1 use core::{ 2 fmt, 3 hash::Hash, 4 hint::spin_loop, 5 intrinsics::{likely, unlikely}, 6 mem::ManuallyDrop, 7 sync::atomic::{compiler_fence, fence, AtomicBool, AtomicUsize, Ordering}, 8 }; 9 10 use alloc::{ 11 ffi::CString, 12 string::{String, ToString}, 13 sync::{Arc, Weak}, 14 vec::Vec, 15 }; 16 use cred::INIT_CRED; 17 use hashbrown::HashMap; 18 use log::{debug, error, info, warn}; 19 use system_error::SystemError; 20 21 use crate::{ 22 arch::{ 23 cpu::current_cpu_id, 24 ipc::signal::{AtomicSignal, SigSet, Signal}, 25 process::ArchPCBInfo, 26 CurrentIrqArch, 27 }, 28 driver::tty::tty_core::TtyCore, 29 exception::InterruptArch, 30 filesystem::{ 31 procfs::procfs_unregister_pid, 32 vfs::{file::FileDescriptorVec, FileType}, 33 }, 34 ipc::signal_types::{SigInfo, SigPending, SignalStruct}, 35 libs::{ 36 align::AlignedBox, 37 casting::DowncastArc, 38 futex::{ 39 constant::{FutexFlag, FUTEX_BITSET_MATCH_ANY}, 40 futex::{Futex, RobustListHead}, 41 }, 42 lock_free_flags::LockFreeFlags, 43 rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard}, 44 spinlock::{SpinLock, SpinLockGuard}, 45 wait_queue::WaitQueue, 46 }, 47 mm::{ 48 percpu::{PerCpu, PerCpuVar}, 49 set_IDLE_PROCESS_ADDRESS_SPACE, 50 ucontext::AddressSpace, 51 VirtAddr, 52 }, 53 namespaces::{mnt_namespace::FsStruct, pid_namespace::PidStrcut, NsProxy}, 54 net::socket::SocketInode, 55 sched::{ 56 completion::Completion, cpu_rq, fair::FairSchedEntity, prio::MAX_PRIO, DequeueFlag, 57 EnqueueFlag, OnRq, SchedMode, WakeupFlags, __schedule, 58 }, 59 smp::{ 60 core::smp_get_processor_id, 61 cpu::{AtomicProcessorId, ProcessorId}, 62 kick_cpu, 63 }, 64 syscall::{user_access::clear_user, Syscall}, 65 }; 66 use timer::AlarmTimer; 67 68 use self::{cred::Cred, kthread::WorkerPrivate}; 69 70 pub mod abi; 71 pub mod c_adapter; 72 pub mod cred; 73 pub mod exec; 74 pub mod exit; 75 pub mod fork; 76 pub mod idle; 77 pub mod kthread; 78 pub mod pid; 79 pub mod resource; 80 pub mod stdio; 81 pub mod syscall; 82 pub mod timer; 83 pub mod utils; 84 85 /// 系统中所有进程的pcb 86 static ALL_PROCESS: SpinLock<Option<HashMap<Pid, Arc<ProcessControlBlock>>>> = SpinLock::new(None); 87 88 pub static mut PROCESS_SWITCH_RESULT: Option<PerCpuVar<SwitchResult>> = None; 89 90 /// 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 91 static mut __PROCESS_MANAGEMENT_INIT_DONE: bool = false; 92 93 pub struct SwitchResult { 94 pub prev_pcb: Option<Arc<ProcessControlBlock>>, 95 pub next_pcb: Option<Arc<ProcessControlBlock>>, 96 } 97 98 impl SwitchResult { 99 pub fn new() -> Self { 100 Self { 101 prev_pcb: None, 102 next_pcb: None, 103 } 104 } 105 } 106 107 #[derive(Debug)] 108 pub struct ProcessManager; 109 impl ProcessManager { 110 #[inline(never)] 111 fn init() { 112 static INIT_FLAG: AtomicBool = AtomicBool::new(false); 113 if INIT_FLAG 114 .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst) 115 .is_err() 116 { 117 panic!("ProcessManager has been initialized!"); 118 } 119 120 unsafe { 121 compiler_fence(Ordering::SeqCst); 122 debug!("To create address space for INIT process."); 123 // test_buddy(); 124 set_IDLE_PROCESS_ADDRESS_SPACE( 125 AddressSpace::new(true).expect("Failed to create address space for INIT process."), 126 ); 127 debug!("INIT process address space created."); 128 compiler_fence(Ordering::SeqCst); 129 }; 130 131 ALL_PROCESS.lock_irqsave().replace(HashMap::new()); 132 Self::init_switch_result(); 133 Self::arch_init(); 134 debug!("process arch init done."); 135 Self::init_idle(); 136 debug!("process idle init done."); 137 138 unsafe { __PROCESS_MANAGEMENT_INIT_DONE = true }; 139 info!("Process Manager initialized."); 140 } 141 142 fn init_switch_result() { 143 let mut switch_res_vec: Vec<SwitchResult> = Vec::new(); 144 for _ in 0..PerCpu::MAX_CPU_NUM { 145 switch_res_vec.push(SwitchResult::new()); 146 } 147 unsafe { 148 PROCESS_SWITCH_RESULT = Some(PerCpuVar::new(switch_res_vec).unwrap()); 149 } 150 } 151 152 /// 判断进程管理器是否已经初始化完成 153 #[allow(dead_code)] 154 pub fn initialized() -> bool { 155 unsafe { __PROCESS_MANAGEMENT_INIT_DONE } 156 } 157 158 /// 获取当前进程的pcb 159 pub fn current_pcb() -> Arc<ProcessControlBlock> { 160 if unlikely(unsafe { !__PROCESS_MANAGEMENT_INIT_DONE }) { 161 error!("unsafe__PROCESS_MANAGEMENT_INIT_DONE == false"); 162 loop { 163 spin_loop(); 164 } 165 } 166 return ProcessControlBlock::arch_current_pcb(); 167 } 168 169 /// 获取当前进程的pid 170 /// 171 /// 如果进程管理器未初始化完成，那么返回0 172 pub fn current_pid() -> Pid { 173 if unlikely(unsafe { !__PROCESS_MANAGEMENT_INIT_DONE }) { 174 return Pid(0); 175 } 176 177 return ProcessManager::current_pcb().pid(); 178 } 179 180 /// 增加当前进程的锁持有计数 181 #[inline(always)] 182 pub fn preempt_disable() { 183 if likely(unsafe { __PROCESS_MANAGEMENT_INIT_DONE }) { 184 ProcessManager::current_pcb().preempt_disable(); 185 } 186 } 187 188 /// 减少当前进程的锁持有计数 189 #[inline(always)] 190 pub fn preempt_enable() { 191 if likely(unsafe { __PROCESS_MANAGEMENT_INIT_DONE }) { 192 ProcessManager::current_pcb().preempt_enable(); 193 } 194 } 195 196 /// 根据pid获取进程的pcb 197 /// 198 /// ## 参数 199 /// 200 /// - `pid` : 进程的pid 201 /// 202 /// ## 返回值 203 /// 204 /// 如果找到了对应的进程，那么返回该进程的pcb，否则返回None 205 pub fn find(pid: Pid) -> Option<Arc<ProcessControlBlock>> { 206 return ALL_PROCESS.lock_irqsave().as_ref()?.get(&pid).cloned(); 207 } 208 209 /// 