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/**
*
* $Id:
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2006 Blender Foundation
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "BLI_threads.h"
/* ********** basic thread control API ************
Many thread cases have an X amount of jobs, and only an Y amount of
threads are useful (typically amount of cpus)
This code can be used to start a maximum amount of 'thread slots', which
then can be filled in a loop with an idle timer.
A sample loop can look like this (pseudo c);
ListBase lb;
int maxthreads= 2;
int cont= 1;
BLI_init_threads(&lb, do_something_func, maxthreads);
while(cont) {
if(BLI_available_threads(&lb) && !(escape loop event)) {
// get new job (data pointer)
// tag job 'processed
BLI_insert_thread(&lb, job);
}
else PIL_sleep_ms(50);
// find if a job is ready, this the do_something_func() should write in job somewhere
cont= 0;
for(go over all jobs)
if(job is ready) {
if(job was not removed) {
BLI_remove_thread(&lb, job);
}
}
else cont= 1;
}
// conditions to exit loop
if(if escape loop event) {
if(BLI_available_threadslots(&lb)==maxthreads)
break;
}
}
BLI_end_threads(&lb);
************************************************ */
static pthread_mutex_t _malloc_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t _image_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t _custom1_lock = PTHREAD_MUTEX_INITIALIZER;
static int thread_levels= 0; /* threads can be invoked inside threads */
/* just a max for security reasons */
#define RE_MAX_THREAD 8
typedef struct ThreadSlot {
struct ThreadSlot *next, *prev;
void *(*do_thread)(void *);
void *callerdata;
pthread_t pthread;
int avail;
} ThreadSlot;
static void BLI_lock_malloc_thread(void)
{
pthread_mutex_lock(&_malloc_lock);
}
static void BLI_unlock_malloc_thread(void)
{
pthread_mutex_unlock(&_malloc_lock);
}
void BLI_init_threads(ListBase *threadbase, void *(*do_thread)(void *), int tot)
{
int a;
if(threadbase==NULL)
return;
threadbase->first= threadbase->last= NULL;
if(tot>RE_MAX_THREAD) tot= RE_MAX_THREAD;
else if(tot<1) tot= 1;
for(a=0; a<tot; a++) {
ThreadSlot *tslot= MEM_callocN(sizeof(ThreadSlot), "threadslot");
BLI_addtail(threadbase, tslot);
tslot->do_thread= do_thread;
tslot->avail= 1;
}
MEM_set_lock_callback(BLI_lock_malloc_thread, BLI_unlock_malloc_thread);
thread_levels++;
}
/* amount of available threads */
int BLI_available_threads(ListBase *threadbase)
{
ThreadSlot *tslot;
int counter=0;
for(tslot= threadbase->first; tslot; tslot= tslot->next) {
if(tslot->avail)
counter++;
}
return counter;
}
/* returns thread number, for sample patterns or threadsafe tables */
int BLI_available_thread_index(ListBase *threadbase)
{
ThreadSlot *tslot;
int counter=0;
for(tslot= threadbase->first; tslot; tslot= tslot->next, counter++) {
if(tslot->avail)
return counter;
}
return 0;
}
void BLI_insert_thread(ListBase *threadbase, void *callerdata)
{
ThreadSlot *tslot;
for(tslot= threadbase->first; tslot; tslot= tslot->next) {
if(tslot->avail) {
tslot->avail= 0;
tslot->callerdata= callerdata;
pthread_create(&tslot->pthread, NULL, tslot->do_thread, tslot->callerdata);
return;
}
}
printf("ERROR: could not insert thread slot\n");
}
void BLI_remove_thread(ListBase *threadbase, void *callerdata)
{
ThreadSlot *tslot;
for(tslot= threadbase->first; tslot; tslot= tslot->next) {
if(tslot->callerdata==callerdata) {
tslot->callerdata= NULL;
pthread_join(tslot->pthread, NULL);
tslot->avail= 1;
}
}
}
void BLI_end_threads(ListBase *threadbase)
{
ThreadSlot *tslot;
for(tslot= threadbase->first; tslot; tslot= tslot->next) {
if(tslot->avail==0) {
pthread_join(tslot->pthread, NULL);
}
}
BLI_freelistN(threadbase);
thread_levels--;
if(thread_levels==0)
MEM_set_lock_callback(NULL, NULL);
}
void BLI_lock_thread(int type)
{
if (type==LOCK_IMAGE)
pthread_mutex_lock(&_image_lock);
else if (type==LOCK_CUSTOM1)
pthread_mutex_lock(&_custom1_lock);
}
void BLI_unlock_thread(int type)
{
if (type==LOCK_IMAGE)
pthread_mutex_unlock(&_image_lock);
else if(type==LOCK_CUSTOM1)
pthread_mutex_unlock(&_custom1_lock);
}
/* eof */
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