Prepare leaking GC for multithreading #4560
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Note: not super convinced about the "llsync" name (meaning "low level sync"). Others I have considered: "sync" (can be confused by the stdlib sync package), "atomic" (same), "futex" (there's more in there than just futexes), "mutex" (it's more than mutexes), "internalsync" (too long), etc. |
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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
16864 16864 0 0.00% 4324 4324 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
61432 61432 0 0.00% 6196 6196 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go
9568 9568 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go
13564 13564 0 0.00% 6796 6796 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx
8680 8680 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go
11800 11800 0 0.00% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go
9796 9796 0 0.00% 4768 4768 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/itsybitsy-m0/main.go
8368 8368 0 0.00% 2320 2320 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go
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69256 69256 0 0.00% 6976 6976 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/flash/console/spi
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10528 10528 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/hd44780i2c/main.go
14724 14724 0 0.00% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/hts221/main.go
16148 16148 0 0.00% 2360 2360 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hub75/main.go
10152 10152 0 0.00% 6916 6916 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic
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29504 29504 0 0.00% 38076 38076 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing
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26132 26132 0 0.00% 2328 2328 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go
12448 12448 0 0.00% 4796 4796 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/lsm6ds3/main.go
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27260 27260 0 0.00% 3648 3648 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/microbitmatrix/main.go
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8240 8240 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go
8148 8148 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mpu6050/main.go
75856 75856 0 0.00% 7480 7480 0 0.00% tinygo build -size short -o ./build/test.hex -target=p1am-100 ./examples/p1am/main.go
12252 12252 0 0.00% 3352 3352 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/pca9685/main.go
6228 6228 0 0.00% 3288 3288 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setbuffer/main.go
5260 5260 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setpixel/main.go
10536 10536 0 0.00% 3328 3328 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/seesaw
2825 2825 0 0.00% 558 558 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/servo
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5844 5844 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1331/main.go
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10068 10068 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go
10868 10868 0 0.00% 3340 3340 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/touch/capacitive
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14980 14980 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl53l1x/main.go
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24700 24700 0 0.00% 13892 13892 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840-sense ./examples/waveshare-epd/epd1in54/main.go
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7012 7012 0 0.00% 2268 2268 0 0.00% tinygo build -size short -o ./build/test.hex -target=hifive1b ./examples/ssd1351/main.go
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77292 77292 0 0.00% 6344 6344 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/dht/main.go
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Actually I realized I'd like to be able to use these synchronization primitives inside the internal/task package and some synchronization primitives (such as the pseudo-futex for the non-threaded scheduler) need internal/task. So that's going to be a circular dependency. Therefore I've moved the new stuff into the internal/task package as well, to simplify things. This nicely sidesteps the naming question :) |
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Can someone take a look at this PR? |
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Not a maintainer, but LGTM. The changes are fairly harmless: adding the passthrough |
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I think there's more than just sprinkling a few atomics onto some integers to truly make this thread-safe. For example, the growing logic and checking |
Oops, you are correct! I believe it's correct for a non-growing heap, but that's only the case on microcontrollers. |
PMutex is a mutex when threading is possible, and a dummy mutex-like object (that doesn't do anything) otherwise.
This uses the task.PMutex parallel-only-mutex type to make the leaking GC parallelism safe. The task.PMutex type is currently a no-op but will become a real mutex once we add true parallelism.
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Updated the PR. With |
dgryski
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Nov 19, 2024
| @@ -43,6 +48,8 @@ func alloc(size uintptr, layout unsafe.Pointer) unsafe.Pointer { | |||
| // Failed to make the heap bigger, so we must really be out of memory. | |||
| runtimePanic("out of memory") | |||
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Unlock mutex before throwing panic?
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It's a runtime panic, which cannot be recovered from. So unlocking the mutex won't help anybody.
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Any other feedback on this PR @dgryski ? |
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This makes the leaking GC (
-gc=leaking) ready for multithreading. The leaking GC is the easiest real heap allocator to add support for, since it can increment the heap pointer with a simple atomic add operation.This PR does not actually make the leaking GC support multithreading, but it makes it very easy to do so in the future simply by changing the new llsync package (see #4559).
This is the first PR of (hopefully) a bunch to follow that will gradually add support for multithreading to various parts of TinyGo. I split it in many pieces to make it hopefully easier to review.
This PR is intended to be merged by rebasing.