mirror of https://go.googlesource.com/go
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
#include <pthread.h>
|
|
#include <errno.h>
|
|
#include <string.h> // strerror
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include "libcgo.h"
|
|
#include "libcgo_unix.h"
|
|
|
|
static void* threadentry(void*);
|
|
static void (*setg_gcc)(void*);
|
|
|
|
// This will be set in gcc_android.c for android-specific customization.
|
|
void (*x_cgo_inittls)(void **tlsg, void **tlsbase) __attribute__((common));
|
|
|
|
void
|
|
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
|
|
{
|
|
uintptr *pbounds;
|
|
|
|
/* The memory sanitizer distributed with versions of clang
|
|
before 3.8 has a bug: if you call mmap before malloc, mmap
|
|
may return an address that is later overwritten by the msan
|
|
library. Avoid this problem by forcing a call to malloc
|
|
here, before we ever call malloc.
|
|
|
|
This is only required for the memory sanitizer, so it's
|
|
unfortunate that we always run it. It should be possible
|
|
to remove this when we no longer care about versions of
|
|
clang before 3.8. The test for this is
|
|
misc/cgo/testsanitizers.
|
|
|
|
GCC works hard to eliminate a seemingly unnecessary call to
|
|
malloc, so we actually use the memory we allocate. */
|
|
|
|
setg_gcc = setg;
|
|
pbounds = (uintptr*)malloc(2 * sizeof(uintptr));
|
|
if (pbounds == NULL) {
|
|
fatalf("malloc failed: %s", strerror(errno));
|
|
}
|
|
_cgo_set_stacklo(g, pbounds);
|
|
free(pbounds);
|
|
|
|
if (x_cgo_inittls) {
|
|
x_cgo_inittls(tlsg, tlsbase);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
_cgo_sys_thread_start(ThreadStart *ts)
|
|
{
|
|
pthread_attr_t attr;
|
|
sigset_t ign, oset;
|
|
pthread_t p;
|
|
size_t size;
|
|
int err;
|
|
|
|
sigfillset(&ign);
|
|
pthread_sigmask(SIG_SETMASK, &ign, &oset);
|
|
|
|
pthread_attr_init(&attr);
|
|
pthread_attr_getstacksize(&attr, &size);
|
|
// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
|
|
ts->g->stackhi = size;
|
|
err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
|
|
|
|
pthread_sigmask(SIG_SETMASK, &oset, nil);
|
|
|
|
if (err != 0) {
|
|
fatalf("pthread_create failed: %s", strerror(err));
|
|
}
|
|
}
|
|
|
|
extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
|
|
static void*
|
|
threadentry(void *v)
|
|
{
|
|
ThreadStart ts;
|
|
|
|
ts = *(ThreadStart*)v;
|
|
_cgo_tsan_acquire();
|
|
free(v);
|
|
_cgo_tsan_release();
|
|
|
|
crosscall1(ts.fn, setg_gcc, (void*)ts.g);
|
|
return nil;
|
|
}
|