1 use core::hint::spin_loop; 2 3 use alloc::{boxed::Box, sync::Arc}; 4 5 use crate::{ 6 arch::{sched::sched, CurrentIrqArch, CurrentTimeArch}, 7 exception::InterruptArch, 8 include::bindings::bindings::{useconds_t, Cpu_tsc_freq}, 9 process::ProcessManager, 10 syscall::SystemError, 11 }; 12 13 use super::{ 14 timer::{next_n_us_timer_jiffies, Timer, WakeUpHelper}, 15 TimeArch, TimeSpec, 16 }; 17 18 /// @brief 休眠指定时间（单位：纳秒） 19 /// 20 /// @param sleep_time 指定休眠的时间 21 /// 22 /// @return Ok(TimeSpec) 剩余休眠时间 23 /// 24 /// @return Err(SystemError) 错误码 25 pub fn nanosleep(sleep_time: TimeSpec) -> Result<TimeSpec, SystemError> { 26 if sleep_time.tv_nsec < 0 || sleep_time.tv_nsec >= 1000000000 { 27 return Err(SystemError::EINVAL); 28 } 29 // 对于小于500us的时间，使用spin/rdtsc来进行定时 30 31 if sleep_time.tv_nsec < 500000 { 32 let expired_tsc: u64 = unsafe { 33 CurrentTimeArch::get_cycles() as u64 34 + (sleep_time.tv_nsec as u64 * Cpu_tsc_freq) / 1000000000 35 }; 36 while (CurrentTimeArch::get_cycles() as u64) < expired_tsc { 37 spin_loop() 38 } 39 return Ok(TimeSpec { 40 tv_sec: 0, 41 tv_nsec: 0, 42 }); 43 } 44 // 创建定时器 45 let handler: Box<WakeUpHelper> = WakeUpHelper::new(ProcessManager::current_pcb()); 46 let timer: Arc<Timer> = Timer::new( 47 handler, 48 next_n_us_timer_jiffies((sleep_time.tv_nsec / 1000) as u64), 49 ); 50 51 let irq_guard: crate::exception::IrqFlagsGuard = 52 unsafe { CurrentIrqArch::save_and_disable_irq() }; 53 ProcessManager::mark_sleep(true).ok(); 54 timer.activate(); 55 56 drop(irq_guard); 57 58 sched(); 59 60 // TODO: 增加信号唤醒的功能后，返回正确的剩余时间 61 62 return Ok(TimeSpec { 63 tv_sec: 0, 64 tv_nsec: 0, 65 }); 66 } 67 68 /// @brief 休眠指定时间（单位：微秒） 69 /// 70 /// @param usec 微秒 71 /// 72 /// @return Ok(TimeSpec) 剩余休眠时间 73 /// 74 /// @return Err(SystemError) 错误码 75 pub fn usleep(sleep_time: TimeSpec) -> Result<TimeSpec, SystemError> { 76 match nanosleep(sleep_time) { 77 Ok(value) => return Ok(value), 78 Err(err) => return Err(err), 79 }; 80 } 81 82 //===== 以下为提供给C的接口 ===== 83 84 /// @brief 休眠指定时间（单位：微秒）（提供给C的接口） 85 /// 86 /// @param usec 微秒 87 /// 88 /// @return Ok(i32) 0 89 /// 90 /// @return Err(SystemError) 错误码 91 #[no_mangle] 92 pub extern "C" fn rs_usleep(usec: useconds_t) -> i32 { 93 let sleep_time = TimeSpec { 94 tv_sec: (usec / 1000000) as i64, 95 tv_nsec: ((usec % 1000000) * 1000) as i64, 96 }; 97 match usleep(sleep_time) { 98 Ok(_) => { 99 return 0; 100 } 101 Err(err) => { 102 return err.to_posix_errno(); 103 } 104 }; 105 } 106