implement pthread_getattr_np
this function is mainly (purely?) for obtaining stack address
information, but we also provide the detach state since it's easy to
do anyway.
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 059c20e..6163f50 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -101,7 +101,7 @@
int ret;
size_t size, guard;
struct pthread *self = pthread_self(), *new;
- unsigned char *map = 0, *stack = 0, *tsd = 0;
+ unsigned char *map = 0, *stack = 0, *tsd = 0, *stack_limit;
unsigned flags = 0x7d8f00;
int do_sched = 0;
pthread_attr_t attr = {0};
@@ -123,6 +123,7 @@
size_t need = libc.tls_size + __pthread_tsd_size;
size = attr._a_stacksize + DEFAULT_STACK_SIZE;
stack = (void *)(attr._a_stackaddr & -16);
+ stack_limit = attr._a_stackaddr - size;
/* Use application-provided stack for TLS only when
* it does not take more than ~12% or 2k of the
* application's stack space. */
@@ -152,12 +153,17 @@
if (map == MAP_FAILED) goto fail;
}
tsd = map + size - __pthread_tsd_size;
- if (!stack) stack = tsd - libc.tls_size;
+ if (!stack) {
+ stack = tsd - libc.tls_size;
+ stack_limit = map + guard;
+ }
}
new = __copy_tls(tsd - libc.tls_size);
new->map_base = map;
new->map_size = size;
+ new->stack = stack;
+ new->stack_size = stack - stack_limit;
new->pid = self->pid;
new->errno_ptr = &new->errno_val;
new->start = entry;