Make some improvements of little consequence

libc/thread/pthread_attr_init.c

@@ -34,6 +34,8 @@
  * @see pthread_attr_setschedpolicy()
  * @see pthread_attr_setinheritsched()
  * @see pthread_attr_setscope()
+ * @see pthread_attr_setsigaltstack_np()
+ * @see pthread_attr_setsigaltstacksize_np()
  */
 errno_t pthread_attr_init(pthread_attr_t *attr) {
   *attr = (pthread_attr_t){

libc/thread/pthread_cancel.c

@@ -354,6 +354,7 @@ static errno_t _pthread_cancel_everyone(void) {
  */
 errno_t pthread_cancel(pthread_t thread) {
   struct PosixThread *arg;
+  unassert(thread);
   if ((arg = (struct PosixThread *)thread)) {
     return _pthread_cancel_single(arg);
   } else {

libc/thread/pthread_detach.c

@@ -62,6 +62,7 @@ static errno_t pthread_detach_impl(struct PosixThread *pt) {
  * @returnserrno
  */
 errno_t pthread_detach(pthread_t thread) {
+  unassert(thread);
   struct PosixThread *pt = (struct PosixThread *)thread;
   errno_t err = pthread_detach_impl(pt);
   STRACE("pthread_detach(%d) → %s", _pthread_tid(pt), DescribeErrno(err));

libc/thread/pthread_getaffinity_np.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/calls/sched-sysv.internal.h"
 #include "libc/calls/struct/cpuset.h"
 #include "libc/dce.h"
@@ -39,6 +40,8 @@
 errno_t pthread_getaffinity_np(pthread_t thread, size_t size,
                                cpu_set_t *bitset) {
   int rc, tid;
+  unassert(thread);
+  unassert(bitset);
   tid = _pthread_tid((struct PosixThread *)thread);
 
   if (size != sizeof(cpu_set_t)) {

libc/thread/pthread_setaffinity_np.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/calls/sched-sysv.internal.h"
 #include "libc/calls/struct/cpuset.h"
 #include "libc/calls/syscall_support-nt.internal.h"
@@ -54,6 +55,8 @@ errno_t pthread_setaffinity_np(pthread_t thread, size_t size,
   int e, rc, tid;
   cpu_set_t bs = {0};
   struct PosixThread *pt;
+  unassert(thread);
+  unassert(bitset);
   e = errno;
   if (size < sizeof(cpu_set_t)) {
     memcpy(&bs, bitset, size);

libc/thread/pthread_timedjoin_np.c

@@ -118,6 +118,7 @@ errno_t pthread_timedjoin_np(pthread_t thread, void **value_ptr,
   struct PosixThread *pt;
   enum PosixThreadStatus status;
   pt = (struct PosixThread *)thread;
+  unassert(thread);
 
   // "The behavior is undefined if the value specified by the thread
   //  argument to pthread_join() does not refer to a joinable thread."