root/src/pkg/runtime/cgo/gcc_linux_amd64.c

DEFINITIONS

1. x_cgo_init
2. _cgo_sys_thread_start
3. threadentry

// 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 <pthread.h>
#include <string.h> // strerror
#include <signal.h>
#include "libcgo.h"

static void* threadentry(void*);
static void (*setmg_gcc)(void*, void*);

void
x_cgo_init(G* g, void (*setmg)(void*, void*))
{
        pthread_attr_t attr;
        size_t size;

        setmg_gcc = setmg;
        pthread_attr_init(&attr);
        pthread_attr_getstacksize(&attr, &size);
        g->stackguard = (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);
        ts->g->stackguard = 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;

        ts = *(ThreadStart*)v;
        free(v);

        ts.g->stackbase = (uintptr)&ts;

        /*
         * _cgo_sys_thread_start set stackguard to stack size;
         * change to actual guard pointer.
         */
        ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;

        /*
         * Set specific keys.
         */
        setmg_gcc((void*)ts.m, (void*)ts.g);

        crosscall_amd64(ts.fn);
        return nil;
}