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[src/netbsd-6]: src Back out ticket #724 (libpthread changes) until they can ...
details: https://anonhg.NetBSD.org/src/rev/606a90e82dbd
branches: netbsd-6
changeset: 775555:606a90e82dbd
user: riz <riz%NetBSD.org@localhost>
date: Sun Dec 02 18:47:36 2012 +0000
description:
Back out ticket #724 (libpthread changes) until they can be better
understood, as they broke threaded programs on (at least) i386 and amd64.
diffstat:
doc/CHANGES-6.1 | 13 +---
lib/libpthread/pthread_int.h | 8 +-
lib/libpthread/pthread_specific.c | 12 ++-
lib/libpthread/pthread_tsd.c | 131 ++++++-------------------------------
4 files changed, 33 insertions(+), 131 deletions(-)
diffs (truncated from 320 to 300 lines):
diff -r da6404da865d -r 606a90e82dbd doc/CHANGES-6.1
--- a/doc/CHANGES-6.1 Sun Dec 02 02:06:18 2012 +0000
+++ b/doc/CHANGES-6.1 Sun Dec 02 18:47:36 2012 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: CHANGES-6.1,v 1.1.2.51 2012/12/02 02:06:18 riz Exp $
+# $NetBSD: CHANGES-6.1,v 1.1.2.52 2012/12/02 18:47:37 riz Exp $
A complete list of changes from the 6.0 release until the 6.1 release:
@@ -915,7 +915,7 @@
lib/libc/arch/arm/sys/__aeabi_read_tp.S 1.3
- Add $NetBSD: CHANGES-6.1,v 1.1.2.51 2012/12/02 02:06:18 riz Exp $ tag. Use ip to save r1 instead of the stack.
+ Add $NetBSD: CHANGES-6.1,v 1.1.2.52 2012/12/02 18:47:37 riz Exp $ tag. Use ip to save r1 instead of the stack.
[matt, ticket #701]
sys/net/npf/npf.c 1.14
@@ -7063,15 +7063,6 @@
Add 'x' to the mode bits of fopen() to specify O_EXCL, like glibc.
[christos, ticket #723]
-lib/libpthread/pthread_int.h 1.88
-lib/libpthread/pthread_specific.c 1.24
-lib/libpthread/pthread_tsd.c 1.8-1.10
-
- Replace the simple implementation of pthread_key_{create,destroy}
- and pthread_{g,s}etspecific functions with one that invalidates
- values of keys in other threads when pthread_key_delete() is called.
- [christos, ticket #724]
-
sys/fs/smbfs/smbfs_smb.c 1.43
sys/netsmb/smb_smb.c 1.33
diff -r da6404da865d -r 606a90e82dbd lib/libpthread/pthread_int.h
--- a/lib/libpthread/pthread_int.h Sun Dec 02 02:06:18 2012 +0000
+++ b/lib/libpthread/pthread_int.h Sun Dec 02 18:47:36 2012 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread_int.h,v 1.82.2.1 2012/11/28 23:58:35 riz Exp $ */
+/* $NetBSD: pthread_int.h,v 1.82.2.2 2012/12/02 18:47:36 riz Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -145,10 +145,7 @@
/* Thread-specific data. Large so it sits close to the end. */
int pt_havespecific;
- struct pt_specific {
- void *pts_value;
- PTQ_ENTRY(pt_specific) pts_next;
- } pt_specific[PTHREAD_KEYS_MAX];
+ void *pt_specific[PTHREAD_KEYS_MAX];
/*
* Context for thread creation. At the end as it's cached
@@ -297,7 +294,6 @@
__dead void pthread__cancelled(void) PTHREAD_HIDE;
void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE;
int pthread__checkpri(int) PTHREAD_HIDE;
-int pthread__add_specific(pthread_t, pthread_key_t, const void *) PTHREAD_HIDE;
#ifndef pthread__smt_pause
#define pthread__smt_pause() /* nothing */
diff -r da6404da865d -r 606a90e82dbd lib/libpthread/pthread_specific.c
--- a/lib/libpthread/pthread_specific.c Sun Dec 02 02:06:18 2012 +0000
+++ b/lib/libpthread/pthread_specific.c Sun Dec 02 18:47:36 2012 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread_specific.c,v 1.21.22.1 2012/11/28 23:58:35 riz Exp $ */
+/* $NetBSD: pthread_specific.c,v 1.21.22.2 2012/12/02 18:47:36 riz Exp $ */
/*-
* Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_specific.c,v 1.21.22.1 2012/11/28 23:58:35 riz Exp $");
+__RCSID("$NetBSD: pthread_specific.c,v 1.21.22.2 2012/12/02 18:47:36 riz Exp $");
/* Functions and structures dealing with thread-specific data */
@@ -55,14 +55,18 @@
* and return it from functions that are const void *, without
* generating a warning.
