This is not a scheduler in the runtime, instead every goroutine is
mapped to a single OS thread - meaning 1:1 scheduling.
While this may not perform well (or at all) for large numbers of
threads, it greatly simplifies many things in the runtime. For example,
blocking syscalls can be called directly instead of having to use epoll
or similar. Also, we don't need to do anything special to call C code -
the default stack is all we need.
Somewhat surprisingly, this results in smaller code than the old code
with the cooperative (tasks) scheduler. Probably because the new RWMutex
is also simpler.
Using a global lock may be slow, but it is certainly simple and safe.
If this global lock becomes a bottleneck, we can of course look into
making the GC truly support multithreading.
Instead of just incrementing the timestamp, this causes the system to
actually sleep when calling time.Sleep. The direct effect is that this
works as expected:
$ tinygo run -target=riscv-qemu examples/serial
hello world!
hello world!
hello world!
[..etc]
This commit also adds a bare bones handler for exceptions (such as
invalid memory writes), since we're adding an interrupt handler anyway.
While this patch doesn't add that much functionality, having interrupt
support is going to be needed for multicore support on riscv-qemu. My
plan is to first add this support to riscv-qemu (based on the earlier
work I did for the RP2040 and demoed at FOSDEM 2025) and once the basics
are in place and fully tested we can extend this support to the RP2040.
Writing for QEMU first makes it much easier to debug any issues that
will come up.
This directive caused the code to be put in a non-executable area on
Windows which caused a segmentation fault. This patch fixes the issue by
removing `.section` directives, fixing windows/arm64 support.
I'm surprised this worked as long as it did, since it looks like the
goroutine stack did not get scanned. Or maybe the RCX register contained
the stack pointer by accident. In any case, it now uses the correct
register (RCX instead of RDI on Windows) for passing the stack pointer
as the first parameter.
This adds support for the well-known Boehm GC. It's significantly faster
than our own naive GC and could be used as an alternative on bigger
systems.
In the future, this GC might also be supported on WebAssembly with some
extra work. Right now it's Linux only (though Windows/MacOS shouldn't be
too difficult to add).
For example, with -gc=none and -gc=leaking, no heap needs to be
allocated when initializing the runtime. And some GCs (like -gc=custom)
are responsible for allocating the heap themselves.
* machine/rp2350: add flash support for rp2350
* combine duplicate files
* clean things up and group by source file
* add stubbed out xip cache clean func if needed in the future
* update flash_enable_xip_via_boot2
* remove unused macros and fix inconsistent formatting
* make flash size configurable like rp2040
* add missing flash size configs
* retain big Go CGo compatibility per #4103
* clarify CS0_SIZE source and remove single-use typedef
Don't block forever if there's nothing to receive. On the other hand,
process the entire FIFO, not just a single byte.
This fixes an issue where the rp2350 would hang after programming through
openocd, where the UART0 interrupt would be spuriously pending.
Right now it doesn't compile, with errors like the following:
# machine
/app/tinygo/src/machine/board_pico.go:7:13: undefined: GPIO0
/app/tinygo/src/machine/board_pico.go:8:13: undefined: GPIO1
/app/tinygo/src/machine/board_pico.go:9:13: undefined: GPIO2
/app/tinygo/src/machine/board_pico.go:10:13: undefined: GPIO3
[...etc...]
This patch should fix that.
* machine: add support for core voltage adjustments to rp2040
In preparation for bumping the core frequency of the rp2040, this
change implements the required core voltage adjustment logic.
* machine: bump rp2040 to 200MHz
Follow-up to #4728 which implemented the algorithm for finding the
dividers.
The calculation is computed at compile time by interp, as verified by
building example/blinky1 for -target pico.
The upstream one assumes it's running on a Unix system (which makes
sense), but this package is also used on baremetal. So replace it on
systems that need a replaced syscall package.
Ayke van Laethem
Caleb Champlin
Randy Reddig
Michael Smith
あーるどん
soypat
Ron Evans
Elias Naur