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Text file src/runtime/cgo/gcc_linux_arm.c

Documentation: runtime/cgo

     1	// Copyright 2010 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 <pthread.h>
     6	#include <string.h>
     7	#include <signal.h>
     8	#include "libcgo.h"
     9	#include "libcgo_unix.h"
    10	
    11	static void *threadentry(void*);
    12	
    13	void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    14	void (*setg_gcc)(void*);
    15	
    16	void
    17	_cgo_sys_thread_start(ThreadStart *ts)
    18	{
    19		pthread_attr_t attr;
    20		sigset_t ign, oset;
    21		pthread_t p;
    22		size_t size;
    23		int err;
    24	
    25		sigfillset(&ign);
    26		pthread_sigmask(SIG_SETMASK, &ign, &oset);
    27	
    28		// Not sure why the memset is necessary here,
    29		// but without it, we get a bogus stack size
    30		// out of pthread_attr_getstacksize. C'est la Linux.
    31		memset(&attr, 0, sizeof attr);
    32		pthread_attr_init(&attr);
    33		size = 0;
    34		pthread_attr_getstacksize(&attr, &size);
    35		// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    36		ts->g->stackhi = size;
    37		err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    38	
    39		pthread_sigmask(SIG_SETMASK, &oset, nil);
    40	
    41		if (err != 0) {
    42			fatalf("pthread_create failed: %s", strerror(err));
    43		}
    44	}
    45	
    46	extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    47	static void*
    48	threadentry(void *v)
    49	{
    50		ThreadStart ts;
    51	
    52		ts = *(ThreadStart*)v;
    53		free(v);
    54	
    55		crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
    56		return nil;
    57	}
    58	
    59	void
    60	x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    61	{
    62		pthread_attr_t attr;
    63		size_t size;
    64	
    65		setg_gcc = setg;
    66		pthread_attr_init(&attr);
    67		pthread_attr_getstacksize(&attr, &size);
    68		g->stacklo = (uintptr)&attr - size + 4096;
    69		pthread_attr_destroy(&attr);
    70	
    71		if (x_cgo_inittls) {
    72			x_cgo_inittls(tlsg, tlsbase);
    73		}
    74	}

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