Eliminate use of sigframe and sigthread throughout.

* Makefile.in (DLL_OFILES): Add sigfe.o.  Remove reliance on cygwin.def from
cygwin0.dll dependency since dependence on sigfe.o implies that.  Generate def
file on the fly using 'gendef'.
* configure.in: Don't auto-generate cygwin.def.
* configure: Regenerate.
* cygwin.din: Add SIGFE stuff where appropriate.
* dcrt0.cc (dll_crt0_1): Initialize cygwin tls early in process startup.  Set
_main_tls to address of the main thread's cygwin tls.
* debug.h: Remove now unneeded WFSO and WFMO declarations.
* exceptions.cc (_last_thread): Define.
(set_thread_state_for_signals): New function.
(reset_thread_exception_for_signals): Ditto.
(init_thread_for_signals): Ditto.
(delete_thread_for_signals): Ditto.
(capture_thread_for_signals): Ditto.
(handle_exceptions): Set return address explicitly for exceptions prior to
calling sig_send.
(interrupt_on_return): Eliminate.
(setup_handler): Add preliminary implementation for dealing with
thread-specific signals by querying _main_tls.
(signal_exit): Use cygthread::main_thread_id instead of mainthread.id.
(call_signal_handler_now): For now, just handle the main thread.
* fork.cc (vfork): Save and restore main _my_tls.
* gendef: New file.  Generates def file and sigfe.s file.
* gentls_offsets: New file.  Generates offsets for perl to use in sigfe.s.
* how-signals-work.txt: Mention that info is obsolete.
* init.cc (dll_entry): Initialize cygwin tls storage here.
* miscfuncs.cc (low_priority_sleep): Make a C function for easier calling from
asm.
* perthread.h (vfork_save::tls): New element.
* signal.cc (nanosleep): Replace previous use of
sigframe.call_signal_handler_now with straight call to call_signal_handler_now.
(abort): Ditto.
* syscalls.cc (readv): Ditto.
* termios.cc (tcsetattr): Ditto.
* wait.cc (wait4): Ditto.
* sigproc.cc (sig_dispatch_pending): Ditto.
(sig_send): Ditto.
* sigproc.h: Declare call_signal_handler_now.
* thread.cc (pthread::thread_init_wrapper): Initialize cygwin tls.  Remove
obsolete and unworking signal stuff.
* thread.h (verifyable_object::sigs): Eliminate.
(verifyable_object::sigmask): Eliminate.
(verifyable_object::sigtodo): Eliminate.
(verifyable_object::exit): Make attribute noreturn.
(verifyable_object::thread_init_wrapper): Ditto.
(pthread_null::exit): Ditto.
* winbase.h (__stackbase): Always define.
* winsup.h (low_priority_sleep): Declare as a "C" function.
* include/cygwin/version.h: Bump API version to reflect sigwait export.
* include/sys/queue.h: Protect SLIST_ENTRY from previous declaration.
* signal.cc (sigwait): Implement.
* select.cc (fhandler_base::ready_for_read): Add debugging output.
* devices.h: Define more device pointers via their storage.
* devices.in: Don't parse things like /dev/inet/tcp, as they really have no
meaning.
* devices.cc: Regenerate.
* gendevices: Set proper protection for output file.
* cygtls.h: New file.
* gendef: New file.
* gentls_offsets: New file.
* tlsoffsets.h: New file.  Autogenerated.
* config/i386/longjmp.c: Remove.  File subsumed by gendef output.
* config/i386/makefrag: Remove obsolete file.
* fhandler.cc: Remove spurious access_worker declaration.
* spawn.cc (spawnve): Make debugging output more accurate.
* cygwin-gperf: Remove.
* devices.cc: Remove.

winsup/cygwin/dcrt0.cc

@@ -42,15 +42,11 @@ details. */
 HANDLE NO_COPY hMainProc = (HANDLE) -1;
 HANDLE NO_COPY hMainThread;
 
-sigthread NO_COPY mainthread;		// ID of the main thread
-
 per_thread_waitq NO_COPY waitq_storage;
 per_thread_vfork NO_COPY vfork_storage;
-per_thread_signal_dispatch NO_COPY signal_dispatch_storage;
 
 per_thread NO_COPY *threadstuff[] = {&waitq_storage,
 				     &vfork_storage,
-				     &signal_dispatch_storage,
 				     NULL};
 
 bool display_title;
@@ -72,7 +68,6 @@ ResourceLocks _reslock NO_COPY;
 MTinterface _mtinterf;
 
 bool NO_COPY _cygwin_testing;
-unsigned NO_COPY _cygwin_testing_magic;
 
 char NO_COPY almost_null[1];
 
@@ -526,15 +521,10 @@ int _declspec(dllexport) __argc;
 char _declspec(dllexport) **__argv;
 vfork_save NO_COPY *main_vfork = NULL;
 
-void
-sigthread::init (const char *s)
-{
-  InitializeCriticalSection (&lock);
-  id = GetCurrentThreadId ();
-}
-
 extern "C" void __sinit (_reent *);
 
+_threadinfo NO_COPY *_main_tls;
+
 /* Take over from libc's crt0.o and start the application. Note the
    various special cases when Cygwin DLL is being runtime loaded (as
    opposed to being link-time loaded by Cygwin apps) from a non
@@ -542,6 +532,9 @@ extern "C" void __sinit (_reent *);
 static void
 dll_crt0_1 ()
 {
+  __uint64_t padding[CYGTLS_PADSIZE];
+  _main_tls = _my_tls.init (padding);
+
   /* According to onno@stack.urc.tue.nl, the exception handler record must
      be on the stack.  */
   /* FIXME: Verify forked children get their exception handler set up ok. */
@@ -568,9 +561,6 @@ dll_crt0_1 ()
   user_data->resourcelocks->Init ();
   user_data->threadinterface->Init ();
 
-  mainthread.init ("mainthread"); // For use in determining if signals
-				  //  should be blocked.
-
   winpids::init ();
 
   int envc = 0;
@@ -632,7 +622,7 @@ dll_crt0_1 ()
   ProtectHandle (hMainThread);
   cygthread::init ();
 
-  /* Initialize pthread mainthread when not forked and it is save to call new,
+  /* Initialize pthread mainthread when not forked and it is safe to call new,
      otherwise it is reinitalized in fixup_after_fork */
   if (!user_data->forkee)
     {
@@ -804,9 +794,9 @@ break_here ()
 void
 initial_env ()
 {
-  DWORD len;
   char buf[CYG_MAX_PATH + 1];
 #ifdef DEBUGGING
+  DWORD len;
   if (GetEnvironmentVariable ("CYGWIN_SLEEP", buf, sizeof (buf) - 1))
     {
       DWORD ms = atoi (buf);
@@ -836,14 +826,7 @@ initial_env ()
 #endif
 
   if (GetEnvironmentVariable ("CYGWIN_TESTING", buf, sizeof (buf) - 1))
-    {
-      _cygwin_testing = 1;
-      if ((len = GetModuleFileName (cygwin_hmodule, buf, CYG_MAX_PATH))
-	  && len > sizeof ("new-cygwin1.dll")
-	  && strcasematch (buf + len - sizeof ("new-cygwin1.dll"),
-			   "\\new-cygwin1.dll"))
-	_cygwin_testing_magic = 0x10;
-    }
+    _cygwin_testing = 1;
 }
 
 /* Wrap the real one, otherwise gdb gets confused about