/*
===========================================================================

Return to Castle Wolfenstein single player GPL Source Code
Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company. 

This file is part of the Return to Castle Wolfenstein single player GPL Source Code (“RTCW SP Source Code”).  

RTCW SP Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

RTCW SP Source Code 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with RTCW SP Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the RTCW SP Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the RTCW SP Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

//===========================================================================
//
// Name:				l_threads.c
// Function:		multi-threading
// Programmer:		Mr Elusive (MrElusive@demigod.demon.nl)
// Last update:	1999-05-14
// Tab Size:		3
//===========================================================================

#include "l_cmd.h"
#include "l_threads.h"
#include "l_log.h"
#include "l_mem.h"

#define MAX_THREADS 64

//#define THREAD_DEBUG

int dispatch;
int workcount;
int oldf;
qboolean pacifier;
qboolean threaded;
void ( *workfunction )( int );

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetThreadWork( void ) {
	int r;
	int f;

	ThreadLock();

	if ( dispatch == workcount ) {
		ThreadUnlock();
		return -1;
	}

	f = 10 * dispatch / workcount;
	if ( f != oldf ) {
		oldf = f;
		if ( pacifier ) {
			printf( "%i...", f );
		}
	} //end if

	r = dispatch;
	dispatch++;
	ThreadUnlock();

	return r;
} //end of the function GetThreadWork
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadWorkerFunction( int threadnum ) {
	int work;

	while ( 1 )
	{
		work = GetThreadWork();
		if ( work == -1 ) {
			break;
		}
//printf ("thread %i, work %i\n", threadnum, work);
		workfunction( work );
	} //end while
} //end of the function ThreadWorkerFunction
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOnIndividual( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	if ( numthreads == -1 ) {
		ThreadSetDefault();
	}
	workfunction = func;
	RunThreadsOn( workcnt, showpacifier, ThreadWorkerFunction );
} //end of the function RunThreadsOnIndividual


//===================================================================
//
// WIN32
//
//===================================================================

#if defined( WIN32 ) || defined( _WIN32 )

#define USED

#include <windows.h>

typedef struct thread_s
{
	HANDLE handle;
	int threadid;
	int id;
	struct thread_s *next;
} thread_t;

thread_t *firstthread;
thread_t *lastthread;
int currentnumthreads;
int currentthreadid;

int numthreads = 1;
CRITICAL_SECTION crit;
HANDLE semaphore;
static int enter;
static int numwaitingthreads = 0;

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetDefault( void ) {
	SYSTEM_INFO info;

	if ( numthreads == -1 ) { // not set manually
		GetSystemInfo( &info );
		numthreads = info.dwNumberOfProcessors;
		if ( numthreads < 1 || numthreads > 32 ) {
			numthreads = 1;
		}
	} //end if
	qprintf( "%i threads\n", numthreads );
} //end of the function ThreadSetDefault
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadLock( void ) {
	if ( !threaded ) {
		Error( "ThreadLock: !threaded" );
		return;
	} //end if
	EnterCriticalSection( &crit );
	if ( enter ) {
		Error( "Recursive ThreadLock\n" );
	}
	enter = 1;
} //end of the function ThreadLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadUnlock( void ) {
	if ( !threaded ) {
		Error( "ThreadUnlock: !threaded" );
		return;
	} //end if
	if ( !enter ) {
		Error( "ThreadUnlock without lock\n" );
	}
	enter = 0;
	LeaveCriticalSection( &crit );
} //end of the function ThreadUnlock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupLock( void ) {
	Log_Print( "Win32 multi-threading\n" );
	InitializeCriticalSection( &crit );
	threaded = true;    //Stupid me... forgot this!!!
	currentnumthreads = 0;
	currentthreadid = 0;
} //end of the function ThreadInitLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownLock( void ) {
	DeleteCriticalSection( &crit );
	threaded = false;   //Stupid me... forgot this!!!
} //end of the function ThreadShutdownLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupSemaphore( void ) {
	semaphore = CreateSemaphore( NULL, 0, 99999999, "bspc" );
} //end of the function ThreadSetupSemaphore
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownSemaphore( void ) {
} //end of the function ThreadShutdownSemaphore
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreWait( void ) {
	WaitForSingleObject( semaphore, INFINITE );
} //end of the function ThreadSemaphoreWait
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreIncrease( int count ) {
	ReleaseSemaphore( semaphore, count, NULL );
} //end of the function ThreadSemaphoreIncrease
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOn( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	int threadid[MAX_THREADS];
	HANDLE threadhandle[MAX_THREADS];
	int i;
	int start, end;

