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 differenceflash ram before after diff before after diff 16840 16840 0 0.00% 4324 4324 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650 61312 61312 0 0.00% 6196 6196 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go 9528 9528 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go 13528 13528 0 0.00% 6796 6796 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx 8640 8640 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go 11768 11768 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 9756 9756 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 8332 8332 0 0.00% 2320 2320 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go 8084 8084 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bh1750/main.go 7392 7392 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/blinkm/main.go 70472 70472 0 0.00% 3660 3660 0 0.00% tinygo build -size short -o ./build/test.hex -target=pinetime ./examples/bma42x/main.go 63868 63868 0 0.00% 6196 6196 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmi160/main.go 27380 27380 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp180/main.go 63912 63912 0 0.00% 6228 6228 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp280/main.go 12172 12172 0 0.00% 4820 4820 0 0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bmp388/main.go 8164 8164 0 0.00% 3348 3348 0 0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/sram/main.go 22152 22152 0 0.00% 3544 3544 0 0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/time/main.go 69600 69600 0 0.00% 6376 6376 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/main.go 4580 4580 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/easystepper/main.go 69144 69144 0 0.00% 6976 6976 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/flash/console/spi 65532 65532 0 0.00% 9012 9012 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi 7172 7172 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/gc9a01/main.go 67540 67540 0 0.00% 6368 6368 0 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./examples/hub75/main.go 10116 10116 0 0.00% 6916 6916 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic 10604 10604 0 0.00% 4868 4868 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/basic 29488 29488 0 0.00% 38076 38076 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing 10136 10136 0 0.00% 6924 6924 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/scroll 10692 10692 0 0.00% 4876 4876 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/scroll 263524 263524 0 0.00% 46760 46760 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/slideshow 11692 11692 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis3dh/main.go 14036 14036 0 0.00% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/lps22hb/main.go 26092 26092 0 0.00% 2328 2328 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go 12408 12408 0 0.00% 4796 4796 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/lsm6ds3/main.go 10704 10704 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mag3110/main.go 9892 9892 0 0.00% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017/main.go 10328 10328 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017-multiple/main.go 9740 9740 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp3008/main.go 68488 68488 0 0.00% 6196 6196 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp2515/main.go 27220 27220 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./examples/pcd8544/setpixel/main.go 10516 10516 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 13748 13748 0 0.00% 3400 3400 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/sgp30 8044 8044 0 0.00% 6796 6796 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go 57300 57300 0 0.00% 3692 3692 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go 57364 57364 0 0.00% 3700 3700 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht4x/main.go 57272 57272 0 0.00% 3692 3692 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/shtc3/main.go 6612 6612 0 0.00% 2288 2288 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1306/i2c_128x32/main.go 6060 6060 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1306/spi_128x64/main.go 5808 5808 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1331/main.go 6748 6748 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7735/main.go 6660 6660 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7789/main.go 16924 16924 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go 10496 10496 0 0.00% 4540 4540 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone 10028 10028 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go 9504 9504 0 0.00% 6788 6788 0 0.00% tinygo build 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./build/test.hex -target=pico ./examples/waveshare-epd/epd2in66b/main.go 6808 6808 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/ws2812 5734 5734 0 0.00% 9538 9538 0 0.00% tinygo build -size short -o ./build/test.bin -target=m5stamp-c3 ./examples/ws2812 62324 62324 0 0.00% 5952 5952 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/is31fl3731/main.go 1581 1581 0 0.00% 598 598 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/ws2812 1056 1056 0 0.00% 180 180 0 0.00% tinygo build -size short -o ./build/test.hex -target=digispark ./examples/ws2812 31816 31816 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bme280/main.go 16412 16412 0 0.00% 4732 4732 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/microphone/main.go 11052 11052 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/buzzer/main.go 12760 12760 0 0.00% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/veml6070/main.go 6724 6724 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l293x/simple/main.go 8636 8636 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l293x/speed/main.go 6692 6692 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l9110x/simple/main.go 9244 9244 0 0.00% 4756 4756 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l9110x/speed/main.go 7308 7308 0 0.00% 3320 3320 0 0.00% tinygo build -size short -o ./build/test.hex -target=nucleo-f103rb ./examples/shiftregister/main.go 6976 6976 0 0.00% 2268 2268 0 0.00% tinygo build -size short -o ./build/test.hex -target=hifive1b ./examples/ssd1351/main.go 12964 12964 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis2mdl/main.go 8840 8840 0 0.00% 4764 4764 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/max72xx/main.go 77180 77180 0 0.00% 6344 6344 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/dht/main.go 36512 36512 0 0.00% 3988 3988 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/pcf8523/ 71208 71208 0 0.00% 6344 6344 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/alarm/ 7236 7236 0 0.00% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/clkout/ 70736 70736 0 0.00% 6340 6340 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/time/ 71168 71168 0 0.00% 6352 6352 0 0.00% tinygo build -size short -o ./build/test.hex 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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.
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).
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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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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.