gcc_freebsd_arm64.c

Documentation: runtime/cgo

     1  // Copyright 2019 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 <sys/types.h>
     6  #include <errno.h>
     7  #include <sys/signalvar.h>
     8  #include <pthread.h>
     9  #include <signal.h>
    10  #include <string.h>
    11  #include "libcgo.h"
    12  #include "libcgo_unix.h"
    13  
    14  static void* threadentry(void*);
    15  static void (*setg_gcc)(void*);
    16  
    17  void
    18  x_cgo_init(G *g, void (*setg)(void*))
    19  {
    20  	pthread_attr_t attr;
    21  	size_t size;
    22  
    23  	setg_gcc = setg;
    24  	pthread_attr_init(&attr);
    25  	pthread_attr_getstacksize(&attr, &size);
    26  	g->stacklo = (uintptr)&attr - size + 4096;
    27  	pthread_attr_destroy(&attr);
    28  }
    29  
    30  void
    31  _cgo_sys_thread_start(ThreadStart *ts)
    32  {
    33  	pthread_attr_t attr;
    34  	sigset_t ign, oset;
    35  	pthread_t p;
    36  	size_t size;
    37  	int err;
    38  
    39  	SIGFILLSET(ign);
    40  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    41  
    42  	pthread_attr_init(&attr);
    43  	pthread_attr_getstacksize(&attr, &size);
    44  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    45  	ts->g->stackhi = size;
    46  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    47  
    48  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    49  
    50  	if (err != 0) {
    51  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    52  		abort();
    53  	}
    54  }
    55  
    56  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(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  	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    67  	return nil;
    68  }
    69
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