向系统中添加一个进程的pcb 210 /// 211 /// ## 参数 212 /// 213 /// - `pcb` : 进程的pcb 214 /// 215 /// ## 返回值 216 /// 217 /// 无 218 pub fn add_pcb(pcb: Arc<ProcessControlBlock>) { 219 ALL_PROCESS 220 .lock_irqsave() 221 .as_mut() 222 .unwrap() 223 .insert(pcb.pid(), pcb.clone()); 224 } 225 226 /// 唤醒一个进程 227 pub fn wakeup(pcb: &Arc<ProcessControlBlock>) -> Result<(), SystemError> { 228 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 229 let state = pcb.sched_info().inner_lock_read_irqsave().state(); 230 if state.is_blocked() { 231 let mut writer = pcb.sched_info().inner_lock_write_irqsave(); 232 let state = writer.state(); 233 if state.is_blocked() { 234 writer.set_state(ProcessState::Runnable); 235 writer.set_wakeup(); 236 237 // avoid deadlock 238 drop(writer); 239 240 let rq = 241 cpu_rq(pcb.sched_info().on_cpu().unwrap_or(current_cpu_id()).data() as usize); 242 243 let (rq, _guard) = rq.self_lock(); 244 rq.update_rq_clock(); 245 rq.activate_task( 246 pcb, 247 EnqueueFlag::ENQUEUE_WAKEUP | EnqueueFlag::ENQUEUE_NOCLOCK, 248 ); 249 250 rq.check_preempt_currnet(pcb, WakeupFlags::empty()); 251 252 // sched_enqueue(pcb.clone(), true); 253 return Ok(()); 254 } else if state.is_exited() { 255 return Err(SystemError::EINVAL); 256 } else { 257 return Ok(()); 258 } 259 } else if state.is_exited() { 260 return Err(SystemError::EINVAL); 261 } else { 262 return Ok(()); 263 } 264 } 265 266 /// 唤醒暂停的进程 267 pub fn wakeup_stop(pcb: &Arc<ProcessControlBlock>) -> Result<(), SystemError> { 268 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 269 let state = pcb.sched_info().inner_lock_read_irqsave().state(); 270 if let ProcessState::Stopped = state { 271 let mut writer = pcb.sched_info().inner_lock_write_irqsave(); 272 let state = writer.state(); 273 if let ProcessState::Stopped = state { 274 writer.set_state(ProcessState::Runnable); 275 // avoid deadlock 276 drop(writer); 277 278 let rq = cpu_rq(pcb.sched_info().on_cpu().unwrap().data() as usize); 279 280 let (rq, _guard) = rq.self_lock(); 281 rq.update_rq_clock(); 282 rq.activate_task( 283 pcb, 284 EnqueueFlag::ENQUEUE_WAKEUP | EnqueueFlag::ENQUEUE_NOCLOCK, 285 ); 286 287 rq.check_preempt_currnet(pcb, WakeupFlags::empty()); 288 289 // sched_enqueue(pcb.clone(), true); 290 return Ok(()); 291 } else if state.is_runnable() { 292 return Ok(()); 293 } else { 294 return Err(SystemError::EINVAL); 295 } 296 } else if state.is_runnable() { 297 return Ok(()); 298 } else { 299 return Err(SystemError::EINVAL); 300 } 301 } 302 303 /// 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 304 /// 305 /// ## 注意 306 /// 307 /// - 进入当前函数之前，不能持有sched_info的锁 308 /// - 进入当前函数之前，必须关闭中断 309 /// - 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 310 pub fn mark_sleep(interruptable: bool) -> Result<(), SystemError> { 311 assert!( 312 !CurrentIrqArch::is_irq_enabled(), 313 "interrupt must be disabled before enter ProcessManager::mark_sleep()" 314 ); 315 let pcb = ProcessManager::current_pcb(); 316 let mut writer = pcb.sched_info().inner_lock_write_irqsave(); 317 if !matches!(writer.state(), ProcessState::Exited(_)) { 318 writer.set_state(ProcessState::Blocked(interruptable)); 319 writer.set_sleep(); 320 pcb.flags().insert(ProcessFlags::NEED_SCHEDULE); 321 fence(Ordering::SeqCst); 322 drop(writer); 323 return Ok(()); 324 } 325 return Err(SystemError::EINTR); 326 } 327 328 /// 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 329 /// 330 /// ## 注意 331 /// 332 /// - 进入当前函数之前，不能持有sched_info的锁 333 /// - 进入当前函数之前，必须关闭中断 334 pub fn mark_stop() -> Result<(), SystemError> { 335 assert!( 336 !CurrentIrqArch::is_irq_enabled(), 337 "interrupt must be disabled before enter ProcessManager::mark_stop()" 338 ); 339 340 let pcb = ProcessManager::current_pcb(); 341 let mut writer = pcb.sched_info().inner_lock_write_irqsave(); 342 if !matches!(writer.state(), ProcessState::Exited(_)) { 343 writer.set_state(ProcessState::Stopped); 344 pcb.flags().insert(ProcessFlags::NEED_SCHEDULE); 345 drop(writer); 346 347 return Ok(()); 348 } 349 return Err(SystemError::EINTR); 350 } 351 /// 当子进程退出后向父进程发送通知 352 fn exit_notify() { 353 let current = ProcessManager::current_pcb(); 354 // 让INIT进程收养所有子进程 355 if current.pid() != Pid(1) { 356 unsafe { 357 current 358 .adopt_childen() 359 .unwrap_or_else(|e| panic!("adopte_childen failed: error: {e:?}")) 360 }; 361 let r = current.parent_pcb.read_irqsave().upgrade(); 362 if r.is_none() { 363 return; 364 } 365 let parent_pcb = r.unwrap(); 366 let r = Syscall::kill(parent_pcb.pid(), Signal::SIGCHLD as i32); 367 if r.is_err() { 368 warn!( 369 "failed to send kill signal to {:?}'s parent pcb {:?