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Text file src/runtime/cgo/gcc_netbsd_386.c

Documentation: runtime/cgo

     1	// Copyright 2009 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	#include <sys/types.h>
     6	#include <pthread.h>
     7	#include <signal.h>
     8	#include <string.h>
     9	#include "libcgo.h"
    10	#include "libcgo_unix.h"
    11	
    12	static void* threadentry(void*);
    13	static void (*setg_gcc)(void*);
    14	
    15	void
    16	x_cgo_init(G *g, void (*setg)(void*))
    17	{
    18		pthread_attr_t attr;
    19		size_t size;
    20	
    21		setg_gcc = setg;
    22		pthread_attr_init(&attr);
    23		pthread_attr_getstacksize(&attr, &size);
    24		g->stacklo = (uintptr)&attr - size + 4096;
    25		pthread_attr_destroy(&attr);
    26	}
    27	
    28	
    29	void
    30	_cgo_sys_thread_start(ThreadStart *ts)
    31	{
    32		pthread_attr_t attr;
    33		sigset_t ign, oset;
    34		pthread_t p;
    35		size_t size;
    36		int err;
    37	
    38		sigfillset(&ign);
    39		pthread_sigmask(SIG_SETMASK, &ign, &oset);
    40	
    41		pthread_attr_init(&attr);
    42		pthread_attr_getstacksize(&attr, &size);
    43		// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    44		ts->g->stackhi = size;
    45		err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    46	
    47		pthread_sigmask(SIG_SETMASK, &oset, nil);
    48	
    49		if (err != 0) {
    50			fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    51			abort();
    52		}
    53	}
    54	
    55	static void*
    56	threadentry(void *v)
    57	{
    58		ThreadStart ts;
    59		stack_t ss;
    60	
    61		ts = *(ThreadStart*)v;
    62		free(v);
    63	
    64		/*
    65		 * Set specific keys.
    66		 */
    67		setg_gcc((void*)ts.g);
    68	
    69		// On NetBSD, a new thread inherits the signal stack of the
    70		// creating thread. That confuses minit, so we remove that
    71		// signal stack here before calling the regular mstart. It's
    72		// a bit baroque to remove a signal stack here only to add one
    73		// in minit, but it's a simple change that keeps NetBSD
    74		// working like other OS's. At this point all signals are
    75		// blocked, so there is no race.
    76		memset(&ss, 0, sizeof ss);
    77		ss.ss_flags = SS_DISABLE;
    78		sigaltstack(&ss, nil);
    79	
    80		crosscall_386(ts.fn);
    81		return nil;
    82	}

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