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glib2.0/glib/ghook.c

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* GHook: Callback maintenance functions
* Copyright (C) 1998 Tim Janik
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
#include "ghook.h"
#include "gtestutils.h"
#include "gslice.h"
/**
* GHookList:
* @seq_id: the next free #GHook id
* @hook_size: the size of the #GHookList elements, in bytes
* @is_setup: 1 if the #GHookList has been initialized
* @hooks: the first #GHook element in the list
* @dummy3: unused
* @finalize_hook: the function to call to finalize a #GHook element.
* The default behaviour is to call the hooks @destroy function
* @dummy: unused
*
* The #GHookList struct represents a list of hook functions.
*/
/**
* GHookFinalizeFunc:
* @hook_list: a #GHookList
* @hook: the hook in @hook_list that gets finalized
*
* Defines the type of function to be called when a hook in a
* list of hooks gets finalized.
*/
/**
* GHookFlagMask:
* @G_HOOK_FLAG_ACTIVE: set if the hook has not been destroyed
* @G_HOOK_FLAG_IN_CALL: set if the hook is currently being run
* @G_HOOK_FLAG_MASK: A mask covering all bits reserved for
* hook flags; see %G_HOOK_FLAG_USER_SHIFT
*
* Flags used internally in the #GHook implementation.
*/
/**
* G_HOOK_FLAGS:
* @hook: a #GHook
*
* Gets the flags of a hook.
*/
/**
* G_HOOK_FLAG_USER_SHIFT:
*
* The position of the first bit which is not reserved for internal
* use be the #GHook implementation, i.e.
* `1 << G_HOOK_FLAG_USER_SHIFT` is the first
* bit which can be used for application-defined flags.
*/
/**
* G_HOOK:
* @hook: a pointer
*
* Casts a pointer to a `GHook*`.
*/
/**
* G_HOOK_IS_VALID:
* @hook: a #GHook
*
* Returns %TRUE if the #GHook is valid, i.e. it is in a #GHookList,
* it is active and it has not been destroyed.
*
* Returns: %TRUE if the #GHook is valid
*/
/**
* G_HOOK_ACTIVE:
* @hook: a #GHook
*
* Returns %TRUE if the #GHook is active, which is normally the case
* until the #GHook is destroyed.
*
* Returns: %TRUE if the #GHook is active
*/
/**
* G_HOOK_IN_CALL:
* @hook: a #GHook
*
* Returns %TRUE if the #GHook function is currently executing.
*
* Returns: %TRUE if the #GHook function is currently executing
*/
/**
* G_HOOK_IS_UNLINKED:
* @hook: a #GHook
*
* Returns %TRUE if the #GHook is not in a #GHookList.
*
* Returns: %TRUE if the #GHook is not in a #GHookList
*/
/**
* GHook:
* @data: data which is passed to func when this hook is invoked
* @next: pointer to the next hook in the list
* @prev: pointer to the previous hook in the list
* @ref_count: the reference count of this hook
* @hook_id: the id of this hook, which is unique within its list
* @flags: flags which are set for this hook. See #GHookFlagMask for
* predefined flags
* @func: the function to call when this hook is invoked. The possible
* signatures for this function are #GHookFunc and #GHookCheckFunc
* @destroy: the default @finalize_hook function of a #GHookList calls
* this member of the hook that is being finalized
*
* The #GHook struct represents a single hook function in a #GHookList.
*/
/**
* GHookFunc:
* @data: the data field of the #GHook is passed to the hook function here
*
* Defines the type of a hook function that can be invoked
* by g_hook_list_invoke().
*/
/**
* GHookCheckFunc:
* @data: the data field of the #GHook is passed to the hook function here
*
* Defines the type of a hook function that can be invoked
* by g_hook_list_invoke_check().
*
* Returns: %FALSE if the #GHook should be destroyed
*/
/* --- functions --- */
static void
default_finalize_hook (GHookList *hook_list,
GHook *hook)
{
GDestroyNotify destroy = hook->destroy;
if (destroy)
{
hook->destroy = NULL;
destroy (hook->data);
}
}
/**
* g_hook_list_init:
* @hook_list: a #GHookList
* @hook_size: the size of each element in the #GHookList,
* typically `sizeof (GHook)`.
