252 253 let pcb = ProcessManager::current_pcb(); 254 let mut writer = pcb.sched_info_mut_irqsave(); 255 if !matches!(writer.state(), ProcessState::Exited(_)) { 256 writer.set_state(ProcessState::Blocked(interruptable)); 257 pcb.flags().insert(ProcessFlags::NEED_SCHEDULE); 258 drop(writer); 259 260 return Ok(()); 261 } 262 return Err(SystemError::EINTR); 263 } 264 265 /// 标志当前进程为停止状态，但是发起调度的工作，应该由调用者完成 266 /// 267 /// ## 注意 268 /// 269 /// - 进入当前函数之前，不能持有sched_info的锁 270 /// - 进入当前函数之前，必须关闭中断 271 pub fn mark_stop() -> Result<(), SystemError> { 272 assert_eq!( 273 CurrentIrqArch::is_irq_enabled(), 274 false, 275 "interrupt must be disabled before enter ProcessManager::mark_stop()" 276 ); 277 278 let pcb = ProcessManager::current_pcb(); 279 let mut writer = pcb.sched_info_mut_irqsave(); 280 if !matches!(writer.state(), ProcessState::Exited(_)) { 281 writer.set_state(ProcessState::Stopped); 282 pcb.flags().insert(ProcessFlags::NEED_SCHEDULE); 283 drop(writer); 284 285 return Ok(()); 286 } 287 return Err(SystemError::EINTR); 288 } 289 /// 当子进程退出后向父进程发送通知 290 fn exit_notify() { 291 let current = ProcessManager::current_pcb(); 292 // 让INIT进程收养所有子进程 293 if current.pid() != Pid(1) { 294 unsafe { 295 current 296 .adopt_childen() 297 .unwrap_or_else(|e| panic!("adopte_childen failed: error: {e:?}")) 298 }; 299 let r = current.parent_pcb.read().upgrade(); 300 if r.is_none() { 301 return; 302 } 303 let parent_pcb = r.unwrap(); 304 let r = Syscall::kill(parent_pcb.pid(), Signal::SIGCHLD as i32); 305 if r.is_err() { 306 kwarn!( 307 "failed to send kill signal to {:?}'s parent pcb {:?}", 308 current.pid(), 309 parent_pcb.pid() 310 ); 311 } 312 // todo: 这里需要向父进程发送SIGCHLD信号 313 // todo: 这里还需要根据线程组的信息，决定信号的发送 314 } 315 } 316 317 /// 退出当前进程 318 /// 319 /// ## 参数 320 /// 321 /// - `exit_code` : 进程的退出码 322 pub fn exit(exit_code: usize) -> ! { 323 // 关中断 324 let irq_guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 325 let pcb = ProcessManager::current_pcb(); 326 pcb.sched_info 327 .write() 328 .set_state(ProcessState::Exited(exit_code)); 329 pcb.wait_queue.wakeup(Some(ProcessState::Blocked(true))); 330 331 // 进行进程退出后的工作 332 let thread = pcb.thread.write(); 333 if let Some(addr) = thread.set_child_tid { 334 unsafe { clear_user(addr, core::mem::size_of::<i32>()).expect("clear tid failed") }; 335 } 336 337 if let Some(addr) = thread.clear_child_tid { 338 if Arc::strong_count(&pcb.basic().user_vm().expect("User VM Not found")) > 1 { 339 let _ = 340 Futex::futex_wake(addr, FutexFlag::FLAGS_MATCH_NONE, 1, FUTEX_BITSET_MATCH_ANY); 341 } 342 unsafe { clear_user(addr, core::mem::size_of::<i32>()).expect("clear tid failed") }; 343 } 344 345 // 如果是vfork出来的进程，则需要处理completion 346 if thread.vfork_done.is_some() { 347 thread.vfork_done.as_ref().unwrap().complete_all(); 348 } 349 drop(thread); 350 unsafe { pcb.basic_mut().set_user_vm(None) }; 351 drop(pcb); 352 ProcessManager::exit_notify(); 353 drop(irq_guard); 354 355 sched(); 356 loop {} 357 } 358 359 pub unsafe fn release(pid: Pid) { 360 let pcb = ProcessManager::find(pid); 361 if !pcb.is_none() { 362 // let pcb = pcb.unwrap(); 363 // 判断该pcb是否在全局没有任何引用 364 // TODO: 当前，pcb的Arc指针存在泄露问题，引用计数不正确，打算在接下来实现debug专用的Arc，方便调试，然后解决这个bug。 365 // 因此目前暂时注释掉，使得能跑 366 // if Arc::strong_count(&pcb) <= 2 { 367 // drop(pcb); 368 // ALL_PROCESS.lock().as_mut().unwrap().remove(&pid); 369 // } else { 370 // // 如果不为1就panic 371 // let msg = format!("pcb '{:?