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Christopher Palow provided the patch (edited by me) that introduces 

the use of microsecond resolution keys for internal splay trees.

http://curl.haxx.se/mail/lib-2008-04/0513.html
This commit is contained in:
Yang Tse 2008-05-07 15:41:41 +00:00
Родитель 082237e2b5
Коммит eb68aa38e3
5 изменённых файлов: 76 добавлений и 51 удалений
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4
CHANGES
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@ -7,6 +7,10 @@
Changelog
Yang Tse (7 May 2008)
- Christopher Palow provided the patch (edited by me) that introduces the
use of microsecond resolution keys for internal splay trees.
Daniel Stenberg (4 May 2008)
- Yuriy Sosov pointed out a configure fix for detecting c-ares when that is
built debug-enabled.

3
RELEASE-NOTES
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@ -30,6 +30,7 @@ This release includes the following bugfixes:
o CURLOPT_TCP_NODELAY crash due to getprotobyname() use
o libcurl sometimes sent body twice when using CURLAUTH_ANY
o configure detecting debug-enabled c-ares
o microsecond resolution keys for internal splay trees
This release includes the following known bugs:
@ -51,6 +52,6 @@ advice from friends like these:
Michal Marek, Daniel Fandrich, Scott Barrett, Alexey Simak, Daniel Black,
Rafa Muyo, Andre Guibert de Bruet, Brock Noland, Sandor Feldi, Stefan Krause,
David Shaw, Norbert Frese, Bart Whiteley, Jean-Francois Bertrand, Ben Van Hof,
Yuriy Sosov
Yuriy Sosov, Christopher Palow, Yang Tse
Thanks! (and sorry if I forgot to mention someone)

34
lib/multi.c
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@ -23,9 +23,6 @@
#include "setup.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
@ -177,8 +174,8 @@ struct Curl_multi {
/* timer callback and user data pointer for the *socket() API */
curl_multi_timer_callback timer_cb;
void *timer_userp;
time_t timer_lastcall; /* the fixed time for the timeout for the previous
callback */
struct timeval timer_lastcall; /* the fixed time for the timeout for the
previous callback */
};
static bool multi_conn_using(struct Curl_multi *multi,
@ -1446,9 +1443,8 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
*/
do {
struct timeval now = Curl_tvnow();
int key = now.tv_sec; /* drop the usec part */
multi->timetree = Curl_splaygetbest(key, multi->timetree, &t);
multi->timetree = Curl_splaygetbest(now, multi->timetree, &t);
if(t) {
struct SessionHandle *d = t->payload;
struct timeval* tv = &d->state.expiretime;
@ -1746,7 +1742,6 @@ static CURLMcode multi_socket(struct Curl_multi *multi,
* handle we deal with.
*/
do {
int key;
struct timeval now;
/* the first loop lap 'data' can be NULL */
@ -1763,9 +1758,8 @@ static CURLMcode multi_socket(struct Curl_multi *multi,
extracts a matching node if there is one */
now = Curl_tvnow();
key = now.tv_sec; /* drop the usec part */
multi->timetree = Curl_splaygetbest(key, multi->timetree, &t);
multi->timetree = Curl_splaygetbest(now, multi->timetree, &t);
if(t) {
/* assign 'data' to be the easy handle we just removed from the splay
tree */
@ -1858,17 +1852,19 @@ CURLMcode curl_multi_socket_all(CURLM *multi_handle, int *running_handles)
static CURLMcode multi_timeout(struct Curl_multi *multi,
long *timeout_ms)
{
static struct timeval tv_zero = {0,0};
if(multi->timetree) {
/* we have a tree of expire times */
struct timeval now = Curl_tvnow();
/* splay the lowest to the bottom */
multi->timetree = Curl_splay(0, multi->timetree);
multi->timetree = Curl_splay(tv_zero, multi->timetree);
/* At least currently, the splay key is a time_t for the expire time */
*timeout_ms = (multi->timetree->key - now.tv_sec) * 1000 -
now.tv_usec/1000;
if(*timeout_ms < 0)
if(Curl_splaycomparekeys(multi->timetree->key, now) > 0)
/* some time left before expiration */
*timeout_ms = curlx_tvdiff(multi->timetree->key, now);
else
/* 0 means immediately */
*timeout_ms = 0;
}
@ -1908,7 +1904,7 @@ static int update_timer(struct Curl_multi *multi)
* timeout we got the (relative) time-out time for. We can thus easily check
* if this is the same (fixed) time as we got in a previous call and then
* avoid calling the callback again. */
if(multi->timetree->key == multi->timer_lastcall)
if(Curl_splaycomparekeys(multi->timetree->key, multi->timer_lastcall) == 0)
return 0;
multi->timer_lastcall = multi->timetree->key;
@ -2002,7 +1998,7 @@ void Curl_expire(struct SessionHandle *data, long milli)
if(!milli) {
/* No timeout, clear the time data. */
if(nowp->tv_sec) {
if(nowp->tv_sec || nowp->tv_usec) {
/* Since this is an cleared time, we must remove the previous entry from
the splay tree */
rc = Curl_splayremovebyaddr(multi->timetree,
@ -2030,7 +2026,7 @@ void Curl_expire(struct SessionHandle *data, long milli)
set.tv_usec -= 1000000;
}
if(nowp->tv_sec) {
if(nowp->tv_sec || nowp->tv_usec) {
/* This means that the struct is added as a node in the splay tree.
Compare if the new time is earlier, and only remove-old/add-new if it
is. */
@ -2054,7 +2050,7 @@ void Curl_expire(struct SessionHandle *data, long milli)
(long)nowp->tv_sec, (long)nowp->tv_usec, milli);
#endif
data->state.timenode.payload = data;
multi->timetree = Curl_splayinsert((int)nowp->tv_sec,
multi->timetree = Curl_splayinsert(*nowp,
multi->timetree,
&data->state.timenode);
}

