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Added initial support for Dreamcast (thanks HERO!)

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40510
This commit is contained in:
Sam Lantinga 2002-10-05 16:50:56 +00:00
parent 148a1a64f4
commit 3ee2de057f
43 changed files with 2847 additions and 4 deletions
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1
src/thread/Makefile.am
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@ -7,6 +7,7 @@ ARCH_SUBDIRS = $(srcdir)/generic \
$(srcdir)/amigaos \
$(srcdir)/beos \
$(srcdir)/bsdi \
$(srcdir)/dc \
$(srcdir)/epoc \
$(srcdir)/irix \
$(srcdir)/linux \

223
src/thread/dc/SDL_syscond.c Normal file
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* An implementation of condition variables using semaphores and mutexes */
/*
This implementation borrows heavily from the BeOS condition variable
implementation, written by Christopher Tate and Owen Smith. Thanks!
*/
#include <stdio.h>
#include <stdlib.h>
#include "SDL_error.h"
#include "SDL_thread.h"
struct SDL_cond
{
SDL_mutex *lock;
int waiting;
int signals;
SDL_sem *wait_sem;
SDL_sem *wait_done;
};
/* Create a condition variable */
SDL_cond * SDL_CreateCond(void)
{
SDL_cond *cond;
cond = (SDL_cond *) malloc(sizeof(SDL_cond));
if ( cond ) {
cond->lock = SDL_CreateMutex();
cond->wait_sem = SDL_CreateSemaphore(0);
cond->wait_done = SDL_CreateSemaphore(0);
cond->waiting = cond->signals = 0;
if ( ! cond->lock || ! cond->wait_sem || ! cond->wait_done ) {
SDL_DestroyCond(cond);
cond = NULL;
}
} else {
SDL_OutOfMemory();
}
return(cond);
}
/* Destroy a condition variable */
void SDL_DestroyCond(SDL_cond *cond)
{
if ( cond ) {
if ( cond->wait_sem ) {
SDL_DestroySemaphore(cond->wait_sem);
}
if ( cond->wait_done ) {
SDL_DestroySemaphore(cond->wait_done);
}
if ( cond->lock ) {
SDL_DestroyMutex(cond->lock);
}
free(cond);
}
}
/* Restart one of the threads that are waiting on the condition variable */
int SDL_CondSignal(SDL_cond *cond)
{
if ( ! cond ) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
/* If there are waiting threads not already signalled, then
signal the condition and wait for the thread to respond.
*/
SDL_LockMutex(cond->lock);
if ( cond->waiting > cond->signals ) {
++cond->signals;
SDL_SemPost(cond->wait_sem);
SDL_UnlockMutex(cond->lock);
SDL_SemWait(cond->wait_done);
} else {
SDL_UnlockMutex(cond->lock);
}
return 0;
}
/* Restart all threads that are waiting on the condition variable */
int SDL_CondBroadcast(SDL_cond *cond)
{
if ( ! cond ) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
/* If there are waiting threads not already signalled, then
signal the condition and wait for the thread to respond.
*/
SDL_LockMutex(cond->lock);
if ( cond->waiting > cond->signals ) {
int i, num_waiting;
num_waiting = (cond->waiting - cond->signals);
cond->signals = cond->waiting;
for ( i=0; i<num_waiting; ++i ) {
SDL_SemPost(cond->wait_sem);
}
/* Now all released threads are blocked here, waiting for us.
Collect them all (and win fabulous prizes!) :-)
*/
SDL_UnlockMutex(cond->lock);
for ( i=0; i<num_waiting; ++i ) {
SDL_SemWait(cond->wait_done);
}
} else {
SDL_UnlockMutex(cond->lock);
}
return 0;
}
/* Wait on the condition variable for at most 'ms' milliseconds.
The mutex must be locked before entering this function!
The mutex is unlocked during the wait, and locked again after the wait.
Typical use:
Thread A:
SDL_LockMutex(lock);
while ( ! condition ) {
SDL_CondWait(cond);
}
SDL_UnlockMutex(lock);
Thread B:
SDL_LockMutex(lock);
...
condition = true;
...
SDL_UnlockMutex(lock);
*/
int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
{
int retval;
if ( ! cond ) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
/* Obtain the protection mutex, and increment the number of waiters.
This allows the signal mechanism to only perform a signal if there
are waiting threads.
*/
SDL_LockMutex(cond->lock);
++cond->waiting;
SDL_UnlockMutex(cond->lock);
/* Unlock the mutex, as is required by condition variable semantics */
SDL_UnlockMutex(mutex);
/* Wait for a signal */
if ( ms == SDL_MUTEX_MAXWAIT ) {
retval = SDL_SemWait(cond->wait_sem);
} else {
retval = SDL_SemWaitTimeout(cond->wait_sem, ms);
}
/* Let the signaler know we have completed the wait, otherwise
the signaler can race ahead and get the condition semaphore
if we are stopped between the mutex unlock and semaphore wait,
giving a deadlock. See the following URL for details:
http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
*/
SDL_LockMutex(cond->lock);
if ( cond->signals > 0 ) {
/* If we timed out, we need to eat a condition signal */
if ( retval > 0 ) {
SDL_SemWait(cond->wait_sem);
}
/* We always notify the signal thread that we are done */
SDL_SemPost(cond->wait_done);
/* Signal handshake complete */
--cond->signals;
}
--cond->waiting;
SDL_UnlockMutex(cond->lock);
/* Lock the mutex, as is required by condition variable semantics */
SDL_LockMutex(mutex);
return retval;
}
/* Wait on the condition variable forever */
int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
{
return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
}

