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/* taskset.c
Copyright (c) 2003-2013 HandBrake Team
This file is part of the HandBrake source code
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License v2.
For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#include "hb.h"
#include "ports.h"
#include "taskset.h"
int
taskset_init( taskset_t *ts, int thread_count, size_t arg_size )
{
int init_step;
init_step = 0;
memset( ts, 0, sizeof( *ts ) );
ts->thread_count = thread_count;
ts->arg_size = arg_size;
ts->bitmap_elements = ( ts->thread_count + 31 ) / 32;
ts->task_threads = malloc( sizeof( hb_thread_t* ) * ts->thread_count );
if( ts->task_threads == NULL )
goto fail;
init_step++;
if( arg_size != 0 )
{
ts->task_threads_args = malloc( arg_size * ts->thread_count );
if( ts->task_threads == NULL )
goto fail;
}
init_step++;
ts->task_begin_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_begin_bitmap == NULL )
goto fail;
init_step++;
ts->task_complete_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_complete_bitmap == NULL )
goto fail;
init_step++;
ts->task_stop_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_stop_bitmap == NULL )
goto fail;
init_step++;
ts->task_cond_lock = hb_lock_init();
if( ts->task_cond_lock == NULL)
goto fail;
init_step++;
ts->task_begin = hb_cond_init();
if( ts->task_begin == NULL)
goto fail;
init_step++;
ts->task_complete = hb_cond_init();
if( ts->task_complete == NULL)
goto fail;
init_step++;
/*
* Initialize all arg data to 0.
*/
memset(ts->task_threads_args, 0, ts->arg_size * ts->thread_count );
/*
* Inialize bitmaps to all bits set. This means that any unused bits
* in the bitmap are already in the "condition satisfied" state allowing
* us to test the bitmap 32bits at a time without having to mask off
* the end.
*/
memset(ts->task_begin_bitmap, 0xFF, sizeof( uint32_t ) * ts->bitmap_elements );
memset(ts->task_complete_bitmap, 0xFF, sizeof( uint32_t ) * ts->bitmap_elements );
memset(ts->task_stop_bitmap, 0, sizeof( uint32_t ) * ts->bitmap_elements );
/*
* Important to start off with the threads locked waiting
* on input, no work completed, and not asked to stop.
*/
bit_nclear( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
bit_nclear( ts->task_complete_bitmap, 0, ts->thread_count - 1 );
bit_nclear( ts->task_stop_bitmap, 0, ts->thread_count - 1 );
return (1);
fail:
switch (init_step)
{
default:
hb_cond_close( &ts->task_complete );
/* FALL THROUGH */
case 7:
hb_cond_close( &ts->task_begin );
/* FALL THROUGH */
case 6:
hb_lock_close( &ts->task_cond_lock );
/* FALL THROUGH */
case 5:
free( ts->task_stop_bitmap );
/* FALL THROUGH */
case 4:
free( ts->task_complete_bitmap );
/* FALL THROUGH */
case 3:
free( ts->task_begin_bitmap );
/* FALL THROUGH */
case 2:
if( ts->task_threads_args == NULL )
free( ts->task_threads_args );
/* FALL THROUGH */
case 1:
free( ts->task_threads );
/* FALL THROUGH */
case 0:
break;
}
return (0);
}
int
taskset_thread_spawn( taskset_t *ts, int thr_idx, const char *descr,
thread_func_t *func, int priority )
{
ts->task_threads[thr_idx] = hb_thread_init( descr, func,
taskset_thread_args( ts, thr_idx ),
priority);
return( ts->task_threads[thr_idx] != NULL );
}
void
taskset_cycle( taskset_t *ts )
{
hb_lock( ts->task_cond_lock );
/*
* Signal all threads that their work is available.
*/
bit_nset( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
hb_cond_broadcast( ts->task_begin );
/*
* Wait until all threads have completed. Note that we must
* loop here as hb_cond_wait() on some platforms (e.g pthead_cond_wait)
* may unblock prematurely.
*/
do
{
hb_cond_wait( ts->task_complete, ts->task_cond_lock );
} while ( !allbits_set( ts->task_complete_bitmap, ts->bitmap_elements ) );
/*
* Clear completion indications for next time.
*/
bit_nclear( ts->task_complete_bitmap, 0, ts->thread_count - 1 );
hb_unlock( ts->task_cond_lock );
}
/*
* Block current thread until work is available for it.
*/
void
taskset_thread_wait4start( taskset_t *ts, int thr_idx )
{
hb_lock( ts->task_cond_lock );
while ( bit_is_clear( ts->task_begin_bitmap, thr_idx ) )
hb_cond_wait( ts->task_begin, ts->task_cond_lock );
/*
* We've been released for one run. Insure we block the next
* time through the loop.
*/
bit_clear( ts->task_begin_bitmap, thr_idx );
hb_unlock( ts->task_cond_lock );
}
/*
* Current thread has completed its work. Indicate completion,
* and if all threads in this task set have completed, wakeup
* anyone waiting for this condition.
*/
void
taskset_thread_complete( taskset_t *ts, int thr_idx )
{
hb_lock( ts->task_cond_lock );
bit_set( ts->task_complete_bitmap, thr_idx );
if( allbits_set( ts->task_complete_bitmap, ts->bitmap_elements ) )
{
hb_cond_signal( ts->task_complete );
}
hb_unlock( ts->task_cond_lock );
}
void
taskset_fini( taskset_t *ts )
{
int i;
hb_lock( ts->task_cond_lock );
/*
* Tell each thread to stop, and then cleanup.
*/
bit_nset( ts->task_stop_bitmap, 0, ts->thread_count - 1 );
bit_nset( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
hb_cond_broadcast( ts->task_begin );
/*
* Wait for all threads to exit.
*/
hb_cond_wait( ts->task_complete, ts->task_cond_lock );
hb_unlock( ts->task_cond_lock );
/*
* Clean up taskset memory.
*/
for( i = 0; i < ts->thread_count; i++)
{
hb_thread_close( &ts->task_threads[i] );
}
hb_lock_close( &ts->task_cond_lock );
hb_cond_close( &ts->task_begin );
hb_cond_close( &ts->task_complete );
free( ts->task_threads );
if( ts->task_threads_args != NULL )
free( ts->task_threads_args );
free( ts->task_begin_bitmap );
free( ts->task_complete_bitmap );
free( ts->task_stop_bitmap );
}
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