[newlib-cygwin] Cygwin: Emit correct errno EAGAIN if we can't create another thread

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=994a4b7dccabb706c9dca2cd43c37e87f2cfe665

commit 994a4b7dccabb706c9dca2cd43c37e87f2cfe665
Author: Corinna Vinschen <cori...@vinschen.de>
Date:   Wed Mar 8 17:43:23 2017 +0100

    Cygwin: Emit correct errno EAGAIN if we can't create another thread
    
    Signed-off-by: Corinna Vinschen <cori...@vinschen.de>

Diff:
---
 winsup/cygwin/miscfuncs.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc
index 6dbe462..2117eb9 100644
--- a/winsup/cygwin/miscfuncs.cc
+++ b/winsup/cygwin/miscfuncs.cc
@@ -549,6 +549,8 @@ public:
     /* If we got an address, remember it for the next allocation attempt. */
     if (real_stackaddr)
       current = (UINT_PTR) real_stackaddr;
+    else
+      set_errno (EAGAIN);
     return real_stackaddr;
   }
 };