	Log_Print( "Win32 multi-threading\n" );
	start = I_FloatTime();
	dispatch = 0;
	workcount = workcnt;
	oldf = -1;
	pacifier = showpacifier;
	threaded = true;

	if ( numthreads == -1 ) {
		ThreadSetDefault();
	}

	if ( numthreads < 1 || numthreads > MAX_THREADS ) {
		numthreads = 1;
	}
	//
	// run threads in parallel
	//
	InitializeCriticalSection( &crit );

	numwaitingthreads = 0;

	if ( numthreads == 1 ) { // use same thread
		func( 0 );
	} //end if
	else
	{
//		printf("starting %d threads\n", numthreads);
		for ( i = 0; i < numthreads; i++ )
		{
			threadhandle[i] = CreateThread(
				NULL,   // LPSECURITY_ATTRIBUTES lpsa,
				0,      // DWORD cbStack,
				(LPTHREAD_START_ROUTINE)func,   // LPTHREAD_START_ROUTINE lpStartAddr,
				(LPVOID)i,  // LPVOID lpvThreadParm,
				0,          //   DWORD fdwCreate,
				&threadid[i] );
//			printf("started thread %d\n", i);
		} //end for

		for ( i = 0; i < numthreads; i++ )
			WaitForSingleObject( threadhandle[i], INFINITE );
	} //end else
	DeleteCriticalSection( &crit );

	threaded = false;
	end = I_FloatTime();
	if ( pacifier ) {
		printf( " (%i)\n", end - start );
	}
} //end of the function RunThreadsOn
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AddThread( void ( *func )(int) ) {
	thread_t *thread;

	if ( numthreads == 1 ) {
		if ( currentnumthreads >= numthreads ) {
			return;
		}
		currentnumthreads++;
		func( -1 );
		currentnumthreads--;
	} //end if
	else
	{
		ThreadLock();
		if ( currentnumthreads >= numthreads ) {
			ThreadUnlock();
			return;
		} //end if
		  //allocate new thread
		thread = GetMemory( sizeof( thread_t ) );
		if ( !thread ) {
			Error( "can't allocate memory for thread\n" );
		}

		//
		thread->threadid = currentthreadid;
		thread->handle = CreateThread(
			NULL,           // LPSECURITY_ATTRIBUTES lpsa,
			0,              // DWORD cbStack,
			(LPTHREAD_START_ROUTINE)func,           // LPTHREAD_START_ROUTINE lpStartAddr,
			(LPVOID) thread->threadid,                  // LPVOID lpvThreadParm,
			0,                              // DWORD fdwCreate,
			&thread->id );

		//add the thread to the end of the list
		thread->next = NULL;
		if ( lastthread ) {
			lastthread->next = thread;
		} else { firstthread = thread;}
		lastthread = thread;
		//
#ifdef THREAD_DEBUG
		qprintf( "added thread with id %d\n", thread->threadid );
#endif //THREAD_DEBUG
	   //
		currentnumthreads++;
		currentthreadid++;
		//
		ThreadUnlock();
	} //end else
} //end of the function AddThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RemoveThread( int threadid ) {
	thread_t *thread, *last;

	//if a single thread
	if ( threadid == -1 ) {
		return;
	}
	//
	ThreadLock();
	last = NULL;
	for ( thread = firstthread; thread; thread = thread->next )
	{
		if ( thread->threadid == threadid ) {
			if ( last ) {
				last->next = thread->next;
			} else { firstthread = thread->next;}
			if ( !thread->next ) {
				lastthread = last;
			}
			//
			FreeMemory( thread );
			currentnumthreads--;
#ifdef THREAD_DEBUG
			qprintf( "removed thread with id %d\n", threadid );
#endif //THREAD_DEBUG
			break;
		} //end if
		last = thread;
	} //end if
	if ( !thread ) {
		Error( "couldn't find thread with id %d", threadid );
	}
	ThreadUnlock();
} //end of the function RemoveThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WaitForAllThreadsFinished( void ) {
	HANDLE handle;

