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/*
* Copyright (c) 2011 Collabora Ltd
* Copyright (c) 2012 Stef Walter
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*
* CONTRIBUTORS
* Stef Walter <stef@thewalter.net>
*/
#include "config.h"
#include "compat.h"
#define P11_DEBUG_FLAG P11_DEBUG_LIB
#include "debug.h"
#include "library.h"
#include "message.h"
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define P11_MESSAGE_MAX 512
typedef struct {
char message[P11_MESSAGE_MAX];
} p11_local;
static p11_local * _p11_library_get_thread_local (void);
p11_mutex_t p11_library_mutex;
#ifdef OS_UNIX
pthread_once_t p11_library_once = PTHREAD_ONCE_INIT;
#endif
unsigned int p11_forkid = 1;
static char *
thread_local_message (void)
{
p11_local *local;
local = _p11_library_get_thread_local ();
return local ? local->message : NULL;
}
static char *
dont_store_message (void)
{
return NULL;
}
static void
uninit_common (void)
{
p11_debug ("uninitializing library");
}
#ifdef OS_UNIX
static pthread_key_t thread_local = 0;
static p11_local *
_p11_library_get_thread_local (void)
{
p11_local *local;
p11_library_init_once ();
local = pthread_getspecific (thread_local);
if (local == NULL) {
local = calloc (1, sizeof (p11_local));
pthread_setspecific (thread_local, local);
}
return local;
}
static void
count_forks (void)
{
/* Thread safe, executed in child, one thread exists */
p11_forkid++;
}
void
p11_library_init_impl (void)
{
p11_debug_init ();
p11_debug ("initializing library");
p11_mutex_init (&p11_library_mutex);
pthread_key_create (&thread_local, free);
p11_message_storage = thread_local_message;
pthread_atfork (NULL, NULL, count_forks);
}
void
p11_library_init (void)
{
p11_library_init_once ();
}
void
p11_library_uninit (void)
{
uninit_common ();
/* Some cleanup to pacify valgrind */
free (pthread_getspecific (thread_local));
pthread_setspecific (thread_local, NULL);
p11_message_storage = dont_store_message;
pthread_key_delete (thread_local);
p11_mutex_uninit (&p11_library_mutex);
}
#endif /* OS_UNIX */
#ifdef OS_WIN32
static DWORD thread_local = TLS_OUT_OF_INDEXES;
BOOL WINAPI DllMain (HINSTANCE, DWORD, LPVOID);
static p11_local *
_p11_library_get_thread_local (void)
{
LPVOID data;
if (thread_local == TLS_OUT_OF_INDEXES)
return NULL;
data = TlsGetValue (thread_local);
if (data == NULL) {
data = LocalAlloc (LPTR, sizeof (p11_local));
TlsSetValue (thread_local, data);
}
return (p11_local *)data;
}
void
p11_library_init (void)
{
p11_debug_init ();
p11_debug ("initializing library");
p11_mutex_init (&p11_library_mutex);
thread_local = TlsAlloc ();
if (thread_local == TLS_OUT_OF_INDEXES)
p11_debug ("couldn't setup tls");
else
p11_message_storage = thread_local_message;
}
void
p11_library_thread_cleanup (void)
{
p11_local *local;
if (thread_local != TLS_OUT_OF_INDEXES) {
p11_debug ("thread stopped, freeing tls");
local = TlsGetValue (thread_local);
LocalFree (local);
}
}
void
p11_library_uninit (void)
{
LPVOID data;
uninit_common ();
if (thread_local != TLS_OUT_OF_INDEXES) {
p11_message_storage = dont_store_message;
data = TlsGetValue (thread_local);
LocalFree (data);
TlsFree (thread_local);
}
p11_mutex_uninit (&p11_library_mutex);
}
#endif /* OS_WIN32 */
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