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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/*
* Copyright 2010-2011 Andrea Canciani
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author(s): Andrea Canciani <ranma42@gmail.com>
*/
#ifndef SIMPLEOPS_TLS_IMPL_COMMON_TAIL_H
#define SIMPLEOPS_TLS_IMPL_COMMON_TAIL_H
#ifndef SIMPLEOPS_TLS_IMPL_H
#error Private header used directly
#endif
#include <stdlib.h>
static simpleops_tls_t *_simpleops_tls_create (void);
static void _simpleops_tls_destroy (void *tls);
#define _SIMPLEOPS_TLS_INITIALIZED SIMPLEOPS_ADD_PREFIX (_simpleops_tls_initialized)
extern simpleops_bool_t _SIMPLEOPS_TLS_INITIALIZED;
/**
* Get the pointer to the thread-local storage.
*
* \return the pointer to the TLS. If the TLS cannot be initialized,
* NULL is returned instead.
*/
static simpleops_tls_t *
simpleops_tls_get (void)
{
simpleops_tls_t *tls;
if (SIMPLEOPS_UNLIKELY (! _SIMPLEOPS_TLS_INITIALIZED))
return NULL;
tls = _simpleops_tls_get ();
if (SIMPLEOPS_UNLIKELY (tls == NULL)) {
tls = _simpleops_tls_create ();
if (SIMPLEOPS_UNLIKELY (tls == NULL))
return NULL;
if (SIMPLEOPS_UNLIKELY (_simpleops_tls_set (tls))) {
_simpleops_tls_destroy (tls);
return NULL;
}
}
return tls;
}
/**
* Reset the thread-local storage.
*
* Destroy the current content of the TLS and reset it to the state
* preceding the first simpleops_tls_get() call.
*/
static void
simpleops_tls_reset (void)
{
simpleops_tls_t *tls;
if (SIMPLEOPS_UNLIKELY (! _SIMPLEOPS_TLS_INITIALIZED))
return;
tls = _simpleops_tls_get ();
if (SIMPLEOPS_UNLIKELY (tls == NULL))
return;
if (SIMPLEOPS_UNLIKELY (_simpleops_tls_set (NULL)))
return;
_simpleops_tls_destroy (tls);
}
static simpleops_always_inline void
_simpleops_tls_silence_unused_warnings (void)
{
if (simpleops_tls_get () != NULL)
simpleops_tls_reset ();
}
/**
* This macro is used to specify what function should be used to
* instantiate and initialize the thread-local storage, when needed.
*
* This macro should be invoked as a declaration of a function. The
* invocation must be visible to all the places where the TLS
* functions are called.
*/
#define SIMPLEOPS_TLS_CREATE(f) \
static simpleops_tls_t *_simpleops_tls_create (void) \
{ \
return f (); \
}
/**
* This macro is used to specify what function should be used to
* destroy the content of the thread-local storage, when needed.
*
* This macro should be invoked as a declaration of a function. The
* invocation must be visible to all the places where the TLS
* functions are called.
*/
#define SIMPLEOPS_TLS_DESTROY(f) \
static void _simpleops_tls_destroy (void *tls) \
{ \
f ((simpleops_tls_t *) tls); \
}
/**
* This macro provides a default implementation for TLS allocation.
*
* The create function performs dynamic allocation and initializes
* the content of the simpleops_tls_t structure to 0 (i.e. it is a
* calloc()).
*
* The destroy function free()s the data.
*/
#define SIMPLEOPS_TLS_DEFAULT_ALLOCATOR \
static simpleops_tls_t * \
_simpleops_tls_create (void) \
{ \
return calloc (1, sizeof (simpleops_tls_t)); \
} \
\
static void \
_simpleops_tls_destroy (void *tls) \
{ \
free (tls); \
}
#endif
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