}' is still referenced, strong count={}",pcb.pid(), Arc::strong_count(&pcb)); 372 // kerror!("{}", msg); 373 // panic!() 374 // } 375 376 ALL_PROCESS.lock().as_mut().unwrap().remove(&pid); 377 } 378 } 379 380 /// 上下文切换完成后的钩子函数 381 unsafe fn switch_finish_hook() { 382 // kdebug!("switch_finish_hook"); 383 let prev_pcb = SWITCH_RESULT 384 .as_mut() 385 .unwrap() 386 .get_mut() 387 .prev_pcb 388 .take() 389 .expect("prev_pcb is None"); 390 let next_pcb = SWITCH_RESULT 391 .as_mut() 392 .unwrap() 393 .get_mut() 394 .next_pcb 395 .take() 396 .expect("next_pcb is None"); 397 398 // 由于进程切换前使用了SpinLockGuard::leak()，所以这里需要手动释放锁 399 prev_pcb.arch_info.force_unlock(); 400 next_pcb.arch_info.force_unlock(); 401 } 402 403 /// 如果目标进程正在目标CPU上运行，那么就让这个cpu陷入内核态 404 /// 405 /// ## 参数 406 /// 407 /// - `pcb` : 进程的pcb 408 #[allow(dead_code)] 409 pub fn kick(pcb: &Arc<ProcessControlBlock>) { 410 ProcessManager::current_pcb().preempt_disable(); 411 let cpu_id = pcb.sched_info().on_cpu(); 412 413 if let Some(cpu_id) = cpu_id { 414 let cpu_id = cpu_id; 415 416 if pcb.pid() == CPU_EXECUTING.get(cpu_id) { 417 kick_cpu(cpu_id).expect("ProcessManager::kick(): Failed to kick cpu"); 418 } 419 } 420 421 ProcessManager::current_pcb().preempt_enable(); 422 } 423 } 424 425 /// 上下文切换的钩子函数,当这个函数return的时候,将会发生上下文切换 426 pub unsafe extern "sysv64" fn switch_finish_hook() { 427 ProcessManager::switch_finish_hook(); 428 } 429 430 int_like!(Pid, AtomicPid, usize, AtomicUsize); 431 432 impl Hash for Pid { 433 fn hash<H: Hasher>(&self, state: &mut H) { 434 self.0.hash(state); 435 } 436 } 437 438 impl Pid { 439 pub fn to_string(&self) -> String { 440 self.0.to_string() 441 } 442 } 443 444 #[derive(Debug, Clone, Copy, PartialEq, Eq)] 445 pub enum ProcessState { 446 /// The process is running on a CPU or in a run queue. 447 Runnable, 448 /// The process is waiting for an event to occur. 449 /// 其中的bool表示该等待过程是否可以被打断。 450 /// - 如果该bool为true,那么，硬件中断/信号/其他系统事件都可以打断该等待过程，使得该进程重新进入Runnable状态。 451 /// - 如果该bool为false,那么，这个进程必须被显式的唤醒，才能重新进入Runnable状态。 452 Blocked(bool), 453 /// 进程被信号终止 454 Stopped, 455 /// 进程已经退出，usize表示进程的退出码 456 Exited(usize), 457 } 458 459 #[allow(dead_code)] 460 impl ProcessState { 461 #[inline(always)] 462 pub fn is_runnable(&self) -> bool { 463 return matches!(self, ProcessState::Runnable); 464 } 465 466 #[inline(always)] 467 pub fn is_blocked(&self) -> bool { 468 return matches!(self, ProcessState::Blocked(_)); 469 } 470 471 #[inline(always)] 472 pub fn is_blocked_interruptable(&self) -> bool { 473 return matches!(self, ProcessState::Blocked(true)); 474 } 475 476 #[inline(always)] 477 pub fn is_exited(&self) -> bool { 478 return matches!(self, ProcessState::Exited(_)); 479 } 480 481 /// Returns `true` if the process state is [`Stopped`]. 482 /// 483 /// [`Stopped`]: ProcessState::Stopped 484 #[inline(always)] 485 pub fn is_stopped(&self) -> bool { 486 matches!(self, ProcessState::Stopped) 487 } 488 } 489 490 bitflags! { 491 /// pcb的标志位 492 pub struct ProcessFlags: usize { 493 /// 当前pcb表示一个内核线程 494 const KTHREAD = 1 << 0; 495 /// 当前进程需要被调度 496 const NEED_SCHEDULE = 1 << 1; 497 /// 进程由于vfork而与父进程存在资源共享 498 const VFORK = 1 << 2; 499 /// 进程不可被冻结 500 const NOFREEZE = 1 << 3; 501 /// 进程正在退出 502 const EXITING = 1 << 4; 503 /// 进程由于接收到终止信号唤醒 504 const WAKEKILL = 1 << 5; 505 /// 进程由于接收到信号而退出.