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stuff

This commit is contained in:
John Cupitt 2009-10-14 22:22:40 +00:00
parent cff79f403a
commit 5472ee939b
2 changed files with 33 additions and 11 deletions
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14
TODO
View File

@ -1,3 +1,17 @@
- need to call stop funcs from the worker as well
im_generate() does this my having im_region_free() call stop, if necessary
but we can't use that mechanism, since it relies on im->client1 etc. which
for us will be the copy operation that generated the image
regions need a call-this-to-free-seq function which is installed by
generate or iterate as appropriate
no, that won't work, when could we install the callbacks?
we must call the stop functions from the worker threads, that'll take care of
freeing the regions in the right context for us
- memory.c

30
libvips/iofuncs/region.c
View File

@ -87,7 +87,6 @@
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <assert.h>
#include <vips/vips.h>
#include <vips/internal.h>
@ -116,6 +115,15 @@
*
* A region can be a memory buffer, part of a memory-mapped file, part of some
* other image, or part of some other region.
*
* Regions must be created, used and freed all within the same thread, since
* they can reference private per-thread caches. VIPS sanity-checks region
* ownership in various places, so you are likely to see g_assert() errors if
* you don't follow this rule.
*
* There
* is API to transfer ownership of regions between threads, but hopefully this
* is only needed within VIPS, so we don't expose it. Hopefully.
*/
/**
@ -206,7 +214,7 @@ im__call_start( REGION *reg )
}
/* Call a stop function if a sequence is running in this REGION. No error
* return, really.
* return is possible, really.
*/
void
im__call_stop( REGION *reg )
@ -231,7 +239,7 @@ im__call_stop( REGION *reg )
/* If a region is being created in one thread (eg. the main thread) and then
* used in another (eg. a worker thread), the new thread needs to tell VIPS
* to stop sanity assert() fails. The previous owner needs to
* to stop sanity g_assert() fails. The previous owner needs to
* im__region_no_ownership() before we can call this.
*/
void
@ -242,13 +250,13 @@ im__region_take_ownership( REGION *reg )
*/
g_mutex_lock( reg->im->sslock );
assert( reg->thread == NULL );
g_assert( reg->thread == NULL );
/* We don't want to move shared buffers: the other region using this
* buffer will still be on the other thread. Not sure if this will
* ever happen: if it does, we'll need to dup the buffer.
*/
assert( !reg->buffer || reg->buffer->ref_count == 1 );
g_assert( !reg->buffer || reg->buffer->ref_count == 1 );
reg->thread = g_thread_self();
@ -259,9 +267,9 @@ void
im__region_check_ownership( REGION *reg )
{
if( reg->thread ) {
assert( reg->thread == g_thread_self() );
g_assert( reg->thread == g_thread_self() );
if( reg->buffer && reg->buffer->cache )
assert( reg->thread == reg->buffer->cache->thread );
g_assert( reg->thread == reg->buffer->cache->thread );
}
}
@ -392,7 +400,7 @@ im_region_free( REGION *reg )
#ifdef DEBUG
g_mutex_lock( im__global_lock );
assert( g_slist_find( im__regions_all, reg ) );
g_assert( g_slist_find( im__regions_all, reg ) );
im__regions_all = g_slist_remove( im__regions_all, reg );
printf( "%d regions in vips\n", g_slist_length( im__regions_all ) );
g_mutex_unlock( im__global_lock );
@ -597,7 +605,7 @@ im_region_region( REGION *reg, REGION *dest, Rect *r, int x, int y )
/* We can't test
assert( dest->thread == g_thread_self() );
g_assert( dest->thread == g_thread_self() );
* since we can have several threads writing to the same region in
* threadgroup.
@ -723,8 +731,8 @@ im_region_position( REGION *reg, int x, int y )
int
im_region_fill( REGION *reg, Rect *r, im_region_fill_fn fn, void *a )
{
assert( reg->im->dtype == IM_PARTIAL );
assert( reg->im->generate );
g_assert( reg->im->dtype == IM_PARTIAL );
g_assert( reg->im->generate );
/* Should have local memory.
*/