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sync: implement WaitGroup using a futex #4573

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sync: implement WaitGroup using a futex #4573

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@aykevl aykevl commented Oct 31, 2024 •
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This prepares sync.WaitGroup for multithreading.
Code size for the cooperative scheduler is nearly unchanged.

This PR depends on #4560 and #4549.

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github-actions bot commented Oct 31, 2024 •
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Size difference with the dev branch:

Binary size difference 
not 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
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 245500  245500      0   0.00%   10488   10488      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
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 111572  111572      0   0.00%    7772    7772      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 154224  154224      0   0.00%    6540    6540      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
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 286096  286260    164   0.06%   17812   17812      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 287108  287272    164   0.06%   18212   18212      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
 338452  338624    172   0.05%   15396   15396      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
5333026 5333526    500   0.00%  811790  811790      0   0.00%

@aykevl
internal/task: add non-atomic atomic operations
98eeb79 
This adds some non-atomic types that have the same interface as the ones
in sync/atomic.

We currently don't need these to be atomic (because the scheduler is
entirely cooperative), but once we add support for a scheduler with
multiple threads and/or preemptive scheduling we can trivially add some
type aliases under a different build tag in the future when real
atomicity is needed for threading.
@aykevl
internal/task: add cooperative implementation of Futex
b9d285d 
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
@aykevl
sync: implement WaitGroup using a futex
f6c291a 
This prepares sync.WaitGroup for multithreading.
Code size for the cooperative scheduler is nearly unchanged.
@aykevl aykevl marked this pull request as ready for review November 20, 2024 13:46
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aykevl commented Nov 20, 2024

Rebased, this PR should be ready now.

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@dgryski dgryski Awaiting requested review from dgryski

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