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Text file src/runtime/cgo/gcc_linux_mipsx.c

Documentation: runtime/cgo

     1	// Copyright 2016 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	// +build cgo
     6	// +build linux
     7	// +build mips mipsle
     8	
     9	#include <pthread.h>
    10	#include <string.h>
    11	#include <signal.h>
    12	#include "libcgo.h"
    13	#include "libcgo_unix.h"
    14	
    15	static void *threadentry(void*);
    16	
    17	void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    18	void (*setg_gcc)(void*);
    19	
    20	void
    21	_cgo_sys_thread_start(ThreadStart *ts)
    22	{
    23		pthread_attr_t attr;
    24		sigset_t ign, oset;
    25		pthread_t p;
    26		size_t size;
    27		int err;
    28	
    29		sigfillset(&ign);
    30		pthread_sigmask(SIG_SETMASK, &ign, &oset);
    31	
    32		// Not sure why the memset is necessary here,
    33		// but without it, we get a bogus stack size
    34		// out of pthread_attr_getstacksize.  C'est la Linux.
    35		memset(&attr, 0, sizeof attr);
    36		pthread_attr_init(&attr);
    37		size = 0;
    38		pthread_attr_getstacksize(&attr, &size);
    39		// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    40		ts->g->stackhi = size;
    41		err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    42	
    43		pthread_sigmask(SIG_SETMASK, &oset, nil);
    44	
    45		if (err != 0) {
    46			fatalf("pthread_create failed: %s", strerror(err));
    47		}
    48	}
    49	
    50	extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    51	static void*
    52	threadentry(void *v)
    53	{
    54		ThreadStart ts;
    55	
    56		ts = *(ThreadStart*)v;
    57		free(v);
    58	
    59		crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    60		return nil;
    61	}
    62	
    63	void
    64	x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    65	{
    66		pthread_attr_t attr;
    67		size_t size;
    68	
    69		setg_gcc = setg;
    70	
    71		memset(&attr, 0, sizeof attr);
    72		pthread_attr_init(&attr);
    73		pthread_attr_getstacksize(&attr, &size);
    74		g->stacklo = (uintptr)&attr - size + 4096;
    75		pthread_attr_destroy(&attr);
    76	
    77		if (x_cgo_inittls) {
    78			x_cgo_inittls(tlsg, tlsbase);
    79		}
    80	}

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