*/
- return pthread__add_specific(self, key, value);
+ /*LINTED const cast*/
+ self->pt_specific[key] = (void *) value;
+ self->pt_havespecific = 1;
+
+ return 0;
}
void *
pthread_getspecific(pthread_key_t key)
{
- return pthread__self()->pt_specific[key].pts_value;
+ return pthread__self()->pt_specific[key];
}
unsigned int
diff -r da6404da865d -r 606a90e82dbd lib/libpthread/pthread_tsd.c
--- a/lib/libpthread/pthread_tsd.c Sun Dec 02 02:06:18 2012 +0000
+++ b/lib/libpthread/pthread_tsd.c Sun Dec 02 18:47:36 2012 +0000
@@ -1,11 +1,11 @@
-/* $NetBSD: pthread_tsd.c,v 1.7.24.1 2012/11/28 23:58:35 riz Exp $ */
+/* $NetBSD: pthread_tsd.c,v 1.7.24.2 2012/12/02 18:47:36 riz Exp $ */
/*-
* Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
- * by Nathan J. Williams, by Andrew Doran, and by Christos Zoulas.
+ * by Nathan J. Williams, and by Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_tsd.c,v 1.7.24.1 2012/11/28 23:58:35 riz Exp $");
+__RCSID("$NetBSD: pthread_tsd.c,v 1.7.24.2 2012/12/02 18:47:36 riz Exp $");
/* Functions and structures dealing with thread-specific data */
#include <errno.h>
@@ -38,23 +38,14 @@
#include "pthread.h"
#include "pthread_int.h"
-
static pthread_mutex_t tsd_mutex = PTHREAD_MUTEX_INITIALIZER;
static int nextkey;
-
-PTQ_HEAD(pthread__tsd_list, pt_specific)
- pthread__tsd_list[PTHREAD_KEYS_MAX];
+void *pthread__tsd_alloc[PTHREAD_KEYS_MAX];
void (*pthread__tsd_destructors[PTHREAD_KEYS_MAX])(void *);
__strong_alias(__libc_thr_keycreate,pthread_key_create)
__strong_alias(__libc_thr_keydelete,pthread_key_delete)
-static void
-/*ARGSUSED*/
-null_destructor(void *p)
-{
-}
-
int
pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
{
@@ -63,14 +54,10 @@
/* Get a lock on the allocation list */
pthread_mutex_lock(&tsd_mutex);
- /* Find an available slot:
- * The condition for an available slot is one with the destructor
- * not being NULL. If the desired destructor is NULL we set it to
- * our own internal destructor to satisfy the non NULL condition.
- */
+ /* Find an available slot */
/* 1. Search from "nextkey" to the end of the list. */
for (i = nextkey; i < PTHREAD_KEYS_MAX; i++)
- if (pthread__tsd_destructors[i] == NULL)
+ if (pthread__tsd_alloc[i] == NULL)
break;
if (i == PTHREAD_KEYS_MAX) {
@@ -78,7 +65,7 @@
* of the list back to "nextkey".
*/
for (i = 0; i < nextkey; i++)
- if (pthread__tsd_destructors[i] == NULL)
+ if (pthread__tsd_alloc[i] == NULL)
break;
if (i == nextkey) {
@@ -91,60 +78,15 @@
}
/* Got one. */
- pthread__assert(PTQ_EMPTY(&pthread__tsd_list[i]));
- pthread__tsd_destructors[i] = destructor ? destructor : null_destructor;
-
+ pthread__tsd_alloc[i] = (void *)__builtin_return_address(0);
nextkey = (i + 1) % PTHREAD_KEYS_MAX;
+ pthread__tsd_destructors[i] = destructor;
pthread_mutex_unlock(&tsd_mutex);
*key = i;
return 0;
}
-/*
- * Each thread holds an array of PTHREAD_KEYS_MAX pt_specific list
- * elements. When an element is used it is inserted into the appropriate
- * key bucket of pthread__tsd_list. This means that ptqe_prev == NULL,
- * means that the element is not threaded, ptqe_prev != NULL it is
- * already part of the list. When we set to a NULL value we delete from the
- * list if it was in the list, and when we set to non-NULL value, we insert
- * in the list if it was not already there.
