github.com/panjjo/go@v0.0.0-20161104043856-d62b31386338/src/runtime/cgo/gcc_linux_mips64x.c (about)

     1  // Copyright 2016 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  // +build cgo
     6  // +build linux
     7  // +build mips64 mips64le
     8  
     9  #include <pthread.h>
    10  #include <string.h>
    11  #include <signal.h>
    12  #include "libcgo.h"
    13  
    14  static void *threadentry(void*);
    15  
    16  void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    17  void (*setg_gcc)(void*);
    18  
    19  void
    20  _cgo_sys_thread_start(ThreadStart *ts)
    21  {
    22  	pthread_attr_t attr;
    23  	sigset_t ign, oset;
    24  	pthread_t p;
    25  	size_t size;
    26  	int err;
    27  
    28  	sigfillset(&ign);
    29  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    30  
    31  	// Not sure why the memset is necessary here,
    32  	// but without it, we get a bogus stack size
    33  	// out of pthread_attr_getstacksize.  C'est la Linux.
    34  	memset(&attr, 0, sizeof attr);
    35  	pthread_attr_init(&attr);
    36  	size = 0;
    37  	pthread_attr_getstacksize(&attr, &size);
    38  	// Leave stacklo=0 and set stackhi=size; mstack will do the rest.
    39  	ts->g->stackhi = size;
    40  	err = pthread_create(&p, &attr, threadentry, ts);
    41  
    42  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    43  
    44  	if (err != 0) {
    45  		fatalf("pthread_create failed: %s", strerror(err));
    46  	}
    47  }
    48  
    49  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    50  static void*
    51  threadentry(void *v)
    52  {
    53  	ThreadStart ts;
    54  
    55  	ts = *(ThreadStart*)v;
    56  	free(v);
    57  
    58  	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    59  	return nil;
    60  }
    61  
    62  void
    63  x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    64  {
    65  	pthread_attr_t attr;
    66  	size_t size;
    67  
    68  	setg_gcc = setg;
    69  	pthread_attr_init(&attr);
    70  	pthread_attr_getstacksize(&attr, &size);
    71  	g->stacklo = (uintptr)&attr - size + 4096;
    72  	pthread_attr_destroy(&attr);
    73  
    74  	if (x_cgo_inittls) {
    75  		x_cgo_inittls(tlsg, tlsbase);
    76  	}
    77  }