62
lib/splay.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1997 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1997 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -23,24 +23,26 @@
#include "setup.h"
#include <stdio.h>
#include <stdlib.h>
#include "splay.h"
#define compare(i,j) ((i)-(j))
/* Set this to a key value that will *NEVER* appear otherwise */
#define KEY_NOTUSED -1
/*
* This macro compares two node keys i and j and returns:
*
* negative value: when i is smaller than j
* zero : when i is equal to j
* positive when : when i is larger than j
*/
#define compare(i,j) Curl_splaycomparekeys((i),(j))
/*
* Splay using the key i (which may or may not be in the tree.) The starting
* root is t.
*/
struct Curl_tree *Curl_splay(int i, struct Curl_tree *t)
struct Curl_tree *Curl_splay(struct timeval i,
struct Curl_tree *t)
{
struct Curl_tree N, *l, *r, *y;
int comp;
long comp;
if(t == NULL)
return t;
@ -93,10 +95,12 @@ struct Curl_tree *Curl_splay(int i, struct Curl_tree *t)
/* Insert key i into the tree t. Return a pointer to the resulting tree or
NULL if something went wrong. */
struct Curl_tree *Curl_splayinsert(int i,
struct Curl_tree *Curl_splayinsert(struct timeval i,
struct Curl_tree *t,
struct Curl_tree *node)
{
static struct timeval KEY_NOTUSED = {-1,-1}; /* key that will *NEVER* appear */
if(node == NULL)
return t;
@ -149,7 +153,8 @@ struct Curl_tree *Curl_splayinsert(int i,
Function not used in libcurl.
*/
struct Curl_tree *Curl_splayremove(int i, struct Curl_tree *t,
struct Curl_tree *Curl_splayremove(struct timeval i,
struct Curl_tree *t,
struct Curl_tree **removed)
{
struct Curl_tree *x;
@ -163,7 +168,7 @@ struct Curl_tree *Curl_splayremove(int i, struct Curl_tree *t,
if(compare(i, t->key) == 0) { /* found it */
/* FIRST! Check if there is a list with identical sizes */
if((x = t->same)) {
if((x = t->same) != NULL) {
/* there is, pick one from the list */
/* 'x' is the new root node */
@ -193,8 +198,9 @@ struct Curl_tree *Curl_splayremove(int i, struct Curl_tree *t,
#endif
/* Finds and deletes the best-fit node from the tree. Return a pointer to the
resulting tree. best-fit means the node with the given or lower number */
struct Curl_tree *Curl_splaygetbest(int i, struct Curl_tree *t,
resulting tree. best-fit means the node with the given or lower key */
struct Curl_tree *Curl_splaygetbest(struct timeval i,
struct Curl_tree *t,
struct Curl_tree **removed)
{
struct Curl_tree *x;
@ -217,7 +223,7 @@ struct Curl_tree *Curl_splaygetbest(int i, struct Curl_tree *t,
}
if(compare(i, t->key) >= 0) { /* found it */
/* FIRST! Check if there is a list with identical sizes */
/* FIRST! Check if there is a list with identical keys */
x = t->same;
if(x) {
/* there is, pick one from the list */
@ -263,12 +269,13 @@ int Curl_splayremovebyaddr(struct Curl_tree *t,
struct Curl_tree *removenode,
struct Curl_tree **newroot)
{
static struct timeval KEY_NOTUSED = {-1,-1}; /* key that will *NEVER* appear */
struct Curl_tree *x;
if(!t || !removenode)
return 1;
if(KEY_NOTUSED == removenode->key) {
if(compare(KEY_NOTUSED, removenode->key) == 0) {
/* Key set to NOTUSED means it is a subnode within a 'same' linked list
and thus we can unlink it easily. The 'smaller' link of a subnode
links to the parent node. */
@ -341,7 +348,11 @@ void Curl_splayprint(struct Curl_tree * t, int d, char output)
printf(" ");
if(output) {
printf("%d[%d]", t->key, i);
#ifdef TEST_SPLAY
printf("%ld[%d]", t->key.tv_usec, i);
#else
printf("%ld.%ld[%d]", t->key.tv_sec, t->key.tv_usec, i);
#endif
}
for(count=0, node = t->same; node; node = node->same, count++)
@ -382,18 +393,19 @@ int main(int argc, argv_item_t argv[])
root = NULL; /* the empty tree */
for (i = 0; i < MAX; i++) {
int key;
struct timeval key;
ptrs[i] = t = (struct Curl_tree *)malloc(sizeof(struct Curl_tree));
key.tv_sec = 0;
#ifdef TEST2
key = sizes[i];
key.tv_usec = sizes[i];
#elif defined(TEST1)
key = (541*i)%1023;
key.tv_usec = (541*i)%1023;
#elif defined(TEST3)
key = 100;
key.tv_usec = 100;
#endif
t->payload = (void *)key; /* for simplicity */
t->payload = (void *)key.tv_usec; /* for simplicity */
if(!t) {
puts("out of memory!");
return 0;
@ -412,8 +424,8 @@ int main(int argc, argv_item_t argv[])
struct Curl_tree *r;
printf("Tree look:\n");
Curl_splayprint(root, 0, 1);
printf("remove pointer %d, payload %d\n", rem,
(int)((struct Curl_tree *)ptrs[rem])->payload);
printf("remove pointer %d, payload %ld\n", rem,
(long)((struct Curl_tree *)ptrs[rem])->payload);
rc = Curl_splayremovebyaddr(root, (struct Curl_tree *)ptrs[rem], &root);
if(rc)
/* failed! */