}", 370 current.pid(), 371 parent_pcb.pid() 372 ); 373 } 374 // todo: 这里需要向父进程发送SIGCHLD信号 375 // todo: 这里还需要根据线程组的信息，决定信号的发送 376 } 377 } 378 379 /// 退出当前进程 380 /// 381 /// ## 参数 382 /// 383 /// - `exit_code` : 进程的退出码 384 pub fn exit(exit_code: usize) -> ! { 385 // 关中断 386 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 387 let pcb = ProcessManager::current_pcb(); 388 let pid = pcb.pid(); 389 pcb.sched_info 390 .inner_lock_write_irqsave() 391 .set_state(ProcessState::Exited(exit_code)); 392 pcb.wait_queue.wakeup(Some(ProcessState::Blocked(true))); 393 394 let rq = cpu_rq(smp_get_processor_id().data() as usize); 395 let (rq, guard) = rq.self_lock(); 396 rq.deactivate_task( 397 pcb.clone(), 398 DequeueFlag::DEQUEUE_SLEEP | DequeueFlag::DEQUEUE_NOCLOCK, 399 ); 400 drop(guard); 401 402 // 进行进程退出后的工作 403 let thread = pcb.thread.write_irqsave(); 404 if let Some(addr) = thread.set_child_tid { 405 unsafe { clear_user(addr, core::mem::size_of::<i32>()).expect("clear tid failed") }; 406 } 407 408 if let Some(addr) = thread.clear_child_tid { 409 if Arc::strong_count(&pcb.basic().user_vm().expect("User VM Not found")) > 1 { 410 let _ = 411 Futex::futex_wake(addr, FutexFlag::FLAGS_MATCH_NONE, 1, FUTEX_BITSET_MATCH_ANY); 412 } 413 unsafe { clear_user(addr, core::mem::size_of::<i32>()).expect("clear tid failed") }; 414 } 415 416 RobustListHead::exit_robust_list(pcb.clone()); 417 418 // 如果是vfork出来的进程，则需要处理completion 419 if thread.vfork_done.is_some() { 420 thread.vfork_done.as_ref().unwrap().complete_all(); 421 } 422 drop(thread); 423 unsafe { pcb.basic_mut().set_user_vm(None) }; 424 425 // TODO 由于未实现进程组，tty记录的前台进程组等于当前进程，故退出前要置空 426 // 后续相关逻辑需要在SYS_EXIT_GROUP系统调用中实现 427 if let Some(tty) = pcb.sig_info_irqsave().tty() { 428 tty.core().contorl_info_irqsave().pgid = None; 429 } 430 pcb.sig_info_mut().set_tty(None); 431 432 drop(pcb); 433 ProcessManager::exit_notify(); 434 // unsafe { CurrentIrqArch::interrupt_enable() }; 435 __schedule(SchedMode::SM_NONE); 436 error!("pid {pid:?} exited but sched again!"); 437 #[allow(clippy::empty_loop)] 438 loop { 439 spin_loop(); 440 } 441 } 442 443 pub unsafe fn release(pid: Pid) { 444 let pcb = ProcessManager::find(pid); 445 if pcb.is_some() { 446 // let pcb = pcb.unwrap(); 447 // 判断该pcb是否在全局没有任何引用 448 // 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。 449 // 因此目前暂时注释掉，使得能跑 450 // if Arc::strong_count(&pcb) <= 2 { 451 // drop(pcb); 452 // ALL_PROCESS.lock().as_mut().unwrap().remove(&pid); 453 // } else { 454 // // 如果不为1就panic 455 // let msg = format!("pcb '{:?}' is still referenced, strong count={}",pcb.pid(), Arc::strong_count(&pcb)); 456 // error!("{}", msg); 457 // panic!() 458 // } 459 460 ALL_PROCESS.lock_irqsave().as_mut().unwrap().remove(&pid); 461 } 462 } 463 464 /// 上下文切换完成后的钩子函数 465 unsafe fn switch_finish_hook() { 466 // debug!("switch_finish_hook"); 467 let prev_pcb = PROCESS_SWITCH_RESULT 468 .as_mut() 469 .unwrap() 470 .get_mut() 471 .prev_pcb 472 .take() 473 .expect("prev_pcb is None"); 474 let next_pcb = PROCESS_SWITCH_RESULT 475 .as_mut() 476 .unwrap() 477 .get_mut() 478 .next_pcb 479 .take() 480 .expect("next_pcb is None"); 481 482 // 由于进程切换前使用了SpinLockGuard::leak()，所以这里需要手动释放锁 483 fence(Ordering::SeqCst); 484 485 prev_pcb.arch_info.force_unlock(); 486 fence(Ordering::SeqCst); 487 488 next_pcb.arch_info.force_unlock(); 489 fence(Ordering::SeqCst); 490 } 491 492 /// 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 493 /// 494 /// ## 参数 495 /// 496 /// - `pcb` : 进程的pcb 497 #[allow(dead_code)] 498 pub fn kick(pcb: &Arc<ProcessControlBlock>) { 499 ProcessManager::current_pcb().preempt_disable(); 500 let cpu_id = pcb.sched_info().on_cpu(); 501 502 if let Some(cpu_id) = cpu_id { 503 if pcb.pid() == cpu_rq(cpu_id.data() as usize).current().pid() { 504 kick_cpu(cpu_id).expect("ProcessManager::kick(): Failed to kick cpu"); 505 } 506 } 507 508 ProcessManager::current_pcb().preempt_enable(); 509 } 510 } 511 512 /// 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 513 #[cfg(target_arch = "x86_64")] 514 #[inline(never)] 515 pub unsafe extern "sysv64" fn switch_finish_hook() { 516 ProcessManager::switch_finish_hook(); 517 } 518 #[cfg(target_arch = "riscv64")] 519 #[inline(always)] 520 pub unsafe fn switch_finish_hook() { 521 ProcessManager::switch_finish_hook(); 522 } 523 524 int_like!(Pid, AtomicPid, usize, AtomicUsize); 525 526 impl fmt::Display for Pid { 527 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { 528 write!(f, "{}", self.0) 529 } 530 } 531 532 #[derive(Debug, Clone, Copy, PartialEq, Eq)] 533 pub enum ProcessState { 534 /// The process is running on a CPU or in a run queue. 535 Runnable, 536 /// The process is waiting for an event to occur. 537 /// 其中的bool表示该等待过程是否可以被打断。 538 /// - 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。 539 /// - 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。 540 Blocked(bool), 541 /// 进程被信号终止 542 Stopped, 543 /// 进程已经退出，usize表示进程的退出码 544 Exited(usize), 545 } 546 547 #[allow(dead_code)] 548 impl ProcessState { 549 #[inline(always)] 550 pub fn is_runnable(&self) -> bool { 551 return matches!(self, ProcessState::Runnable); 552 } 553 554 #[inline(always)] 555 pub fn is_blocked(&self) -> bool { 556 return matches!(self, ProcessState::Blocked(_)); 557 } 558 559 #[inline(always)] 560 pub fn is_blocked_interruptable(&self) -> bool { 561 return matches!(self, ProcessState::Blocked(true)); 562 } 563 564 /// Returns `true` if the process state is [`Exited`]. 565 #[inline(always)] 566 pub fn is_exited(&self) -> bool { 567 return matches!(self, ProcessState::Exited(_)); 568 } 569 570 /// Returns `true` if the process state is [`Stopped`]. 571 /// 572 /// [`Stopped`]: ProcessState::Stopped 573 #[inline(always)] 574 pub fn is_stopped(&self) -> bool { 575 matches!(self, ProcessState::Stopped) 576 } 577 578 /// Returns exit code if the process state is [`Exited`]. 