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Linux/rust/kernel/time.rs

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Diff markup

Differences between /rust/kernel/time.rs (Version linux-6.12-rc7) and /rust/kernel/time.rs (Version linux-5.5.19)


  1 // SPDX-License-Identifier: GPL-2.0               
  2                                                   
  3 //! Time related primitives.                      
  4 //!                                               
  5 //! This module contains the kernel APIs relat    
  6 //! have been ported or wrapped for usage by R    
  7 //!                                               
  8 //! C header: [`include/linux/jiffies.h`](srct    
  9 //! C header: [`include/linux/ktime.h`](srctre    
 10                                                   
 11 /// The number of nanoseconds per millisecond.    
 12 pub const NSEC_PER_MSEC: i64 = bindings::NSEC_    
 13                                                   
 14 /// The time unit of Linux kernel. One jiffy e    
 15 pub type Jiffies = core::ffi::c_ulong;            
 16                                                   
 17 /// The millisecond time unit.                    
 18 pub type Msecs = core::ffi::c_uint;               
 19                                                   
 20 /// Converts milliseconds to jiffies.             
 21 #[inline]                                         
 22 pub fn msecs_to_jiffies(msecs: Msecs) -> Jiffi    
 23     // SAFETY: The `__msecs_to_jiffies` functi    
 24     // matter what the argument is.               
 25     unsafe { bindings::__msecs_to_jiffies(msec    
 26 }                                                 
 27                                                   
 28 /// A Rust wrapper around a `ktime_t`.            
 29 #[repr(transparent)]                              
 30 #[derive(Copy, Clone)]                            
 31 pub struct Ktime {                                
 32     inner: bindings::ktime_t,                     
 33 }                                                 
 34                                                   
 35 impl Ktime {                                      
 36     /// Create a `Ktime` from a raw `ktime_t`.    
 37     #[inline]                                     
 38     pub fn from_raw(inner: bindings::ktime_t)     
 39         Self { inner }                            
 40     }                                             
 41                                                   
 42     /// Get the current time using `CLOCK_MONO    
 43     #[inline]                                     
 44     pub fn ktime_get() -> Self {                  
 45         // SAFETY: It is always safe to call `    
 46         Self::from_raw(unsafe { bindings::ktim    
 47     }                                             
 48                                                   
 49     /// Divide the number of nanoseconds by a     
 50     #[inline]                                     
 51     fn divns_constant<const DIV: i64>(self) ->    
 52         self.to_ns() / DIV                        
 53     }                                             
 54                                                   
 55     /// Returns the number of nanoseconds.        
 56     #[inline]                                     
 57     pub fn to_ns(self) -> i64 {                   
 58         self.inner                                
 59     }                                             
 60                                                   
 61     /// Returns the number of milliseconds.       
 62     #[inline]                                     
 63     pub fn to_ms(self) -> i64 {                   
 64         self.divns_constant::<NSEC_PER_MSEC>()    
 65     }                                             
 66 }                                                 
 67                                                   
 68 /// Returns the number of milliseconds between    
 69 #[inline]                                         
 70 pub fn ktime_ms_delta(later: Ktime, earlier: K    
 71     (later - earlier).to_ms()                     
 72 }                                                 
 73                                                   
 74 impl core::ops::Sub for Ktime {                   
 75     type Output = Ktime;                          
 76                                                   
 77     #[inline]                                     
 78     fn sub(self, other: Ktime) -> Ktime {         
 79         Self {                                    
 80             inner: self.inner - other.inner,      
 81         }                                         
 82     }                                             
 83 }                                                 
                                                      

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