github.com/tidwall/go@v0.0.0-20170415222209-6694a6888b7d/src/runtime/cgo/gcc_linux_ppc64x.c (about)

     1  // Copyright 2014 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 ppc64 ppc64le
     6  
     7  #include <pthread.h>
     8  #include <string.h>
     9  #include <signal.h>
    10  #include "libcgo.h"
    11  #include "libcgo_unix.h"
    12  
    13  static void *threadentry(void*);
    14  
    15  void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    16  static void (*setg_gcc)(void*);
    17  
    18  void
    19  x_cgo_init(G *g, void (*setg)(void*), void **tlsbase)
    20  {
    21  	pthread_attr_t attr;
    22  	size_t size;
    23  
    24  	setg_gcc = setg;
    25  	pthread_attr_init(&attr);
    26  	pthread_attr_getstacksize(&attr, &size);
    27  	g->stacklo = (uintptr)&attr - size + 4096;
    28  	pthread_attr_destroy(&attr);
    29  }
    30  
    31  void
    32  _cgo_sys_thread_start(ThreadStart *ts)
    33  {
    34  	pthread_attr_t attr;
    35  	sigset_t ign, oset;
    36  	pthread_t p;
    37  	size_t size;
    38  	int err;
    39  
    40  	sigfillset(&ign);
    41  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    42  
    43  	pthread_attr_init(&attr);
    44  	pthread_attr_getstacksize(&attr, &size);
    45  	// Leave stacklo=0 and set stackhi=size; mstack will do the rest.
    46  	ts->g->stackhi = size;
    47  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    48  
    49  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    50  
    51  	if (err != 0) {
    52  		fatalf("pthread_create failed: %s", strerror(err));
    53  	}
    54  }
    55  
    56  extern void crosscall_ppc64(void (*fn)(void), void *g);
    57  
    58  static void*
    59  threadentry(void *v)
    60  {
    61  	ThreadStart ts;
    62  
    63  	ts = *(ThreadStart*)v;
    64  	free(v);
    65  
    66  	// Save g for this thread in C TLS
    67  	setg_gcc((void*)ts.g);
    68  
    69  	crosscall_ppc64(ts.fn, (void*)ts.g);
    70  	return nil;
    71  }