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2020-06-15Exclusive examplesGravatar Per Lindgren 1-1/+1
2020-06-13wip3, examples lock3 and lock4 now express intended use, relation to ↵Gravatar Per Lindgren 1-1/+1
Exclusive still not resolved
2020-06-13wip2Gravatar Per Lindgren 1-0/+1
2020-06-11Rename RTFM to RTICGravatar Henrik Tjäder 2-9/+9
2020-06-11FmtGravatar Emil Fresk 1-1/+0
2020-05-26touch src/lib.rsGravatar Jorge Aparicio 1-0/+1
2020-01-24Merge #295Gravatar bors[bot] 1-0/+4
295: docs: do not use Instant::now in #[init] r=korken89 a=japaric Co-authored-by: Jorge Aparicio <jorge@japaric.io>
2020-01-21docs: do not use Instant::now in #[init]Gravatar Jorge Aparicio 1-0/+4
2019-11-19Merge #277Gravatar bors[bot] 1-0/+7
277: TimerQueue.dequeue: don't set SYST reload to 0 r=korken89 a=mpasternacki ARM Architecture Reference Manual says: "Setting SYST_RVR to zero has the effect of disabling the SysTick counter independently of the counter enable bit." If Monotonic's ratio is less than one, the timeout calculations can compute zero if next task is scheduled after current instant, but before next timer tick. This results in disabling SYST and freezing the timer queue. The division by ratio's denominator rounds downward and the dequeue condition is `if instant < now`. If ratio is small enough, this results in unnecessary interrupts: Let's say `instant - now` is 99 and ratio is 1/25. Then, `dur` will equal 3 and the next tick will happen at `now + 75`. In the next interrupt, `instant > now` and additional tick needs to be scheduled (which doesn't happen, because now `instant - now` is less than 25, so reload will be set to 0 and timer queue will stop). Adding one to computed duration will prevent both freezing and additional interrupts. When ratio is 1 or close, timer queue code overhead will prevent this from happening. I am working with a chip where CPU is clocked at 600MHz and SysTick is 100kHz and the freeze happens quite often. Co-authored-by: Maciej Pasternacki <maciej@3ofcoins.net>
2019-11-19TimerQueue.dequeue: don't set SYST reload to 0Gravatar Maciej Pasternacki 1-0/+7
ARM Architecture Reference Manual says: "Setting SYST_RVR to zero has the effect of disabling the SysTick counter independently of the counter enable bit." If Monotonic's ratio is less than one, the timeout calculations can compute zero if next task is scheduled after current instant, but before next timer tick. This results in disabling SYST and freezing the timer queue.
2019-11-18Fixed internal overflow on subtraiton in elapsed and durationGravatar Per Lindgren 1-2/+4
2019-11-13Minor docs update to monotonicGravatar Emil Fresk 1-2/+4
2019-10-15cyccnt::Instant: simplify the Send / Sync implGravatar Jorge Aparicio 1-13/+2
originally the type was made `!Send` because it loses its meaning when send from one core to another but that was an incorrect use of the `Send` bound (the send operation makes the value incorrect but that doesn't cause memory unsafety on its own). So later the type was (explicitly) made `Send` again resulting in a convoluted implementation -- this commit simplifies things.