(Killed by a signal) 506 const SIGNALED = 1 << 6; 507 /// 进程需要迁移到其他cpu上 508 const NEED_MIGRATE = 1 << 7; 509 } 510 } 511 512 #[derive(Debug)] 513 pub struct ProcessControlBlock { 514 /// 当前进程的pid 515 pid: Pid, 516 /// 当前进程的线程组id（这个值在同一个线程组内永远不变） 517 tgid: Pid, 518 519 basic: RwLock<ProcessBasicInfo>, 520 /// 当前进程的自旋锁持有计数 521 preempt_count: AtomicUsize, 522 523 flags: LockFreeFlags<ProcessFlags>, 524 worker_private: SpinLock<Option<WorkerPrivate>>, 525 /// 进程的内核栈 526 kernel_stack: RwLock<KernelStack>, 527 528 /// 系统调用栈 529 syscall_stack: RwLock<KernelStack>, 530 531 /// 与调度相关的信息 532 sched_info: RwLock<ProcessSchedulerInfo>, 533 /// 与处理器架构相关的信息 534 arch_info: SpinLock<ArchPCBInfo>, 535 /// 与信号处理相关的信息(似乎可以是无锁的) 536 sig_info: RwLock<ProcessSignalInfo>, 537 /// 信号处理结构体 538 sig_struct: SpinLock<SignalStruct>, 539 /// 退出信号S 540 exit_signal: AtomicSignal, 541 542 /// 父进程指针 543 parent_pcb: RwLock<Weak<ProcessControlBlock>>, 544 /// 真实父进程指针 545 real_parent_pcb: RwLock<Weak<ProcessControlBlock>>, 546 547 /// 子进程链表 548 children: RwLock<Vec<Pid>>, 549 550 /// 等待队列 551 wait_queue: WaitQueue, 552 553 /// 线程信息 554 thread: RwLock<ThreadInfo>, 555 } 556 557 impl ProcessControlBlock { 558 /// Generate a new pcb. 559 /// 560 /// ## 参数 561 /// 562 /// - `name` : 进程的名字 563 /// - `kstack` : 进程的内核栈 564 /// 565 /// ## 返回值 566 /// 567 /// 返回一个新的pcb 568 pub fn new(name: String, kstack: KernelStack) -> Arc<Self> { 569 return Self::do_create_pcb(name, kstack, false); 570 } 571 572 /// 创建一个新的idle进程 573 /// 574 /// 请注意，这个函数只能在进程管理初始化的时候调用。 575 pub fn new_idle(cpu_id: u32, kstack: KernelStack) -> Arc<Self> { 576 let name = format!("idle-{}", cpu_id); 577 return Self::do_create_pcb(name, kstack, true); 578 } 579 580 fn do_create_pcb(name: String, kstack: KernelStack, is_idle: bool) -> Arc<Self> { 581 let (pid, ppid, cwd) = if is_idle { 582 (Pid(0), Pid(0), "/".to_string()) 583 } else { 584 ( 585 Self::generate_pid(), 586 ProcessManager::current_pcb().pid(), 587 ProcessManager::current_pcb().basic().cwd(), 588 ) 589 }; 590 591 let basic_info = ProcessBasicInfo::new(Pid(0), ppid, name, cwd, None); 592 let preempt_count = AtomicUsize::new(0); 593 let flags = unsafe { LockFreeFlags::new(ProcessFlags::empty()) }; 594 595 let sched_info = ProcessSchedulerInfo::new(None); 596 let arch_info = SpinLock::new(ArchPCBInfo::new(&kstack)); 597 598 let ppcb: Weak<ProcessControlBlock> = ProcessManager::find(ppid) 599 .map(|p| Arc::downgrade(&p)) 600 .unwrap_or_else(|| Weak::new()); 601 602 let pcb = Self { 603 pid, 604 tgid: pid, 605 basic: basic_info, 606 preempt_count, 607 flags, 608 kernel_stack: RwLock::new(kstack), 609 syscall_stack: RwLock::new(KernelStack::new().unwrap()), 610 worker_private: SpinLock::new(None), 611 sched_info, 612 arch_info, 613 sig_info: RwLock::new(ProcessSignalInfo::default()), 614 sig_struct: SpinLock::new(SignalStruct::default()), 615 exit_signal: AtomicSignal::new(Signal::SIGCHLD), 616 parent_pcb: RwLock::new(ppcb.clone()), 617 real_parent_pcb: RwLock::new(ppcb), 618 children: RwLock::new(Vec::new()), 619 wait_queue: WaitQueue::INIT, 620 thread: RwLock::new(ThreadInfo::new()), 621 }; 622 623 // 初始化系统调用栈 624 pcb.arch_info 625 .lock() 626 .init_syscall_stack(&pcb.syscall_stack.read()); 627 628 let pcb = Arc::new(pcb); 629 630 // 设置进程的arc指针到内核栈和系统调用栈的最低地址处 631 unsafe { 632 pcb.kernel_stack 633 .write() 634 .set_pcb(Arc::downgrade(&pcb)) 635 .unwrap(); 636 637 pcb.syscall_stack 638 .write() 639 .set_pcb(Arc::downgrade(&pcb)) 640 .unwrap() 641 }; 642 643 // 将当前pcb加入父进程的子进程哈希表中 644 if pcb.pid() > Pid(1) { 645 if let Some(ppcb_arc) = pcb.parent_pcb.read().upgrade() { 646 let mut children = ppcb_arc.children.write(); 647 children.push(pcb.pid()); 648 } else { 649 panic!