135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* Thread eval for VIPS.
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*
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* 29/9/99 JC
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* - from thread.h
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifndef IM_THREADGROUP_H
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#define IM_THREADGROUP_H
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#ifdef __cplusplus
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extern "C" {
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#endif /*__cplusplus*/
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#include <vips/semaphore.h>
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/* Stack size for each thread. Need to set this explicitly because some
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* systems have a very low default.
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FIXME ... should have an environment variable for this?
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*/
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#define IM__DEFAULT_STACK_SIZE (2 * 1024 * 1024)
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/* Default tile geometry.
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*/
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extern int im__tile_width;
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extern int im__tile_height;
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extern int im__fatstrip_height;
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extern int im__thinstrip_height;
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/* Default n threads.
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*/
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extern int im__concurrency;
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/* A work function.
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*/
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typedef int (*im__work_fn)( REGION *, void *, void *, void * );
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/* What we track for each thread.
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*/
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typedef struct {
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REGION *reg; /* Region this thread operates on */
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struct im__threadgroup_t *tg; /* Thread group we are part of */
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GThread *thread; /* Thread for this region */
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im_semaphore_t go; /* Thread waits here to start work */
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int kill; /* Set this to make thread exit */
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int error; /* Set by thread if work fn fails */
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REGION *oreg; /* If part of an inplace threadgroup, */
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Rect pos; /* where this thread should write */
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int x, y; /* it's result */
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void *a, *b, *c; /* User arguments to work fns */
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#ifdef TIME_THREAD
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hrtime_t *btime, *etime;
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int tpos;
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#endif /*TIME_THREAD*/
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} im_thread_t;
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/* What we track for a group of threads working together.
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*/
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typedef struct im__threadgroup_t {
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int zombie; /* Set if has been freed */
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IMAGE *im; /* Image we are calculating */
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int pw, ph; /* Tile size */
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int nlines; /* Scanlines-at-once we prefer for iteration */
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im__work_fn work; /* Work fn for this threadgroup */
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int inplace; /* Regions should be contiguous */
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int nthr; /* Number of threads in group */
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im_thread_t **thr; /* Threads */
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im_semaphore_t idle_sem;/* The number of idle threads */
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GSList *idle; /* All the idle threads */
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GMutex *idle_lock;
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#ifdef DEBUG_HIGHWATER
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int nidle; /* Number of idles */
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int min_idle; /* How short idle got */
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#endif /*DEBUG_HIGHWATER*/
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int kill; /* Set this to stop threadgroup early */
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} im_threadgroup_t;
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void im_concurrency_set( int concurrency );
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int im_concurrency_get( void );
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/* Thread group functions.
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*/
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im_threadgroup_t *im_threadgroup_create( IMAGE *im );
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int im_threadgroup_free( im_threadgroup_t *tg );
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im_thread_t *im_threadgroup_get( im_threadgroup_t *tg );
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void im_threadgroup_wait( im_threadgroup_t *tg );
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int im_threadgroup_iserror( im_threadgroup_t *tg );
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void im_threadgroup_trigger( im_thread_t *thr );
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/* Threaded im_prepare()
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*/
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int im_prepare_thread( im_threadgroup_t *tg, REGION *oreg, Rect *r );
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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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#endif /*IM_THREADGROUP_H*/
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