	ThreadLock();
	while ( firstthread )
	{
		handle = firstthread->handle;
		ThreadUnlock();

		WaitForSingleObject( handle, INFINITE );

		ThreadLock();
	} //end while
	ThreadUnlock();
} //end of the function WaitForAllThreadsFinished
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetNumThreads( void ) {
	return currentnumthreads;
} //end of the function GetNumThreads

#endif


//===================================================================
//
// OSF1
//
//===================================================================

#if defined( __osf__ )

#define USED

#include <pthread.h>

typedef struct thread_s
{
	pthread_t thread;
	int threadid;
	int id;
	struct thread_s *next;
} thread_t;

thread_t *firstthread;
thread_t *lastthread;
int currentnumthreads;
int currentthreadid;

int numthreads = 1;
pthread_mutex_t my_mutex;
pthread_attr_t attrib;
static int enter;
static int numwaitingthreads = 0;


//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetDefault( void ) {
	if ( numthreads == -1 ) { // not set manually
		numthreads = 1;
	} //end if
	qprintf( "%i threads\n", numthreads );
} //end of the function ThreadSetDefault
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadLock( void ) {
	if ( !threaded ) {
		Error( "ThreadLock: !threaded" );
		return;
	} //end if
	if ( my_mutex ) {
		pthread_mutex_lock( my_mutex );
	} //end if
	if ( enter ) {
		Error( "Recursive ThreadLock\n" );
	}
	enter = 1;
} //end of the function ThreadLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadUnlock( void ) {
	if ( !threaded ) {
		Error( "ThreadUnlock: !threaded" );
		return;
	} //end if
	if ( !enter ) {
		Error( "ThreadUnlock without lock\n" );
	}
	enter = 0;
	if ( my_mutex ) {
		pthread_mutex_unlock( my_mutex );
	} //end if
} //end of the function ThreadUnlock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupLock( void ) {
	pthread_mutexattr_t mattrib;

	Log_Print( "pthread multi-threading\n" );

	if ( !my_mutex ) {
		my_mutex = GetMemory( sizeof( *my_mutex ) );
		if ( pthread_mutexattr_create( &mattrib ) == -1 ) {
			Error( "pthread_mutex_attr_create failed" );
		}
		if ( pthread_mutexattr_setkind_np( &mattrib, MUTEX_FAST_NP ) == -1 ) {
			Error( "pthread_mutexattr_setkind_np failed" );
		}
		if ( pthread_mutex_init( my_mutex, mattrib ) == -1 ) {
			Error( "pthread_mutex_init failed" );
		}
	}

	if ( pthread_attr_create( &attrib ) == -1 ) {
		Error( "pthread_attr_create failed" );
	}
	if ( pthread_attr_setstacksize( &attrib, 0x100000 ) == -1 ) {
		Error( "pthread_attr_setstacksize failed" );
	}

	threaded = true;
	currentnumthreads = 0;
	currentthreadid = 0;
} //end of the function ThreadInitLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownLock( void ) {
	threaded = false;
} //end of the function ThreadShutdownLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOn( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	int i;
	pthread_t work_threads[MAX_THREADS];
	pthread_addr_t status;
	pthread_attr_t attrib;
	pthread_mutexattr_t mattrib;
	int start, end;

	Log_Print( "pthread multi-threading\n" );

	start = I_FloatTime();
	dispatch = 0;
	workcount = workcnt;
	oldf = -1;
	pacifier = showpacifier;
	threaded = true;

	if ( numthreads < 1 || numthreads > MAX_THREADS ) {
		numthreads = 1;
	}

	if ( pacifier ) {
		setbuf( stdout, NULL );
	}

	if ( !my_mutex ) {
		my_mutex = GetMemory( sizeof( *my_mutex ) );
		if ( pthread_mutexattr_create( &mattrib ) == -1 ) {
			Error( "pthread_mutex_attr_create failed" );
		}
		if ( pthread_mutexattr_setkind_np( &mattrib, MUTEX_FAST_NP ) == -1 ) {
			Error( "pthread_mutexattr_setkind_np failed" );
		}
		if ( pthread_mutex_init( my_mutex, mattrib ) == -1 ) {
			Error( "pthread_mutex_init failed" );
		}
	}