*
* Initializes a #GHookList.
* This must be called before the #GHookList is used.
*/
void
g_hook_list_init (GHookList *hook_list,
guint hook_size)
{
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_size >= sizeof (GHook));
hook_list->seq_id = 1;
hook_list->hook_size = hook_size;
hook_list->is_setup = TRUE;
hook_list->hooks = NULL;
hook_list->dummy3 = NULL;
hook_list->finalize_hook = default_finalize_hook;
hook_list->dummy[0] = NULL;
hook_list->dummy[1] = NULL;
}
/**
* g_hook_list_clear:
* @hook_list: a #GHookList
*
* Removes all the #GHook elements from a #GHookList.
*/
void
g_hook_list_clear (GHookList *hook_list)
{
g_return_if_fail (hook_list != NULL);
if (hook_list->is_setup)
{
GHook *hook;
hook_list->is_setup = FALSE;
hook = hook_list->hooks;
if (!hook)
{
/* destroy hook_list->hook_memchunk */
}
else
do
{
GHook *tmp;
g_hook_ref (hook_list, hook);
g_hook_destroy_link (hook_list, hook);
tmp = hook->next;
g_hook_unref (hook_list, hook);
hook = tmp;
}
while (hook);
}
}
/**
* g_hook_alloc:
* @hook_list: a #GHookList
*
* Allocates space for a #GHook and initializes it.
*
* Returns: a new #GHook
*/
GHook*
g_hook_alloc (GHookList *hook_list)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (hook_list->is_setup, NULL);
hook = g_slice_alloc0 (hook_list->hook_size);
hook->data = NULL;
hook->next = NULL;
hook->prev = NULL;
hook->flags = G_HOOK_FLAG_ACTIVE;
hook->ref_count = 0;
hook->hook_id = 0;
hook->func = NULL;
hook->destroy = NULL;
return hook;
}
/**
* g_hook_free:
* @hook_list: a #GHookList
* @hook: the #GHook to free
*
* Calls the #GHookList @finalize_hook function if it exists,
* and frees the memory allocated for the #GHook.
*/
void
g_hook_free (GHookList *hook_list,
GHook *hook)
{
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
g_return_if_fail (hook != NULL);
g_return_if_fail (G_HOOK_IS_UNLINKED (hook));
g_return_if_fail (!G_HOOK_IN_CALL (hook));
if(hook_list->finalize_hook != NULL)
hook_list->finalize_hook (hook_list, hook);
g_slice_free1 (hook_list->hook_size, hook);
}
/**
* g_hook_destroy_link:
* @hook_list: a #GHookList
* @hook: the #GHook to remove
*
* Removes one #GHook from a #GHookList, marking it
* inactive and calling g_hook_unref() on it.
*/
void
g_hook_destroy_link (GHookList *hook_list,
GHook *hook)
{
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook != NULL);
hook->flags &= ~G_HOOK_FLAG_ACTIVE;
if (hook->hook_id)
{
hook->hook_id = 0;
g_hook_unref (hook_list, hook); /* counterpart to g_hook_insert_before */
}
}
/**
* g_hook_destroy:
* @hook_list: a #GHookList
* @hook_id: a hook ID
*
* Destroys a #GHook, given its ID.
*
* Returns: %TRUE if the #GHook was found in the #GHookList and destroyed
*/
gboolean
g_hook_destroy (GHookList *hook_list,
gulong hook_id)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, FALSE);
g_return_val_if_fail (hook_id > 0, FALSE);
hook = g_hook_get (hook_list, hook_id);
if (hook)
{
g_hook_destroy_link (hook_list, hook);
return TRUE;
}
return FALSE;
}
/**
* g_hook_unref:
* @hook_list: a #GHookList
* @hook: the #GHook to unref
*
* Decrements the reference count of a #GHook.
* If the reference count falls to 0, the #GHook is removed
* from the #GHookList and g_hook_free() is called to free it.
