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This commit is contained in:
yamt 2013-03-06 11:31:34 +00:00
parent 93af5b695c
commit a74bc62145
1 changed files with 19 additions and 3 deletions
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22
lib/libpthread/pthread_mutex.c
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $ */ /* $NetBSD: pthread_mutex.c,v 1.55 2013/03/06 11:31:34 yamt Exp $ */
/*- /*-
* Copyright (c) 2001, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc. * Copyright (c) 2001, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@ -47,7 +47,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__RCSID("$NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $"); __RCSID("$NetBSD: pthread_mutex.c,v 1.55 2013/03/06 11:31:34 yamt Exp $");
#include <sys/types.h> #include <sys/types.h>
#include <sys/lwpctl.h> #include <sys/lwpctl.h>
@ -130,7 +130,6 @@ pthread_mutex_init(pthread_mutex_t *ptm, const pthread_mutexattr_t *attr)
return 0; return 0;
} }
int int
pthread_mutex_destroy(pthread_mutex_t *ptm) pthread_mutex_destroy(pthread_mutex_t *ptm)
{ {
@ -465,6 +464,12 @@ pthread__mutex_unlock_slow(pthread_mutex_t *ptm)
return error; return error;
} }
/*
* pthread__mutex_wakeup: unpark threads waiting for us
*
* unpark threads on the ptm->ptm_waiters list and self->pt_waiters.
*/
static void static void
pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm) pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm)
{ {
@ -530,6 +535,7 @@ pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm)
} }
} }
} }
int int
pthread_mutexattr_init(pthread_mutexattr_t *attr) pthread_mutexattr_init(pthread_mutexattr_t *attr)
{ {
@ -578,6 +584,16 @@ pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)
} }
} }
/*
* pthread__mutex_deferwake: try to defer unparking threads in self->pt_waiters
*
* In order to avoid unnecessary contention on the interlocking mutex,
* we defer waking up threads until we unlock the mutex. The threads will
* be woken up when the calling thread (self) releases the first mutex with
* MUTEX_DEFERRED_BIT set. It likely be the mutex 'ptm', but no problem
* even if it isn't.
*/
void void
pthread__mutex_deferwake(pthread_t self, pthread_mutex_t *ptm) pthread__mutex_deferwake(pthread_t self, pthread_mutex_t *ptm)
{ {