gcc_freebsd_amd64.c

     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  	uintptr *pbounds;
    21  
    22  	// Deal with memory sanitizer/clang interaction.
    23  	// See gcc_linux_amd64.c for details.
    24  	setg_gcc = setg;
    25  	pbounds = (uintptr*)malloc(2 * sizeof(uintptr));
    26  	if (pbounds == NULL) {
    27  		fatalf("malloc failed: %s", strerror(errno));
    28  	}
    29  	_cgo_set_stacklo(g, pbounds);
    30  	free(pbounds);
    31  }
    32  
    33  void
    34  _cgo_sys_thread_start(ThreadStart *ts)
    35  {
    36  	pthread_attr_t attr;
    37  	sigset_t ign, oset;
    38  	pthread_t p;
    39  	size_t size;
    40  	int err;
    41  
    42  	SIGFILLSET(ign);
    43  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    44  
    45  	pthread_attr_init(&attr);
    46  	pthread_attr_getstacksize(&attr, &size);
    47  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    48  	ts->g->stackhi = size;
    49  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    50  
    51  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    52  
    53  	if (err != 0) {
    54  		fatalf("pthread_create failed: %s", strerror(err));
    55  	}
    56  }
    57  
    58  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    59  static void*
    60  threadentry(void *v)
    61  {
    62  	ThreadStart ts;
    63  
    64  	ts = *(ThreadStart*)v;
    65  	_cgo_tsan_acquire();
    66  	free(v);
    67  	_cgo_tsan_release();
    68  
    69  	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    70  	return nil;
    71  }
    72
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