github.com/mtsmfm/go/src@v0.0.0-20221020090648-44bdcb9f8fde/runtime/os_openbsd_syscall.go (about) 1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build openbsd && mips64 6 7 package runtime 8 9 import ( 10 "internal/abi" 11 "internal/goarch" 12 "unsafe" 13 ) 14 15 //go:noescape 16 func tfork(param *tforkt, psize uintptr, mm *m, gg *g, fn uintptr) int32 17 18 // May run with m.p==nil, so write barriers are not allowed. 19 // 20 //go:nowritebarrier 21 func newosproc(mp *m) { 22 stk := unsafe.Pointer(mp.g0.stack.hi) 23 if false { 24 print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n") 25 } 26 27 // Stack pointer must point inside stack area (as marked with MAP_STACK), 28 // rather than at the top of it. 29 param := tforkt{ 30 tf_tcb: unsafe.Pointer(&mp.tls[0]), 31 tf_tid: nil, // minit will record tid 32 tf_stack: uintptr(stk) - goarch.PtrSize, 33 } 34 35 var oset sigset 36 sigprocmask(_SIG_SETMASK, &sigset_all, &oset) 37 ret := tfork(¶m, unsafe.Sizeof(param), mp, mp.g0, abi.FuncPCABI0(mstart)) 38 sigprocmask(_SIG_SETMASK, &oset, nil) 39 40 if ret < 0 { 41 print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n") 42 if ret == -_EAGAIN { 43 println("runtime: may need to increase max user processes (ulimit -p)") 44 } 45 throw("runtime.newosproc") 46 } 47 }