From 968e1d8710004517639966bd4c6f83f37edccd21 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Wed, 8 Apr 2009 22:26:16 +0000 Subject: Add read-write mutexes to canvas pixels. New error infrastructure. --- libdimension/dimension/canvas.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'libdimension/dimension/canvas.h') diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h index 21d56e4..d40ed1d 100644 --- a/libdimension/dimension/canvas.h +++ b/libdimension/dimension/canvas.h @@ -25,6 +25,8 @@ #ifndef DIMENSION_CANVAS_H #define DIMENSION_CANVAS_H +#include + typedef struct { unsigned int x, y; @@ -33,9 +35,25 @@ typedef struct { * at (a,b) is accessible as pixels[b*x + a]. */ dmnsn_color *pixels; + + /* Read-write locks for each pixel */ + pthread_rwlock_t *rwlocks; } dmnsn_canvas; dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y); void dmnsn_delete_canvas(dmnsn_canvas *canvas); +/* These handle the rwlocks correctly */ +dmnsn_color dmnsn_get_pixel(const dmnsn_canvas *canvas, + unsigned int x, unsigned int y); +void dmnsn_set_pixel(dmnsn_canvas *canvas, dmnsn_color color, + unsigned int x, unsigned int y); + +/* Manual locking */ +void dmnsn_rdlock_pixel(const dmnsn_canvas *canvas, + unsigned int x, unsigned int y); +void dmnsn_wrlock_pixel(dmnsn_canvas *canvas, unsigned int x, unsigned int y); +void dmnsn_unlock_pixel(const dmnsn_canvas *canvas, + unsigned int x, unsigned int y); + #endif /* DIMENSION_CANVAS_H */ -- cgit v1.2.3