WIP: threading support #4559
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WIP: threading support #4559
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This adds an internal/llsync package that provides low level synchronisation primitives for the runtime and sync packages. The atomic types are currently not atomic, but since they share the same API with sync/atomic we can trivially add some type aliases under a different build tag in the future when real atomicity is needed for threading.
This uses the internal/llsync package to convert some non-atomic operations to pseudo-atomic operations that will become truly atomic on systems that need this (such as multicore chips and when we implement true parallelism on Linux).
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.
See the code comments for details. But in short, this implements a futex for the cooperative scheduler (that is single threaded and non-reentrant). Similar implementations can be made for basically every other operating system, and even WebAssembly with the threading (actually: atomics) proposal. Using this basic futex implementation means we can use the same implementation for synchronisation primitives on cooperative and multicore systems. For more information on futex across operating systems: https://outerproduct.net/futex-dictionary.html
PMutex is a mutex when threading is possible, and a dummy mutex-like object (that doesn't do anything) otherwise.
Code size for the cooperative scheduler is nearly unchanged.
Make sure the object is locked when trying to modify it. Binary size seems unaffected when not using threading.
Volatile loads/stors are only useful for communication with interrupts
or for memory-mapped I/O. They do not provide any sort of safety for
sync.Mutex, while making it *appear* as if it is more safe.
* `sync.Mutex` cannot be used safely inside interrupts, because any
blocking calls (including `Lock`) will cause a runtime panic.
* For multithreading, `volatile` is also the wrong choice. Atomic
operations should be used instead, and the current code would not
work for multithreaded programs anyway.
This was referenced Oct 28, 2024
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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
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103072 103196 124 0.12% 9816 9808 -8 -0.08% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
117012 117160 148 0.13% 13132 13124 -8 -0.06% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
85892 86072 180 0.21% 5140 5140 0 0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
5267020 5268296 1276 0.00% 786474 786334 -140 -0.00%
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Work in progress. Many necessary parts are not yet implemented, but this gives context for PRs I want to make in the future.
See #2446 for motivation (in particular, why this focuses on Linux first) and for a list of things that need to be implemented to make multithreading work in TinyGo.