	if ( pthread_attr_create( &attrib ) == -1 ) {
		Error( "pthread_attr_create failed" );
	}
	if ( pthread_attr_setstacksize( &attrib, 0x100000 ) == -1 ) {
		Error( "pthread_attr_setstacksize failed" );
	}

	for ( i = 0 ; i < numthreads ; i++ )
	{
		if ( pthread_create( &work_threads[i], attrib
							 , (pthread_startroutine_t)func, (pthread_addr_t)i ) == -1 ) {
			Error( "pthread_create failed" );
		}
	}

	for ( i = 0 ; i < numthreads ; i++ )
	{
		if ( pthread_join( work_threads[i], &status ) == -1 ) {
			Error( "pthread_join failed" );
		}
	}

	threaded = false;

	end = I_FloatTime();
	if ( pacifier ) {
		printf( " (%i)\n", end - start );
	}
} //end of the function RunThreadsOn
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AddThread( void ( *func )(int) ) {
	thread_t *thread;

	if ( numthreads == 1 ) {
		if ( currentnumthreads >= numthreads ) {
			return;
		}
		currentnumthreads++;
		func( -1 );
		currentnumthreads--;
	} //end if
	else
	{
		ThreadLock();
		if ( currentnumthreads >= numthreads ) {
			ThreadUnlock();
			return;
		} //end if
		  //allocate new thread
		thread = GetMemory( sizeof( thread_t ) );
		if ( !thread ) {
			Error( "can't allocate memory for thread\n" );
		}
		//
		thread->threadid = currentthreadid;

		if ( pthread_create( &thread->thread, attrib, (pthread_startroutine_t)func, (pthread_addr_t)thread->threadid ) == -1 ) {
			Error( "pthread_create failed" );
		}

		//add the thread to the end of the list
		thread->next = NULL;
		if ( lastthread ) {
			lastthread->next = thread;
		} else { firstthread = thread;}
		lastthread = thread;
		//
#ifdef THREAD_DEBUG
		qprintf( "added thread with id %d\n", thread->threadid );
#endif //THREAD_DEBUG
	   //
		currentnumthreads++;
		currentthreadid++;
		//
		ThreadUnlock();
	} //end else
} //end of the function AddThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RemoveThread( int threadid ) {
	thread_t *thread, *last;

	//if a single thread
	if ( threadid == -1 ) {
		return;
	}
	//
	ThreadLock();
	last = NULL;
	for ( thread = firstthread; thread; thread = thread->next )
	{
		if ( thread->threadid == threadid ) {
			if ( last ) {
				last->next = thread->next;
			} else { firstthread = thread->next;}
			if ( !thread->next ) {
				lastthread = last;
			}
			//
			FreeMemory( thread );
			currentnumthreads--;
#ifdef THREAD_DEBUG
			qprintf( "removed thread with id %d\n", threadid );
#endif //THREAD_DEBUG
			break;
		} //end if
		last = thread;
	} //end if
	if ( !thread ) {
		Error( "couldn't find thread with id %d", threadid );
	}
	ThreadUnlock();
} //end of the function RemoveThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WaitForAllThreadsFinished( void ) {
	pthread_t *thread;
	pthread_addr_t status;

	ThreadLock();
	while ( firstthread )
	{
		thread = &firstthread->thread;
		ThreadUnlock();

		if ( pthread_join( *thread, &status ) == -1 ) {
			Error( "pthread_join failed" );
		}

		ThreadLock();
	} //end while
	ThreadUnlock();
} //end of the function WaitForAllThreadsFinished
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetNumThreads( void ) {
	return currentnumthreads;
} //end of the function GetNumThreads

#endif

//===================================================================
//
// LINUX
//
//===================================================================

#if defined( LINUX )

#define USED

#include <pthread.h>
#include <semaphore.h>

typedef struct thread_s
{
	pthread_t thread;
	int threadid;
	int id;
	struct thread_s *next;
} thread_t;

thread_t *firstthread;
thread_t *lastthread;
int currentnumthreads;
int currentthreadid;

int numthreads = 1;
pthread_mutex_t my_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_attr_t attrib;
sem_t semaphore;
static int enter;
static int numwaitingthreads = 0;


