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Text file src/runtime/cgo/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		/*
    73		 * Set specific keys.
    74		 */
    75		setg_gcc((void*)ts.g);
    76	
    77		crosscall_amd64(ts.fn);
    78		return nil;
    79	}

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