("parent pcb is None"); 650 } 651 } 652 653 return pcb; 654 } 655 656 /// 生成一个新的pid 657 #[inline(always)] 658 fn generate_pid() -> Pid { 659 static NEXT_PID: AtomicPid = AtomicPid::new(Pid(1)); 660 return NEXT_PID.fetch_add(Pid(1), Ordering::SeqCst); 661 } 662 663 /// 返回当前进程的锁持有计数 664 #[inline(always)] 665 pub fn preempt_count(&self) -> usize { 666 return self.preempt_count.load(Ordering::SeqCst); 667 } 668 669 /// 增加当前进程的锁持有计数 670 #[inline(always)] 671 pub fn preempt_disable(&self) { 672 self.preempt_count.fetch_add(1, Ordering::SeqCst); 673 } 674 675 /// 减少当前进程的锁持有计数 676 #[inline(always)] 677 pub fn preempt_enable(&self) { 678 self.preempt_count.fetch_sub(1, Ordering::SeqCst); 679 } 680 681 #[inline(always)] 682 pub unsafe fn set_preempt_count(&self, count: usize) { 683 self.preempt_count.store(count, Ordering::SeqCst); 684 } 685 686 #[inline(always)] 687 pub fn flags(&self) -> &mut ProcessFlags { 688 return self.flags.get_mut(); 689 } 690 691 #[inline(always)] 692 pub fn basic(&self) -> RwLockReadGuard<ProcessBasicInfo> { 693 return self.basic.read(); 694 } 695 696 #[inline(always)] 697 pub fn set_name(&self, name: String) { 698 self.basic.write().set_name(name); 699 } 700 701 #[inline(always)] 702 pub fn basic_mut(&self) -> RwLockWriteGuard<ProcessBasicInfo> { 703 return self.basic.write(); 704 } 705 706 #[inline(always)] 707 pub fn arch_info(&self) -> SpinLockGuard<ArchPCBInfo> { 708 return self.arch_info.lock(); 709 } 710 711 #[inline(always)] 712 pub fn arch_info_irqsave(&self) -> SpinLockGuard<ArchPCBInfo> { 713 return self.arch_info.lock_irqsave(); 714 } 715 716 #[inline(always)] 717 pub fn kernel_stack(&self) -> RwLockReadGuard<KernelStack> { 718 return self.kernel_stack.read(); 719 } 720 721 #[inline(always)] 722 #[allow(dead_code)] 723 pub fn kernel_stack_mut(&self) -> RwLockWriteGuard<KernelStack> { 724 return self.kernel_stack.write(); 725 } 726 727 #[inline(always)] 728 pub fn sched_info(&self) -> RwLockReadGuard<ProcessSchedulerInfo> { 729 return self.sched_info.read(); 730 } 731 732 #[inline(always)] 733 pub fn try_sched_info(&self, times: u8) -> Option<RwLockReadGuard<ProcessSchedulerInfo>> { 734 for _ in 0..times { 735 if let Some(r) = self.sched_info.try_read() { 736 return Some(r); 737 } 738 } 739 740 return None; 741 } 742 743 #[allow(dead_code)] 744 #[inline(always)] 745 pub fn sched_info_irqsave(&self) -> RwLockReadGuard<ProcessSchedulerInfo> { 746 return self.sched_info.read_irqsave(); 747 } 748 749 #[inline(always)] 750 pub fn sched_info_try_upgradeable_irqsave( 751 &self, 752 times: u8, 753 ) -> Option<RwLockUpgradableGuard<ProcessSchedulerInfo>> { 754 for _ in 0..times { 755 if let Some(r) = self.sched_info.try_upgradeable_read_irqsave() { 756 return Some(r); 757 } 758 } 759 return None; 760 } 761 762 #[inline(always)] 763 pub fn sched_info_mut(&self) -> RwLockWriteGuard<ProcessSchedulerInfo> { 764 return self.sched_info.write(); 765 } 766 767 #[inline(always)] 768 pub fn sched_info_mut_irqsave(&self) -> RwLockWriteGuard<ProcessSchedulerInfo> { 769 return self.sched_info.write_irqsave(); 770 } 771 772 #[inline(always)] 773 pub fn worker_private(&self) -> SpinLockGuard<Option<WorkerPrivate>> { 774 return self.worker_private.lock(); 775 } 776 777 #[inline(always)] 778 pub fn pid(&self) -> Pid { 779 return self.pid; 780 } 781 782 #[inline(always)] 783 pub fn tgid(&self) -> Pid { 784 return self.tgid; 785 } 786 787 /// 获取文件描述符表的Arc指针 788 #[inline(always)] 789 pub fn fd_table(&self) -> Arc<RwLock<FileDescriptorVec>> { 790 return self.basic.read().fd_table().unwrap(); 791 } 792 793 /// 根据文件描述符序号，获取socket对象的Arc指针 794 /// 795 /// ## 参数 796 /// 797 /// - `fd` 文件描述符序号 798 /// 799 /// ## 返回值 800 /// 801 /// Option(&mut Box<dyn Socket>) socket对象的可变引用. 