void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
pthread_attr_t attr;
size_t size;
setg_gcc = setg;
pthread_attr_init(&attr);
pthread_attr_getstacksize(&attr, &size);
g->stacklo = (uintptr)&attr - size + 4096;
pthread_attr_destroy(&attr);
if (x_cgo_inittls) {
x_cgo_inittls(tlsg, tlsbase);
}
}
void
x_cgo_init(G* g, void (*setg)(void*))
{
pthread_attr_t *attr;
size_t size;
/* 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;
attr = (pthread_attr_t*)malloc(sizeof *attr);
if (attr == NULL) {
fatalf("malloc failed: %s", strerror(errno));
}
pthread_attr_init(attr);
pthread_attr_getstacksize(attr, &size);
g->stacklo = (uintptr)&size - size + 4096;
pthread_attr_destroy(attr);
free(attr);
if (x_cgo_inittls) {
x_cgo_inittls();
}
}
