mirror of
https://github.com/make-42/xyosc
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38 lines
1.3 KiB
Go
38 lines
1.3 KiB
Go
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// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
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//go:build !cgo && (darwin || freebsd || linux)
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package fakecgo
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import "unsafe"
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// _cgo_thread_start is split into three parts in cgo since only one part is system dependent (keep it here for easier handling)
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// _cgo_thread_start(ThreadStart *arg) (runtime/cgo/gcc_util.c)
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// This get's called instead of the go code for creating new threads
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// -> pthread_* stuff is used, so threads are setup correctly for C
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// If this is missing, TLS is only setup correctly on thread 1!
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// This function should be go:systemstack instead of go:nosplit (but that requires runtime)
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//
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//go:nosplit
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//go:norace
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func x_cgo_thread_start(arg *ThreadStart) {
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var ts *ThreadStart
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// Make our own copy that can persist after we return.
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// _cgo_tsan_acquire();
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ts = (*ThreadStart)(malloc(unsafe.Sizeof(*ts)))
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// _cgo_tsan_release();
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if ts == nil {
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println("fakecgo: out of memory in thread_start")
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abort()
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}
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// *ts = *arg would cause a writebarrier so copy using slices
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s1 := unsafe.Slice((*uintptr)(unsafe.Pointer(ts)), unsafe.Sizeof(*ts)/8)
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s2 := unsafe.Slice((*uintptr)(unsafe.Pointer(arg)), unsafe.Sizeof(*arg)/8)
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for i := range s2 {
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s1[i] = s2[i]
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}
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_cgo_sys_thread_start(ts) // OS-dependent half
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}
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