github.com/lzhfromustc/gofuzz@v0.0.0-20211116160056-151b3108bbd1/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 // +build openbsd,!amd64 6 // +build openbsd,!arm64 7 8 package runtime 9 10 import ( 11 "runtime/internal/sys" 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 //go:nowritebarrier 20 func newosproc(mp *m) { 21 stk := unsafe.Pointer(mp.g0.stack.hi) 22 if false { 23 print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n") 24 } 25 26 // Stack pointer must point inside stack area (as marked with MAP_STACK), 27 // rather than at the top of it. 28 param := tforkt{ 29 tf_tcb: unsafe.Pointer(&mp.tls[0]), 30 tf_tid: nil, // minit will record tid 31 tf_stack: uintptr(stk) - sys.PtrSize, 32 } 33 34 var oset sigset 35 sigprocmask(_SIG_SETMASK, &sigset_all, &oset) 36 ret := tfork(¶m, unsafe.Sizeof(param), mp, mp.g0, funcPC(mstart)) 37 sigprocmask(_SIG_SETMASK, &oset, nil) 38 39 if ret < 0 { 40 print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n") 41 if ret == -_EAGAIN { 42 println("runtime: may need to increase max user processes (ulimit -p)") 43 } 44 throw("runtime.newosproc") 45 } 46 }