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trans-scheduler: Let main thread take over for other worker.

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This commit is contained in:
Michael Woerister 2017-08-09 18:18:48 +02:00
parent c2de81f4c9
commit 07149e03f4
1 changed files with 10 additions and 0 deletions
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10
src/librustc_trans/back/write.rs
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@ -1356,6 +1356,16 @@ fn start_executing_work(sess: &Session,
maybe_start_llvm_timer(&item, &mut llvm_start_time);
main_thread_worker_state = MainThreadWorkerState::LLVMing;
spawn_work(cgcx, item);
} else {
// There is no unstarted work, so let the main thread
// take over for a running worker. Otherwise the
// implicit token would just go to waste.
// We reduce the `running` counter by one. The
// `tokens.truncate()` below will take care of
// giving the Token back.
debug_assert!(running > 0);
running -= 1;
main_thread_worker_state = MainThreadWorkerState::LLVMing;
}
}
MainThreadWorkerState::Translating => {