time.rs.html -- source
Description: Source to the Rust file `libstd/sys/unix/time.rs`.
Keywords: rust, rustlang, rust-lang

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254
    255
    256
    257
    258
    259
    260
    261
    262
    263
    264
    265
    266
    267
    268
    269
    270
    271
    272
    273
    274
    275
    276
    277
    278
    279
    280
    281
    282
    283
    284
    285
    286
    287
    288
    289
    290
    291
    292
    293
    294
    295
    296
    297
    298
    299
    300
    301
    302
    303
    304
    305
    306
    307
    308
    309
    310
    311
    312
    313
    314
    315
    316
    317
    318
    319
    320
    321
    322
    323
    324
    325
    326
    327
    328
    329
    330
    331
    332
    333
    334
    335
    336
    337
    338
    339
    340
    341
    342
    343
    344
    345
    346
    347
    348
    349
    350
    351
    352
    353
    354
    355
    356
    357
    358
    359
    360
    361
    362
    363
    364
    365

    // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use cmp::Ordering;
    use libc;
    use time::Duration;
    use core::hash::{Hash, Hasher};

    pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
    use convert::TryInto;

    const NSEC_PER_SEC: u64 = 1_000_000_000;

    #[derive(Copy, Clone)]
    struct Timespec {
        t: libc::timespec,
    }

    impl Timespec {
        fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
            if self >= other {
                Ok(if self.t.tv_nsec >= other.t.tv_nsec {
                    Duration::new((self.t.tv_sec - other.t.tv_sec) as u64,
                                  (self.t.tv_nsec - other.t.tv_nsec) as u32)
                } else {
                    Duration::new((self.t.tv_sec - 1 - other.t.tv_sec) as u64,
                                  self.t.tv_nsec as u32 + (NSEC_PER_SEC as u32) -
                                  other.t.tv_nsec as u32)
                })
            } else {
                match other.sub_timespec(self) {
                    Ok(d) => Err(d),
                    Err(d) => Ok(d),
                }
            }
        }

        fn add_duration(&self, other: &Duration) -> Timespec {
            let mut secs = other
                .as_secs()
                .try_into() // <- target type would be `libc::time_t`
                .ok()
                .and_then(|secs| self.t.tv_sec.checked_add(secs))
                .expect("overflow when adding duration to time");

            // Nano calculations can't overflow because nanos are <1B which fit
            // in a u32.
            let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
            if nsec >= NSEC_PER_SEC as u32 {
                nsec -= NSEC_PER_SEC as u32;
                secs = secs.checked_add(1).expect("overflow when adding \
                                                   duration to time");
            }
            Timespec {
                t: libc::timespec {
                    tv_sec: secs,
                    tv_nsec: nsec as _,
                },
            }
        }

        fn sub_duration(&self, other: &Duration) -> Timespec {
            let mut secs = other
                .as_secs()
                .try_into() // <- target type would be `libc::time_t`
                .ok()
                .and_then(|secs| self.t.tv_sec.checked_sub(secs))
                .expect("overflow when subtracting duration from time");

            // Similar to above, nanos can't overflow.
            let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;
            if nsec < 0 {
                nsec += NSEC_PER_SEC as i32;
                secs = secs.checked_sub(1).expect("overflow when subtracting \
                                                   duration from time");
            }
            Timespec {
                t: libc::timespec {
                    tv_sec: secs,
                    tv_nsec: nsec as _,
                },
            }
        }
    }

    impl PartialEq for Timespec {
        fn eq(&self, other: &Timespec) -> bool {
            self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
        }
    }

    impl Eq for Timespec {}

    impl PartialOrd for Timespec {
        fn partial_cmp(&self, other: &Timespec) -> Option<Ordering> {
            Some(self.cmp(other))
        }
    }

    impl Ord for Timespec {
        fn cmp(&self, other: &Timespec) -> Ordering {
            let me = (self.t.tv_sec, self.t.tv_nsec);
            let other = (other.t.tv_sec, other.t.tv_nsec);
            me.cmp(&other)
        }
    }

    impl Hash for Timespec {
        fn hash<H : Hasher>(&self, state: &mut H) {
            self.t.tv_sec.hash(state);
            self.t.tv_nsec.hash(state);
        }
    }

    #[cfg(any(target_os = "macos", target_os = "ios"))]
    mod inner {
        use fmt;
        use libc;
        use sync::Once;
        use sys::cvt;
        use sys_common::mul_div_u64;
        use time::Duration;

        use super::NSEC_PER_SEC;
        use super::Timespec;

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
        pub struct Instant {
            t: u64
        }

