github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/cgo/gcc_darwin_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 <string.h> /* for strerror */
     6  #include <pthread.h>
     7  #include <signal.h>
     8  #include "libcgo.h"
     9  #include "libcgo_unix.h"
    10  
    11  static void* threadentry(void*);
    12  static void (*setg_gcc)(void*);
    13  
    14  void
    15  x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    16  {
    17  	size_t size;
    18  
    19  	setg_gcc = setg;
    20  
    21  	size = pthread_get_stacksize_np(pthread_self());
    22  	g->stacklo = (uintptr)&size - size + 4096;
    23  }
    24  
    25  
    26  void
    27  _cgo_sys_thread_start(ThreadStart *ts)
    28  {
    29  	pthread_attr_t attr;
    30  	sigset_t ign, oset;
    31  	pthread_t p;
    32  	size_t size;
    33  	int err;
    34  
    35  	sigfillset(&ign);
    36  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    37  
    38  	size = pthread_get_stacksize_np(pthread_self());
    39  	pthread_attr_init(&attr);
    40  	pthread_attr_setstacksize(&attr, size);
    41  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    42  	ts->g->stackhi = size;
    43  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    44  
    45  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    46  
    47  	if (err != 0) {
    48  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    49  		abort();
    50  	}
    51  }
    52  
    53  static void*
    54  threadentry(void *v)
    55  {
    56  	ThreadStart ts;
    57  
    58  	ts = *(ThreadStart*)v;
    59  	free(v);
    60  
    61  	crosscall_amd64(ts.fn, setg_gcc, (void*)ts.g);
    62  	return nil;
    63  }