//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetDefault( void ) {
	if ( numthreads == -1 ) { // not set manually
		numthreads = 1;
	} //end if
	qprintf( "%i threads\n", numthreads );
} //end of the function ThreadSetDefault
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadLock( void ) {
	if ( !threaded ) {
		Error( "ThreadLock: !threaded" );
		return;
	} //end if
	pthread_mutex_lock( &my_mutex );
	if ( enter ) {
		Error( "Recursive ThreadLock\n" );
	}
	enter = 1;
} //end of the function ThreadLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadUnlock( void ) {
	if ( !threaded ) {
		Error( "ThreadUnlock: !threaded" );
		return;
	} //end if
	if ( !enter ) {
		Error( "ThreadUnlock without lock\n" );
	}
	enter = 0;
	pthread_mutex_unlock( &my_mutex );
} //end of the function ThreadUnlock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupLock( void ) {
	pthread_mutexattr_t mattrib;

	Log_Print( "pthread multi-threading\n" );

	threaded = true;
	currentnumthreads = 0;
	currentthreadid = 0;
} //end of the function ThreadInitLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownLock( void ) {
	threaded = false;
} //end of the function ThreadShutdownLock
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadSetupSemaphore( void ) {
	sem_init( &semaphore, 0, 0 );
} //end of the function ThreadSetupSemaphore
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownSemaphore( void ) {
	sem_destroy( &semaphore );
} //end of the function ThreadShutdownSemaphore
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreWait( void ) {
	sem_wait( &semaphore );
} //end of the function ThreadSemaphoreWait
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreIncrease( int count ) {
	int i;

	for ( i = 0; i < count; i++ )
	{
		sem_post( &semaphore );
	} //end for
} //end of the function ThreadSemaphoreIncrease
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOn( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	int i;
	pthread_t work_threads[MAX_THREADS];
	void *pthread_return;
	pthread_attr_t attrib;
	pthread_mutexattr_t mattrib;
	int start, end;

	Log_Print( "pthread multi-threading\n" );

	start = I_FloatTime();
	dispatch = 0;
	workcount = workcnt;
	oldf = -1;
	pacifier = showpacifier;
	threaded = true;

	if ( numthreads < 1 || numthreads > MAX_THREADS ) {
		numthreads = 1;
	}

	if ( pacifier ) {
		setbuf( stdout, NULL );
	}

	for ( i = 0 ; i < numthreads ; i++ )
	{
		if ( pthread_create( &work_threads[i], NULL, (void *)func, (void *)i ) == -1 ) {
			Error( "pthread_create failed" );
		}
	}

	for ( i = 0 ; i < numthreads ; i++ )
	{
		if ( pthread_join( work_threads[i], &pthread_return ) == -1 ) {
			Error( "pthread_join failed" );
		}
	}

	threaded = false;

	end = I_FloatTime();
	if ( pacifier ) {
		printf( " (%i)\n", end - start );
	}
} //end of the function RunThreadsOn
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AddThread( void ( *func )(int) ) {
	thread_t *thread;

	if ( numthreads == 1 ) {
		if ( currentnumthreads >= numthreads ) {
			return;
		}
		currentnumthreads++;
		func( -1 );
		currentnumthreads--;
	} //end if
	else
	{
		ThreadLock();
		if ( currentnumthreads >= numthreads ) {
			ThreadUnlock();
			return;
		} //end if
		  //allocate new thread
		thread = GetMemory( sizeof( thread_t ) );
		if ( !thread ) {
			Error( "can't allocate memory for thread\n" );
		}
		//
		thread->threadid = currentthreadid;

		if ( pthread_create( &thread->thread, NULL, (void *)func, (void *)thread->threadid ) == -1 ) {
			Error( "pthread_create failed" );
		}

		//add the thread to the end of the list
		thread->next = NULL;
		if ( lastthread ) {
			lastthread->next = thread;
		} else { firstthread = thread;}
		lastthread = thread;
		//
#ifdef THREAD_DEBUG
		qprintf( "added thread with id %d\n", thread->threadid );
#endif //THREAD_DEBUG
	   //
		currentnumthreads++;
		currentthreadid++;
		//
		ThreadUnlock();
	} //end else
} //end of the function AddThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RemoveThread( int threadid ) {
	thread_t *thread, *last;