如果文件描述符不是socket，那么返回None 802 pub fn get_socket(&self, fd: i32) -> Option<Arc<SocketInode>> { 803 let binding = ProcessManager::current_pcb().fd_table(); 804 let fd_table_guard = binding.read(); 805 806 let f = fd_table_guard.get_file_by_fd(fd)?; 807 drop(fd_table_guard); 808 809 let guard = f.lock(); 810 if guard.file_type() != FileType::Socket { 811 return None; 812 } 813 let socket: Arc<SocketInode> = guard 814 .inode() 815 .downcast_arc::<SocketInode>() 816 .expect("Not a socket inode"); 817 return Some(socket); 818 } 819 820 /// 当前进程退出时,让初始进程收养所有子进程 821 unsafe fn adopt_childen(&self) -> Result<(), SystemError> { 822 match ProcessManager::find(Pid(1)) { 823 Some(init_pcb) => { 824 let childen_guard = self.children.write(); 825 let mut init_childen_guard = init_pcb.children.write(); 826 827 childen_guard.iter().for_each(|pid| { 828 init_childen_guard.push(*pid); 829 }); 830 831 return Ok(()); 832 } 833 _ => Err(SystemError::ECHILD), 834 } 835 } 836 837 /// 生成进程的名字 838 pub fn generate_name(program_path: &str, args: &Vec<String>) -> String { 839 let mut name = program_path.to_string(); 840 for arg in args { 841 name.push_str(arg); 842 name.push(' '); 843 } 844 return name; 845 } 846 847 pub fn sig_info(&self) -> RwLockReadGuard<ProcessSignalInfo> { 848 self.sig_info.read() 849 } 850 851 pub fn try_siginfo(&self, times: u8) -> Option<RwLockReadGuard<ProcessSignalInfo>> { 852 for _ in 0..times { 853 if let Some(r) = self.sig_info.try_read() { 854 return Some(r); 855 } 856 } 857 858 return None; 859 } 860 861 pub fn sig_info_mut(&self) -> RwLockWriteGuard<ProcessSignalInfo> { 862 self.sig_info.write() 863 } 864 865 pub fn try_siginfo_mut(&self, times: u8) -> Option<RwLockWriteGuard<ProcessSignalInfo>> { 866 for _ in 0..times { 867 if let Some(r) = self.sig_info.try_write() { 868 return Some(r); 869 } 870 } 871 872 return None; 873 } 874 875 pub fn sig_struct(&self) -> SpinLockGuard<SignalStruct> { 876 self.sig_struct.lock() 877 } 878 879 pub fn try_sig_struct_irq(&self, times: u8) -> Option<SpinLockGuard<SignalStruct>> { 880 for _ in 0..times { 881 if let Ok(r) = self.sig_struct.try_lock_irqsave() { 882 return Some(r); 883 } 884 } 885 886 return None; 887 } 888 889 pub fn sig_struct_irq(&self) -> SpinLockGuard<SignalStruct> { 890 self.sig_struct.lock_irqsave() 891 } 892 } 893 894 impl Drop for ProcessControlBlock { 895 fn drop(&mut self) { 896 // 在ProcFS中,解除进程的注册 897 procfs_unregister_pid(self.pid()) 898 .unwrap_or_else(|e| panic!("procfs_unregister_pid failed: error: {e:?