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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

 * 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 "u_compiler.h"

/*

 * 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  /* POSIX threads headers */

struct u_tsd {

   pthread_key_t key;

   int initMagic;

};

typedef pthread_mutex_t u_mutex;

#define u_mutex_declare_static(name) \

   static u_mutex name = PTHREAD_MUTEX_INITIALIZER

#define u_mutex_init(name)    pthread_mutex_init(&(name), NULL)

#define u_mutex_destroy(name) pthread_mutex_destroy(&(name))

#define u_mutex_lock(name)    (void) pthread_mutex_lock(&(name))

#define u_mutex_unlock(name)  (void) pthread_mutex_unlock(&(name))

#endif /* PTHREADS */

/*

 * Windows threads. Should work with Windows NT and 95.

 * IMPORTANT: Link with multithreaded runtime library when THREADS are

 * used!

 */

#undef WIN32

#ifdef WIN32

#include 

struct u_tsd {

   DWORD key;

   int   initMagic;

};

typedef CRITICAL_SECTION u_mutex;

/* http://locklessinc.com/articles/pthreads_on_windows/ */

#define u_mutex_declare_static(name) \

   /* static */ u_mutex name = {(void*)-1, -1, 0, 0, 0, 0}

#define u_mutex_init(name)    InitializeCriticalSection(&name)

#define u_mutex_destroy(name) DeleteCriticalSection(&name)

#define u_mutex_lock(name)    EnterCriticalSection(&name)

#define u_mutex_unlock(name)  LeaveCriticalSection(&name)

#endif /* WIN32 */

/*

 * BeOS threads. R5.x required.

 */

#ifdef BEOS_THREADS

/* Problem with OS.h and this file on haiku */

#ifndef __HAIKU__

#include 

#endif

#include 

/* The only two typedefs required here

 * this is cause of the OS.h problem

 */

#ifdef __HAIKU__

typedef int32 thread_id;

typedef int32 sem_id;

#endif

struct u_tsd {

   int32        key;

   int          initMagic;

};

/* Use Benaphore, aka speeder semaphore */

typedef struct {

    int32   lock;

    sem_id  sem;

} benaphore;

typedef benaphore u_mutex;

#define u_mutex_declare_static(name) \

   static u_mutex name = { 0, 0 }

#define u_mutex_init(name) \

   name.sem = create_sem(0, #name"_benaphore"), \

   name.lock = 0

#define u_mutex_destroy(name) \

   delete_sem(name.sem), \

   name.lock = 0

#define u_mutex_lock(name) \

   if (name.sem == 0) \

      u_mutex_init(name); \

   if (atomic_add(&(name.lock), 1) >= 1) \

      acquire_sem(name.sem)

#define u_mutex_unlock(name) \

   if (atomic_add(&(name.lock), -1) > 1) \

      release_sem(name.sem)

#endif /* BEOS_THREADS */

/*

 * THREADS not defined

 */

#ifndef THREADS

struct u_tsd {

   int initMagic;

};

typedef unsigned u_mutex;

#define u_mutex_declare_static(name)   static u_mutex name = 0

#define u_mutex_init(name)             (void) name

#define u_mutex_destroy(name)          (void) name

#define u_mutex_lock(name)             (void) name

#define u_mutex_unlock(name)           (void) name

#endif /* THREADS */

unsigned long

u_thread_self(void);

void

u_tsd_init(struct u_tsd *tsd);

void

u_tsd_destroy(struct u_tsd *tsd); /* WIN32 only */

void *

u_tsd_get(struct u_tsd *tsd);

void

u_tsd_set(struct u_tsd *tsd, void *ptr);

#endif /* _U_THREAD_H_ */