CURLSHOPT_UNLOCKFUNC - Man Page

mutex unlock callback

Synopsis

#include <curl/curl.h>

void unlockcb(CURL *handle, curl_lock_data data, void *userptr);

CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_UNLOCKFUNC, unlockcb);

Description

Set a mutex unlock callback for the share object. There's a corresponding CURLSHOPT_LOCKFUNC(3) callback called when the mutex is first locked.

The unlockcb argument must be a pointer to a function matching the prototype shown above. The arguments to the callback are:

handle is the currently active easy handle in use when the share object is released.

The data argument tells what kind of data libcurl wants to unlock. Make sure that the callback uses a different lock for each kind of data.

access defines what access type libcurl wants, shared or single.

userptr is the private pointer you set with CURLSHOPT_USERDATA. This pointer is not used by libcurl itself.

Protocols

All

Example

  CURLSHcode sh;
  share = curl_share_init();
  sh = curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, mutex_unlock);
  if(sh)
    printf("Error: %s\n", curl_share_strerror(sh));

Availability

Added in 7.10

Return Value

CURLSHE_OK (zero) means that the option was set properly, non-zero means an error occurred. See libcurl-errors(3) for the full list with descriptions.

See Also

CURLSHOPT_LOCKFUNC(3), curl_share_setopt(3), curl_share_cleanup(3), curl_share_init(3)

Referenced By

curl_share_setopt(3), CURLSHOPT_LOCKFUNC(3), CURLSHOPT_USERDATA(3).

May 17, 2022 libcurl 7.85.0 libcurl Manual