27
src/thread/dc/SDL_syscond_c.h Normal file
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@ -0,0 +1,27 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif

135
src/thread/dc/SDL_sysmutex.c Normal file
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@ -0,0 +1,135 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
BERO
bero@geocities.co.jp
based on generic/SDL_sysmutex.c
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* An implementation of mutexes using semaphores */
#include <stdio.h>
#include <stdlib.h>
#include "SDL_error.h"
#include "SDL_thread.h"
#include "SDL_systhread_c.h"
#include <arch/spinlock.h>
struct SDL_mutex {
int recursive;
Uint32 owner;
spinlock_t mutex;
};
/* Create a mutex */
SDL_mutex *SDL_CreateMutex(void)
{
SDL_mutex *mutex;
/* Allocate mutex memory */
mutex = (SDL_mutex *)malloc(sizeof(*mutex));
if ( mutex ) {
spinlock_init(&mutex->mutex);
mutex->recursive = 0;
mutex->owner = 0;
} else {
SDL_OutOfMemory();
}
return mutex;
}
/* Free the mutex */
void SDL_DestroyMutex(SDL_mutex *mutex)
{
if ( mutex ) {
free(mutex);
}
}
/* Lock the semaphore */
int SDL_mutexP(SDL_mutex *mutex)
{
#ifdef DISABLE_THREADS
return 0;
#else
Uint32 this_thread;
if ( mutex == NULL ) {
SDL_SetError("Passed a NULL mutex");
return -1;
}
this_thread = SDL_ThreadID();
if ( mutex->owner == this_thread ) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
spinlock_lock(&mutex->mutex);
mutex->owner = this_thread;
mutex->recursive = 0;
}
return 0;
#endif /* DISABLE_THREADS */
}
/* Unlock the mutex */
int SDL_mutexV(SDL_mutex *mutex)
{
#ifdef DISABLE_THREADS
return 0;
#else
if ( mutex == NULL ) {
SDL_SetError("Passed a NULL mutex");
return -1;
}
/* If we don't own the mutex, we can't unlock it */
if ( SDL_ThreadID() != mutex->owner ) {
SDL_SetError("mutex not owned by this thread");
return -1;
}
if ( mutex->recursive ) {
--mutex->recursive;
} else {
/* The order of operations is important.
First reset the owner so another thread doesn't lock
the mutex and set the ownership before we reset it,
then release the lock semaphore.
*/
mutex->owner = 0;
spinlock_unlock(&mutex->mutex);
}
return 0;
#endif /* DISABLE_THREADS */
}

27
src/thread/dc/SDL_sysmutex_c.h Normal file
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@ -0,0 +1,27 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif

