gcc_freebsd_amd64.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 <errno.h>
     7#include <sys/signalvar.h>
     8#include <pthread.h>
     9#include <signal.h>
    10#include <string.h>
    11#include "libcgo.h"
    12#include "libcgo_unix.h"
    13
    14static void* threadentry(void*);
    15static void (*setg_gcc)(void*);
    16
    17void
    18x_cgo_init(G *g, void (*setg)(void*))
    19{
    20	uintptr *pbounds;
    21
    22	// Deal with memory sanitizer/clang interaction.
    23	// See gcc_linux_amd64.c for details.
    24	setg_gcc = setg;
    25	pbounds = (uintptr*)malloc(2 * sizeof(uintptr));
    26	if (pbounds == NULL) {
    27		fatalf("malloc failed: %s", strerror(errno));
    28	}
    29	_cgo_set_stacklo(g, pbounds);
    30	free(pbounds);
    31}
    32
    33void
    34_cgo_sys_thread_start(ThreadStart *ts)
    35{
    36	pthread_attr_t attr;
    37	sigset_t ign, oset;
    38	pthread_t p;
    39	size_t size;
    40	int err;
    41
    42	SIGFILLSET(ign);
    43	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    44
    45	pthread_attr_init(&attr);
    46	pthread_attr_getstacksize(&attr, &size);
    47	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    48	ts->g->stackhi = size;
    49	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    50
    51	pthread_sigmask(SIG_SETMASK, &oset, nil);
    52
    53	if (err != 0) {
    54		fatalf("pthread_create failed: %s", strerror(err));
    55	}
    56}
    57
    58extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    59static void*
    60threadentry(void *v)
    61{
    62	ThreadStart ts;
    63
    64	ts = *(ThreadStart*)v;
    65	_cgo_tsan_acquire();
    66	free(v);
    67	_cgo_tsan_release();
    68
    69	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    70	return nil;
    71}
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