*/
void
g_hook_unref (GHookList *hook_list,
GHook *hook)
{
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook != NULL);
g_return_if_fail (hook->ref_count > 0);
hook->ref_count--;
if (!hook->ref_count)
{
g_return_if_fail (hook->hook_id == 0);
g_return_if_fail (!G_HOOK_IN_CALL (hook));
if (hook->prev)
hook->prev->next = hook->next;
else
hook_list->hooks = hook->next;
if (hook->next)
{
hook->next->prev = hook->prev;
hook->next = NULL;
}
hook->prev = NULL;
if (!hook_list->is_setup)
{
hook_list->is_setup = TRUE;
g_hook_free (hook_list, hook);
hook_list->is_setup = FALSE;
if (!hook_list->hooks)
{
/* destroy hook_list->hook_memchunk */
}
}
else
g_hook_free (hook_list, hook);
}
}
/**
* g_hook_ref:
* @hook_list: a #GHookList
* @hook: the #GHook to increment the reference count of
*
* Increments the reference count for a #GHook.
*
* Returns: the @hook that was passed in (since 2.6)
*/
GHook *
g_hook_ref (GHookList *hook_list,
GHook *hook)
{
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (hook != NULL, NULL);
g_return_val_if_fail (hook->ref_count > 0, NULL);
hook->ref_count++;
return hook;
}
/**
* g_hook_append:
* @hook_list: a #GHookList
* @hook: the #GHook to add to the end of @hook_list
*
* Appends a #GHook onto the end of a #GHookList.
*/
/**
* g_hook_prepend:
* @hook_list: a #GHookList
* @hook: the #GHook to add to the start of @hook_list
*
* Prepends a #GHook on the start of a #GHookList.
*/
void
g_hook_prepend (GHookList *hook_list,
GHook *hook)
{
g_return_if_fail (hook_list != NULL);
g_hook_insert_before (hook_list, hook_list->hooks, hook);
}
/**
* g_hook_insert_before:
* @hook_list: a #GHookList
* @sibling: (nullable): the #GHook to insert the new #GHook before
* @hook: the #GHook to insert
*
* Inserts a #GHook into a #GHookList, before a given #GHook.
*/
void
g_hook_insert_before (GHookList *hook_list,
GHook *sibling,
GHook *hook)
{
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
g_return_if_fail (hook != NULL);
g_return_if_fail (G_HOOK_IS_UNLINKED (hook));
g_return_if_fail (hook->ref_count == 0);
hook->hook_id = hook_list->seq_id++;
hook->ref_count = 1; /* counterpart to g_hook_destroy_link */
if (sibling)
{
if (sibling->prev)
{
hook->prev = sibling->prev;
hook->prev->next = hook;
hook->next = sibling;
sibling->prev = hook;
}
else
{
hook_list->hooks = hook;
hook->next = sibling;
sibling->prev = hook;
}
}
else
{
if (hook_list->hooks)
{
sibling = hook_list->hooks;
while (sibling->next)
sibling = sibling->next;
hook->prev = sibling;
sibling->next = hook;
}
else
hook_list->hooks = hook;
}
}
/**
* g_hook_list_invoke:
* @hook_list: a #GHookList
* @may_recurse: %TRUE if functions which are already running
* (e.g. in another thread) can be called. If set to %FALSE,
* these are skipped
*
* Calls all of the #GHook functions in a #GHookList.
*/
void
g_hook_list_invoke (GHookList *hook_list,
gboolean may_recurse)
{
GHook *hook;
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
hook = g_hook_first_valid (hook_list, may_recurse);
while (hook)
{
GHookFunc func;
gboolean was_in_call;
func = (GHookFunc) hook->func;
was_in_call = G_HOOK_IN_CALL (hook);
hook->flags |= G_HOOK_FLAG_IN_CALL;
func (hook->data);
if (!was_in_call)
hook->flags &= ~G_HOOK_FLAG_IN_CALL;
hook = g_hook_next_valid (hook_list, hook, may_recurse);
}
}
/**
* g_hook_list_invoke_check:
* @hook_list: a #GHookList
* @may_recurse: %TRUE if functions which are already running
* (e.g. in another thread) can be called. If set to %FALSE,
* these are skipped
*
* Calls all of the #GHook functions in a #GHookList.