	//if a single thread
	if ( threadid == -1 ) {
		return;
	}
	//
	ThreadLock();
	last = NULL;
	for ( thread = firstthread; thread; thread = thread->next )
	{
		if ( thread->threadid == threadid ) {
			if ( last ) {
				last->next = thread->next;
			} else { firstthread = thread->next;}
			if ( !thread->next ) {
				lastthread = last;
			}
			//
			FreeMemory( thread );
			currentnumthreads--;
#ifdef THREAD_DEBUG
			qprintf( "removed thread with id %d\n", threadid );
#endif //THREAD_DEBUG
			break;
		} //end if
		last = thread;
	} //end if
	if ( !thread ) {
		Error( "couldn't find thread with id %d", threadid );
	}
	ThreadUnlock();
} //end of the function RemoveThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WaitForAllThreadsFinished( void ) {
	pthread_t *thread;
	void *pthread_return;

	ThreadLock();
	while ( firstthread )
	{
		thread = &firstthread->thread;
		ThreadUnlock();

		if ( pthread_join( *thread, &pthread_return ) == -1 ) {
			Error( "pthread_join failed" );
		}

		ThreadLock();
	} //end while
	ThreadUnlock();
} //end of the function WaitForAllThreadsFinished
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetNumThreads( void ) {
	return currentnumthreads;
} //end of the function GetNumThreads

#endif //LINUX


//===================================================================
//
// IRIX
//
//===================================================================

#ifdef _MIPS_ISA

#define USED

#include <task.h>
#include <abi_mutex.h>
#include <sys/types.h>
#include <sys/prctl.h>

typedef struct thread_s
{
	int threadid;
	int id;
	struct thread_s *next;
} thread_t;

thread_t *firstthread;
thread_t *lastthread;
int currentnumthreads;
int currentthreadid;

int numthreads = 1;
static int enter;
static int numwaitingthreads = 0;

abilock_t lck;

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetDefault( void ) {
	if ( numthreads == -1 ) {
		numthreads = prctl( PR_MAXPPROCS );
	}
	printf( "%i threads\n", numthreads );
//@@
	usconfig( CONF_INITUSERS, numthreads );
} //end of the function ThreadSetDefault
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadLock( void ) {
	spin_lock( &lck );
} //end of the function ThreadLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadUnlock( void ) {
	release_lock( &lck );
} //end of the function ThreadUnlock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupLock( void ) {
	init_lock( &lck );

	Log_Print( "IRIX multi-threading\n" );

	threaded = true;
	currentnumthreads = 0;
	currentthreadid = 0;
} //end of the function ThreadInitLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownLock( void ) {
	threaded = false;
} //end of the function ThreadShutdownLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOn( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	int i;
	int pid[MAX_THREADS];
	int start, end;

	start = I_FloatTime();
	dispatch = 0;
	workcount = workcnt;
	oldf = -1;
	pacifier = showpacifier;
	threaded = true;

	if ( numthreads < 1 || numthreads > MAX_THREADS ) {
		numthreads = 1;
	}

	if ( pacifier ) {
		setbuf( stdout, NULL );
	}

	init_lock( &lck );

	for ( i = 0 ; i < numthreads - 1 ; i++ )
	{
		pid[i] = sprocsp( ( void( * ) ( void *, size_t ) )func, PR_SALL, (void *)i
						  , NULL, 0x100000 );
//		pid[i] = sprocsp ( (void (*)(void *, size_t))func, PR_SALL, (void *)i
//			, NULL, 0x80000);
		if ( pid[i] == -1 ) {
			perror( "sproc" );
			Error( "sproc failed" );
		}
	}

	func( i );

	for ( i = 0 ; i < numthreads - 1 ; i++ )
		wait( NULL );

	threaded = false;

	end = I_FloatTime();
	if ( pacifier ) {
		printf( " (%i)\n", end - start );
	}
} //end of the function RunThreadsOn
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AddThread( void ( *func )(int) ) {
	thread_t *thread;

	if ( numthreads == 1 ) {
		if ( currentnumthreads >= numthreads ) {
			return;
		}
		currentnumthreads++;
		func( -1 );
		currentnumthreads--;
	} //end if
	else
	{
		ThreadLock();
		if ( currentnumthreads >= numthreads ) {
			ThreadUnlock();
			return;
		} //end if
		  //allocate new thread
		thread = GetMemory( sizeof( thread_t ) );
		if ( !thread ) {
			Error( "can't allocate memory for thread\n" );
		}
		//
		thread->threadid = currentthreadid;

		thread->id = sprocsp( ( void( * ) ( void *, size_t ) )func, PR_SALL, (void *)thread->threadid, NULL, 0x100000 );
		if ( thread->id == -1 ) {
			perror( "sproc" );
			Error( "sproc failed" );
		}

