Merged revisions 65459,65472,65481,65518,65536,65581,65609,65637,65641,65644-65645 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r65459 | gregory.p.smith | 2008-08-04 00:13:29 +0000 (Mon, 04 Aug 2008) | 4 lines

  - Issue #1857: subprocess.Popen.poll gained an additional _deadstate keyword
    argument in python 2.5, this broke code that subclassed Popen to include its
    own poll method.  Fixed my moving _deadstate to an _internal_poll method.
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  r65472 | andrew.kuchling | 2008-08-04 01:43:43 +0000 (Mon, 04 Aug 2008) | 3 lines

  Bug 3228: Explicitly supply the file mode to avoid creating executable files,
  and add corresponding tests.
  Possible 2.5 backport candidate
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  r65481 | gregory.p.smith | 2008-08-04 07:33:37 +0000 (Mon, 04 Aug 2008) | 22 lines

  Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
  key list data structure in the thread startup path.

  This change is a companion to r60148 which already successfully dealt with a
  similar issue on thread shutdown.

  In particular this loop has been observed happening from this call path:
   #0  in find_key ()
   #1  in PyThread_set_key_value ()
   #2  in _PyGILState_NoteThreadState ()
   #3  in PyThreadState_New ()
   #4  in t_bootstrap ()
   #5  in pthread_start_thread ()

  I don't know how this happens but it does, *very* rarely.  On more than
  one hardware platform.  I have not been able to reproduce it manually.
  (A flaky mutex implementation on the system in question is one hypothesis).

  As with r60148, the spinning we managed to observe in the wild was due to a
  single list element pointing back upon itself.
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  r65518 | mark.dickinson | 2008-08-04 21:30:09 +0000 (Mon, 04 Aug 2008) | 7 lines

  Issue #1481296: (again!) Make conversion of a float NaN to an int or
  long raise ValueError instead of returning 0.  Also, change the error
  message for conversion of an infinity to an integer, replacing 'long' by
  'integer', so that it's appropriate for both long(float('inf')) and
  int(float('inf')).
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  r65536 | andrew.kuchling | 2008-08-05 01:00:57 +0000 (Tue, 05 Aug 2008) | 1 line

  Bug 3228: take a test from Niels Gustaebel's patch, and based on his patch, check for having os.stat available
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  r65581 | guido.van.rossum | 2008-08-07 18:51:38 +0000 (Thu, 07 Aug 2008) | 3 lines

  Patch by Ian Charnas from issue 3517.
  Add F_FULLFSYNC if it exists (OS X only so far).
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  r65609 | antoine.pitrou | 2008-08-09 17:22:25 +0000 (Sat, 09 Aug 2008) | 3 lines

  #3205: bz2 iterator fails silently on MemoryError
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  r65637 | georg.brandl | 2008-08-11 09:07:59 +0000 (Mon, 11 Aug 2008) | 3 lines

  - Issue #3537: Fix an assertion failure when an empty but presized dict
    object was stored in the freelist.
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  r65641 | jesse.noller | 2008-08-11 14:28:07 +0000 (Mon, 11 Aug 2008) | 2 lines

  Remove the fqdn call for issue 3270
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  r65644 | antoine.pitrou | 2008-08-11 17:21:36 +0000 (Mon, 11 Aug 2008) | 3 lines

  #3134: shutil referenced undefined WindowsError symbol
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  r65645 | jesse.noller | 2008-08-11 19:00:15 +0000 (Mon, 11 Aug 2008) | 2 lines

  Fix the connection refused error part of issue 3419, use errno module instead of a static list of possible connection refused messages.
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1 files changed, 11 insertions, 1 deletions

diff --git a/Python/thread.c b/Python/thread.c
index 41fa1e6..d8cadba 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -260,15 +260,25 @@ static int nkeys = 0;  /* PyThread_create_key() hands out nkeys+1 next */
 static struct key *
 find_key(int key, void *value)
 {
-	struct key *p;
+	struct key *p, *prev_p;
 	long id = PyThread_get_thread_ident();
 
 	if (!keymutex)
 		return NULL;
 	PyThread_acquire_lock(keymutex, 1);
+	prev_p = NULL;
 	for (p = keyhead; p != NULL; p = p->next) {
 		if (p->id == id && p->key == key)
 			goto Done;
+		/* Sanity check.  These states should never happen but if
+		 * they do we must abort.  Otherwise we'll end up spinning in
+		 * in a tight loop with the lock held.  A similar check is done
+		 * in pystate.c tstate_delete_common().  */
+		if (p == prev_p)
+			Py_FatalError("tls find_key: small circular list(!)");
+		prev_p = p;
+		if (p->next == keyhead)
+			Py_FatalError("tls find_key: circular list(!)");
 	}
 	if (value == NULL) {
 		assert(p == NULL);