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26 lines
643 B
Rust
26 lines
643 B
Rust
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//! Bookkeeping to make sure only one long-running operation is executed.
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#[derive(Default)]
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pub(crate) struct OpQueue {
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op_scheduled: bool,
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op_in_progress: bool,
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}
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impl OpQueue {
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pub(crate) fn request_op(&mut self) {
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self.op_scheduled = true;
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}
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pub(crate) fn should_start_op(&mut self) -> bool {
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if !self.op_in_progress && self.op_scheduled {
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self.op_in_progress = true;
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self.op_scheduled = false;
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return true;
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}
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false
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}
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pub(crate) fn op_completed(&mut self) {
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assert!(self.op_in_progress);
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self.op_in_progress = false;
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}
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}
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