gcc_openbsd_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 <pthread.h>
     7  #include <signal.h>
     8  #include <string.h>
     9  #include "libcgo.h"
    10  #include "libcgo_unix.h"
    11  
    12  static void* threadentry(void*);
    13  static void (*setg_gcc)(void*);
    14  
    15  void
    16  x_cgo_init(G *g, void (*setg)(void*))
    17  {
    18  	pthread_attr_t attr;
    19  	size_t size;
    20  
    21  	setg_gcc = setg;
    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  void
    29  _cgo_sys_thread_start(ThreadStart *ts)
    30  {
    31  	pthread_attr_t attr;
    32  	sigset_t ign, oset;
    33  	pthread_t p;
    34  	size_t size;
    35  	int err;
    36  
    37  	sigfillset(&ign);
    38  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    39  
    40  	pthread_attr_init(&attr);
    41  	pthread_attr_getstacksize(&attr, &size);
    42  
    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  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    56  
    57  static void*
    58  threadentry(void *v)
    59  {
    60  	ThreadStart ts;
    61  
    62  	ts = *(ThreadStart*)v;
    63  	free(v);
    64  
    65  	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    66  	return nil;
    67  }
    68
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