[cairo-commit] src/cairo.c
Chris Wilson
ickle at kemper.freedesktop.org
Thu May 6 09:24:17 PDT 2010
src/cairo.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)
New commits:
commit 506636e19edcdb656c94f61c915c9d49829dade8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Thu May 6 17:21:59 2010 +0100
cairo: stash a number of contexts for use with NO_MUTEX
The implementation is the same as the atomic one (bar the use of atomic
primitives to manipulate the occupancy!).
Patch based on the original by Jeff Muizelaar.
diff --git a/src/cairo.c b/src/cairo.c
index 4246ab7..b417f55 100644
--- a/src/cairo.c
+++ b/src/cairo.c
@@ -122,9 +122,40 @@ _cairo_set_error (cairo_t *cr, cairo_status_t status)
_cairo_status_set_error (&cr->status, _cairo_error (status));
}
-#if HAS_ATOMIC_OPS
/* We keep a small stash of contexts to reduce malloc pressure */
#define CAIRO_STASH_SIZE 4
+#if CAIRO_NO_MUTEX
+static struct {
+ cairo_t pool[CAIRO_STASH_SIZE];
+ int occupied;
+} _context_stash;
+
+static cairo_t *
+_context_get (void)
+{
+ int avail;
+
+ avail = ffs (~_context_stash.occupied) - 1;
+ if (avail >= CAIRO_STASH_SIZE)
+ return malloc (sizeof (cairo_t));
+
+ _context_stash.occupied |= 1 << avail;
+ return &_context_stash.pool[avail];
+}
+
+static void
+_context_put (cairo_t *cr)
+{
+ if (cr < &_context_stash.pool[0] ||
+ cr >= &_context_stash.pool[CAIRO_STASH_SIZE])
+ {
+ free (cr);
+ return;
+ }
+
+ _context_stash.occupied &= ~(1 << (cr - &_context_stash.pool[0]));
+}
+#elif HAS_ATOMIC_OPS
static struct {
cairo_t pool[CAIRO_STASH_SIZE];
cairo_atomic_int_t occupied;
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