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Text file src/runtime/cgo/gcc_linux_386.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 <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	static void (*setg_gcc)(void*);
    13	
    14	// These will be set in gcc_android_386.c for android-specific customization.
    15	void (*x_cgo_inittls)(void);
    16	void* (*x_cgo_threadentry)(void*);
    17	
    18	void
    19	x_cgo_init(G *g, void (*setg)(void*))
    20	{
    21		pthread_attr_t attr;
    22		size_t size;
    23	
    24		setg_gcc = setg;
    25		pthread_attr_init(&attr);
    26		pthread_attr_getstacksize(&attr, &size);
    27		g->stacklo = (uintptr)&attr - size + 4096;
    28		pthread_attr_destroy(&attr);
    29	
    30		if (x_cgo_inittls) {
    31			x_cgo_inittls();
    32		}
    33	}
    34	
    35	
    36	void
    37	_cgo_sys_thread_start(ThreadStart *ts)
    38	{
    39		pthread_attr_t attr;
    40		sigset_t ign, oset;
    41		pthread_t p;
    42		size_t size;
    43		int err;
    44	
    45		sigfillset(&ign);
    46		pthread_sigmask(SIG_SETMASK, &ign, &oset);
    47	
    48		// Not sure why the memset is necessary here,
    49		// but without it, we get a bogus stack size
    50		// out of pthread_attr_getstacksize. C'est la Linux.
    51		memset(&attr, 0, sizeof attr);
    52		pthread_attr_init(&attr);
    53		size = 0;
    54		pthread_attr_getstacksize(&attr, &size);
    55		// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    56		ts->g->stackhi = size;
    57		err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    58	
    59		pthread_sigmask(SIG_SETMASK, &oset, nil);
    60	
    61		if (err != 0) {
    62			fatalf("pthread_create failed: %s", strerror(err));
    63		}
    64	}
    65	
    66	static void*
    67	threadentry(void *v)
    68	{
    69		if (x_cgo_threadentry) {
    70			return x_cgo_threadentry(v);
    71		}
    72	
    73		ThreadStart ts;
    74	
    75		ts = *(ThreadStart*)v;
    76		free(v);
    77	
    78		/*
    79		 * Set specific keys.
    80		 */
    81		setg_gcc((void*)ts.g);
    82	
    83		crosscall_386(ts.fn);
    84		return nil;
    85	}

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