github.com/akaros/go-akaros@v0.0.0-20181004170632-85005d477eab/src/runtime/cgo/gcc_akaros_amd64.c (about)

     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 <pthread.h>
     6  #include <string.h> // strerror
     7  #include <signal.h>
     8  #include "libcgo.h"
     9  
    10  static void* threadentry(void*);
    11  static void (*setg_gcc)(void*);
    12  
    13  void
    14  x_cgo_init(G* g, void (*setg)(void*))
    15  {
    16  	int dummy;
    17  	// The system stack is set to a fixed size of 256 pages
    18  	g->stacklo = (uintptr)&dummy - 256*4096 + 4096;
    19  	setg_gcc = setg;
    20  }
    21  
    22  
    23  void
    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; mstack will do the rest.
    38  	ts->g->stackhi = size;
    39  	err = pthread_create(&p, &attr, threadentry, ts);
    40  
    41  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    42  
    43  	if (err != 0) {
    44  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    45  		abort();
    46  	}
    47  }
    48  
    49  static void*
    50  threadentry(void *v)
    51  {
    52  	ThreadStart ts;
    53  
    54  	ts = *(ThreadStart*)v;
    55  	free(v);
    56  
    57  	/*
    58  	 * Set specific keys.
    59  	 */
    60  	setg_gcc((void*)ts.g);
    61  
    62  	crosscall_amd64(ts.fn);
    63  	return nil;
    64  }