180
src/thread/dc/SDL_syssem.c Normal file
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@ -0,0 +1,180 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
BERO
bero@geocities.co.jp
based on generic/SDL_syssem.c
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* An implementation of semaphores using mutexes and condition variables */
#include <stdlib.h>
#include "SDL_error.h"
#include "SDL_timer.h"
#include "SDL_thread.h"
#include "SDL_systhread_c.h"
#ifdef DISABLE_THREADS
SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
{
SDL_SetError("SDL not configured with thread support");
return (SDL_sem *)0;
}
void SDL_DestroySemaphore(SDL_sem *sem)
{
return;
}
int SDL_SemTryWait(SDL_sem *sem)
{
SDL_SetError("SDL not configured with thread support");
return -1;
}
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
{
SDL_SetError("SDL not configured with thread support");
return -1;
}
int SDL_SemWait(SDL_sem *sem)
{
SDL_SetError("SDL not configured with thread support");
return -1;
}
Uint32 SDL_SemValue(SDL_sem *sem)
{
return 0;
}
int SDL_SemPost(SDL_sem *sem)
{
SDL_SetError("SDL not configured with thread support");
return -1;
}
#else
#include <kos/sem.h>
struct SDL_semaphore
{
semaphore_t sem;
};
SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
{
return (SDL_sem *)sem_create(initial_value);
}
/* WARNING:
You cannot call this function when another thread is using the semaphore.
*/
void SDL_DestroySemaphore(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return;
}
sem_destroy(&sem->sem);
}
int SDL_SemTryWait(SDL_sem *sem)
{
int retval;
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return -1;
}
retval = sem_trywait(&sem->sem);
if (retval==0) return 0;
else return SDL_MUTEX_TIMEDOUT;
return retval;
}
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
{
int retval;
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return -1;
}
/* A timeout of 0 is an easy case */
if ( timeout == 0 ) {
return SDL_SemTryWait(sem);
}
retval = sem_wait_timed(&sem->sem,timeout);
if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
return retval;
}
int SDL_SemWait(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return -1;
}
sem_wait(&sem->sem);
return 0;
}
Uint32 SDL_SemValue(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return -1;
}
return sem_count(&sem->sem);
}
int SDL_SemPost(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL semaphore");
return -1;
}
sem_signal(&sem->sem);
return 0;
}
#endif /* DISABLE_THREADS */

27
src/thread/dc/SDL_syssem_c.h Normal file
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@ -0,0 +1,27 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif

98
src/thread/dc/SDL_systhread.c Normal file
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@ -0,0 +1,98 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
BERO
bero@geocities.co.jp
based on generic/SDL_thread.c
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* Thread management routines for SDL */
#include "SDL_error.h"
#include "SDL_thread.h"
#include "SDL_systhread.h"
#include <kos/thread.h>
#ifdef DISABLE_THREADS
int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
SDL_SetError("Threads are not supported on this platform");
return(-1);
}
void SDL_SYS_SetupThread(void)
{
return;
}
Uint32 SDL_ThreadID(void)
{
return(0);
}
void SDL_SYS_WaitThread(SDL_Thread *thread)
{
return;
}
void SDL_SYS_KillThread(SDL_Thread *thread)
{
return;
}
#else
int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
thread->handle = thd_create(SDL_RunThread,args);
if (thread->handle == NULL) {
SDL_SetError("Not enough resources to create thread");
return(-1);
}
return(0);
}
void SDL_SYS_SetupThread(void)
{
return;
}
Uint32 SDL_ThreadID(void)
{
return (Uint32)thd_get_current();
}
void SDL_SYS_WaitThread(SDL_Thread *thread)
{
thd_wait(thread->handle);
}
void SDL_SYS_KillThread(SDL_Thread *thread)
{
thd_destroy(thread->handle);
}
#endif

29
src/thread/dc/SDL_systhread_c.h Normal file
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@ -0,0 +1,29 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
/* Stub until we implement threads on this platform */
typedef struct kthread* SYS_ThreadHandle;
/*
#ifndef DISABLE_THREADS
#define DISABLE_THREADS
#endif
*/