gcc_solaris_amd64.c

     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  
    12  static void* threadentry(void*);
    13  static void (*setg_gcc)(void*);
    14  
    15  void
    16  x_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  
    38  void
    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  
    72  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    73  static void*
    74  threadentry(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  }
    84
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