gcc_linux_s390x.c

Documentation: runtime/cgo

     1// Copyright 2016 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 <pthread.h>
     6#include <string.h>
     7#include <signal.h>
     8#include "libcgo.h"
     9#include "libcgo_unix.h"
    10
    11static void *threadentry(void*);
    12
    13void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    14static void (*setg_gcc)(void*);
    15
    16void
    17x_cgo_init(G *g, void (*setg)(void*), void **tlsbase)
    18{
    19	setg_gcc = setg;
    20	_cgo_set_stacklo(g, NULL);
    21}
    22
    23void
    24_cgo_sys_thread_start(ThreadStart *ts)
    25{
    26	pthread_attr_t attr;
    27	sigset_t ign, oset;
    28	pthread_t p;
    29	size_t size;
    30	int err;
    31
    32	sigfillset(&ign);
    33	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    34
    35	pthread_attr_init(&attr);
    36	pthread_attr_getstacksize(&attr, &size);
    37	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    38	ts->g->stackhi = size;
    39	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    40
    41	pthread_sigmask(SIG_SETMASK, &oset, nil);
    42
    43	if (err != 0) {
    44		fatalf("pthread_create failed: %s", strerror(err));
    45	}
    46}
    47
    48extern void crosscall_s390x(void (*fn)(void), void *g);
    49
    50static void*
    51threadentry(void *v)
    52{
    53	ThreadStart ts;
    54
    55	ts = *(ThreadStart*)v;
    56	free(v);
    57
    58	// Save g for this thread in C TLS
    59	setg_gcc((void*)ts.g);
    60
    61	crosscall_s390x(ts.fn, (void*)ts.g);
    62	return nil;
    63}
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