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#include <pthread.h> /* NULL, pthread_{key,once,{get,set}specific} */
#include <stdlib.h> /* malloc, free */
#include "internal.h"
struct dtor_node {
struct dtor_node *next;
void (*func)(void *);
void *obj;
};
static pthread_key_t key;
static pthread_once_t once = PTHREAD_ONCE_INIT;
static void run_dtors(void *head)
{
struct dtor_node *next, *node = head;
while (node != NULL) {
next = node->next;
node->func(node->obj);
free(node);
node = next;
}
}
static void create_key(void)
{
int res = pthread_key_create(&key, run_dtors);
GCOMPAT__assert_with_reason(res, "No key for thread_atexit list");
}
/**
* Register a destructor to run at thread exit.
*
* See
* https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
*/
int __cxa_thread_atexit_impl(void (*func)(void *), void *obj, void *dso_symbol)
{
struct dtor_node *node;
pthread_once(&once, create_key);
node = malloc(sizeof(*node));
GCOMPAT__assert_with_reason(node, "No memory for thread_atexit node");
node->next = pthread_getspecific(key);
node->func = func;
node->obj = obj;
int res = pthread_setspecific(key, node);
GCOMPAT__assert_with_reason(!res, "Cannot update thread_atexit list");
return 0;
}
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