579 #[inline(always)] 580 pub fn exit_code(&self) -> Option<usize> { 581 match self { 582 ProcessState::Exited(code) => Some(*code), 583 _ => None, 584 } 585 } 586 } 587 588 bitflags! { 589 /// pcb的标志位 590 pub struct ProcessFlags: usize { 591 /// 当前pcb表示一个内核线程 592 const KTHREAD = 1 << 0; 593 /// 当前进程需要被调度 594 const NEED_SCHEDULE = 1 << 1; 595 /// 进程由于vfork而与父进程存在资源共享 596 const VFORK = 1 << 2; 597 /// 进程不可被冻结 598 const NOFREEZE = 1 << 3; 599 /// 进程正在退出 600 const EXITING = 1 << 4; 601 /// 进程由于接收到终止信号唤醒 602 const WAKEKILL = 1 << 5; 603 /// 进程由于接收到信号而退出.(Killed by a signal) 604 const SIGNALED = 1 << 6; 605 /// 进程需要迁移到其他cpu上 606 const NEED_MIGRATE = 1 << 7; 607 /// 随机化的虚拟地址空间，主要用于动态链接器的加载 608 const RANDOMIZE = 1 << 8; 609 } 610 } 611 #[derive(Debug)] 612 pub struct ProcessControlBlock { 613 /// 当前进程的pid 614 pid: Pid, 615 /// 当前进程的线程组id（这个值在同一个线程组内永远不变） 616 tgid: Pid, 617 /// 有关Pid的相关的信息 618 thread_pid: Arc<RwLock<PidStrcut>>, 619 basic: RwLock<ProcessBasicInfo>, 620 /// 当前进程的自旋锁持有计数 621 preempt_count: AtomicUsize, 622 623 flags: LockFreeFlags<ProcessFlags>, 624 worker_private: SpinLock<Option<WorkerPrivate>>, 625 /// 进程的内核栈 626 kernel_stack: RwLock<KernelStack>, 627 628 /// 系统调用栈 629 syscall_stack: RwLock<KernelStack>, 630 631 /// 与调度相关的信息 632 sched_info: ProcessSchedulerInfo, 633 /// 与处理器架构相关的信息 634 arch_info: SpinLock<ArchPCBInfo>, 635 /// 与信号处理相关的信息(似乎可以是无锁的) 636 sig_info: RwLock<ProcessSignalInfo>, 637 /// 信号处理结构体 638 sig_struct: SpinLock<SignalStruct>, 639 /// 退出信号S 640 exit_signal: AtomicSignal, 641 642 /// 父进程指针 643 parent_pcb: RwLock<Weak<ProcessControlBlock>>, 644 /// 真实父进程指针 645 real_parent_pcb: RwLock<Weak<ProcessControlBlock>>, 646 647 /// 子进程链表 648 children: RwLock<Vec<Pid>>, 649 650 /// 等待队列 651 wait_queue: WaitQueue, 652 653 /// 线程信息 654 thread: RwLock<ThreadInfo>, 655 656 /// 进程文件系统的状态 657 fs: Arc<SpinLock<FsStruct>>, 658 659 ///闹钟定时器 660 alarm_timer: SpinLock<Option<AlarmTimer>>, 661 662 /// 进程的robust lock列表 663 robust_list: RwLock<Option<RobustListHead>>, 664 665 /// namespace的指针 666 nsproxy: Arc<RwLock<NsProxy>>, 667 668 /// 进程作为主体的凭证集 669 cred: SpinLock<Cred>, 670 } 671 672 impl ProcessControlBlock { 673 /// Generate a new pcb. 674 /// 675 /// ## 参数 676 /// 677 /// - `name` : 进程的名字 678 /// - `kstack` : 进程的内核栈 679 /// 680 /// ## 返回值 681 /// 682 /// 返回一个新的pcb 683 pub fn new(name: String, kstack: KernelStack) -> Arc<Self> { 684 return Self::do_create_pcb(name, kstack, false); 685 } 686 687 /// 创建一个新的idle进程 688 /// 689 /// 请注意，这个函数只能在进程管理初始化的时候调用。 690 pub fn new_idle(cpu_id: u32, kstack: KernelStack) -> Arc<Self> { 691 let name = format!("idle-{}", cpu_id); 692 return Self::do_create_pcb(name, kstack, true); 693 } 694 695 /// # 函数的功能 696 /// 697 /// 返回此函数是否是内核进程 698 /// 699 /// # 返回值 700 /// 701 /// 若进程是内核进程则返回true 否则返回false 702 pub fn is_kthread(&self) -> bool { 703 return matches!(self.flags(), &mut ProcessFlags::KTHREAD); 704 } 705 706 #[inline(never)] 707 fn do_create_pcb(name: String, kstack: KernelStack, is_idle: bool) -> Arc<Self> { 708 let (pid, ppid, cwd, cred) = if is_idle { 709 let cred = INIT_CRED.clone(); 710 (Pid(0), Pid(0), "/".to_string(), cred) 711 } else { 712 let ppid = ProcessManager::current_pcb().pid(); 713 let mut cred = ProcessManager::current_pcb().cred(); 714 cred.cap_permitted = cred.cap_ambient; 715 cred.cap_effective = cred.cap_ambient; 716 let cwd = ProcessManager::current_pcb().basic().cwd(); 717 (Self::generate_pid(), ppid, cwd, cred) 718 }; 719 720 let basic_info = ProcessBasicInfo::new(Pid(0), ppid, Pid(0), name, cwd, None); 721 let preempt_count = AtomicUsize::new(0); 722 let flags = unsafe { LockFreeFlags::new(ProcessFlags::empty()) }; 723 724 let sched_info = ProcessSchedulerInfo::new(None); 725 let arch_info = SpinLock::new(ArchPCBInfo::new(&kstack)); 726 727 let ppcb: Weak<ProcessControlBlock> = ProcessManager::find(ppid) 728 .map(|p| Arc::downgrade(&p)) 729 .unwrap_or_default(); 730 let pcb = Self { 731 pid, 732 tgid: pid, 733 thread_pid: Arc::new(RwLock::new(PidStrcut::new())), 734 basic: basic_info, 735 preempt_count, 736 flags, 737 kernel_stack: RwLock::new(kstack), 738 syscall_stack: RwLock::new(KernelStack::new().unwrap()), 739 worker_private: SpinLock::new(None), 740 sched_info, 741 arch_info, 742 sig_info: RwLock::new(ProcessSignalInfo::default()), 743 sig_struct: SpinLock::new(SignalStruct::new()), 744 exit_signal: AtomicSignal::new(Signal::SIGCHLD), 745 parent_pcb: RwLock::new(ppcb.clone()), 746 real_parent_pcb: RwLock::new(ppcb), 747 children: RwLock::new(Vec::new()), 748 wait_queue: WaitQueue::default(), 749 thread: RwLock::new(ThreadInfo::new()), 750 fs: Arc::new(SpinLock::new(FsStruct::new())), 751 alarm_timer: SpinLock::new(None), 752 robust_list: RwLock::new(None), 753 nsproxy: Arc::new(RwLock::new(NsProxy::new())), 754 cred: SpinLock::new(cred), 755 }; 756 757 // 初始化系统调用栈 758 #[cfg(target_arch = "x86_64")] 759 pcb.arch_info 760 .lock() 761 .init_syscall_stack(&pcb.syscall_stack.read()); 762 763 let pcb = Arc::new(pcb); 764 765 pcb.sched_info() 766 .sched_entity() 767 .force_mut() 768 .set_pcb(Arc::downgrade(&pcb)); 769 // 设置进程的arc指针到内核栈和系统调用栈的最低地址处 770 unsafe { 771 pcb.kernel_stack 772 .write() 773 .set_pcb(Arc::downgrade(&pcb)) 774 .unwrap(); 775 776 pcb.syscall_stack 777 .write() 778 .set_pcb(Arc::downgrade(&pcb)) 779 .unwrap() 780 }; 781 782 // 将当前pcb加入父进程的子进程哈希表中 783 if pcb.pid() > Pid(1) { 784 if let Some(ppcb_arc) = pcb.parent_pcb.read_irqsave().upgrade() { 785 let mut children = ppcb_arc.children.write_irqsave(); 786 children.push(pcb.pid()); 787 } else { 788 panic!