* exceptions.cc (setup_handler): Avoid suspending a thread if it in a cygwin

function, in an exception, spinning, or locked.
* gendef (_sigfe): Move incyg setting earlier.
(sigreturn): Set incyg flag to avoid interrupting called cygwin functions.
(sigdelayed): Ditto.
(stabilize_sig_stack): Ditto.
* sigproc.cc (proc_subproc): Don't restore process lock early in exec case.
* cygtls.h: Reorganize fields in _cygtls slightly.
* tlsoffsets.h: Regenerate.

winsup/cygwin/sigproc.cc

@@ -344,7 +344,6 @@ proc_subproc (DWORD what, DWORD val)
 			  pchildren[val]->pid, val, hchildren[val], pchildren[val]->hProcess);
 	  HANDLE h = hchildren[val];
 	  hchildren[val] = pchildren[val]->hProcess; /* Filled out by child */
-	  sync_proc_subproc->release ();	// Release the lock ASAP
 	  ForceCloseHandle1 (h, childhProc);
 	  ProtectHandle1 (pchildren[val]->hProcess, childhProc);
 	  rc = 0;