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Fixed bug #935

Browse source 
Patrice Mandin

Hello,

I originally added pth support for threads in SDL 1.2 because on the Atari
platform we did not have any thread library.

I think pth support could be removed from SDL 1.3 for two reasons:

- Atari platform removed

- pth does not provides real (preemptive) threads, because it is user space,
and expect the application to call one of its function to give CPU to another
thread. So it is not exactly useful for applications, that expect threads to
run simultaneously.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404452
This commit is contained in:
Sam Lantinga 2010-01-24 20:47:20 +00:00
parent 73074be94a
commit 9d79206973
10 changed files with 0 additions and 490 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/thread/SDL_thread_c.h
View file

@ -31,8 +31,6 @@
#include "beos/SDL_systhread_c.h"
#elif SDL_THREAD_EPOC
#include "epoc/SDL_systhread_c.h"
#elif SDL_THREAD_PTH
#include "pth/SDL_systhread_c.h"
#elif SDL_THREAD_PTHREAD
#include "pthread/SDL_systhread_c.h"
#elif SDL_THREAD_SPROC

173
src/thread/pth/SDL_syscond.c
View file

@ -1,173 +0,0 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/*
* GNU pth conditions variables
*
* Patrice Mandin
*/
#include <pth.h>
#include "SDL_thread.h"
#include "SDL_sysmutex_c.h"
struct SDL_cond
{
pth_cond_t condpth_p;
};
/* Create a condition variable */
SDL_cond *
SDL_CreateCond(void)
{
SDL_cond *cond;
cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
if (cond) {
if (pth_cond_init(&(cond->condpth_p)) < 0) {
SDL_SetError("pthread_cond_init() failed");
SDL_free(cond);
cond = NULL;
}
} else {
SDL_OutOfMemory();
}
return (cond);
}
/* Destroy a condition variable */
void
SDL_DestroyCond(SDL_cond * cond)
{
if (cond) {
SDL_free(cond);
}
}
/* Restart one of the threads that are waiting on the condition variable */
int
SDL_CondSignal(SDL_cond * cond)
{
int retval;
if (!cond) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
retval = 0;
if (pth_cond_notify(&(cond->condpth_p), FALSE) != 0) {
SDL_SetError("pth_cond_notify() failed");
retval = -1;
}
return retval;
}
/* Restart all threads that are waiting on the condition variable */
int
SDL_CondBroadcast(SDL_cond * cond)
{
int retval;
if (!cond) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
retval = 0;
if (pth_cond_notify(&(cond->condpth_p), TRUE) != 0) {
SDL_SetError("pth_cond_notify() failed");
retval = -1;
}
return retval;
}
/* 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;
pth_event_t ev;
int sec;
if (!cond) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
retval = 0;
sec = ms / 1000;
ev = pth_event(PTH_EVENT_TIME,
pth_timeout(sec, (ms - sec * 1000) * 1000));
if (pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0) {
SDL_SetError("pth_cond_await() failed");
retval = -1;
}
pth_event_free(ev, PTH_FREE_ALL);
return retval;
}
/* Wait on the condition variable forever */
int
SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
{
int retval;
if (!cond) {
SDL_SetError("Passed a NULL condition variable");
return -1;
}
retval = 0;
if (pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0) {
SDL_SetError("pth_cond_await() failed");
retval = -1;
}
return retval;
}
/* vi: set ts=4 sw=4 expandtab: */

93
src/thread/pth/SDL_sysmutex.c
View file

@ -1,93 +0,0 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/*
* GNU pth mutexes
*
* Patrice Mandin
*/
#include <pth.h>
#include "SDL_mutex.h"
#include "SDL_sysmutex_c.h"
/* Create a mutex */
SDL_mutex *
SDL_CreateMutex(void)
{
SDL_mutex *mutex;
/* Allocate mutex memory */
mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
if (mutex) {
/* Create the mutex, with initial value signaled */
if (!pth_mutex_init(&(mutex->mutexpth_p))) {
SDL_SetError("Couldn't create mutex");
SDL_free(mutex);
mutex = NULL;
}
} else {
SDL_OutOfMemory();
}
return (mutex);
}
/* Free the mutex */
void
SDL_DestroyMutex(SDL_mutex * mutex)
{
if (mutex) {
SDL_free(mutex);
}
}
/* Lock the mutex */
int
SDL_mutexP(SDL_mutex * mutex)
{
if (mutex == NULL) {
SDL_SetError("Passed a NULL mutex");
return -1;
}
pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
return (0);
}
/* Unlock the mutex */
int
SDL_mutexV(SDL_mutex * mutex)
{
if (mutex == NULL) {
SDL_SetError("Passed a NULL mutex");
return -1;
}
pth_mutex_release(&(mutex->mutexpth_p));
return (0);
}
/* vi: set ts=4 sw=4 expandtab: */

33
src/thread/pth/SDL_sysmutex_c.h
View file

@ -1,33 +0,0 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifndef _SDL_SYSMUTEX_C_H_
#define _SDL_SYSMUTEX_C_H_
struct SDL_mutex
{
pth_mutex_t mutexpth_p;
};
#endif /* _SDL_SYSMUTEX_C_H_ */
/* vi: set ts=4 sw=4 expandtab: */

103
src/thread/pth/SDL_systhread.c
View file

@ -1,103 +0,0 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/*
* GNU pth threads
*
* Patrice Mandin
*/
#include <pth.h>
#include <signal.h>
#include "SDL_thread.h"
#include "../SDL_thread_c.h"
#include "../SDL_systhread.h"
/* List of signals to mask in the subthreads */
static int sig_list[] = {
SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
SIGVTALRM, SIGPROF, 0
};
static void *
RunThread(void *data)
{
SDL_RunThread(data);
pth_exit((void *) 0);
return ((void *) 0); /* Prevent compiler warning */
}
int
SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
{
pth_attr_t type;
/* Create a new attribute */
type = pth_attr_new();
if (type == NULL) {
SDL_SetError("Couldn't initialize pth attributes");
return (-1);
}
pth_attr_set(type, PTH_ATTR_JOINABLE, TRUE);
/* Create the thread and go! */
thread->handle = pth_spawn(type, RunThread, args);
if (thread->handle == NULL) {
SDL_SetError("Not enough resources to create thread");
return (-1);
}
return (0);
}
void
SDL_SYS_SetupThread(void)
{
int i;
sigset_t mask;
int oldstate;
/* Mask asynchronous signals for this thread */
sigemptyset(&mask);
for (i = 0; sig_list[i]; ++i) {
sigaddset(&mask, sig_list[i]);
}
pth_sigmask(SIG_BLOCK, &mask, 0);
/* Allow ourselves to be asynchronously cancelled */
pth_cancel_state(PTH_CANCEL_ASYNCHRONOUS, &oldstate);
}
SDL_threadID
SDL_ThreadID(void)
{
return ((SDL_threadID) pth_self());
}
void
SDL_SYS_WaitThread(SDL_Thread * thread)
{
pth_join(thread->handle, NULL);
}
/* vi: set ts=4 sw=4 expandtab: */

32
src/thread/pth/SDL_systhread_c.h
View file

@ -1,32 +0,0 @@
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 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
*/
#include "SDL_config.h"
#ifndef _SDL_SYSTHREAD_C_H_
#define _SDL_SYSTHREAD_C_H_
#include <pth.h>
typedef pth_t SYS_ThreadHandle;
#endif /* _SDL_SYSTHREAD_C_H_ */
/* vi: set ts=4 sw=4 expandtab: */