		//add the thread to the end of the list
		thread->next = NULL;
		if ( lastthread ) {
			lastthread->next = thread;
		} else { firstthread = thread;}
		lastthread = thread;
		//
#ifdef THREAD_DEBUG
		qprintf( "added thread with id %d\n", thread->threadid );
#endif //THREAD_DEBUG
	   //
		currentnumthreads++;
		currentthreadid++;
		//
		ThreadUnlock();
	} //end else
} //end of the function AddThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RemoveThread( int threadid ) {
	thread_t *thread, *last;

	//if a single thread
	if ( threadid == -1 ) {
		return;
	}
	//
	ThreadLock();
	last = NULL;
	for ( thread = firstthread; thread; thread = thread->next )
	{
		if ( thread->threadid == threadid ) {
			if ( last ) {
				last->next = thread->next;
			} else { firstthread = thread->next;}
			if ( !thread->next ) {
				lastthread = last;
			}
			//
			FreeMemory( thread );
			currentnumthreads--;
#ifdef THREAD_DEBUG
			qprintf( "removed thread with id %d\n", threadid );
#endif //THREAD_DEBUG
			break;
		} //end if
		last = thread;
	} //end if
	if ( !thread ) {
		Error( "couldn't find thread with id %d", threadid );
	}
	ThreadUnlock();
} //end of the function RemoveThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WaitForAllThreadsFinished( void ) {
	ThreadLock();
	while ( firstthread )
	{
		ThreadUnlock();

		//wait (NULL);

		ThreadLock();
	} //end while
	ThreadUnlock();
} //end of the function WaitForAllThreadsFinished
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetNumThreads( void ) {
	return currentnumthreads;
} //end of the function GetNumThreads

#endif //_MIPS_ISA


//=======================================================================
//
// SINGLE THREAD
//
//=======================================================================

#ifndef USED

int numthreads = 1;
int currentnumthreads = 0;

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetDefault( void ) {
	numthreads = 1;
} //end of the function ThreadSetDefault
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadLock( void ) {
} //end of the function ThreadLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadUnlock( void ) {
} //end of the function ThreadUnlock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupLock( void ) {
	Log_Print( "no multi-threading\n" );
} //end of the function ThreadInitLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownLock( void ) {
} //end of the function ThreadShutdownLock
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSetupSemaphore( void ) {
} //end of the function ThreadSetupSemaphore
//===========================================================================
//
// Parameter:			-
// Returns:				-
// Changes Globals:		-
//===========================================================================
void ThreadShutdownSemaphore( void ) {
} //end of the function ThreadShutdownSemaphore
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreWait( void ) {
} //end of the function ThreadSemaphoreWait
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void ThreadSemaphoreIncrease( int count ) {
} //end of the function ThreadSemaphoreIncrease
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RunThreadsOn( int workcnt, qboolean showpacifier, void ( *func )(int) ) {
	int start, end;

	Log_Print( "no multi-threading\n" );
	dispatch = 0;
	workcount = workcnt;
	oldf = -1;
	pacifier = showpacifier;
	start = I_FloatTime();
#ifdef NeXT
	if ( pacifier ) {
		setbuf( stdout, NULL );
	}
#endif
	func( 0 );

	end = I_FloatTime();
	if ( pacifier ) {
		printf( " (%i)\n", end - start );
	}
} //end of the function RunThreadsOn
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void AddThread( void ( *func )(int) ) {
	if ( currentnumthreads >= numthreads ) {
		return;
	}
	currentnumthreads++;
	func( -1 );
	currentnumthreads--;
} //end of the function AddThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void RemoveThread( int threadid ) {
} //end of the function RemoveThread
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WaitForAllThreadsFinished( void ) {
} //end of the function WaitForAllThreadsFinished
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int GetNumThreads( void ) {
	return currentnumthreads;
} //end of the function GetNumThreads

#endif //USED