[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Bug#538646: glibc-doc-reference: Thread specific data(tsd) destructor function not called

Package: glibc-doc-reference
Version: 2.7-1
Severity: normal

I've attached the source to a program that displays this behaviour.

I compiled it with
    gcc -pthread -D_REENTRANT -o tls_test tls_test.c

Either the documentation is wrong or there's a problem with glibc.

The tsd dectructor function isn't being called.

There's a second related problem in that the unfortunate softare
developer may sometimes be forced to choose between leaking a tsd
key or any number (including 0) of tsd data items.

I guess if the destructor function isn't called then that
simplifies this second choice.

-- System Information:
Debian Release: 5.0.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

-- no debconf information
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

void cleanup_fn(void * p)
	char * msg = (char *)p;
	printf("Cleaning up %s.\n", msg);
int main(int argc, char *argv[])
	pthread_key_t key;

	int ret = pthread_key_create(& key, cleanup_fn);
	if(ret) {
		printf("pthread_key_create() failed.\n");
		return 1;
	char * msg = strdup("data");
	if(!msg) {
		printf("strdup(\"data\") failed.\n");
		return 1;
	ret = pthread_setspecific(key, (void *)msg);
	if(ret) {
		printf("pthread_setspecific() failed.\n");
		return 1;
	return 0;

Reply to: