* Makefile.in (DLL_OFILES): Add cygthread.o.

* dcrt0.cc (dll_crt0_1): Eliminate various thread initialization functions in
favor of new cygthread class.
* debug.cc: Remove thread manipulation functions.
* debug.h: Ditto.
* external.cc (cygwin_internal): Use cygthread method for determining thread
name.  Remove capability for setting thread name.
* fhandler_console.cc (fhandler_console::read): Use cygthread method rather
than iscygthread function.
* fhandler_tty.cc (fhandler_tty_master::fhandler_tty_master): Use cygthread
methods to create threads.
(fhandler_tty_common::__acquire_output_mutex): Use cygthread method to retrieve
thread name.
* select.cc (pipeinf): Use cygthread pointer rather than handle.
(start_thread_pipe): Ditto.
(pipe_cleanup): Ditto.
(serialinf): Ditto.
(start_thread_serial): Ditto.
(serial_cleanup): Ditto.
(socketinf): Ditto.
(start_thread_socket): Ditto.
(socket_cleanup): Ditto.
* sigproc.cc (hwait_sig): Ditto.
(hwait_subproc): Ditto.
(proc_terminate): Ditto.
(sigproc_terminate): Ditto.
(sigproc_init): Initialize cygthread hwait_sig pointer.
(subproc_init): Initialize cygthread hwait_subproc pointer.
(wait_sig): Rely on cygthread HANDLE operator.
* strace.cc (strace::vsprntf): Use cygthread::name rather than threadname.
* window.cc (gethwnd): Use cygthread method to initialize thread.

winsup/cygwin/cygthread.cc

@@ -0,0 +1,186 @@
+/* cygthread.cc
+
+   Copyright 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+class cygthread
+{
+  DWORD avail;
+  DWORD id;
+  HANDLE h;
+  HANDLE ev;
+  const char *__name;
+  LPTHREAD_START_ROUTINE func;
+  VOID *arg;
+  static DWORD main_thread_id;
+  static DWORD WINAPI runner (VOID *);
+  static DWORD WINAPI stub (VOID *);
+ public:
+  static const char * name (DWORD = 0);
+  cygthread (LPTHREAD_START_ROUTINE, LPVOID, const char *);
+  cygthread () {};
+  static void init ();
+  void detach ();
+  operator HANDLE ();
+  static bool is ();
+  void * operator new (size_t);
+};
+#include "winsup.h"
+#include "exceptions.h"
+#include "security.h"
+#include "cygthread.h"
+#include <windows.h>
+
+#undef CloseHandle
+
+static cygthread NO_COPY threads[8];
+#define NTHREADS (sizeof (threads) / sizeof (threads[0]))
+
+static HANDLE NO_COPY hthreads[NTHREADS];
+
+DWORD NO_COPY cygthread::main_thread_id;
+
+/* Initial stub called by makethread. Performs initial per-thread
+   initialization.  */
+DWORD WINAPI
+cygthread::stub (VOID *arg)
+{
+  DECLARE_TLS_STORAGE;
+  exception_list except_entry;
+
+  /* Initialize this thread's ability to respond to things like
+     SIGSEGV or SIGFPE. */
+  init_exceptions (&except_entry);
+
+  cygthread *info = (cygthread *) arg;
+  info->ev = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
+  while (1)
+    {
+      if (!info->func)
+	ExitThread (0);
+
+      /* Cygwin threads should not call ExitThread */
+      info->func (info->arg);
+
+      info->__name = NULL;
+      SetEvent (info->ev);
+      SuspendThread (info->h);
+    }
+}
+
+DWORD WINAPI
+cygthread::runner (VOID *arg)
+{
+  for (unsigned i = 0; i < NTHREADS; i++)
+    hthreads[i] = threads[i].h =
+      CreateThread (&sec_none_nih, 0, cygthread::stub, &threads[i],
+		    CREATE_SUSPENDED, &threads[i].avail);
+  return 0;
+}
+
+void
+cygthread::init ()
+{
+  DWORD tid;
+  HANDLE h = CreateThread (&sec_none_nih, 0, cygthread::runner, NULL, 0, &tid);
+  if (!h)
+    api_fatal ("can't start thread_runner, %E");
+  CloseHandle (h);
+  main_thread_id = GetCurrentThreadId ();
+}
+
+bool
+cygthread::is ()
+{
+  DWORD tid = GetCurrentThreadId ();
+
+  for (DWORD i = 0; i < NTHREADS; i++)
+    if (threads[i].id == tid)
+      return 1;
+
+  return 0;
+}
+
+void * cygthread::operator
+new (size_t)
+{
+  DWORD id;
+  cygthread *info; /* Various information needed by the newly created thread */
+
+  for (;;)
+    {
+      /* Search the threads array for an empty slot to use */
+      for (info = threads; info < threads + NTHREADS; info++)
+	if ((id = (DWORD) InterlockedExchange ((LPLONG) &info->avail, 0)))
+	  {
+	    info->id = id;
+	    return info;
+	  }
+
+      /* thread_runner may not be finished yet. */
+      Sleep (0);
+    }
+}
+
+cygthread::cygthread (LPTHREAD_START_ROUTINE start, LPVOID param,
+		      const char *name): __name (name), func (start), arg (param)
+{
+  while (ResumeThread (h) == 0)
+    Sleep (0);
+}
+
+/* Return the symbolic name of the current thread for debugging.
+ */
+const char *
+cygthread::name (DWORD tid)
+{
+  const char *res = NULL;
+  if (!tid)
+    tid = GetCurrentThreadId ();
+
+  if (tid == main_thread_id)
+    return "main";
+
+  for (DWORD i = 0; i < NTHREADS; i++)
+    if (threads[i].id == tid)
+      {
+	res = threads[i].__name ?: "exiting thread";
+	break;
+      }
+
+  if (!res)
+    {
+      static char buf[30] NO_COPY = {0};
+      __small_sprintf (buf, "unknown (%p)", tid);
+      res = buf;
+    }
+
+  return res;
+}
+
+cygthread::operator
+HANDLE ()
+{
+  while (!ev)
+    Sleep (0);
+  return ev;
+}
+
+void
+cygthread::detach ()
+{
+  if (!avail)
+    {
+      DWORD avail = id;
+      if (__name)
+	{
+	  DWORD res = WaitForSingleObject (*this, INFINITE);
+	  debug_printf ("WFSO returns %d", res);
+	}
+      id = 0;
+      (void) InterlockedExchange ((LPLONG) &this->avail, avail);
+    }
+}