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gmain: Officially deprecate g_main_context_wait()

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It’s been de-facto deprecated for a long time, due to emitting a
critical warning when used in a non-internal context. Make that official
in the documentation and with a deprecation annotation.

Split the implementation into an internal helper and an external
wrapper, so the two remaining internal uses don’t emit deprecation
warnings.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/glib/issues/903
This commit is contained in:
Philip Withnall 2018-05-16 10:42:21 +01:00
parent cbfa776fc1
commit 7a34e396ae
2 changed files with 53 additions and 41 deletions
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92
glib/gmain.c
View File

@ -3307,25 +3307,10 @@ g_main_context_release (GMainContext *context)
UNLOCK_CONTEXT (context);
}
/**
* g_main_context_wait:
* @context: a #GMainContext
* @cond: a condition variable
* @mutex: a mutex, currently held
*
* Tries to become the owner of the specified context,
* as with g_main_context_acquire(). But if another thread
* is the owner, atomically drop @mutex and wait on @cond until
* that owner releases ownership or until @cond is signaled, then
* try again (once) to become the owner.
*
* Returns: %TRUE if the operation succeeded, and
* this thread is now the owner of @context.
**/
gboolean
g_main_context_wait (GMainContext *context,
GCond *cond,
GMutex *mutex)
static gboolean
g_main_context_wait_internal (GMainContext *context,
GCond *cond,
GMutex *mutex)
{
gboolean result = FALSE;
GThread *self = G_THREAD_SELF;
@ -3334,18 +3319,6 @@ g_main_context_wait (GMainContext *context,
if (context == NULL)
context = g_main_context_default ();
if G_UNLIKELY (cond != &context->cond || mutex != &context->mutex)
{
static gboolean warned;
if (!warned)
{
g_critical ("WARNING!! g_main_context_wait() will be removed in a future release. "
"If you see this message, please file a bug immediately.");
warned = TRUE;
}
}
loop_internal_waiter = (mutex == &context->mutex);
if (!loop_internal_waiter)
@ -3361,10 +3334,10 @@ g_main_context_wait (GMainContext *context,
context->waiters = g_slist_append (context->waiters, &waiter);
if (!loop_internal_waiter)
UNLOCK_CONTEXT (context);
UNLOCK_CONTEXT (context);
g_cond_wait (cond, mutex);
if (!loop_internal_waiter)
LOCK_CONTEXT (context);
if (!loop_internal_waiter)
LOCK_CONTEXT (context);
context->waiters = g_slist_remove (context->waiters, &waiter);
}
@ -3387,6 +3360,45 @@ g_main_context_wait (GMainContext *context,
return result;
}
/**
* g_main_context_wait:
* @context: a #GMainContext
* @cond: a condition variable
* @mutex: a mutex, currently held
*
* Tries to become the owner of the specified context,
* as with g_main_context_acquire(). But if another thread
* is the owner, atomically drop @mutex and wait on @cond until
* that owner releases ownership or until @cond is signaled, then
* try again (once) to become the owner.
*
* Returns: %TRUE if the operation succeeded, and
* this thread is now the owner of @context.
* Deprecated: 2.58: Use g_main_context_is_owner() and separate locking instead.
*/
gboolean
g_main_context_wait (GMainContext *context,
GCond *cond,
GMutex *mutex)
{
if (context == NULL)
context = g_main_context_default ();
if (G_UNLIKELY (cond != &context->cond || mutex != &context->mutex))
{
static gboolean warned;
if (!warned)
{
g_critical ("WARNING!! g_main_context_wait() will be removed in a future release. "
"If you see this message, please file a bug immediately.");
warned = TRUE;
}
}
return g_main_context_wait_internal (context, cond, mutex);
}
/**
* g_main_context_prepare:
* @context: a #GMainContext
@ -3864,9 +3876,9 @@ g_main_context_iterate (GMainContext *context,
if (!block)
return FALSE;
got_ownership = g_main_context_wait (context,
&context->cond,
&context->mutex);
got_ownership = g_main_context_wait_internal (context,
&context->cond,
&context->mutex);
if (!got_ownership)
return FALSE;
@ -4073,9 +4085,9 @@ g_main_loop_run (GMainLoop *loop)
loop->is_running = TRUE;
while (loop->is_running && !got_ownership)
got_ownership = g_main_context_wait (loop->context,
&loop->context->cond,
&loop->context->mutex);
got_ownership = g_main_context_wait_internal (loop->context,
&loop->context->cond,
&loop->context->mutex);
if (!loop->is_running)
{

2
glib/gmain.h
View File

@ -376,7 +376,7 @@ GLIB_AVAILABLE_IN_ALL
void g_main_context_release (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_is_owner (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
GLIB_DEPRECATED_IN_2_58_FOR(g_main_context_is_owner)
gboolean g_main_context_wait (GMainContext *context,
GCond *cond,
GMutex *mutex);