| // Copyright 2009 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. |
| |
| #include <sys/types.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <string.h> |
| #include "libcgo.h" |
| |
| static void* threadentry(void*); |
| static void (*setg_gcc)(void*); |
| |
| void |
| x_cgo_init(G *g, void (*setg)(void*)) |
| { |
| pthread_attr_t attr; |
| size_t size; |
| |
| setg_gcc = setg; |
| pthread_attr_init(&attr); |
| pthread_attr_getstacksize(&attr, &size); |
| g->stacklo = (uintptr)&attr - size + 4096; |
| pthread_attr_destroy(&attr); |
| } |
| |
| |
| void |
| _cgo_sys_thread_start(ThreadStart *ts) |
| { |
| pthread_attr_t attr; |
| sigset_t ign, oset; |
| pthread_t p; |
| size_t size; |
| int err; |
| |
| sigfillset(&ign); |
| pthread_sigmask(SIG_SETMASK, &ign, &oset); |
| |
| pthread_attr_init(&attr); |
| pthread_attr_getstacksize(&attr, &size); |
| |
| // Leave stacklo=0 and set stackhi=size; mstack will do the rest. |
| ts->g->stackhi = size; |
| err = pthread_create(&p, &attr, threadentry, ts); |
| |
| pthread_sigmask(SIG_SETMASK, &oset, nil); |
| |
| if (err != 0) { |
| fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err)); |
| abort(); |
| } |
| } |
| |
| static void* |
| threadentry(void *v) |
| { |
| ThreadStart ts; |
| stack_t ss; |
| |
| ts = *(ThreadStart*)v; |
| free(v); |
| |
| /* |
| * Set specific keys. |
| */ |
| setg_gcc((void*)ts.g); |
| |
| // On NetBSD, a new thread inherits the signal stack of the |
| // creating thread. That confuses minit, so we remove that |
| // signal stack here before calling the regular mstart. It's |
| // a bit baroque to remove a signal stack here only to add one |
| // in minit, but it's a simple change that keeps NetBSD |
| // working like other OS's. At this point all signals are |
| // blocked, so there is no race. |
| memset(&ss, 0, sizeof ss); |
| ss.ss_flags = SS_DISABLE; |
| sigaltstack(&ss, nil); |
| |
| crosscall_amd64(ts.fn); |
| return nil; |
| } |