mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-04 02:57:46 +00:00
Ayke van Laethem
d1fe02df23
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.
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
//go:build tinygo.riscv
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package runtime
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import "device/riscv"
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const deferExtraRegs = 0
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const callInstSize = 4 // 8 without relaxation, maybe 4 with relaxation
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// RISC-V has a maximum alignment of 16 bytes (both for RV32 and for RV64).
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// Source: https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
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func align(ptr uintptr) uintptr {
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return (ptr + 15) &^ 15
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}
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func getCurrentStackPointer() uintptr {
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return uintptr(stacksave())
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}
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// The safest thing to do here would just be to disable interrupts for
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// procPin/procUnpin. Note that a global variable is safe in this case, as any
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// access to procPinnedMask will happen with interrupts disabled.
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var procPinnedMask uintptr
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//go:linkname procPin sync/atomic.runtime_procPin
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func procPin() {
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procPinnedMask = riscv.DisableInterrupts()
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}
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//go:linkname procUnpin sync/atomic.runtime_procUnpin
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func procUnpin() {
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riscv.EnableInterrupts(procPinnedMask)
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}
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func waitForEvents() {
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mask := riscv.DisableInterrupts()
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if runqueue := schedulerRunQueue(); runqueue == nil || !runqueue.Empty() {
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riscv.Asm("wfi")
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}
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riscv.EnableInterrupts(mask)
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}
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