rt: Move generic implementation from sysdeps/pthread to rt

The pthread-based implementation is the generic one.  Replacing
the stubs makes it clear that they do not have to be adjusted for
the libpthread move.

Result of:

    git mv -f sysdeps/pthread/aio_misc.h sysdeps/generic/
    git mv sysdeps/pthread/timer_routines.c sysdeps/htl/
    git mv -f sysdeps/pthread/{aio,lio,timer}_*.c rt/

Followed by manual adjustment of the #include paths in
sysdeps/unix/sysv/linux/wordsize-64, and a move of the version
definitions formerly in sysdeps/pthread/Versions.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 79 insertions, 4 deletions

diff --git a/sysdeps/generic/aio_misc.h b/sysdeps/generic/aio_misc.h
index 1307d822a0..e23524cffe 100644
--- a/sysdeps/generic/aio_misc.h
+++ b/sysdeps/generic/aio_misc.h
@@ -1,5 +1,4 @@
-/* Internal declarations for <aio.h> functions implementation.  Stub version.
-   Copyright (C) 2001-2021 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,17 +19,19 @@
 #define _AIO_MISC_H	1
 
 #include <aio.h>
+#include <pthread.h>
 
 
 /* Extend the operation enum.  */
 enum
 {
-  LIO_DSYNC = LIO_READ + 1,
+  LIO_DSYNC = LIO_NOP + 1,
   LIO_SYNC,
   LIO_READ64 = LIO_READ | 128,
   LIO_WRITE64 = LIO_WRITE | 128
 };
 
+
 /* Union of the two request types.  */
 typedef union
   {
@@ -39,9 +40,83 @@ typedef union
   } aiocb_union;
 
 
+/* Used to synchronize.  */
+struct waitlist
+  {
+    struct waitlist *next;
+
+    /* The next two fields is used in synchronous `lio_listio' operations.  */
+#ifndef DONT_NEED_AIO_MISC_COND
+    pthread_cond_t *cond;
+#endif
+    int *result;
+
+    volatile unsigned int *counterp;
+    /* The next field is used in asynchronous `lio_listio' operations.  */
+    struct sigevent *sigevp;
+  };
+
+
+/* Status of a request.  */
+enum
+{
+  no,
+  queued,
+  yes,
+  allocated,
+  done
+};
+
+
+/* Used to queue requests..  */
+struct requestlist
+  {
+    int running;
+
+    struct requestlist *last_fd;
+    struct requestlist *next_fd;
+    struct requestlist *next_prio;
+    struct requestlist *next_run;
+
+    /* Pointer to the actual data.  */
+    aiocb_union *aiocbp;
+
+    /* List of waiting processes.  */
+    struct waitlist *waiting;
+  };
+
+
+/* Lock for global I/O list of requests.  */
+extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
+
+
+/* Enqueue request.  */
+extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
+						  int operation)
+  attribute_hidden;
+
+/* Find request entry for given AIO control block.  */
+extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;
+
+/* Find request entry for given file descriptor.  */
+extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;
+
+/* Remove request from the list.  */
+extern void __aio_remove_request (struct requestlist *last,
+				  struct requestlist *req, int all)
+     attribute_hidden;
+
+/* Release the entry for the request.  */
+extern void __aio_free_request (struct requestlist *req) attribute_hidden;
+
+/* Notify initiator of request and tell this everybody listening.  */
+extern void __aio_notify (struct requestlist *req) attribute_hidden;
+
+/* Notify initiator of request.  */
+extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;
+
 /* Send the signal.  */
 extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
      attribute_hidden;
 
-
 #endif /* aio_misc.h */