("parent pcb is None"); 789 } 790 } 791 792 return pcb; 793 } 794 795 /// 生成一个新的pid 796 #[inline(always)] 797 fn generate_pid() -> Pid { 798 static NEXT_PID: AtomicPid = AtomicPid::new(Pid(1)); 799 return NEXT_PID.fetch_add(Pid(1), Ordering::SeqCst); 800 } 801 802 /// 返回当前进程的锁持有计数 803 #[inline(always)] 804 pub fn preempt_count(&self) -> usize { 805 return self.preempt_count.load(Ordering::SeqCst); 806 } 807 808 /// 增加当前进程的锁持有计数 809 #[inline(always)] 810 pub fn preempt_disable(&self) { 811 self.preempt_count.fetch_add(1, Ordering::SeqCst); 812 } 813 814 /// 减少当前进程的锁持有计数 815 #[inline(always)] 816 pub fn preempt_enable(&self) { 817 self.preempt_count.fetch_sub(1, Ordering::SeqCst); 818 } 819 820 #[inline(always)] 821 pub unsafe fn set_preempt_count(&self, count: usize) { 822 self.preempt_count.store(count, Ordering::SeqCst); 823 } 824 825 #[inline(always)] 826 pub fn flags(&self) -> &mut ProcessFlags { 827 return self.flags.get_mut(); 828 } 829 830 /// 请注意，这个值能在中断上下文中读取，但不能被中断上下文修改 831 /// 否则会导致死锁 832 #[inline(always)] 833 pub fn basic(&self) -> RwLockReadGuard<ProcessBasicInfo> { 834 return self.basic.read_irqsave(); 835 } 836 837 #[inline(always)] 838 pub fn set_name(&self, name: String) { 839 self.basic.write().set_name(name); 840 } 841 842 #[inline(always)] 843 pub fn basic_mut(&self) -> RwLockWriteGuard<ProcessBasicInfo> { 844 return self.basic.write_irqsave(); 845 } 846 847 /// # 获取arch info的锁，同时关闭中断 848 #[inline(always)] 849 pub fn arch_info_irqsave(&self) -> SpinLockGuard<ArchPCBInfo> { 850 return self.arch_info.lock_irqsave(); 851 } 852 853 /// # 获取arch info的锁，但是不关闭中断 854 /// 855 /// 由于arch info在进程切换的时候会使用到， 856 /// 因此在中断上下文外，获取arch info 而不irqsave是不安全的. 857 /// 858 /// 只能在以下情况下使用这个函数： 859 /// - 在中断上下文中（中断已经禁用），获取arch info的锁。 860 /// - 刚刚创建新的pcb 861 #[inline(always)] 862 pub unsafe fn arch_info(&self) -> SpinLockGuard<ArchPCBInfo> { 863 return self.arch_info.lock(); 864 } 865 866 #[inline(always)] 867 pub fn kernel_stack(&self) -> RwLockReadGuard<KernelStack> { 868 return self.kernel_stack.read(); 869 } 870 871 pub unsafe fn kernel_stack_force_ref(&self) -> &KernelStack { 872 self.kernel_stack.force_get_ref() 873 } 874 875 #[inline(always)] 876 #[allow(dead_code)] 877 pub fn kernel_stack_mut(&self) -> RwLockWriteGuard<KernelStack> { 878 return self.kernel_stack.write(); 879 } 880 881 #[inline(always)] 882 pub fn sched_info(&self) -> &ProcessSchedulerInfo { 883 return &self.sched_info; 884 } 885 886 #[inline(always)] 887 pub fn worker_private(&self) -> SpinLockGuard<Option<WorkerPrivate>> { 888 return self.worker_private.lock(); 889 } 890 891 #[inline(always)] 892 pub fn pid(&self) -> Pid { 893 return self.pid; 894 } 895 896 #[inline(always)] 897 pub fn pid_strcut(&self) -> Arc<RwLock<PidStrcut>> { 898 self.thread_pid.clone() 899 } 900 901 #[inline(always)] 902 pub fn tgid(&self) -> Pid { 903 return self.tgid; 904 } 905 906 #[inline(always)] 907 pub fn fs_struct(&self) -> Arc<SpinLock<FsStruct>> { 908 self.fs.clone() 909 } 910 911 /// 获取文件描述符表的Arc指针 912 #[inline(always)] 913 pub fn fd_table(&self) -> Arc<RwLock<FileDescriptorVec>> { 914 return self.basic.read().fd_table().unwrap(); 915 } 916 917 #[inline(always)] 918 pub fn cred(&self) -> Cred { 919 self.cred.lock().clone() 920 } 921 922 /// 根据文件描述符序号，获取socket对象的Arc指针 923 /// 924 /// ## 参数 925 /// 926 /// - `fd` 文件描述符序号 927 /// 928 /// ## 返回值 929 /// 930 /// 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 931 pub fn get_socket(&self, fd: i32) -> Option<Arc<SocketInode>> { 932 let binding = ProcessManager::current_pcb().fd_table(); 933 let fd_table_guard = binding.read(); 934 935 let f = fd_table_guard.get_file_by_fd(fd)?; 936 drop(fd_table_guard); 937 938 if f.file_type() != FileType::Socket { 939 return None; 940 } 941 let socket: Arc<SocketInode> = f 942 .inode() 943 .downcast_arc::<SocketInode>() 944 .expect("Not a socket inode"); 945 return Some(socket); 946 } 947 948 /// 当前进程退出时,让初始进程收养所有子进程 949 unsafe fn adopt_childen(&self) -> Result<(), SystemError> { 950 match ProcessManager::find(Pid(1)) { 951 Some(init_pcb) => { 952 let childen_guard = self.children.write(); 953 let mut init_childen_guard = init_pcb.children.write(); 954 955 childen_guard.iter().for_each(|pid| { 956 init_childen_guard.push(*pid); 957 }); 958 959 return Ok(()); 960 } 961 _ => Err(SystemError::ECHILD), 962 } 963 } 964 965 /// 生成进程的名字 966 pub fn generate_name(program_path: &str, args: &Vec<CString>) -> String { 967 let mut name = program_path.to_string(); 968 for arg in args { 969 name.push(' '); 970 name.push_str(arg.to_string_lossy().as_ref()); 971 } 972 return name; 973 } 974 975 pub fn sig_info_irqsave(&self) -> RwLockReadGuard<ProcessSignalInfo> { 976 self.sig_info.read_irqsave() 977 } 978 979 pub fn try_siginfo_irqsave(&self, times: u8) -> Option<RwLockReadGuard<ProcessSignalInfo>> { 980 for _ in 0..times { 981 if let Some(r) = self.sig_info.try_read_irqsave() { 982 return Some(r); 983 } 984 } 985 986 return None; 987 } 988 989 pub fn sig_info_mut(&self) -> RwLockWriteGuard<ProcessSignalInfo> { 990 self.sig_info.write_irqsave() 991 } 992 993 pub fn try_siginfo_mut(&self, times: u8) -> Option<RwLockWriteGuard<ProcessSignalInfo>> { 994 for _ in 0..times { 