.\" generated by cd2nroff 0.1 from CURLSHOPT_UNLOCKFUNC.md
.TH CURLSHOPT_UNLOCKFUNC 3 "2024-11-18" libcurl
.SH NAME
CURLSHOPT_UNLOCKFUNC \- mutex unlock callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>

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

CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_UNLOCKFUNC, unlockcb);
.fi
.SH DESCRIPTION
Set a mutex unlock callback for the share object. There is a corresponding
\fICURLSHOPT_LOCKFUNC(3)\fP callback called when the mutex is first locked.

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

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

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

\fIclientp\fP is the private pointer you set with \fICURLSHOPT_USERDATA(3)\fP.
This pointer is not used by libcurl itself.
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
extern void mutex_unlock(CURL *, curl_lock_data, void *);

int main(void)
{
  CURLSHcode sh;
  CURLSH *share = curl_share_init();
  sh = curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, mutex_unlock);
  if(sh)
    printf("Error: %s\\n", curl_share_strerror(sh));
}
.fi
.SH AVAILABILITY
Added in curl 7.10.3
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non\-zero means an
error occurred. See \fIlibcurl\-errors(3)\fP for the full list with
descriptions.
.SH SEE ALSO
.BR CURLSHOPT_LOCKFUNC (3),
.BR curl_share_cleanup (3),
.BR curl_share_init (3),
.BR curl_share_setopt (3)