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/* $Id: glthread.c,v 1.5 2000/02/10 21:54:06 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
*
* Copyright (C) 1999-2000 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
* BRIAN PAUL 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.
*/
/*
* XXX There's probably some work to do in order to make this file
* truly reusable outside of Mesa. First, the glheader.h include must go.
*/
#ifdef PC_ALL
#include "all.h"
#else
#include "glheader.h"
#include "glthread.h"
#endif
/*
* This file should still compile even when THREADS is not defined.
* This is to make things easier to deal with on the makefile scene..
*/
#ifdef THREADS
#include <errno.h>
/*
* Error messages
*/
#define INIT_TSD_ERROR "_glthread_: failed to allocate key for thread specific data"
#define GET_TSD_ERROR "_glthread_: failed to get thread specific data"
#define SET_TSD_ERROR "_glthread_: 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
/*
* POSIX Threads -- The best way to go if your platform supports them.
* Solaris >= 2.5 have POSIX threads, IRIX >= 6.4 reportedly
* has them, and many of the free Unixes now have them.
* Be sure to use appropriate -mt or -D_REENTRANT type
* compile flags when building.
*/
#ifdef PTHREADS
unsigned long
_glthread_GetID(void)
{
return (unsigned long) pthread_self();
}
void
_glthread_InitTSD(_glthread_TSD *tsd)
{
if (pthread_key_create(&tsd->key, NULL/*free*/) != 0) {
perror(INIT_TSD_ERROR);
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
void *
_glthread_GetTSD(_glthread_TSD *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
return pthread_getspecific(tsd->key);
}
void
_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
{
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
if (pthread_setspecific(tsd->key, ptr) != 0) {
perror(SET_TSD_ERROR);
exit(-1);
}
}
#endif /* PTHREADS */
/*
* Solaris/Unix International Threads -- Use only if POSIX threads
* aren't available on your Unix platform. Solaris 2.[34] are examples
* of platforms where this is the case. Be sure to use -mt and/or
* -D_REENTRANT when compiling.
*/
#ifdef SOLARIS_THREADS
#define USE_LOCK_FOR_KEY /* undef this to try a version without
lock for the global key... */
unsigned long
_glthread_GetID(void)
{
abort(); /* XXX not implemented yet */
return (unsigned long) 0;
}
void
_glthread_InitTSD(_glthread_TSD *tsd)
{
if ((errno = mutex_init(&tsd->keylock, 0, NULL)) != 0 ||
(errno = thr_keycreate(&(tsd->key), free)) != 0) {
perror(INIT_TSD_ERROR);
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
void *
_glthread_GetTSD(_glthread_TSD *tsd)
{
void* ret;
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
#ifdef USE_LOCK_FOR_KEY
mutex_lock(&tsd->keylock);
thr_getspecific(tsd->key, &ret);
mutex_unlock(&tsd->keylock);
#else
if ((errno = thr_getspecific(tsd->key, &ret)) != 0) {
perror(GET_TSD_ERROR);
exit(-1);
}
#endif
return ret;
}
void
_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
{
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
if ((errno = thr_setspecific(tsd->key, ptr)) != 0) {
perror(SET_TSD_ERROR);
exit(-1);
}
}
#undef USE_LOCK_FOR_KEY
#endif /* SOLARIS_THREADS */
/*
* Win32 Threads. The only available option for Windows 95/NT.
* Be sure that you compile using the Multithreaded runtime, otherwise
* bad things will happen.
*/
#ifdef WIN32
unsigned long
_glthread_GetID(void)
{
abort(); /* XXX not implemented yet */
return (unsigned long) 0;
}
void
_glthread_InitTSD(_glthread_TSD *tsd)
{
tsd->key = TlsAlloc();
if (tsd->key == 0xffffffff) {
/* Can Windows handle stderr messages for non-console
applications? Does Windows have perror? */
/* perror(SET_INIT_ERROR);*/
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
void *
_glthread_GetTSD(_glthread_TSD *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
return TlsGetValue(tsd->key);
}
void
_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
{
/* the following code assumes that the _glthread_TSD has been initialized
to zero at creation */
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
if (TlsSetValue(tsd->key, ptr) == 0) {
/* Can Windows handle stderr messages for non-console
applications? Does Windows have perror? */
/* perror(SET_TSD_ERROR);*/
exit(-1);
}
}
#endif /* WIN32 */
/*
* XFree86 has its own thread wrapper, Xthreads.h
* We wrap it again for GL.
*/
#ifdef XTHREADS
unsigned long
_glthread_GetID(void)
{
return (unsigned long) xthread_self();
}
void
_glthread_InitTSD(_glthread_TSD *tsd)
{
if (xthread_key_create(&tsd->key, NULL) != 0) {
perror(INIT_TSD_ERROR);
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
void *
_glthread_GetTSD(_glthread_TSD *tsd)
{
void *ptr;
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
xthread_get_specific(tsd->key, &ptr);
return ptr;
}
void
_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
{
if (tsd->initMagic != INIT_MAGIC) {
_glthread_InitTSD(tsd);
}
xthread_set_specific(tsd->key, ptr);
}
#endif /* XTHREAD */
#else /* THREADS */
/*
* no-op functions
*/
unsigned long
_glthread_GetID(void)
{
return 0;
}
void
_glthread_InitTSD(_glthread_TSD *tsd)
{
(void) tsd;
}
void *
_glthread_GetTSD(_glthread_TSD *tsd)
{
(void) tsd;
return NULL;
}
void
_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
{
(void) tsd;
(void) ptr;
}
#endif /* THREADS */
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