115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
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/* go-libmain.c -- the startup function for a Go library.
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Copyright 2015 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "config.h"
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include "runtime.h"
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#include "go-alloc.h"
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#include "array.h"
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#include "arch.h"
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#include "malloc.h"
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/* This is used when building a standalone Go library using the Go
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command's -buildmode=c-archive or -buildmode=c-shared option. It
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starts up the Go code as a global constructor but does not take any
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other action. The main program is written in some other language
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and calls exported Go functions as needed. */
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static void die (const char *, int);
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static void initfn (int, char **, char **);
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static void *gostart (void *);
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/* Used to pass arguments to the thread that runs the Go startup. */
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struct args {
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int argc;
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char **argv;
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};
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/* We use .init_array so that we can get the command line arguments.
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This obviously assumes .init_array support; different systems may
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require other approaches. */
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typedef void (*initarrayfn) (int, char **, char **);
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static initarrayfn initarray[1]
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__attribute__ ((section (".init_array"), used)) =
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{ initfn };
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/* This function is called at program startup time. It starts a new
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thread to do the actual Go startup, so that program startup is not
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paused waiting for the Go initialization functions. Exported cgo
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functions will wait for initialization to complete if
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necessary. */
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static void
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initfn (int argc, char **argv, char** env __attribute__ ((unused)))
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{
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int err;
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pthread_attr_t attr;
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struct args *a;
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pthread_t tid;
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a = (struct args *) malloc (sizeof *a);
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if (a == NULL)
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die ("malloc", errno);
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a->argc = argc;
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a->argv = argv;
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err = pthread_attr_init (&attr);
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if (err != 0)
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die ("pthread_attr_init", err);
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err = pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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if (err != 0)
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die ("pthread_attr_setdetachstate", err);
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err = pthread_create (&tid, &attr, gostart, (void *) a);
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if (err != 0)
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die ("pthread_create", err);
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err = pthread_attr_destroy (&attr);
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if (err != 0)
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die ("pthread_attr_destroy", err);
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}
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/* Start up the Go runtime. */
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static void *
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gostart (void *arg)
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{
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struct args *a = (struct args *) arg;
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runtime_isarchive = true;
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if (runtime_isstarted)
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return NULL;
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runtime_isstarted = true;
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runtime_check ();
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runtime_args (a->argc, (byte **) a->argv);
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runtime_osinit ();
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runtime_schedinit ();
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__go_go (runtime_main, NULL);
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runtime_mstart (runtime_m ());
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abort ();
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}
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/* If something goes wrong during program startup, crash. There is no
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way to report failure and nobody to whom to report it. */
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static void
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die (const char *fn, int err)
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{
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fprintf (stderr, "%s: %d\n", fn, err);
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exit (EXIT_FAILURE);
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}
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