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mthreads.h
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1999-02-04
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/* $Id: mthreads.h,v 1.2 1998/02/04 08:53:44 poliwoda Exp poliwoda $ */
/*
* Mesa 3-D graphics library
* Version: 2.6
* Copyright (C) 1995-1998 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* mthreads.h -- platform dependent thread support for Mesa
*
* $Log$
*
* Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
* and Christoph Poliwoda (poliwoda@volumegraphics.com)
*/
/*
* 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.
*/
#ifdef THREADS
/*
* It is an error not to select a specific threads API when compiling.
*/
#if !defined PTHREADS && !defined SOLARIS_THREADS && !defined WIN32
#error One of PTHREADS, SOLARIS_THREADS or WIN32 must be defined.
#endif
/*
* Error messages which should be printed when our Mesa thread APIs fail
* for one reason or another.
*/
#define MESA_INIT_TSD_ERROR "Mesa: thread failed to allocate key for thread specific data"
#define MESA_GET_TSD_ERROR "Mesa: thread failed to get thread specific data"
#define MESA_SET_TSD_ERROR "Mesa: thread failed to set thread specific data"
/*
* magic number for win32 and solaris threads equivalents of pthread_once
* This could probably be done better, but we haven't figured out how yet.
*/
#define INITFUNC_CALLED_MAGIC 0xff8adc98
/*
* POSIX threads. This should be your choice in the Unix world
* whenever possible. When building with POSIX threads, be sure
* to any able 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.
*/
#ifdef PTHREADS
#include <pthread.h> /* POSIX threads headers */
typedef struct {
pthread_key_t key;
pthread_once_t once;
} MesaTSD;
typedef pthread_mutex_t MesaMutex;
typedef pthread_t MesaThread;
#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.
*/
#ifdef SOLARIS_THREADS
#include <thread.h>
typedef struct {
thread_key_t key;
mutex_t keylock;
int initfuncCalled;
} MesaTSD;
typedef mutex_t MesaMutex;
typedef thread_t MesaThread;
#endif /* SOLARIS_THREADS */
/*
* Windows threads. Should work with Windows NT and 95.
* IMPORTANT: Link with multithreaded runtime library when THREADS are
* used!
*/
#ifdef WIN32
#include <windows.h>
typedef struct {
DWORD key;
int initfuncCalled;
} MesaTSD;
typedef CRITICAL_SECTION MesaMutex;
typedef HANDLE MesaThread;
#endif /* WIN32 */
/*
* Platform independent thread specific data API.
*/
void MesaInitTSD(MesaTSD *);
void* MesaGetTSD (MesaTSD *);
void MesaSetTSD (MesaTSD *, void *, void (*initfunc)(void));
/*
* The following APIs are preliminary. They may be needed in
* future versions of Mesa.
*/
#if 0
/*
* Platform independent mutual exclusion lock API.
*/
void MesaInitMutex (MesaMutex *);
void MesaDestroyMutex (MesaMutex *);
void MesaLockMutex (MesaMutex *);
void MesaUnlockMutex (MesaMutex *);
/*
* Platform independent thread management API.
*/
MesaThread MesaCreateThread ((void*)(*)(void*), void*);
void MesaJoinThread (MesaThread);
#endif
#endif /* THREADS */