runtime: move scheduler code around #4549
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Size difference with the dev branch: Binary size differencenot the same command!
tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
go: downloading tinygo.org/x/tinyfont v0.3.0
not the same command!
tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
go: downloading golang.org/x/net v0.7.0
not the same command!
tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
go: downloading github.com/soypat/natiu-mqtt v0.5.1
not the same command!
tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
go: downloading github.com/eclipse/paho.mqtt.golang v1.2.0
flash ram
before after diff before after diff
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aykevl
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Note: this PR conflicts with some changes I'd like to make to the sync package to make it thread-safe, so waiting until this one is merged before I submit those other PRs (see #4559). |
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Rebased to resolve merge conflicts. |
eliasnaur
reviewed
Nov 9, 2024
src/runtime/arch_tinygoriscv.go
Outdated
| @@ -36,7 +36,8 @@ func procUnpin() { | |||
|
|
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| func waitForEvents() { | |||
| mask := riscv.DisableInterrupts() | |||
| if !runqueue.Empty() { | |||
| runqueue := schedulerRunQueue() | |||
| if !(runqueue != nil && runqueue.Empty()) { | |||
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Nit: runqueue == nil || !runqueue.Empty() is clearer to me, but I understand why you write it like this.
Nittier: if rq := schedulerRunQueue(); rq == nil || !rq.Empty() {
src/runtime/scheduler_none.go
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| // This function is not actually used, it is only called when hasScheduler | ||
| // is true. So we can just return nil here. | ||
| return nil |
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Nit: panic("unreachable") like scheduler below?
src/runtime/scheduler_none.go
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| func scheduler(returnAtDeadlock bool) { | ||
| // This *should* be unreachable. |
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@aykevl this PR needs to be rebased against |
This moves all scheduler code into a separate file that is only compiled
when there's a scheduler in use (the tasks or asyncify scheduler, which
are both cooperative). The main goal of this change is to make it easier
to add a new "scheduler" based on OS threads.
It also fixes a few subtle issues with `-gc=none`:
- Gosched() panicked. This is now fixed to just return immediately
(the only logical thing to do when there's only one goroutine).
- Timers aren't supported without a scheduler, but the relevant code
was still present and would happily add a timer to the queue. It
just never ran. So now it exits with a runtime error, similar to any
blocking operation.
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Rebased, and fixed the review issues pointed out by @eliasnaur (thanks for the review!). |
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This moves all scheduler code into a separate file that is only compiled when there's a scheduler in use (the tasks or asyncify scheduler, which are both cooperative). The main goal of this change is to make it easier to add a new "scheduler" based on OS threads.
It also fixes a few subtle issues with
-gc=none:runtime.Gosched()panicked. This is now fixed to just return immediately (the only logical thing to do when there's only one goroutine).Other than that, this really just moves code around.