2019-10-15document the limitations of cyccnt::{Instant,Duration}Gravatar Jorge Aparicio 1-5/+19
2019-10-15more monotonic timer docsGravatar Jorge Aparicio 1-0/+12
covers - initialization and configuration of the timer; this is now a responsibility of the application author - correctness of `Monotonic::now()` in `#[init]` - safety of `Monotonic::reset()` closes #251
2019-09-15One more place updatedGravatar Emil Fresk 1-1/+1
2019-09-15don't use deprecated APIGravatar Jorge Aparicio 1-1/+1
2019-08-21doc tweaksGravatar Jorge Aparicio 1-1/+4
2019-08-21document #[app]Gravatar Jorge Aparicio 1-5/+3
2019-07-11change Monotonic::ratio return type to FractionGravatar Jorge Aparicio 3-11/+29
2019-06-24Monotonic trait is safe; add MultiCore traitGravatar Jorge Aparicio 3-2/+17
2019-06-18add homogeneous multi-core supportGravatar Jorge Aparicio 1-1/+1
2019-06-13rtfm-syntax refactor + heterogeneous multi-core supportGravatar Jorge Aparicio 4-324/+362
2019-05-21bump heapless dependency to v0.5.0; remove "nightly" featureGravatar Jorge Aparicio 1-2/+2
with the upcoming version of heapless we are able to initialize all internal queues in const context removing the need for late initialization this commit also removes the "nightly" feature because all the optimization provided by it are now enabled by default
2019-05-21removes the maybe_uninit feature gateGravatar Jorge Aparicio 2-31/+0
and stop newtyping `core::mem::MaybeUninit`
2019-05-01implement RFCs 147 and 155, etc.Gravatar Jorge Aparicio 3-150/+73
This commit: - Implements RFC 147: "all functions must be safe" - Implements RFC 155: "explicit Context parameter" - Implements the pending breaking change #141: reject assign syntax in `init` (which was used to initialize late resources) - Refactors code generation to make it more readable -- there are no more random identifiers in the output -- and align it with the book description of RTFM internals. - Makes the framework hard depend on `core::mem::MaybeUninit` and thus will require nightly until that API is stabilized. - Fixes a ceiling analysis bug where the priority of the system timer was not considered in the analysis. - Shrinks the size of all the internal queues by turning `AtomicUsize` indices into `AtomicU8`s. - Removes the integration with `owned_singleton`.
2019-04-16more nightly fixesGravatar Jorge Aparicio 1-3/+3
2019-04-16[NFC] fix nightly ciGravatar Jorge Aparicio 1-3/+3
2019-02-23Merge #153Gravatar bors[bot] 2-19/+60
153: add "nightly" feature; replace hint::unreachable_unchecked with a panic r=korken89 a=japaric this implements the action plan described in #149 to give you a sense of the overhead of this change: it has increased the binary size of some of our examples by up to 10% but this is mainly from pulling in a panic handler that does formatting r? @korken89 Co-authored-by: Jorge Aparicio <jorge@japaric.io>
2019-02-19add Duration.as_cyclesGravatar Jorge Aparicio 1-0/+8
2019-02-19turn all potential UB into panicsGravatar Jorge Aparicio 1-30/+8
2019-02-19document the nightly featureGravatar Jorge Aparicio 1-0/+5
2019-02-19add "nightly" featureGravatar Jorge Aparicio 2-4/+62
2019-02-16cargo fmtGravatar Jorge Aparicio 1-1/+3
2019-02-16make debug builds reproducibleGravatar Jorge Aparicio 1-2/+25
2019-02-12document MSRV and SemVer policyGravatar Jorge Aparicio 1-0/+14
2019-02-11change layout of booksGravatar Jorge Aparicio 1-1/+1
2019-02-08impl Default for DurationGravatar Jorge Aparicio 1-1/+1
2019-01-09Absolute link to the book so it works on crates.ioGravatar Eddy Petrișor 1-1/+1
Signed-off-by: Eddy Petrișor <eddy.petrisor@gmail.com>
2018-12-17note that entering / leaving a critical section is always constant timeGravatar Jorge Aparicio 1-1/+2
2018-12-16note that the timer queue is not supported on ARMv6-MGravatar Jorge Aparicio 1-0/+5
2018-12-16use edition idioms in the top crateGravatar Jorge Aparicio 1-2/+2
2018-12-16properly handle #[cfg] (conditional compilation) on resourcesGravatar Jorge Aparicio 1-1/+0
2018-12-16use the single core variant of spsc::QueueGravatar Jorge Aparicio 1-3/+3
2018-11-04impl Mutex on all shared resourcesGravatar Jorge Aparicio 3-71/+143
document how to write generic code that operates on resources
2018-11-03fix some linksGravatar Jorge Aparicio 1-1/+1
2018-11-03v0.4.0Gravatar Jorge Aparicio 13-844/+523
closes #32 closes #33
2018-08-24more fixesGravatar Jorge Aparicio 10-17/+9
2018-01-15fix documentation linkGravatar Jorge Aparicio 1-1/+1
2018-01-15v0.3.0Gravatar Jorge Aparicio 5-6/+43
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