Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 177 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/pthread/aio_notify.c b/REORG.TODO/sysdeps/pthread/aio_notify.c
new file mode 100644
index 0000000000..03f4e001ef
--- /dev/null
+++ b/REORG.TODO/sysdeps/pthread/aio_notify.c
@@ -0,0 +1,177 @@
+/* Notify initiator of AIO request.
+   Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <aio_misc.h>
+#include <signal.h>
+
+#ifndef aio_start_notify_thread
+# define aio_start_notify_thread() do { } while (0)
+#endif
+
+struct notify_func
+  {
+    void (*func) (sigval_t);
+    sigval_t value;
+  };
+
+static void *
+notify_func_wrapper (void *arg)
+{
+  aio_start_notify_thread ();
+  struct notify_func *const n = arg;
+  void (*func) (sigval_t) = n->func;
+  sigval_t value = n->value;
+  free (n);
+  (*func) (value);
+  return NULL;
+}
+
+
+int
+internal_function
+#ifdef BROKEN_THREAD_SIGNALS
+__aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
+#else
+__aio_notify_only (struct sigevent *sigev)
+#endif
+{
+  int result = 0;
+
+  /* Send the signal to notify about finished processing of the request.  */
+  if (__glibc_unlikely (sigev->sigev_notify == SIGEV_THREAD))
+    {
+      /* We have to start a thread.  */
+      pthread_t tid;
+      pthread_attr_t attr, *pattr;
+
+      pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
+      if (pattr == NULL)
+	{
+	  pthread_attr_init (&attr);
+	  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
+	  pattr = &attr;
+	}
+
+      /* SIGEV may be freed as soon as we return, so we cannot let the
+	 notification thread use that pointer.  Even though a sigval_t is
+	 only one word and the same size as a void *, we cannot just pass
+	 the value through pthread_create as the argument and have the new
+	 thread run the user's function directly, because on some machines
+	 the calling convention for a union like sigval_t is different from
+	 that for a pointer type like void *.  */
+      struct notify_func *nf = malloc (sizeof *nf);
+      if (nf == NULL)
+	result = -1;
+      else
+	{
+	  nf->func = sigev->sigev_notify_function;
+	  nf->value = sigev->sigev_value;
+	  if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
+	    {
+	      free (nf);
+	      result = -1;
+	    }
+	}
+    }
+  else if (sigev->sigev_notify == SIGEV_SIGNAL)
+    {
+      /* We have to send a signal.  */
+#if _POSIX_REALTIME_SIGNALS > 0
+      /* Note that the standard gives us the option of using a plain
+	 non-queuing signal here when SA_SIGINFO is not set for the signal.  */
+# ifdef BROKEN_THREAD_SIGNALS
+      if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
+	  < 0)
+	result = -1;
+# else
+      if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, getpid ())
+	  < 0)
+	result = -1;
+# endif
+#else
+      /* There are no queued signals on this system at all.  */
+      result = raise (sigev->sigev_signo);
+#endif
+    }
+
+  return result;
+}
+
+
+void
+internal_function
+__aio_notify (struct requestlist *req)
+{
+  struct waitlist *waitlist;
+  struct aiocb *aiocbp = &req->aiocbp->aiocb;
+
+#ifdef BROKEN_THREAD_SIGNALS
+  if (__aio_notify_only (&aiocbp->aio_sigevent, req->caller_pid) != 0)
+#else
+  if (__aio_notify_only (&aiocbp->aio_sigevent) != 0)
+#endif
+    {
+      /* XXX What shall we do if already an error is set by
+	 read/write/fsync?  */
+      aiocbp->__error_code = errno;
+      aiocbp->__return_value = -1;
+    }
+
+  /* Now also notify possibly waiting threads.  */
+  waitlist = req->waiting;
+  while (waitlist != NULL)
+    {
+      struct waitlist *next = waitlist->next;
+
+      if (waitlist->sigevp == NULL)
+	{
+	  if (waitlist->result != NULL && aiocbp->__return_value == -1)
+	    *waitlist->result = -1;
+
+#ifdef DONT_NEED_AIO_MISC_COND
+	  AIO_MISC_NOTIFY (waitlist);
+#else
+	  /* Decrement the counter.  */
+	  --*waitlist->counterp;
+
+	  pthread_cond_signal (waitlist->cond);
+#endif
+	}
+      else
+	/* This is part of an asynchronous `lio_listio' operation.  If
+	   this request is the last one, send the signal.  */
+	if (--*waitlist->counterp == 0)
+	  {
+#ifdef BROKEN_THREAD_SIGNALS
+	    __aio_notify_only (waitlist->sigevp, waitlist->caller_pid);
+#else
+	    __aio_notify_only (waitlist->sigevp);
+#endif
+	    /* This is tricky.  See lio_listio.c for the reason why
+	       this works.  */
+	    free ((void *) waitlist->counterp);
+	  }
+
+      waitlist = next;
+    }
+}