gcc_freebsd_amd64.c

Documentation: runtime/cgo

     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 <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  	// Deal with memory sanitizer/clang interaction.
    24  	// See gcc_linux_amd64.c for details.
    25  	setg_gcc = setg;
    26  	attr = (pthread_attr_t*)malloc(sizeof *attr);
    27  	if (attr == NULL) {
    28  		fatalf("malloc failed: %s", strerror(errno));
    29  	}
    30  	pthread_attr_init(attr);
    31  	pthread_attr_getstacksize(attr, &size);
    32  	g->stacklo = (uintptr)&attr - size + 4096;
    33  	pthread_attr_destroy(attr);
    34  	free(attr);
    35  }
    36  
    37  void
    38  _cgo_sys_thread_start(ThreadStart *ts)
    39  {
    40  	pthread_attr_t attr;
    41  	sigset_t ign, oset;
    42  	pthread_t p;
    43  	size_t size;
    44  	int err;
    45  
    46  	SIGFILLSET(ign);
    47  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    48  
    49  	pthread_attr_init(&attr);
    50  	pthread_attr_getstacksize(&attr, &size);
    51  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    52  	ts->g->stackhi = size;
    53  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    54  
    55  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    56  
    57  	if (err != 0) {
    58  		fatalf("pthread_create failed: %s", strerror(err));
    59  	}
    60  }
    61  
    62  static void*
    63  threadentry(void *v)
    64  {
    65  	ThreadStart ts;
    66  
    67  	ts = *(ThreadStart*)v;
    68  	_cgo_tsan_acquire();
    69  	free(v);
    70  	_cgo_tsan_release();
    71  
    72  	crosscall_amd64(ts.fn, setg_gcc, (void*)ts.g);
    73  	return nil;
    74  }
    75
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