# Struct cargo::core::compiler::job_queue::DrainState

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    struct DrainState<'cfg> {Show 18 fields
        total_units: usize,
        queue: DependencyQueue<Unit, Artifact, Job>,
        messages: Arc<Queue<Message>>,
        diag_dedupe: DiagDedupe<'cfg>,
        warning_count: HashMap<JobId, WarningCount>,
        active: HashMap<JobId, Unit>,
        compiled: HashSet<PackageId>,
        documented: HashSet<PackageId>,
        scraped: HashSet<PackageId>,
        counts: HashMap<PackageId, usize>,
        progress: Progress<'cfg>,
        next_id: u32,
        timings: Timings<'cfg>,
        tokens: Vec<Acquired>,
        pending_queue: Vec<(Unit, Job, usize)>,
        print: DiagnosticPrinter<'cfg>,
        finished: usize,
        per_package_future_incompat_reports: Vec<FutureIncompatReportPackage>,
    }

Expand description

This structure is backed by the `DependencyQueue` type and manages the actual compilation step of each package. Packages enqueue units of work and then later on the entire graph is processed and compiled.

It is created from JobQueue when we have fully assembled the crate graph (i.e., all package dependencies are known).

## Fields§

§`total_units: usize`§`queue: DependencyQueue<Unit, Artifact, Job>`§`messages: Arc<Queue<Message>>`§`diag_dedupe: DiagDedupe<'cfg>`

Diagnostic deduplication support.

§`warning_count: HashMap<JobId, WarningCount>`

Count of warnings, used to print a summary after the job succeeds

§`active: HashMap<JobId, Unit>`§`compiled: HashSet<PackageId>`§`documented: HashSet<PackageId>`§`scraped: HashSet<PackageId>`§`counts: HashMap<PackageId, usize>`§`progress: Progress<'cfg>`§`next_id: u32`§`timings: Timings<'cfg>`§`tokens: Vec<Acquired>`

Tokens that are currently owned by this Cargo, and may be “associated” with a rustc process. They may also be unused, though if so will be dropped on the next loop iteration.

Note that the length of this may be zero, but we will still spawn work, as we share the implicit token given to this Cargo process with a single rustc process.

§`pending_queue: Vec<(Unit, Job, usize)>`

The list of jobs that we have not yet started executing, but have retrieved from the `queue`. We eagerly pull jobs off the main queue to allow us to request jobserver tokens pretty early.

§`print: DiagnosticPrinter<'cfg>`§`finished: usize`

How many jobs we’ve finished

§`per_package_future_incompat_reports: Vec<FutureIncompatReportPackage>`

## Implementations§

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### impl<'cfg> DrainState<'cfg>

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#### fn spawn_work_if_possible<'s>( &mut self, cx: &mut Context<'_, '_>, jobserver_helper: &HelperThread, scope: &'s Scope<'s, '_> ) -> CargoResult<()>

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#### fn has_extra_tokens(&self) -> bool

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#### fn handle_event( &mut self, cx: &mut Context<'_, '_>, plan: &mut BuildPlan, event: Message ) -> Result<(), ErrorToHandle>

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#### fn wait_for_events(&mut self) -> Vec<Message>

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#### fn drain_the_queue<'s>( self, cx: &mut Context<'_, '_>, plan: &mut BuildPlan, scope: &'s Scope<'s, '_>, jobserver_helper: &HelperThread ) -> Option<Error>

This is the “main” loop, where Cargo does all work to run the compiler.

This returns an Option to prevent the use of `?` on `Result` types because it is important for the loop to carefully handle errors.

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#### fn handle_error( &self, shell: &mut Shell, err_state: &mut ErrorsDuringDrain, new_err: impl Into<ErrorToHandle> )

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#### fn tick_progress(&mut self)

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#### fn name_for_progress(&self, unit: &Unit) -> String

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#### fn run<'s>( &mut self, unit: &Unit, job: Job, cx: &Context<'_, '_>, scope: &'s Scope<'s, '_> )

Executes a job.

Fresh jobs block until finished (which should be very fast!), Dirty jobs will spawn a thread in the background and return immediately.

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#### fn emit_warnings( &mut self, msg: Option<&str>, unit: &Unit, cx: &mut Context<'_, '_> ) -> CargoResult<()>

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#### fn bump_warning_count(&mut self, id: JobId, emitted: bool, fixable: bool)

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#### fn report_warning_count( &mut self, config: &Config, id: JobId, rustc_workspace_wrapper: &Option<PathBuf> )

Displays a final report of the warnings emitted by a particular job.

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#### fn finish( &mut self, id: JobId, unit: &Unit, artifact: Artifact, cx: &mut Context<'_, '_> ) -> CargoResult<()>

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#### fn note_working_on( &mut self, config: &Config, ws_root: &Path, unit: &Unit, fresh: &Freshness ) -> CargoResult<()>

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#### fn back_compat_notice( &self, cx: &Context<'_, '_>, unit: &Unit ) -> CargoResult<()>

## Auto Trait Implementations§

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### impl<'cfg> !RefUnwindSafe for DrainState<'cfg>

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### impl<'cfg> !Send for DrainState<'cfg>

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### impl<'cfg> !Sync for DrainState<'cfg>

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### impl<'cfg> Unpin for DrainState<'cfg>

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### impl<'cfg> !UnwindSafe for DrainState<'cfg>

## Blanket Implementations§

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## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1176 bytes