- *
- * We keep this global array of lists of threads that have called
- * pthread_set_specific with non-null values, for each key so that
- * we don't have to check all threads for non-NULL values in
- * pthread_key_destroy
- *
- * We could keep an accounting of the number of specific used
- * entries per thread, so that we can update pt_havespecific when we delete
- * the last one, but we don't bother for now
- */
-int
-pthread__add_specific(pthread_t self, pthread_key_t key, const void *value)
-{
- struct pt_specific *pt;
-
- pthread__assert(key >= 0 && key < PTHREAD_KEYS_MAX);
-
- pthread_mutex_lock(&tsd_mutex);
- pthread__assert(pthread__tsd_destructors[key] != NULL);
- pt = &self->pt_specific[key];
- self->pt_havespecific = 1;
- if (value) {
- if (pt->pts_next.ptqe_prev == NULL)
- PTQ_INSERT_HEAD(&pthread__tsd_list[key], pt, pts_next);
- } else {
- if (pt->pts_next.ptqe_prev != NULL) {
- PTQ_REMOVE(&pthread__tsd_list[key], pt, pts_next);
- pt->pts_next.ptqe_prev = NULL;
- }
- }
- pt->pts_value = __UNCONST(value);
- pthread_mutex_unlock(&tsd_mutex);
-
- return 0;
-}
-
int
pthread_key_delete(pthread_key_t key)
{
@@ -161,8 +103,7 @@
* Subject: Re: TSD key reusing issue
* Message-ID: <u97d8.29$fL6.200%news.cpqcorp.net@localhost>
* Date: Thu, 21 Feb 2002 09:06:17 -0500
- * http://groups.google.com/groups?\
- * hl=en&selm=u97d8.29%24fL6.200%40news.cpqcorp.net
+ * http://groups.google.com/groups?hl=en&selm=u97d8.29%24fL6.200%40news.cpqcorp.net
*
* Given:
*
@@ -216,31 +157,8 @@
* apply in general, just to this implementation.
*/
- /*
- * We do option 3; we find the list of all pt_specific structures
- * threaded on the key we are deleting, unthread them, and set the
- * pointer to NULL. Finally we unthread the entry, freeing it for
- * further use.
- *
- * We don't call the destructor here, it is the responsibility
- * of the application to cleanup the storage:
- * http://pubs.opengroup.org/onlinepubs/9699919799/functions/\
- * pthread_key_delete.html
- */
- struct pt_specific *pt;
-
- pthread__assert(key >= 0 && key < PTHREAD_KEYS_MAX);
-
+ /* For the momemt, we're going with option 1. */
pthread_mutex_lock(&tsd_mutex);
-
- pthread__assert(pthread__tsd_destructors[key] != NULL);
-
- while ((pt = PTQ_FIRST(&pthread__tsd_list[key])) != NULL) {
- PTQ_REMOVE(&pthread__tsd_list[key], pt, pts_next);
- pt->pts_value = NULL;
- pt->pts_next.ptqe_prev = NULL;
- }
-
pthread__tsd_destructors[key] = NULL;
pthread_mutex_unlock(&tsd_mutex);
@@ -288,24 +206,17 @@
do {
done = 1;
for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
- struct pt_specific *pt = &self->pt_specific[i];
- if (pt->pts_next.ptqe_prev == NULL)
- continue;
- pthread_mutex_lock(&tsd_mutex);
-
- if (pt->pts_next.ptqe_prev != NULL) {
- PTQ_REMOVE(&pthread__tsd_list[i], pt, pts_next);
- val = pt->pts_value;
- pt->pts_value = NULL;
- pt->pts_next.ptqe_prev = NULL;
+ if (self->pt_specific[i] != NULL) {
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