Make more improvements to threading support

- fix rare thread exit race condition on openbsd
- pthread_getattr_np() now supplies detached status
- child threads may now pthread_join() the main thread
- introduce sigandset(), sigorset(), and sigisemptyset()
- introduce pthread_cleanup_push() and pthread_cleanup_pop()

libc/log/checkfail.c

@@ -16,12 +16,12 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/intrin/safemacros.internal.h"
 #include "libc/calls/calls.h"
-#include "libc/intrin/strace.internal.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
 #include "libc/intrin/kprintf.h"
+#include "libc/intrin/safemacros.internal.h"
+#include "libc/intrin/strace.internal.h"
 #include "libc/log/check.h"
 #include "libc/log/color.internal.h"
 #include "libc/log/internal.h"
@@ -71,9 +71,6 @@ relegated void __check_fail(const char *suffix, const char *opstr,
     kprintf(" %s", __argv[i]);
   }
   kprintf("%s\n", RESET);
-  if (!IsTiny() && e == ENOMEM) {
-    __print_maps();
-  }
   __die();
   unreachable;
 }

libc/log/memlog.c

@@ -26,6 +26,7 @@
 #include "libc/mem/mem.h"
 #include "libc/runtime/symbols.internal.h"
 #include "libc/sysv/consts/o.h"
+#include "libc/thread/thread.h"
 #include "third_party/dlmalloc/dlmalloc.h"
 
 /**

libc/log/oncrash.c

@@ -223,10 +223,10 @@ relegated void ShowCrashReport(int err, int sig, struct siginfo *si,
           host, getpid(), gettid(), program_invocation_name, names.sysname,
           names.version, names.nodename, names.release);
   if (ctx) {
-    kprintf("\n");
-    ShowFunctionCalls(ctx);
     ShowGeneralRegisters(ctx);
     ShowSseRegisters(ctx);
+    kprintf("\n");
+    ShowFunctionCalls(ctx);
   }
   kprintf("\n");
   __print_maps();