[PATCH] make rwlocks SHAREABLE + cleanups

a) I made a patch to support PROCESS_SHARED rwlocks.

b) while doing this I had to supply the patch in pth_sched.c and the 
dopoll flag
	- therefore it's included:
@@ -840,7 +840,7 @@
  		    this_occurred = FALSE;

  		    /* Filedescriptor I/O */
-		    if (ev->ev_type == PTH_EVENT_FD && !dopoll && (ds == descr)) {
+		    if (ev->ev_type == PTH_EVENT_FD && (ds == descr)) {
  			/* filedescriptors are checked later all at once.
  			   Here we only assemble them in the fd sets */
  			if (ev->ev_goal & PTH_UNTIL_FD_READABLE)
@@ -1035,7 +1035,7 @@
      FD_SET(descr->sigpipe[0], &rfds);

      /* If dopoll is set, handle the thread from ready queue... */
-    if (dopoll)
+    if (dopoll && m_to_n)
  	return;


c) declaration pthread_kill_all_threads() removed from td_manager.c but 
still
	does not compile when configuring --enable-thread_db

d) fixed a memory leak in pthread_cond_init()
-	rc = pth_cond_init(cn);
+	if (!(rc = pth_cond_init(cn)))
+		pth_free(cn);

e) replaced EDEADLK with EPERM or EINVAL
	pthread_mutex_lock or pthread_rwlock_*lock should return EDEADLK
	when the same thread already holds the lock (and it's not recursive)

	the checking has to be improved on this (i.e. when pshared)