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  
    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  
    32  void
    33  _cgo_sys_thread_start(ThreadStart *ts)
    34  {
    35  	pthread_attr_t attr;
    36  	sigset_t ign, oset;
    37  	pthread_t p;
    38  	void *base;
    39  	size_t size;
    40  	int err;
    41  
    42  	sigfillset(&ign);
    43  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    44  
    45  	pthread_attr_init(&attr);
    46  
    47  	if (pthread_attr_getstack(&attr, &base, &size) != 0)
    48  		perror("runtime/cgo: pthread_attr_getstack failed");
    49  	if (size == 0) {
    50  		ts->g->stackhi = 2 << 20;
    51  		if (pthread_attr_setstack(&attr, NULL, ts->g->stackhi) != 0)
    52  			perror("runtime/cgo: pthread_attr_setstack failed");
    53  	} else {
    54  		ts->g->stackhi = size;
    55  	}
    56  	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    57  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    58  
    59  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    60  
    61  	if (err != 0) {
    62  		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    63  		abort();
    64  	}
    65  }
    66  
    67  static void*
    68  threadentry(void *v)
    69  {
    70  	ThreadStart ts;
    71  
    72  	ts = *(ThreadStart*)v;
    73  	free(v);
    74  
    75  	crosscall_amd64(ts.fn, setg_gcc, (void*)ts.g);
    76  	return nil;
    77  }
    78
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