github.com/m10x/go/src@v0.0.0-20220112094212-ba61592315da/runtime/os_openbsd_libc.go (about) 1 // Copyright 2020 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 "unsafe" 12 ) 13 14 var failThreadCreate = []byte("runtime: failed to create new OS thread\n") 15 16 // mstart_stub provides glue code to call mstart from pthread_create. 17 func mstart_stub() 18 19 // May run with m.p==nil, so write barriers are not allowed. 20 //go:nowritebarrierrec 21 func newosproc(mp *m) { 22 if false { 23 print("newosproc m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n") 24 } 25 26 // Initialize an attribute object. 27 var attr pthreadattr 28 if err := pthread_attr_init(&attr); err != 0 { 29 write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) 30 exit(1) 31 } 32 33 // Find out OS stack size for our own stack guard. 34 var stacksize uintptr 35 if pthread_attr_getstacksize(&attr, &stacksize) != 0 { 36 write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) 37 exit(1) 38 } 39 mp.g0.stack.hi = stacksize // for mstart 40 41 // Tell the pthread library we won't join with this thread. 42 if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 { 43 write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) 44 exit(1) 45 } 46 47 // Finally, create the thread. It starts at mstart_stub, which does some low-level 48 // setup and then calls mstart. 49 var oset sigset 50 sigprocmask(_SIG_SETMASK, &sigset_all, &oset) 51 err := pthread_create(&attr, abi.FuncPCABI0(mstart_stub), unsafe.Pointer(mp)) 52 sigprocmask(_SIG_SETMASK, &oset, nil) 53 if err != 0 { 54 write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) 55 exit(1) 56 } 57 58 pthread_attr_destroy(&attr) 59 }