1 use crate::{ 2 arch::{asm::current::current_pcb, context::switch_process, CurrentIrqArch}, 3 exception::InterruptArch, 4 syscall::{Syscall, SystemError}, 5 }; 6 7 use super::core::do_sched; 8 9 impl Syscall { 10 /// @brief 让系统立即运行调度器的系统调用 11 /// 请注意，该系统调用不能由ring3的程序发起 12 #[inline(always)] 13 pub fn sched(from_user: bool) -> Result<usize, SystemError> { 14 let irq_guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 15 16 // 进行权限校验，拒绝用户态发起调度 17 if from_user { 18 return Err(SystemError::EPERM); 19 } 20 // 根据调度结果统一进行切换 21 let pcb = do_sched(); 22 23 if pcb.is_some() { 24 switch_process(current_pcb(), pcb.unwrap()); 25 } 26 drop(irq_guard); 27 return Ok(0); 28 } 29 } 30