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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* 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.
*/
/*
* Thread support for gl dispatch.
*
* Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
* and Christoph Poliwoda (poliwoda@volumegraphics.com)
* Revised by Keith Whitwell
* Adapted for new gl dispatcher by Brian Paul
* Modified for use in mapi by Chia-I Wu
*/
/*
* If this file is accidentally included by a non-threaded build,
* it should not cause the build to fail, or otherwise cause problems.
* In general, it should only be included when needed however.
*/
#ifndef _U_THREAD_H_
#define _U_THREAD_H_
#include <stdio.h>
#include <stdlib.h>
#include "u_compiler.h"
#include "c11/threads.h"
#if defined(HAVE_PTHREAD) || defined(_WIN32)
#ifndef THREADS
#define THREADS
#endif
#endif
/*
* Error messages
*/
#define INIT_TSD_ERROR "Mesa: failed to allocate key for thread specific data"
#define GET_TSD_ERROR "Mesa: failed to get thread specific data"
#define SET_TSD_ERROR "Mesa: thread failed to set thread specific data"
/*
* Magic number to determine if a TSD object has been initialized.
* Kind of a hack but there doesn't appear to be a better cross-platform
* solution.
*/
#define INIT_MAGIC 0xff8adc98
#ifdef __cplusplus
extern "C" {
#endif
struct u_tsd {
tss_t key;
unsigned initMagic;
};
static inline unsigned long
u_thread_self(void)
{
/*
* XXX: Callers of u_thread_self assume it is a lightweight function,
* returning a numeric value. But unfortunately C11's thrd_current() gives
* no such guarantees. In fact, it's pretty hard to have a compliant
* implementation of thrd_current() on Windows with such characteristics.
* So for now, we side-step this mess and use Windows thread primitives
* directly here.
*
* FIXME: On the other hand, u_thread_self() is a bad
* abstraction. Even with pthreads, there is no guarantee that
* pthread_self() will return numeric IDs -- we should be using
* pthread_equal() instead of assuming we can compare thread ids...
*/
#ifdef _WIN32
return GetCurrentThreadId();
#else
return (unsigned long) (uintptr_t) thrd_current();
#endif
}
static inline void
u_tsd_init(struct u_tsd *tsd)
{
if (tss_create(&tsd->key, NULL/*free*/) != 0) {
perror(INIT_TSD_ERROR);
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
static inline void *
u_tsd_get(struct u_tsd *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
u_tsd_init(tsd);
}
return tss_get(tsd->key);
}
static inline void
u_tsd_set(struct u_tsd *tsd, void *ptr)
{
if (tsd->initMagic != INIT_MAGIC) {
u_tsd_init(tsd);
}
if (tss_set(tsd->key, ptr) != 0) {
perror(SET_TSD_ERROR);
exit(-1);
}
}
static inline void
u_tsd_destroy(struct u_tsd *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
return;
}
tss_delete(tsd->key);
tsd->initMagic = 0x0;
}
#ifdef __cplusplus
}
#endif
#endif /* _U_THREAD_H_ */
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