go os_openbsd_libc 源码
golang os_openbsd_libc 代码
文件路径：/src/runtime/os_openbsd_libc.go
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build openbsd && !mips64
package runtime
import (
"internal/abi"
"unsafe"
)
var failThreadCreate = []byte("runtime: failed to create new OS thread\n")
// mstart_stub provides glue code to call mstart from pthread_create.
func mstart_stub()
// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrierrec
func newosproc(mp *m) {
if false {
print("newosproc m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n")
}
// Initialize an attribute object.
var attr pthreadattr
if err := pthread_attr_init(&attr); err != 0 {
write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate)))
exit(1)
}
// Find out OS stack size for our own stack guard.
var stacksize uintptr
if pthread_attr_getstacksize(&attr, &stacksize) != 0 {
write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate)))
exit(1)
}
mp.g0.stack.hi = stacksize // for mstart
// Tell the pthread library we won't join with this thread.
if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate)))
exit(1)
}
// Finally, create the thread. It starts at mstart_stub, which does some low-level
// setup and then calls mstart.
var oset sigset
sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
err := pthread_create(&attr, abi.FuncPCABI0(mstart_stub), unsafe.Pointer(mp))
sigprocmask(_SIG_SETMASK, &oset, nil)
if err != 0 {
write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate)))
exit(1)
}
pthread_attr_destroy(&attr)
}
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