}")); 899 900 if let Some(ppcb) = self.parent_pcb.read().upgrade() { 901 ppcb.children.write().drain_filter(|pid| *pid == self.pid()); 902 } 903 } 904 } 905 906 /// 线程信息 907 #[derive(Debug)] 908 pub struct ThreadInfo { 909 // 来自用户空间记录用户线程id的地址，在该线程结束时将该地址置0以通知父进程 910 clear_child_tid: Option<VirtAddr>, 911 set_child_tid: Option<VirtAddr>, 912 913 vfork_done: Option<Arc<Completion>>, 914 /// 线程组的组长 915 group_leader: Weak<ProcessControlBlock>, 916 } 917 918 impl ThreadInfo { 919 pub fn new() -> Self { 920 Self { 921 clear_child_tid: None, 922 set_child_tid: None, 923 vfork_done: None, 924 group_leader: Weak::default(), 925 } 926 } 927 928 pub fn group_leader(&self) -> Option<Arc<ProcessControlBlock>> { 929 return self.group_leader.upgrade(); 930 } 931 } 932 933 /// 进程的基本信息 934 /// 935 /// 这个结构体保存进程的基本信息，主要是那些不会随着进程的运行而经常改变的信息。 936 #[derive(Debug)] 937 pub struct ProcessBasicInfo { 938 /// 当前进程的进程组id 939 pgid: Pid, 940 /// 当前进程的父进程的pid 941 ppid: Pid, 942 /// 进程的名字 943 name: String, 944 945 /// 当前进程的工作目录 946 cwd: String, 947 948 /// 用户地址空间 949 user_vm: Option<Arc<AddressSpace>>, 950 951 /// 文件描述符表 952 fd_table: Option<Arc<RwLock<FileDescriptorVec>>>, 953 } 954 955 impl ProcessBasicInfo { 956 pub fn new( 957 pgid: Pid, 958 ppid: Pid, 959 name: String, 960 cwd: String, 961 user_vm: Option<Arc<AddressSpace>>, 962 ) -> RwLock<Self> { 963 let fd_table = Arc::new(RwLock::new(FileDescriptorVec::new())); 964 return RwLock::new(Self { 965 pgid, 966 ppid, 967 name, 968 cwd, 969 user_vm, 970 fd_table: Some(fd_table), 971 }); 972 } 973 974 pub fn pgid(&self) -> Pid { 975 return self.pgid; 976 } 977 978 pub fn ppid(&self) -> Pid { 979 return self.ppid; 980 } 981 982 pub fn name(&self) -> &str { 983 return &self.name; 984 } 985 986 pub fn set_name(&mut self, name: String) { 987 self.name = name; 988 } 989 990 pub fn cwd(&self) -> String { 991 return self.cwd.clone(); 992 } 993 pub fn set_cwd(&mut self, path: String) { 994 return self.cwd = path; 995 } 996 997 pub fn user_vm(&self) -> Option<Arc<AddressSpace>> { 998 return self.user_vm.clone(); 999 } 1000 1001 pub unsafe fn set_user_vm(&mut self, user_vm: Option<Arc<AddressSpace>>) { 1002 self.user_vm = user_vm; 1003 } 1004 1005 pub fn fd_table(&self) -> Option<Arc<RwLock<FileDescriptorVec>>> { 1006 return self.fd_table.clone(); 1007 } 1008 1009 pub fn set_fd_table(&mut self, fd_table: Option<Arc<RwLock<FileDescriptorVec>>>) { 1010 self.fd_table = fd_table; 1011 } 1012 } 1013 1014 #[derive(Debug)] 1015 pub struct ProcessSchedulerInfo { 1016 /// 当前进程所在的cpu 1017 on_cpu: AtomicI32, 1018 /// 如果当前进程等待被迁移到另一个cpu核心上（也就是flags中的PF_NEED_MIGRATE被置位）， 1019 /// 该字段存储要被迁移到的目标处理器核心号 1020 migrate_to: AtomicI32, 1021 1022 /// 当前进程的状态 1023 state: ProcessState, 1024 /// 进程的调度策略 1025 sched_policy: SchedPolicy, 1026 /// 进程的调度优先级 1027 priority: SchedPriority, 1028 /// 当前进程的虚拟运行时间 1029 virtual_runtime: AtomicIsize, 1030 /// 由实时调度器管理的时间片 1031 rt_time_slice: AtomicIsize, 1032 } 1033 1034 impl ProcessSchedulerInfo { 1035 pub fn new(on_cpu: Option<u32>) -> RwLock<Self> { 1036 let cpu_id = match on_cpu { 1037 Some(cpu_id) => cpu_id as i32, 1038 None => -1, 1039 }; 1040 return RwLock::new(Self { 1041 on_cpu: AtomicI32::new(cpu_id), 1042 migrate_to: AtomicI32::new(-1), 1043 state: ProcessState::Blocked(false), 1044 sched_policy: SchedPolicy::CFS, 1045 virtual_runtime: AtomicIsize::new(0), 1046 rt_time_slice: AtomicIsize::new(0), 1047 priority: SchedPriority::new(100).unwrap(), 1048 }); 1049 } 1050 1051 pub fn on_cpu(&self) -> Option<u32> { 1052 let on_cpu = self.on_cpu.load(Ordering::SeqCst); 1053 if on_cpu == -1 { 1054 return None; 1055 } else { 1056 return Some(on_cpu as u32); 1057 } 1058 } 1059 1060 pub fn set_on_cpu(&self, on_cpu: Option<u32>) { 1061 if let Some(cpu_id) = on_cpu { 1062 self.on_cpu.store(cpu_id as i32, Ordering::SeqCst); 1063 } else { 