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cairo: stash a number of contexts for use with NO_MUTEX

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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.
This commit is contained in:
Chris Wilson 2010-05-06 17:21:59 +01:00
parent 91dfee420c
commit 506636e19e
1 changed files with 32 additions and 1 deletions
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33
src/cairo.c
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@ -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;