24
lib/splay.h
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@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1997 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1997 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -27,24 +27,36 @@ struct Curl_tree {
struct Curl_tree *smaller; /* smaller node */
struct Curl_tree *larger; /* larger node */
struct Curl_tree *same; /* points to a node with identical key */
int key; /* the "sort" key */
struct timeval key; /* this node's "sort" key */
void *payload; /* data the splay code doesn't care about */
};
struct Curl_tree *Curl_splay(int i, struct Curl_tree *t);
struct Curl_tree *Curl_splayinsert(int key, struct Curl_tree *t,
struct Curl_tree *Curl_splay(struct timeval i,
struct Curl_tree *t);
struct Curl_tree *Curl_splayinsert(struct timeval key,
struct Curl_tree *t,
struct Curl_tree *newnode);
#if 0
struct Curl_tree *Curl_splayremove(int key, struct Curl_tree *t,
struct Curl_tree *Curl_splayremove(struct timeval key,
struct Curl_tree *t,
struct Curl_tree **removed);
#endif
struct Curl_tree *Curl_splaygetbest(int key, struct Curl_tree *t,
struct Curl_tree *Curl_splaygetbest(struct timeval key,
struct Curl_tree *t,
struct Curl_tree **removed);
int Curl_splayremovebyaddr(struct Curl_tree *t,
struct Curl_tree *removenode,
struct Curl_tree **newroot);
#define Curl_splaycomparekeys(i,j) ( ((i.tv_sec) < (j.tv_sec)) ? -1 : \
( ((i.tv_sec) > (j.tv_sec)) ? 1 : \
( ((i.tv_usec) < (j.tv_usec)) ? -1 : \
( ((i.tv_usec) > (j.tv_usec)) ? 1 : 0 ))))
#ifdef CURLDEBUG
void Curl_splayprint(struct Curl_tree * t, int d, char output);
#else