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authorJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
commit32c075e1f01849e161724bbd400ba77244e482cc (patch)
tree5f083a3f352104f32bb6c902d57fa3f294bd8d4d /nptl/pthread_rwlock_rdlock.c
parentd6220e9ee38c1c9285221b023346201ec5f511b3 (diff)
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Diffstat (limited to 'nptl/pthread_rwlock_rdlock.c')
-rw-r--r--nptl/pthread_rwlock_rdlock.c95
1 files changed, 0 insertions, 95 deletions
diff --git a/nptl/pthread_rwlock_rdlock.c b/nptl/pthread_rwlock_rdlock.c
deleted file mode 100644
index e225d7030d..0000000000
--- a/nptl/pthread_rwlock_rdlock.c
+++ /dev/null
@@ -1,95 +0,0 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
-
-   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, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <pthread.h>
-#include <pthreadP.h>
-
-
-/* Acquire read lock for RWLOCK.  */
-int
-__pthread_rwlock_rdlock (rwlock)
-     pthread_rwlock_t *rwlock;
-{
-  int result = 0;
-
-  /* Make sure we are along.  */
-  lll_mutex_lock (rwlock->__data.__lock);
-
-  while (1)
-    {
-      /* Get the rwlock if there is no writer...  */
-      if (rwlock->__data.__writer == 0
-	  /* ...and if either no writer is waiting or we prefer readers.  */
-	  && (!rwlock->__data.__nr_writers_queued
-	      || rwlock->__data.__flags == 0))
-	{
-	  /* Increment the reader counter.  Avoid overflow.  */
-	  if (__builtin_expect (++rwlock->__data.__nr_readers == 0, 0))
-	    {
-	      /* Overflow on number of readers.	 */
-	      --rwlock->__data.__nr_readers;
-	      result = EAGAIN;
-	    }
-
-	  break;
-	}
-
-      /* Make sure we are not holding the rwlock as a writer.  This is
-	 a deadlock situation we recognize and report.  */
-      if (__builtin_expect (rwlock->__data.__writer
-			    == THREAD_GETMEM (THREAD_SELF, tid), 0))
-	{
-	  result = EDEADLK;
-	  break;
-	}
-
-      /* Remember that we are a reader.  */
-      if (__builtin_expect (++rwlock->__data.__nr_readers_queued == 0, 0))
-	{
-	  /* Overflow on number of queued readers.  */
-	  --rwlock->__data.__nr_readers_queued;
-	  result = EAGAIN;
-	  break;
-	}
-
-      int waitval = rwlock->__data.__readers_wakeup;
-
-      /* Free the lock.  */
-      lll_mutex_unlock (rwlock->__data.__lock);
-
-      /* Wait for the writer to finish.  */
-      lll_futex_wait (&rwlock->__data.__readers_wakeup, waitval);
-
-      /* Get the lock.  */
-      lll_mutex_lock (rwlock->__data.__lock);
-
-      --rwlock->__data.__nr_readers_queued;
-    }
-
-  /* We are done, free the lock.  */
-  lll_mutex_unlock (rwlock->__data.__lock);
-
-  return result;
-}
-
-weak_alias (__pthread_rwlock_rdlock, pthread_rwlock_rdlock)
-strong_alias (__pthread_rwlock_rdlock, __pthread_rwlock_rdlock_internal)