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/* $Id: glthread.c,v 1.1 2003-02-28 11:42:02 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.1

 *

 * Copyright (C) 1999-2002  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.

 */

#include "glheader.h"

#include "glthread.h"

/*

 * 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 != (int) INIT_MAGIC) {

      _glthread_InitTSD(tsd);

   }

   return pthread_getspecific(tsd->key);

}

void

_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)

{

   if (tsd->initMagic != (int) 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_THREADS

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_THREADS */

/*

 * 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 */

/*

 * BeOS threads

 */

#ifdef BEOS_THREADS

unsigned long

_glthread_GetID(void)

{

   return (unsigned long) find_thread(NULL);

}

void

_glthread_InitTSD(_glthread_TSD *tsd)

{

   tsd->key = tls_allocate();

   tsd->initMagic = INIT_MAGIC;

}

void *

_glthread_GetTSD(_glthread_TSD *tsd)

{

   if (tsd->initMagic != (int) INIT_MAGIC) {

      _glthread_InitTSD(tsd);

   }

   return tls_get(tsd->key);

}

void

_glthread_SetTSD(_glthread_TSD *tsd, void *ptr)

{

   if (tsd->initMagic != (int) INIT_MAGIC) {

      _glthread_InitTSD(tsd);

   }

   tls_set(tsd->key, ptr);

}

#endif /* BEOS_THREADS */

#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 */