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93af5b695c
commit
a74bc62145
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@ -1,4 +1,4 @@
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/* $NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $ */
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/* $NetBSD: pthread_mutex.c,v 1.55 2013/03/06 11:31:34 yamt Exp $ */
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/*-
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* Copyright (c) 2001, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
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@ -47,7 +47,7 @@
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $");
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__RCSID("$NetBSD: pthread_mutex.c,v 1.55 2013/03/06 11:31:34 yamt Exp $");
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#include <sys/types.h>
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#include <sys/lwpctl.h>
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@ -130,7 +130,6 @@ pthread_mutex_init(pthread_mutex_t *ptm, const pthread_mutexattr_t *attr)
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return 0;
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}
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int
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pthread_mutex_destroy(pthread_mutex_t *ptm)
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{
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@ -465,6 +464,12 @@ pthread__mutex_unlock_slow(pthread_mutex_t *ptm)
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return error;
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}
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/*
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* pthread__mutex_wakeup: unpark threads waiting for us
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*
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* unpark threads on the ptm->ptm_waiters list and self->pt_waiters.
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*/
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static void
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pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm)
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{
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@ -530,6 +535,7 @@ pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm)
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}
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}
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}
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int
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pthread_mutexattr_init(pthread_mutexattr_t *attr)
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{
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@ -578,6 +584,16 @@ pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)
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}
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}
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/*
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* pthread__mutex_deferwake: try to defer unparking threads in self->pt_waiters
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*
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* In order to avoid unnecessary contention on the interlocking mutex,
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* we defer waking up threads until we unlock the mutex. The threads will
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* be woken up when the calling thread (self) releases the first mutex with
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* MUTEX_DEFERRED_BIT set. It likely be the mutex 'ptm', but no problem
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* even if it isn't.
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*/
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void
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pthread__mutex_deferwake(pthread_t self, pthread_mutex_t *ptm)
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{
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