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shm: Split pool reference counting into external and internal references

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This is a preliminary step towards deferring shm resize operations until
after the compositor has released all external references on a pool.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
This commit is contained in:
Derek Foreman 2016-02-09 16:03:47 -06:00 • committed by Bryce Harrington
parent 5fe7e7ca78
commit 442f443586
1 changed files with 19 additions and 12 deletions
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31
src/wayland-shm.c
View file

@ -52,7 +52,8 @@ static struct sigaction wl_shm_old_sigbus_action;
struct wl_shm_pool {
struct wl_resource *resource;
int refcount;
int internal_refcount;
int external_refcount;
char *data;
int32_t size;
};
@ -73,10 +74,14 @@ struct wl_shm_sigbus_data {
};
static void
shm_pool_unref(struct wl_shm_pool *pool)
shm_pool_unref(struct wl_shm_pool *pool, bool external)
{
pool->refcount--;
if (pool->refcount)
if (external)
pool->external_refcount--;
else
pool->internal_refcount--;
if (pool->internal_refcount + pool->external_refcount)
return;
munmap(pool->data, pool->size);
@ -89,7 +94,7 @@ destroy_buffer(struct wl_resource *resource)
struct wl_shm_buffer *buffer = wl_resource_get_user_data(resource);
if (buffer->pool)
shm_pool_unref(buffer->pool);
shm_pool_unref(buffer->pool, false);
free(buffer);
}
@ -162,13 +167,13 @@ shm_pool_create_buffer(struct wl_client *client, struct wl_resource *resource,
buffer->stride = stride;
buffer->offset = offset;
buffer->pool = pool;
pool->refcount++;
pool->internal_refcount++;
buffer->resource =
wl_resource_create(client, &wl_buffer_interface, 1, id);
if (buffer->resource == NULL) {
wl_client_post_no_memory(client);
shm_pool_unref(pool);
shm_pool_unref(pool, false);
free(buffer);
return;
}
@ -183,7 +188,7 @@ destroy_pool(struct wl_resource *resource)
{
struct wl_shm_pool *pool = wl_resource_get_user_data(resource);
shm_pool_unref(pool);
shm_pool_unref(pool, false);
}
static void
@ -243,7 +248,8 @@ shm_create_pool(struct wl_client *client, struct wl_resource *resource,
goto err_close;
}
pool->refcount = 1;
pool->internal_refcount = 1;
pool->external_refcount = 0;
pool->size = size;
pool->data = mmap(NULL, size,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
@ -396,9 +402,10 @@ wl_shm_buffer_get_height(struct wl_shm_buffer *buffer)
WL_EXPORT struct wl_shm_pool *
wl_shm_buffer_ref_pool(struct wl_shm_buffer *buffer)
{
assert(buffer->pool->refcount);
assert(buffer->pool->internal_refcount +
buffer->pool->external_refcount);
buffer->pool->refcount++;
buffer->pool->external_refcount++;
return buffer->pool;
}
@ -418,7 +425,7 @@ wl_shm_buffer_ref_pool(struct wl_shm_buffer *buffer)
WL_EXPORT void
wl_shm_pool_unref(struct wl_shm_pool *pool)
{
shm_pool_unref(pool);
shm_pool_unref(pool, true);
}
static void