995 if let Some(r) = self.sig_info.try_write_irqsave() { 996 return Some(r); 997 } 998 } 999 1000 return None; 1001 } 1002 1003 /// 判断当前进程是否有未处理的信号 1004 pub fn has_pending_signal(&self) -> bool { 1005 let sig_info = self.sig_info_irqsave(); 1006 let has_pending = sig_info.sig_pending().has_pending(); 1007 drop(sig_info); 1008 return has_pending; 1009 } 1010 1011 pub fn sig_struct(&self) -> SpinLockGuard<SignalStruct> { 1012 self.sig_struct.lock_irqsave() 1013 } 1014 1015 pub fn try_sig_struct_irqsave(&self, times: u8) -> Option<SpinLockGuard<SignalStruct>> { 1016 for _ in 0..times { 1017 if let Ok(r) = self.sig_struct.try_lock_irqsave() { 1018 return Some(r); 1019 } 1020 } 1021 1022 return None; 1023 } 1024 1025 pub fn sig_struct_irqsave(&self) -> SpinLockGuard<SignalStruct> { 1026 self.sig_struct.lock_irqsave() 1027 } 1028 1029 #[inline(always)] 1030 pub fn get_robust_list(&self) -> RwLockReadGuard<Option<RobustListHead>> { 1031 return self.robust_list.read_irqsave(); 1032 } 1033 1034 #[inline(always)] 1035 pub fn set_robust_list(&self, new_robust_list: Option<RobustListHead>) { 1036 *self.robust_list.write_irqsave() = new_robust_list; 1037 } 1038 1039 pub fn alarm_timer_irqsave(&self) -> SpinLockGuard<Option<AlarmTimer>> { 1040 return self.alarm_timer.lock_irqsave(); 1041 } 1042 1043 pub fn get_nsproxy(&self) -> Arc<RwLock<NsProxy>> { 1044 self.nsproxy.clone() 1045 } 1046 1047 pub fn set_nsproxy(&self, nsprsy: NsProxy) { 1048 *self.nsproxy.write() = nsprsy; 1049 } 1050 } 1051 1052 impl Drop for ProcessControlBlock { 1053 fn drop(&mut self) { 1054 let irq_guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 1055 // 在ProcFS中,解除进程的注册 1056 procfs_unregister_pid(self.pid()) 1057 .unwrap_or_else(|e| panic!("procfs_unregister_pid failed: error: {e:?}")); 1058 1059 if let Some(ppcb) = self.parent_pcb.read_irqsave().upgrade() { 1060 ppcb.children 1061 .write_irqsave() 1062 .retain(|pid| *pid != self.pid()); 1063 } 1064 1065 drop(irq_guard); 1066 } 1067 } 1068 1069 /// 线程信息 1070 #[derive(Debug)] 1071 pub struct ThreadInfo { 1072 // 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 1073 clear_child_tid: Option<VirtAddr>, 1074 set_child_tid: Option<VirtAddr>, 1075 1076 vfork_done: Option<Arc<Completion>>, 1077 /// 线程组的组长 1078 group_leader: Weak<ProcessControlBlock>, 1079 } 1080 1081 impl ThreadInfo { 1082 pub fn new() -> Self { 1083 Self { 1084 clear_child_tid: None, 1085 set_child_tid: None, 1086 vfork_done: None, 1087 group_leader: Weak::default(), 1088 } 1089 } 1090 1091 pub fn group_leader(&self) -> Option<Arc<ProcessControlBlock>> { 1092 return self.group_leader.upgrade(); 1093 } 1094 } 1095 1096 /// 进程的基本信息 1097 /// 1098 /// 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。 1099 #[derive(Debug)] 1100 pub struct ProcessBasicInfo { 1101 /// 当前进程的进程组id 1102 pgid: Pid, 1103 /// 当前进程的父进程的pid 1104 ppid: Pid, 1105 /// 当前进程所属会话id 1106 sid: Pid, 1107 /// 进程的名字 1108 name: String, 1109 1110 /// 当前进程的工作目录 1111 cwd: String, 1112 1113 /// 用户地址空间 1114 user_vm: Option<Arc<AddressSpace>>, 1115 1116 /// 文件描述符表 1117 fd_table: Option<Arc<RwLock<FileDescriptorVec>>>, 1118 } 1119 1120 impl ProcessBasicInfo { 1121 #[inline(never)] 1122 pub fn new( 1123 pgid: Pid, 1124 ppid: Pid, 1125 sid: Pid, 1126 name: String, 1127 cwd: String, 1128 user_vm: Option<Arc<AddressSpace>>, 1129 ) -> RwLock<Self> { 1130 let fd_table = Arc::new(RwLock::new(FileDescriptorVec::new())); 1131 return RwLock::new(Self { 1132 pgid, 1133 ppid, 1134 sid, 1135 name, 1136 cwd, 1137 user_vm, 1138 fd_table: Some(fd_table), 1139 }); 1140 } 1141 1142 pub fn pgid(&self) -> Pid { 1143 return self.pgid; 1144 } 1145 1146 pub fn ppid(&self) -> Pid { 1147 return self.ppid; 1148 } 1149 1150 pub fn sid(&self) -> Pid { 1151 return self.sid; 1152 } 1153 1154 pub fn name(&self) -> &str { 1155 return &self.name; 1156 } 1157 1158 pub fn set_name(&mut self, name: String) { 1159 self.name = name; 1160 } 1161 1162 pub fn cwd(&self) -> String { 1163 return self.cwd.clone(); 1164 } 1165 pub fn set_cwd(&mut self, path: String) { 1166 return self.cwd = path; 1167 } 1168 1169 pub fn user_vm(&self) -> Option<Arc<AddressSpace>> { 1170 return self.user_vm.clone(); 1171 } 1172 1173 pub unsafe fn set_user_vm(&mut self, user_vm: Option<Arc<AddressSpace>>) { 1174 self.user_vm = user_vm; 1175 } 1176 1177 pub fn fd_table(&self) -> Option<Arc<RwLock<FileDescriptorVec>>> { 1178 return self.fd_table.clone(); 1179 } 1180 1181 pub fn set_fd_table(&mut self, fd_table: Option<Arc<RwLock<FileDescriptorVec>>>) { 1182 self.fd_table = fd_table; 1183 } 1184 } 1185 1186 #[derive(Debug)] 1187 pub struct ProcessSchedulerInfo { 1188 /// 当前进程所在的cpu 1189 on_cpu: AtomicProcessorId, 1190 /// 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）， 1191 /// 该字段存储要被迁移到的目标处理器核心号 1192 // migrate_to: AtomicProcessorId, 1193 inner_locked: RwLock<InnerSchedInfo>, 1194 /// 进程的调度优先级 1195 // priority: SchedPriority, 1196 /// 当前进程的虚拟运行时间 1197 // virtual_runtime: AtomicIsize, 1198 /// 由实时调度器管理的时间片 1199 // rt_time_slice: AtomicIsize, 1200 pub sched_stat: RwLock<SchedInfo>, 1201 /// 调度策略 1202 pub sched_policy: RwLock<crate::sched::SchedPolicy>, 1203 /// cfs调度实体 1204 pub sched_entity: Arc<FairSchedEntity>, 1205 pub on_rq: SpinLock<OnRq>, 1206 1207 pub prio_data: RwLock<PrioData>, 1208 } 1209 1210 #[derive(Debug, Default)] 