---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: curl_share_cleanup
Section: 3
Source: libcurl
See-also:
  - curl_share_init (3)
  - curl_share_setopt (3)
Protocol:
  - All
Added-in: 7.10
---

# NAME

curl_share_cleanup - close a shared object

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLSHcode curl_share_cleanup(CURLSH *share_handle);
~~~

# DESCRIPTION

This function deletes a shared object. The share handle cannot be used anymore
when this function has been called. The share fails the call if it is
still being used in any easy handle.

Passing in a NULL pointer in *share_handle* makes this function return
immediately with no action.

Any use of the **share_handle** after this function has been called and have
returned, is illegal.

For applications that use a share in several threads, it is critical that
the destruction of the share is only done when all other threads have stopped
using it. While libcurl tracks how many easy handles are using a share,
it can not observe how many pointers to the share the application has.

# %PROTOCOLS%

# EXAMPLE

~~~c
int main(void)
{
  CURLSHcode sh;
  CURLSH *share = curl_share_init();
  sh = curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
  /* use the share, then ... */
  curl_share_cleanup(share);
}
~~~

# %AVAILABILITY%

# RETURN VALUE

CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred as *\<curl/curl.h\>* defines. See the libcurl-errors(3) man
page for the full list with descriptions. If an error occurs, then the share
object is not deleted.