linux/tools/perf/util/rblist.c
Jin Yao 33fec3e393 perf rblist: Create rblist__exit() function
Currently we have a rblist__delete() which is used to delete a rblist.
While rblist__delete() will free the pointer of rblist at the end.

It's an inconvenience for the user to delete a rblist which is not
allocated by something like malloc(). For example, the rblist is
embedded in a larger data structure.

This patch creates a new function rblist__exit() which is similar to
rblist__delete() but it will not free the pointer of rblist.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1512125856-22056-2-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-12-05 10:24:31 -03:00

134 lines
2.4 KiB
C

/*
* Based on strlist.c by:
* (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
*
* Licensed under the GPLv2.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "rblist.h"
int rblist__add_node(struct rblist *rblist, const void *new_entry)
{
struct rb_node **p = &rblist->entries.rb_node;
struct rb_node *parent = NULL, *new_node;
while (*p != NULL) {
int rc;
parent = *p;
rc = rblist->node_cmp(parent, new_entry);
if (rc > 0)
p = &(*p)->rb_left;
else if (rc < 0)
p = &(*p)->rb_right;
else
return -EEXIST;
}
new_node = rblist->node_new(rblist, new_entry);
if (new_node == NULL)
return -ENOMEM;
rb_link_node(new_node, parent, p);
rb_insert_color(new_node, &rblist->entries);
++rblist->nr_entries;
return 0;
}
void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
{
rb_erase(rb_node, &rblist->entries);
--rblist->nr_entries;
rblist->node_delete(rblist, rb_node);
}
static struct rb_node *__rblist__findnew(struct rblist *rblist,
const void *entry,
bool create)
{
struct rb_node **p = &rblist->entries.rb_node;
struct rb_node *parent = NULL, *new_node = NULL;
while (*p != NULL) {
int rc;
parent = *p;
rc = rblist->node_cmp(parent, entry);
if (rc > 0)
p = &(*p)->rb_left;
else if (rc < 0)
p = &(*p)->rb_right;
else
return parent;
}
if (create) {
new_node = rblist->node_new(rblist, entry);
if (new_node) {
rb_link_node(new_node, parent, p);
rb_insert_color(new_node, &rblist->entries);
++rblist->nr_entries;
}
}
return new_node;
}
struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
{
return __rblist__findnew(rblist, entry, false);
}
struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
{
return __rblist__findnew(rblist, entry, true);
}
void rblist__init(struct rblist *rblist)
{
if (rblist != NULL) {
rblist->entries = RB_ROOT;
rblist->nr_entries = 0;
}
return;
}
void rblist__exit(struct rblist *rblist)
{
struct rb_node *pos, *next = rb_first(&rblist->entries);
while (next) {
pos = next;
next = rb_next(pos);
rblist__remove_node(rblist, pos);
}
}
void rblist__delete(struct rblist *rblist)
{
if (rblist != NULL) {
rblist__exit(rblist);
free(rblist);
}
}
struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
{
struct rb_node *node;
for (node = rb_first(&rblist->entries); node; node = rb_next(node)) {
if (!idx--)
return node;
}
return NULL;
}