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/*
* Mesa 3-D graphics library
* Version: 6.5.2
*
* 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
* 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.
*/
/*
* 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
*
*
*
* DOCUMENTATION
*
* This thread module exports the following types:
* _glthread_TSD Thread-specific data area
* _glthread_Thread Thread datatype
* _glthread_Mutex Mutual exclusion lock
*
* Macros:
* _glthread_DECLARE_STATIC_MUTEX(name) Declare a non-local mutex
* _glthread_INIT_MUTEX(name) Initialize a mutex
* _glthread_LOCK_MUTEX(name) Lock a mutex
* _glthread_UNLOCK_MUTEX(name) Unlock a mutex
*
* Functions:
* _glthread_GetID(v) Get integer thread ID
* _glthread_InitTSD() Initialize thread-specific data
* _glthread_GetTSD() Get thread-specific data
* _glthread_SetTSD() Set thread-specific data
*
*/
/*
* 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 GLTHREAD_H
#define GLTHREAD_H
#if defined(USE_MGL_NAMESPACE)
#define _glapi_Dispatch _mglapi_Dispatch
#endif
#if (defined(PTHREADS) || defined(WIN32_THREADS)) \
&& !defined(THREADS)
# define THREADS
#endif
#ifdef VMS
#include <GL/vms_x_fix.h>
#endif
/*
* POSIX threads. This should be your choice in the Unix world
* whenever possible. When building with POSIX threads, be sure
* to enable any compiler flags which will cause the MT-safe
* libc (if one exists) to be used when linking, as well as any
* header macros for MT-safe errno, etc. For Solaris, this is the -mt
* compiler flag. On Solaris with gcc, use -D_REENTRANT to enable
* proper compiling for MT-safe libc etc.
*/
#if defined(PTHREADS)
#include <pthread.h> /* POSIX threads headers */
typedef struct {
pthread_key_t key;
int initMagic;
} _glthread_TSD;
typedef pthread_t _glthread_Thread;
typedef pthread_mutex_t _glthread_Mutex;
#define _glthread_DECLARE_STATIC_MUTEX(name) \
static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER
#define _glthread_INIT_MUTEX(name) \
pthread_mutex_init(&(name), NULL)
#define _glthread_DESTROY_MUTEX(name) \
pthread_mutex_destroy(&(name))
#define _glthread_LOCK_MUTEX(name) \
(void) pthread_mutex_lock(&(name))
#define _glthread_UNLOCK_MUTEX(name) \
(void) pthread_mutex_unlock(&(name))
#endif /* PTHREADS */
/*
* Solaris threads. Use only up to Solaris 2.4.
* Solaris 2.5 and higher provide POSIX threads.
* Be sure to compile with -mt on the Solaris compilers, or
* use -D_REENTRANT if using gcc.
*/
/*
* Windows threads. Should work with Windows NT and 95.
* IMPORTANT: Link with multithreaded runtime library when THREADS are
* used!
*/
#ifdef WIN32_THREADS
#include <windows.h>
typedef struct {
DWORD key;
int initMagic;
} _glthread_TSD;
typedef HANDLE _glthread_Thread;
typedef CRITICAL_SECTION _glthread_Mutex;
#define _glthread_DECLARE_STATIC_MUTEX(name) /*static*/ _glthread_Mutex name = {0,0,0,0,0,0}
#define _glthread_INIT_MUTEX(name) InitializeCriticalSection(&name)
#define _glthread_DESTROY_MUTEX(name) DeleteCriticalSection(&name)
#define _glthread_LOCK_MUTEX(name) EnterCriticalSection(&name)
#define _glthread_UNLOCK_MUTEX(name) LeaveCriticalSection(&name)
#endif /* WIN32_THREADS */
/*
* BeOS threads. R5.x required.
*/
#ifdef BEOS_THREADS
#include <kernel/OS.h>
#include <support/TLS.h>
typedef struct {
int32 key;
int initMagic;
} _glthread_TSD;
typedef thread_id _glthread_Thread;
/* Use Benaphore, aka speeder semaphore */
typedef struct {
int32 lock;
sem_id sem;
} benaphore;
typedef benaphore _glthread_Mutex;
#define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = { 0, 0 }
#define _glthread_INIT_MUTEX(name) name.sem = create_sem(0, #name"_benaphore"), name.lock = 0
#define _glthread_DESTROY_MUTEX(name) delete_sem(name.sem), name.lock = 0
#define _glthread_LOCK_MUTEX(name) if (name.sem == 0) _glthread_INIT_MUTEX(name); \
if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem)
#define _glthread_UNLOCK_MUTEX(name) if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem)
#endif /* BEOS_THREADS */
#ifndef THREADS
/*
* THREADS not defined
*/
typedef int _glthread_TSD;
typedef int _glthread_Thread;
typedef int _glthread_Mutex;
#define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
#define _glthread_INIT_MUTEX(name) (void) name
#define _glthread_DESTROY_MUTEX(name) (void) name
#define _glthread_LOCK_MUTEX(name) (void) name
#define _glthread_UNLOCK_MUTEX(name) (void) name
#endif /* THREADS */
/*
* Platform independent thread specific data API.
*/
extern unsigned long
_glthread_GetID(void);
extern void
_glthread_InitTSD(_glthread_TSD *);
extern void *
_glthread_GetTSD(_glthread_TSD *);
extern void
_glthread_SetTSD(_glthread_TSD *, void *);
#if defined(GLX_USE_TLS)
extern TLS struct _glapi_table * _glapi_tls_Dispatch;
#define GET_DISPATCH() _glapi_tls_Dispatch
#elif !defined(GL_CALL)
# if defined(THREADS)
# define GET_DISPATCH() \
((__builtin_expect( _glapi_Dispatch != NULL, 1 )) \
? _glapi_Dispatch : _glapi_get_dispatch())
# else
# define GET_DISPATCH() _glapi_Dispatch
# endif /* defined(THREADS) */
#endif /* ndef GL_CALL */
#endif /* THREADS_H */
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