1064 self.on_cpu.store(-1, Ordering::SeqCst); 1065 } 1066 } 1067 1068 pub fn migrate_to(&self) -> Option<u32> { 1069 let migrate_to = self.migrate_to.load(Ordering::SeqCst); 1070 if migrate_to == -1 { 1071 return None; 1072 } else { 1073 return Some(migrate_to as u32); 1074 } 1075 } 1076 1077 pub fn set_migrate_to(&self, migrate_to: Option<u32>) { 1078 if let Some(data) = migrate_to { 1079 self.migrate_to.store(data as i32, Ordering::SeqCst); 1080 } else { 1081 self.migrate_to.store(-1, Ordering::SeqCst) 1082 } 1083 } 1084 1085 pub fn state(&self) -> ProcessState { 1086 return self.state; 1087 } 1088 1089 pub fn set_state(&mut self, state: ProcessState) { 1090 self.state = state; 1091 } 1092 1093 pub fn policy(&self) -> SchedPolicy { 1094 return self.sched_policy; 1095 } 1096 1097 pub fn virtual_runtime(&self) -> isize { 1098 return self.virtual_runtime.load(Ordering::SeqCst); 1099 } 1100 1101 pub fn set_virtual_runtime(&self, virtual_runtime: isize) { 1102 self.virtual_runtime 1103 .store(virtual_runtime, Ordering::SeqCst); 1104 } 1105 pub fn increase_virtual_runtime(&self, delta: isize) { 1106 self.virtual_runtime.fetch_add(delta, Ordering::SeqCst); 1107 } 1108 1109 pub fn rt_time_slice(&self) -> isize { 1110 return self.rt_time_slice.load(Ordering::SeqCst); 1111 } 1112 1113 pub fn set_rt_time_slice(&self, rt_time_slice: isize) { 1114 self.rt_time_slice.store(rt_time_slice, Ordering::SeqCst); 1115 } 1116 1117 pub fn increase_rt_time_slice(&self, delta: isize) { 1118 self.rt_time_slice.fetch_add(delta, Ordering::SeqCst); 1119 } 1120 1121 pub fn priority(&self) -> SchedPriority { 1122 return self.priority; 1123 } 1124 } 1125 1126 #[derive(Debug, Clone)] 1127 pub struct KernelStack { 1128 stack: Option<AlignedBox<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>>, 1129 /// 标记该内核栈是否可以被释放 1130 can_be_freed: bool, 1131 } 1132 1133 impl KernelStack { 1134 pub const SIZE: usize = 0x4000; 1135 pub const ALIGN: usize = 0x4000; 1136 1137 pub fn new() -> Result<Self, SystemError> { 1138 return Ok(Self { 1139 stack: Some( 1140 AlignedBox::<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>::new_zeroed()?, 1141 ), 1142 can_be_freed: true, 1143 }); 1144 } 1145 1146 /// 根据已有的空间，构造一个内核栈结构体 1147 /// 1148 /// 仅仅用于BSP启动时，为idle进程构造内核栈。其他时候使用这个函数，很可能造成错误！ 1149 pub unsafe fn from_existed(base: VirtAddr) -> Result<Self, SystemError> { 1150 if base.is_null() || base.check_aligned(Self::ALIGN) == false { 1151 return Err(SystemError::EFAULT); 1152 } 1153 1154 return Ok(Self { 1155 stack: Some( 1156 AlignedBox::<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>::new_unchecked( 1157 base.data() as *mut [u8; KernelStack::SIZE], 1158 ), 1159 ), 1160 can_be_freed: false, 1161 }); 1162 } 1163 1164 /// 返回内核栈的起始虚拟地址(低地址) 1165 pub fn start_address(&self) -> VirtAddr { 1166 return VirtAddr::new(self.stack.as_ref().unwrap().as_ptr() as usize); 1167 } 1168 1169 /// 返回内核栈的结束虚拟地址(高地址)(不包含该地址) 1170 pub fn stack_max_address(&self) -> VirtAddr { 1171 return VirtAddr::new(self.stack.as_ref().unwrap().as_ptr() as usize + Self::SIZE); 1172 } 1173 1174 pub unsafe fn set_pcb(&mut self, pcb: Weak<ProcessControlBlock>) -> Result<(), SystemError> { 1175 // 将一个Weak<ProcessControlBlock>放到内核栈的最低地址处 1176 let p: *const ProcessControlBlock = Weak::into_raw(pcb); 1177 let stack_bottom_ptr = self.start_address().data() as *mut *const ProcessControlBlock; 1178 1179 // 如果内核栈的最低地址处已经有了一个pcb，那么，这里就不再设置,直接返回错误 1180 if unlikely(unsafe { !