Make greenbean web server better

- Remove misguided __assert_disabled variable
- Change EPROCLIM to be EAGAIN on BSD distros
- Improve quality of greenbean with cancellations
- Fix thread race condition crash with file descriptors

libc/runtime/clone.c

@@ -690,6 +690,10 @@ errno_t clone(void *func, void *stk, size_t stksz, int flags, void *arg,
     rc = ENOSYS;
   }
 
+  if (SupportsBsd() && rc == EPROCLIM) {
+    rc = EAGAIN;
+  }
+
   STRACE("clone(%t, %p, %'zu, %#x, %p, %p, %p, %p) → %s", func, stk, stksz,
          flags, arg, ptid, tls, ctid, DescribeErrno(rc));
 

libc/runtime/internal.h

@@ -35,9 +35,7 @@ int ftrace_init(void);
 void ftrace_hook(void);
 void __morph_tls(void);
 void __enable_tls(void);
-void __enable_threads(void);
 void *__cxa_finalize(void *);
-void __restore_console_win32(void);
 void __stack_chk_fail(void) wontreturn relegated;
 void __stack_chk_fail_local(void) wontreturn relegated;
 void _jmpstack(void *, void *, ...) wontreturn;

libc/runtime/runtime.h

@@ -115,6 +115,7 @@ void __paginate(int, const char *);
 void _weakfree(void *);
 void *_mapanon(size_t) attributeallocsize((1)) mallocesque;
 void *_mapshared(size_t) attributeallocsize((1)) mallocesque;
+void __enable_threads(void);
 void __oom_hook(size_t);
 bool _isheap(void *);
 /* code morphing */