Add a comment describing some limitiations of this implementation.
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/* $NetBSD: pthread_cond.c,v 1.46 2008/05/26 00:16:35 ad Exp $ */
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/* $NetBSD: pthread_cond.c,v 1.47 2008/05/26 02:06:21 ad Exp $ */
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/*-
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* Copyright (c) 2001, 2006, 2007, 2008 The NetBSD Foundation, Inc.
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* We assume that there will be no contention on pthread_cond_t::ptc_lock
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* because functioning applications must call both the wait and wakeup
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* functions while holding the same application provided mutex. The
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* spinlock is present only to prevent libpthread causing the application
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* to crash or malfunction as a result of corrupted data structures, in
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* the event that the application is buggy.
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*
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* If there is contention on spinlock when real-time threads are in use,
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* it could cause a deadlock due to priority inversion: the thread holding
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* the spinlock may not get CPU time to make forward progress and release
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* the spinlock to a higher priority thread that is waiting for it.
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* Contention on the spinlock will only occur with buggy applications,
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* so at the time of writing it's not considered a major bug in libpthread.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_cond.c,v 1.46 2008/05/26 00:16:35 ad Exp $");
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__RCSID("$NetBSD: pthread_cond.c,v 1.47 2008/05/26 02:06:21 ad Exp $");
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#include <errno.h>
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#include <sys/time.h>
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