mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
114 lines
2.1 KiB
C
114 lines
2.1 KiB
C
/*
|
|
* Beat up the pthread_key_create and pthread_key_delete
|
|
* functions.
|
|
*/
|
|
|
|
#if 0
|
|
#define CHATTY
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
|
|
const int beatup_iterations = 10000;
|
|
const int num_threads = 30;
|
|
const int max_keys = 500;
|
|
|
|
struct key_list {
|
|
struct key_list *next;
|
|
pthread_key_t key;
|
|
};
|
|
|
|
struct key_list *key_list;
|
|
pthread_mutex_t key_lock = PTHREAD_MUTEX_INITIALIZER;
|
|
|
|
/*
|
|
* Create a new key and put it at the tail of a linked list.
|
|
* If the linked list grows to a certain length, delete a key from the
|
|
* head of * the list.
|
|
*/
|
|
|
|
static void
|
|
beat_up(void)
|
|
{
|
|
struct key_list *new = malloc(sizeof *new);
|
|
struct key_list **iter, *old_key = 0;
|
|
int key_count = 0;
|
|
|
|
if (new == 0) {
|
|
fprintf(stderr, "malloc failed\n");
|
|
abort();
|
|
}
|
|
|
|
new->next = 0;
|
|
|
|
if (pthread_key_create(&new->key, 0) != 0) {
|
|
fprintf(stderr, "pthread_key_create failed\n");
|
|
abort();
|
|
}
|
|
|
|
if (pthread_getspecific(new->key) != 0) {
|
|
fprintf(stderr, "new pthread_key_t resolves to non-null value\n");
|
|
abort();
|
|
}
|
|
|
|
pthread_setspecific(new->key, (void *) 1);
|
|
|
|
#ifdef CHATTY
|
|
printf("created key\n");
|
|
#endif
|
|
|
|
pthread_mutex_lock(&key_lock);
|
|
|
|
for (iter = &key_list; *iter != 0; iter = &(*iter)->next)
|
|
key_count++;
|
|
|
|
*iter = new;
|
|
|
|
if (key_count > max_keys) {
|
|
old_key = key_list;
|
|
key_list = key_list->next;
|
|
}
|
|
|
|
pthread_mutex_unlock(&key_lock);
|
|
|
|
if (old_key != 0) {
|
|
#ifdef CHATTY
|
|
printf("deleting key\n");
|
|
#endif
|
|
pthread_key_delete(old_key->key);
|
|
}
|
|
}
|
|
|
|
static void *
|
|
thread(void *arg)
|
|
{
|
|
int i;
|
|
for (i = 0; i < beatup_iterations; i++)
|
|
beat_up();
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
int i;
|
|
pthread_attr_t detached_thread;
|
|
|
|
pthread_attr_init(&detached_thread);
|
|
pthread_attr_setdetachstate(&detached_thread, PTHREAD_CREATE_DETACHED);
|
|
|
|
for (i = 0; i < num_threads; i++) {
|
|
pthread_t thread_id;
|
|
while (pthread_create(&thread_id, &detached_thread, thread, 0) == EAGAIN) {
|
|
/* let some threads die, so system can breathe. :) */
|
|
sleep(1);
|
|
}
|
|
}
|
|
|
|
pthread_exit(0);
|
|
}
|