github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/src/pkg/runtime/cgo/gcc_linux_arm.c (about)

     1  // Copyright 2010 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 "libcgo.h"
     8  
     9  static void *threadentry(void*);
    10  
    11  static void (*setmg_gcc)(void*, void*);
    12  
    13  void
    14  x_cgo_init(G *g, void (*setmg)(void*, void*))
    15  {
    16  	pthread_attr_t attr;
    17  	size_t size;
    18  
    19  	setmg_gcc = setmg;
    20  	pthread_attr_init(&attr);
    21  	pthread_attr_getstacksize(&attr, &size);
    22  	g->stackguard = (uintptr)&attr - size + 4096;
    23  	pthread_attr_destroy(&attr);
    24  }
    25  
    26  
    27  void
    28  _cgo_sys_thread_start(ThreadStart *ts)
    29  {
    30  	pthread_attr_t attr;
    31  	pthread_t p;
    32  	size_t size;
    33  	int err;
    34  
    35  	// Not sure why the memset is necessary here,
    36  	// but without it, we get a bogus stack size
    37  	// out of pthread_attr_getstacksize.  C'est la Linux.
    38  	memset(&attr, 0, sizeof attr);
    39  	pthread_attr_init(&attr);
    40  	size = 0;
    41  	pthread_attr_getstacksize(&attr, &size);
    42  	ts->g->stackguard = size;
    43  	err = pthread_create(&p, &attr, threadentry, ts);
    44  	if (err != 0) {
    45  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    46  		abort();
    47  	}
    48  }
    49  
    50  extern void crosscall_arm2(void (*fn)(void), void (*setmg_gcc)(void*, void*), void*, void*);
    51  static void*
    52  threadentry(void *v)
    53  {
    54  	ThreadStart ts;
    55  
    56  	ts = *(ThreadStart*)v;
    57  	free(v);
    58  
    59  	ts.g->stackbase = (uintptr)&ts;
    60  
    61  	/*
    62  	 * _cgo_sys_thread_start set stackguard to stack size;
    63  	 * change to actual guard pointer.
    64  	 */
    65  	ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096 * 2;
    66  
    67  	crosscall_arm2(ts.fn, setmg_gcc, (void*)ts.m, (void*)ts.g);
    68  	return nil;
    69  }