github.com/razvanm/vanadium-go-1.3@v0.0.0-20160721203343-4a65068e5915/src/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 <signal.h>
     8  #include "libcgo.h"
     9  
    10  static void *threadentry(void*);
    11  
    12  void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    13  void (*setg_gcc)(void*);
    14  
    15  void
    16  _cgo_sys_thread_start(ThreadStart *ts)
    17  {
    18  	pthread_attr_t attr;
    19  	sigset_t ign, oset;
    20  	pthread_t p;
    21  	size_t size;
    22  	int err;
    23  
    24  	sigfillset(&ign);
    25  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    26  
    27  	// Not sure why the memset is necessary here,
    28  	// but without it, we get a bogus stack size
    29  	// out of pthread_attr_getstacksize.  C'est la Linux.
    30  	memset(&attr, 0, sizeof attr);
    31  	pthread_attr_init(&attr);
    32  	size = 0;
    33  	pthread_attr_getstacksize(&attr, &size);
    34  	// Leave stacklo=0 and set stackhi=size; mstack will do the rest.
    35  	ts->g->stackhi = size;
    36  	err = pthread_create(&p, &attr, threadentry, ts);
    37  
    38  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    39  
    40  	if (err != 0) {
    41  		fatalf("pthread_create failed: %s", strerror(err));
    42  	}
    43  }
    44  
    45  extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    46  static void*
    47  threadentry(void *v)
    48  {
    49  	ThreadStart ts;
    50  
    51  	ts = *(ThreadStart*)v;
    52  	free(v);
    53  
    54  	crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
    55  	return nil;
    56  }
    57  
    58  void
    59  x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    60  {
    61  	pthread_attr_t attr;
    62  	size_t size;
    63  
    64  	setg_gcc = setg;
    65  	pthread_attr_init(&attr);
    66  	pthread_attr_getstacksize(&attr, &size);
    67  	g->stacklo = (uintptr)&attr - size + 4096;
    68  	pthread_attr_destroy(&attr);
    69  
    70  	if (x_cgo_inittls) {
    71  		x_cgo_inittls(tlsg, tlsbase);
    72  	}
    73  }