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct SystemTime {
            t: Timespec,
        }

        pub const UNIX_EPOCH: SystemTime = SystemTime {
            t: Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                },
            },
        };

        impl Instant {
            pub fn now() -> Instant {
                Instant { t: unsafe { libc::mach_absolute_time() } }
            }

            pub fn sub_instant(&self, other: &Instant) -> Duration {
                let info = info();
                let diff = self.t.checked_sub(other.t)
                               .expect("second instant is later than self");
                let nanos = mul_div_u64(diff, info.numer as u64, info.denom as u64);
                Duration::new(nanos / NSEC_PER_SEC, (nanos % NSEC_PER_SEC) as u32)
            }

            pub fn add_duration(&self, other: &Duration) -> Instant {
                Instant {
                    t: self.t.checked_add(dur2intervals(other))
                           .expect("overflow when adding duration to instant"),
                }
            }

            pub fn sub_duration(&self, other: &Duration) -> Instant {
                Instant {
                    t: self.t.checked_sub(dur2intervals(other))
                           .expect("overflow when subtracting duration from instant"),
                }
            }
        }

        impl SystemTime {
            pub fn now() -> SystemTime {
                use ptr;

                let mut s = libc::timeval {
                    tv_sec: 0,
                    tv_usec: 0,
                };
                cvt(unsafe {
                    libc::gettimeofday(&mut s, ptr::null_mut())
                }).unwrap();
                return SystemTime::from(s)
            }

            pub fn sub_time(&self, other: &SystemTime)
                            -> Result<Duration, Duration> {
                self.t.sub_timespec(&other.t)
            }

            pub fn add_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.sub_duration(other) }
            }
        }

        impl From<libc::timeval> for SystemTime {
            fn from(t: libc::timeval) -> SystemTime {
                SystemTime::from(libc::timespec {
                    tv_sec: t.tv_sec,
                    tv_nsec: (t.tv_usec * 1000) as libc::c_long,
                })
            }
        }

        impl From<libc::timespec> for SystemTime {
            fn from(t: libc::timespec) -> SystemTime {
                SystemTime { t: Timespec { t: t } }
            }
        }

        impl fmt::Debug for SystemTime {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("SystemTime")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        fn dur2intervals(dur: &Duration) -> u64 {
            let info = info();
            let nanos = dur.as_secs().checked_mul(NSEC_PER_SEC).and_then(|nanos| {
                nanos.checked_add(dur.subsec_nanos() as u64)
            }).expect("overflow converting duration to nanoseconds");
            mul_div_u64(nanos, info.denom as u64, info.numer as u64)
        }

        fn info() -> &'static libc::mach_timebase_info {
            static mut INFO: libc::mach_timebase_info = libc::mach_timebase_info {
                numer: 0,
                denom: 0,
            };
            static ONCE: Once = Once::new();

            unsafe {
                ONCE.call_once(|| {
                    libc::mach_timebase_info(&mut INFO);
                });
                &INFO
            }
        }
    }

    #[cfg(not(any(target_os = "macos", target_os = "ios")))]
    mod inner {
        use fmt;
        use libc;
        use sys::cvt;
        use time::Duration;

        use super::Timespec;

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct Instant {
            t: Timespec,
        }

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct SystemTime {
            t: Timespec,
        }

        pub const UNIX_EPOCH: SystemTime = SystemTime {
            t: Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                },
            },
        };

        impl Instant {
            pub fn now() -> Instant {
                Instant { t: now(libc::CLOCK_MONOTONIC) }
            }

            pub fn sub_instant(&self, other: &Instant) -> Duration {
                self.t.sub_timespec(&other.t).unwrap_or_else(|_| {
                    panic!("other was less than the current instant")
                })
            }

            pub fn add_duration(&self, other: &Duration) -> Instant {
                Instant { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> Instant {
                Instant { t: self.t.sub_duration(other) }
            }
        }

        impl fmt::Debug for Instant {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("Instant")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        impl SystemTime {
            pub fn now() -> SystemTime {
                SystemTime { t: now(libc::CLOCK_REALTIME) }
            }

            pub fn sub_time(&self, other: &SystemTime)
                            -> Result<Duration, Duration> {
                self.t.sub_timespec(&other.t)
            }

            pub fn add_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.sub_duration(other) }
            }
        }

        impl From<libc::timespec> for SystemTime {
            fn from(t: libc::timespec) -> SystemTime {
                SystemTime { t: Timespec { t: t } }
            }
        }

        impl fmt::Debug for SystemTime {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("SystemTime")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        #[cfg(not(target_os = "dragonfly"))]
        pub type clock_t = libc::c_int;
        #[cfg(target_os = "dragonfly")]
        pub type clock_t = libc::c_ulong;

        fn now(clock: clock_t) -> Timespec {
            let mut t = Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                }
            };
            cvt(unsafe {
                libc::clock_gettime(clock, &mut t.t)
            }).unwrap();
            t
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
↑
  Move up in search results
↓
  Move down in search results
↹
  Switch tab
⏎
  Go to active search result
+ / -
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)