(*stack_bottom_ptr).is_null() }) { 1181 kerror!("kernel stack bottom is not null: {:p}", *stack_bottom_ptr); 1182 return Err(SystemError::EPERM); 1183 } 1184 // 将pcb的地址放到内核栈的最低地址处 1185 unsafe { 1186 *stack_bottom_ptr = p; 1187 } 1188 1189 return Ok(()); 1190 } 1191 1192 /// 清除内核栈的pcb指针 1193 /// 1194 /// ## 参数 1195 /// 1196 /// - `force` : 如果为true,那么，即使该内核栈的pcb指针不为null，也会被强制清除而不处理Weak指针问题 1197 pub unsafe fn clear_pcb(&mut self, force: bool) { 1198 let stack_bottom_ptr = self.start_address().data() as *mut *const ProcessControlBlock; 1199 if unlikely(unsafe { (*stack_bottom_ptr).is_null() }) { 1200 return; 1201 } 1202 1203 if !force { 1204 let pcb_ptr: Weak<ProcessControlBlock> = Weak::from_raw(*stack_bottom_ptr); 1205 drop(pcb_ptr); 1206 } 1207 1208 *stack_bottom_ptr = core::ptr::null(); 1209 } 1210 1211 /// 返回指向当前内核栈pcb的Arc指针 1212 #[allow(dead_code)] 1213 pub unsafe fn pcb(&self) -> Option<Arc<ProcessControlBlock>> { 1214 // 从内核栈的最低地址处取出pcb的地址 1215 let p = self.stack.as_ref().unwrap().as_ptr() as *const ProcessControlBlock; 1216 if unlikely(p.is_null()) { 1217 return None; 1218 } 1219 1220 // 为了防止内核栈的pcb指针被释放，这里需要将其包装一下，使得Arc的drop不会被调用 1221 let weak_wrapper: ManuallyDrop<Weak<ProcessControlBlock>> = 1222 ManuallyDrop::new(Weak::from_raw(p)); 1223 1224 let new_arc: Arc<ProcessControlBlock> = weak_wrapper.upgrade()?; 1225 return Some(new_arc); 1226 } 1227 } 1228 1229 impl Drop for KernelStack { 1230 fn drop(&mut self) { 1231 if !self.stack.is_none() { 1232 let pcb_ptr: Weak<ProcessControlBlock> = unsafe { 1233 Weak::from_raw(self.stack.as_ref().unwrap().as_ptr() as *const ProcessControlBlock) 1234 }; 1235 drop(pcb_ptr); 1236 } 1237 // 如果该内核栈不可以被释放，那么，这里就forget，不调用AlignedBox的drop函数 1238 if !self.can_be_freed { 1239 let bx = self.stack.take(); 1240 core::mem::forget(bx); 1241 } 1242 } 1243 } 1244 1245 pub fn process_init() { 1246 ProcessManager::init(); 1247 } 1248 1249 #[derive(Debug)] 1250 pub struct ProcessSignalInfo { 1251 // 当前进程 1252 sig_block: SigSet, 1253 // sig_pending 中存储当前线程要处理的信号 1254 sig_pending: SigPending, 1255 // sig_shared_pending 中存储当前线程所属进程要处理的信号 1256 sig_shared_pending: SigPending, 1257 } 1258 1259 impl ProcessSignalInfo { 1260 pub fn sig_block(&self) -> &SigSet { 1261 &self.sig_block 1262 } 1263 1264 pub fn sig_pending(&self) -> &SigPending { 1265 &self.sig_pending 1266 } 1267 1268 pub fn sig_pending_mut(&mut self) -> &mut SigPending { 1269 &mut self.sig_pending 1270 } 1271 1272 pub fn sig_block_mut(&mut self) -> &mut SigSet { 1273 &mut self.sig_block 1274 } 1275 1276 pub fn sig_shared_pending_mut(&mut self) -> &mut SigPending { 1277 &mut self.sig_shared_pending 1278 } 1279 1280 pub fn sig_shared_pending(&self) -> &SigPending { 1281 &self.sig_shared_pending 1282 } 1283 1284 /// 从 pcb 的 siginfo中取出下一个要处理的信号，先处理线程信号，再处理进程信号 1285 /// 1286 /// ## 参数 1287 /// 1288 /// - `sig_mask` 被忽略掉的信号 1289 /// 1290 pub fn dequeue_signal(&mut self, sig_mask: &SigSet) -> (Signal, Option<SigInfo>) { 1291 let res = self.sig_pending.dequeue_signal(sig_mask); 1292 if res.0 != Signal::INVALID { 1293 return res; 1294 } else { 1295 return self.sig_shared_pending.dequeue_signal(sig_mask); 1296 } 1297 } 1298 } 1299 1300 impl Default for ProcessSignalInfo { 1301 fn default() -> Self { 1302 Self { 1303 sig_block: SigSet::empty(), 1304 sig_pending: SigPending::default(), 1305 sig_shared_pending: SigPending::default(), 1306 } 1307 } 1308 } 1309