gcc_solaris_amd64.c

Documentation: runtime/cgo

     1// Copyright 2015 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 <ucontext.h>
     9#include "libcgo.h"
    10#include "libcgo_unix.h"
    11
    12static void* threadentry(void*);
    13static void (*setg_gcc)(void*);
    14
    15void
    16x_cgo_init(G *g, void (*setg)(void*))
    17{
    18	ucontext_t ctx;
    19
    20	setg_gcc = setg;
    21	if (getcontext(&ctx) != 0)
    22		perror("runtime/cgo: getcontext failed");
    23	g->stacklo = (uintptr_t)ctx.uc_stack.ss_sp;
    24
    25	// Solaris processes report a tiny stack when run with "ulimit -s unlimited".
    26	// Correct that as best we can: assume it's at least 1 MB.
    27	// See golang.org/issue/12210.
    28	if(ctx.uc_stack.ss_size < 1024*1024)
    29		g->stacklo -= 1024*1024 - ctx.uc_stack.ss_size;
    30
    31	// Sanity check the results now, rather than getting a
    32	// morestack on g0 crash.
    33	if (g->stacklo >= g->stackhi) {
    34		fatalf("bad stack bounds: lo=%p hi=%p", (void*)(g->stacklo), (void*)(g->stackhi));
    35	}
    36}
    37
    38void
    39_cgo_sys_thread_start(ThreadStart *ts)
    40{
    41	pthread_attr_t attr;
    42	sigset_t ign, oset;
    43	pthread_t p;
    44	void *base;
    45	size_t size;
    46	int err;
    47
    48	sigfillset(&ign);
    49	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    50
    51	pthread_attr_init(&attr);
    52
    53	if (pthread_attr_getstack(&attr, &base, &size) != 0)
    54		perror("runtime/cgo: pthread_attr_getstack failed");
    55	if (size == 0) {
    56		ts->g->stackhi = 2 << 20;
    57		if (pthread_attr_setstack(&attr, NULL, ts->g->stackhi) != 0)
    58			perror("runtime/cgo: pthread_attr_setstack failed");
    59	} else {
    60		ts->g->stackhi = size;
    61	}
    62	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    63	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    64
    65	pthread_sigmask(SIG_SETMASK, &oset, nil);
    66
    67	if (err != 0) {
    68		fatalf("pthread_create failed: %s", strerror(err));
    69	}
    70}
    71
    72extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    73static void*
    74threadentry(void *v)
    75{
    76	ThreadStart ts;
    77
    78	ts = *(ThreadStart*)v;
    79	free(v);
    80
    81	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    82	return nil;
    83}
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