github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/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  	pthread_attr_t attr;
    18  	size_t size;
    19  
    20  	setg_gcc = setg;
    21  
    22  	pthread_attr_init(&attr);
    23  	pthread_attr_getstacksize(&attr, &size);
    24  	g->stacklo = (uintptr)&attr - size + 4096;
    25  	pthread_attr_destroy(&attr);
    26  }
    27  
    28  
    29  void
    30  _cgo_sys_thread_start(ThreadStart *ts)
    31  {
    32  	pthread_attr_t attr;
    33  	sigset_t ign, oset;
    34  	pthread_t p;
    35  	size_t size;
    36  	int err;
    37  
    38  	sigfillset(&ign);
    39  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    40  
    41  	pthread_attr_init(&attr);
    42  	pthread_attr_getstacksize(&attr, &size);
    43  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    44  	ts->g->stackhi = size;
    45  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    46  
    47  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    48  
    49  	if (err != 0) {
    50  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    51  		abort();
    52  	}
    53  }
    54  
    55  static void*
    56  threadentry(void *v)
    57  {
    58  	ThreadStart ts;
    59  
    60  	ts = *(ThreadStart*)v;
    61  	free(v);
    62  
    63  	crosscall_amd64(ts.fn, setg_gcc, (void*)ts.g);
    64  	return nil;
    65  }