1211 #[allow(dead_code)] 1212 pub struct SchedInfo { 1213 /// 记录任务在特定 CPU 上运行的次数 1214 pub pcount: usize, 1215 /// 记录任务等待在运行队列上的时间 1216 pub run_delay: usize, 1217 /// 记录任务上次在 CPU 上运行的时间戳 1218 pub last_arrival: u64, 1219 /// 记录任务上次被加入到运行队列中的时间戳 1220 pub last_queued: u64, 1221 } 1222 1223 #[derive(Debug)] 1224 #[allow(dead_code)] 1225 pub struct PrioData { 1226 pub prio: i32, 1227 pub static_prio: i32, 1228 pub normal_prio: i32, 1229 } 1230 1231 impl Default for PrioData { 1232 fn default() -> Self { 1233 Self { 1234 prio: MAX_PRIO - 20, 1235 static_prio: MAX_PRIO - 20, 1236 normal_prio: MAX_PRIO - 20, 1237 } 1238 } 1239 } 1240 1241 #[derive(Debug)] 1242 pub struct InnerSchedInfo { 1243 /// 当前进程的状态 1244 state: ProcessState, 1245 /// 进程的调度策略 1246 sleep: bool, 1247 } 1248 1249 impl InnerSchedInfo { 1250 pub fn state(&self) -> ProcessState { 1251 return self.state; 1252 } 1253 1254 pub fn set_state(&mut self, state: ProcessState) { 1255 self.state = state; 1256 } 1257 1258 pub fn set_sleep(&mut self) { 1259 self.sleep = true; 1260 } 1261 1262 pub fn set_wakeup(&mut self) { 1263 self.sleep = false; 1264 } 1265 1266 pub fn is_mark_sleep(&self) -> bool { 1267 self.sleep 1268 } 1269 } 1270 1271 impl ProcessSchedulerInfo { 1272 #[inline(never)] 1273 pub fn new(on_cpu: Option<ProcessorId>) -> Self { 1274 let cpu_id = on_cpu.unwrap_or(ProcessorId::INVALID); 1275 return Self { 1276 on_cpu: AtomicProcessorId::new(cpu_id), 1277 // migrate_to: AtomicProcessorId::new(ProcessorId::INVALID), 1278 inner_locked: RwLock::new(InnerSchedInfo { 1279 state: ProcessState::Blocked(false), 1280 sleep: false, 1281 }), 1282 // virtual_runtime: AtomicIsize::new(0), 1283 // rt_time_slice: AtomicIsize::new(0), 1284 // priority: SchedPriority::new(100).unwrap(), 1285 sched_stat: RwLock::new(SchedInfo::default()), 1286 sched_policy: RwLock::new(crate::sched::SchedPolicy::CFS), 1287 sched_entity: FairSchedEntity::new(), 1288 on_rq: SpinLock::new(OnRq::None), 1289 prio_data: RwLock::new(PrioData::default()), 1290 }; 1291 } 1292 1293 pub fn sched_entity(&self) -> Arc<FairSchedEntity> { 1294 return self.sched_entity.clone(); 1295 } 1296 1297 pub fn on_cpu(&self) -> Option<ProcessorId> { 1298 let on_cpu = self.on_cpu.load(Ordering::SeqCst); 1299 if on_cpu == ProcessorId::INVALID { 1300 return None; 1301 } else { 1302 return Some(on_cpu); 1303 } 1304 } 1305 1306 pub fn set_on_cpu(&self, on_cpu: Option<ProcessorId>) { 1307 if let Some(cpu_id) = on_cpu { 1308 self.on_cpu.store(cpu_id, Ordering::SeqCst); 1309 } else { 1310 self.on_cpu.store(ProcessorId::INVALID, Ordering::SeqCst); 1311 } 1312 } 1313 1314 // pub fn migrate_to(&self) -> Option<ProcessorId> { 1315 // let migrate_to = self.migrate_to.load(Ordering::SeqCst); 1316 // if migrate_to == ProcessorId::INVALID { 1317 // return None; 1318 // } else { 1319 // return Some(migrate_to); 1320 // } 1321 // } 1322 1323 // pub fn set_migrate_to(&self, migrate_to: Option<ProcessorId>) { 1324 // if let Some(data) = migrate_to { 1325 // self.migrate_to.store(data, Ordering::SeqCst); 1326 // } else { 1327 // self.migrate_to 1328 // .store(ProcessorId::INVALID, Ordering::SeqCst) 1329 // } 1330 // } 1331 1332 pub fn inner_lock_write_irqsave(&self) -> RwLockWriteGuard<InnerSchedInfo> { 1333 return self.inner_locked.write_irqsave(); 1334 } 1335 1336 pub fn inner_lock_read_irqsave(&self) -> RwLockReadGuard<InnerSchedInfo> { 1337 return self.inner_locked.read_irqsave(); 1338 } 1339 1340 // pub fn inner_lock_try_read_irqsave( 1341 // &self, 1342 // times: u8, 1343 // ) -> Option<RwLockReadGuard<InnerSchedInfo>> { 1344 // for _ in 0..times { 1345 // if let Some(r) = self.inner_locked.try_read_irqsave() { 1346 // return Some(r); 1347 // } 1348 // } 1349 1350 // return None; 1351 // } 1352 1353 // pub fn inner_lock_try_upgradable_read_irqsave( 1354 // &self, 1355 // times: u8, 1356 // ) -> Option<RwLockUpgradableGuard<InnerSchedInfo>> { 1357 // for _ in 0..times { 1358 // if let Some(r) = self.inner_locked.try_upgradeable_read_irqsave() { 1359 // return Some(r); 1360 // } 1361 // } 1362 1363 // return None; 1364 // } 1365 1366 // pub fn virtual_runtime(&self) -> isize { 1367 // return self.virtual_runtime.load(Ordering::SeqCst); 1368 // } 1369 1370 // pub fn set_virtual_runtime(&self, virtual_runtime: isize) { 1371 // self.virtual_runtime 1372 // .store(virtual_runtime, Ordering::SeqCst); 1373 // } 1374 // pub fn increase_virtual_runtime(&self, delta: isize) { 1375 // self.virtual_runtime.fetch_add(delta, Ordering::SeqCst); 1376 // } 1377 1378 // pub fn rt_time_slice(&self) -> isize { 1379 // return self.rt_time_slice.load(Ordering::SeqCst); 1380 // } 1381 1382 // pub fn set_rt_time_slice(&self, rt_time_slice: isize) { 1383 // self.rt_time_slice.store(rt_time_slice, Ordering::SeqCst); 1384 // } 1385 1386 // pub fn increase_rt_time_slice(&self, delta: isize) { 1387 // self.rt_time_slice.fetch_add(delta, Ordering::SeqCst); 1388 // } 1389 1390 pub fn policy(&self) -> crate::sched::SchedPolicy { 1391 return *self.sched_policy.read_irqsave(); 1392 } 1393 } 1394 1395 #[derive(Debug, Clone)] 1396 pub struct KernelStack { 1397 stack: Option<AlignedBox<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>>, 1398 /// 标记该内核栈是否可以被释放 1399 can_be_freed: bool, 1400 } 1401 1402 impl KernelStack { 1403 pub const SIZE: usize = 0x4000; 1404 pub const ALIGN: usize = 0x4000; 1405 1406 pub fn new() -> Result<Self, SystemError> { 1407 return Ok(Self { 1408 stack: Some( 1409 AlignedBox::<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>::new_zeroed()?, 1410 ), 1411 can_be_freed: true, 1412 }); 1413 } 1414 1415 /// 根据已有的空间，构造一个内核栈结构体 1416 /// 1417 /// 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！ 1418 pub unsafe fn from_existed(base: VirtAddr) -> Result<Self, SystemError> { 1419 if base.is_null() || !base.check_aligned(Self::ALIGN) { 1420 return Err(SystemError::EFAULT); 1421 } 1422 1423 return Ok(Self { 1424 stack: Some( 1425 AlignedBox::<[u8; KernelStack::SIZE], { KernelStack::ALIGN }>::new_unchecked( 1426 base.data() as *mut [u8; KernelStack::SIZE], 1427 ), 1428 ), 1429 can_be_freed: false, 1430 }); 1431 } 1432 1433 /// 返回内核栈的起始虚拟地址(低地址) 1434 pub fn start_address(&self) -> VirtAddr { 1435 return VirtAddr::new(self.stack.as_ref().unwrap().as_ptr() as usize); 1436 } 1437 1438 /// 返回内核栈的结束虚拟地址(高地址)(不包含该地址) 1439 pub fn stack_max_address(&self) -> VirtAddr { 1440 return VirtAddr::new(self.stack.as_ref().unwrap().as_ptr() as usize + Self::SIZE); 1441 } 1442 1443 pub unsafe fn set_pcb(&mut self, pcb: Weak<ProcessControlBlock>) -> Result<(), SystemError> { 1444 // 将一个Weak<ProcessControlBlock>放到内核栈的最低地址处 1445 let p: *const ProcessControlBlock = Weak::into_raw(pcb); 1446 let stack_bottom_ptr = self.start_address().data() as *mut *const ProcessControlBlock; 1447 1448 // 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 1449 if unlikely(unsafe { !(*stack_bottom_ptr).is_null() }) { 1450 error!("kernel stack bottom is not null: {:p}", *stack_bottom_ptr); 1451 return Err(SystemError::EPERM); 1452 } 1453 // 将pcb的地址放到内核栈的最低地址处 1454 unsafe { 1455 *stack_bottom_ptr = p; 1456 } 1457 1458 return Ok(()); 1459 } 1460 1461 /// 清除内核栈的pcb指针 1462 /// 1463 /// ## 参数 1464 /// 1465 /// - `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 1466 pub unsafe fn clear_pcb(&mut self, force: bool) { 1467 let stack_bottom_ptr = self.start_address().data() as *mut *const ProcessControlBlock; 1468 if unlikely(unsafe { (*stack_bottom_ptr).is_null() }) { 1469 return; 1470 } 1471 1472 if !force { 1473 let pcb_ptr: Weak<ProcessControlBlock> = Weak::from_raw(*stack_bottom_ptr); 1474 drop(pcb_ptr); 1475 } 1476 1477 *stack_bottom_ptr = core::ptr::null(); 1478 } 1479 1480 /// 返回指向当前内核栈pcb的Arc指针 1481 #[allow(dead_code)] 1482 pub unsafe fn pcb(&self) -> Option<Arc<ProcessControlBlock>> { 1483 // 从内核栈的最低地址处取出pcb的地址 1484 let p = self.stack.as_ref().unwrap().as_ptr() as *const *const ProcessControlBlock; 1485 if unlikely(unsafe { (*p).is_null() }) { 1486 return None; 1487 } 1488 1489 // 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 1490 let weak_wrapper: ManuallyDrop<Weak<ProcessControlBlock>> = 1491 ManuallyDrop::new(Weak::from_raw(*p)); 1492 1493 let new_arc: Arc<ProcessControlBlock> = weak_wrapper.upgrade()?; 1494 return Some(new_arc); 1495 } 1496 } 1497 1498 impl Drop for KernelStack { 1499 fn drop(&mut self) { 1500 if self.stack.is_some() { 1501 let ptr = self.stack.as_ref().unwrap().as_ptr() as *const *const ProcessControlBlock; 1502 if unsafe { !(*ptr).is_null() } { 1503 let pcb_ptr: Weak<ProcessControlBlock> = unsafe { Weak::from_raw(*ptr) }; 1504 drop(pcb_ptr); 1505 } 1506 } 1507 // 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 1508 if !self.can_be_freed { 1509 let bx = self.stack.take(); 1510 core::mem::forget(bx); 1511 } 1512 } 1513 } 1514 1515 pub fn process_init() { 1516 ProcessManager::init(); 1517 } 1518 1519 #[derive(Debug)] 1520 pub struct ProcessSignalInfo { 1521 // 当前进程 1522 sig_block: SigSet, 1523 // sig_pending 中存储当前线程要处理的信号 1524 sig_pending: SigPending, 1525 // sig_shared_pending 中存储当前线程所属进程要处理的信号 1526 sig_shared_pending: SigPending, 1527 // 当前进程对应的tty 1528 tty: Option<Arc<TtyCore>>, 1529 } 1530 1531 impl ProcessSignalInfo { 1532 pub fn sig_block(&self) -> &SigSet { 1533 &self.sig_block 1534 } 1535 1536 pub fn sig_pending(&self) -> &SigPending { 1537 &self.sig_pending 1538 } 1539 1540 pub fn sig_pending_mut(&mut self) -> &mut SigPending { 1541 &mut self.sig_pending 1542 } 1543 1544 pub fn sig_block_mut(&mut self) -> &mut SigSet { 1545 &mut self.sig_block 1546 } 1547 1548 pub fn sig_shared_pending_mut(&mut self) -> &mut SigPending { 1549 &mut self.sig_shared_pending 1550 } 1551 1552 pub fn sig_shared_pending(&self) -> &SigPending { 1553 &self.sig_shared_pending 1554 } 1555 1556 pub fn tty(&self) -> Option<Arc<TtyCore>> { 1557 self.tty.clone() 1558 } 1559 1560 pub fn set_tty(&mut self, tty: Option<Arc<TtyCore>>) { 1561 self.tty = tty; 1562 } 1563 1564 /// 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 1565 /// 1566 /// ## 参数 1567 /// 1568 /// - `sig_mask` 被忽略掉的信号 1569 /// 1570 pub fn dequeue_signal(&mut self, sig_mask: &SigSet) -> (Signal, Option<SigInfo>) { 1571 let res = self.sig_pending.dequeue_signal(sig_mask); 1572 if res.0 != Signal::INVALID { 1573 return res; 1574 } else { 1575 return self.sig_shared_pending.dequeue_signal(sig_mask); 1576 } 1577 } 1578 } 1579 1580 impl Default for ProcessSignalInfo { 1581 fn default() -> Self { 1582 Self { 1583 sig_block: SigSet::empty(), 1584 sig_pending: SigPending::default(), 1585 sig_shared_pending: SigPending::default(), 1586 tty: None, 1587 } 1588 } 1589 } 1590