* Any function which returns %FALSE is removed from the #GHookList.
*/
void
g_hook_list_invoke_check (GHookList *hook_list,
gboolean may_recurse)
{
GHook *hook;
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
hook = g_hook_first_valid (hook_list, may_recurse);
while (hook)
{
GHookCheckFunc func;
gboolean was_in_call;
gboolean need_destroy;
func = (GHookCheckFunc) hook->func;
was_in_call = G_HOOK_IN_CALL (hook);
hook->flags |= G_HOOK_FLAG_IN_CALL;
need_destroy = !func (hook->data);
if (!was_in_call)
hook->flags &= ~G_HOOK_FLAG_IN_CALL;
if (need_destroy)
g_hook_destroy_link (hook_list, hook);
hook = g_hook_next_valid (hook_list, hook, may_recurse);
}
}
/**
* GHookCheckMarshaller:
* @hook: a #GHook
* @marshal_data: user data
*
* Defines the type of function used by g_hook_list_marshal_check().
*
* Returns: %FALSE if @hook should be destroyed
*/
/**
* g_hook_list_marshal_check:
* @hook_list: a #GHookList
* @may_recurse: %TRUE if hooks which are currently running
* (e.g. in another thread) are considered valid. If set to %FALSE,
* these are skipped
* @marshaller: (scope call): the function to call for each #GHook
* @marshal_data: data to pass to @marshaller
*
* Calls a function on each valid #GHook and destroys it if the
* function returns %FALSE.
*/
void
g_hook_list_marshal_check (GHookList *hook_list,
gboolean may_recurse,
GHookCheckMarshaller marshaller,
gpointer data)
{
GHook *hook;
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
g_return_if_fail (marshaller != NULL);
hook = g_hook_first_valid (hook_list, may_recurse);
while (hook)
{
gboolean was_in_call;
gboolean need_destroy;
was_in_call = G_HOOK_IN_CALL (hook);
hook->flags |= G_HOOK_FLAG_IN_CALL;
need_destroy = !marshaller (hook, data);
if (!was_in_call)
hook->flags &= ~G_HOOK_FLAG_IN_CALL;
if (need_destroy)
g_hook_destroy_link (hook_list, hook);
hook = g_hook_next_valid (hook_list, hook, may_recurse);
}
}
/**
* GHookMarshaller:
* @hook: a #GHook
* @marshal_data: user data
*
* Defines the type of function used by g_hook_list_marshal().
*/
/**
* g_hook_list_marshal:
* @hook_list: a #GHookList
* @may_recurse: %TRUE if hooks which are currently running
* (e.g. in another thread) are considered valid. If set to %FALSE,
* these are skipped
* @marshaller: (scope call): the function to call for each #GHook
* @marshal_data: data to pass to @marshaller
*
* Calls a function on each valid #GHook.
*/
void
g_hook_list_marshal (GHookList *hook_list,
gboolean may_recurse,
GHookMarshaller marshaller,
gpointer data)
{
GHook *hook;
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
g_return_if_fail (marshaller != NULL);
hook = g_hook_first_valid (hook_list, may_recurse);
while (hook)
{
gboolean was_in_call;
was_in_call = G_HOOK_IN_CALL (hook);
hook->flags |= G_HOOK_FLAG_IN_CALL;
marshaller (hook, data);
if (!was_in_call)
hook->flags &= ~G_HOOK_FLAG_IN_CALL;
hook = g_hook_next_valid (hook_list, hook, may_recurse);
}
}
/**
* g_hook_first_valid:
* @hook_list: a #GHookList
* @may_be_in_call: %TRUE if hooks which are currently running
* (e.g. in another thread) are considered valid. If set to %FALSE,
* these are skipped
*
* Returns the first #GHook in a #GHookList which has not been destroyed.
* The reference count for the #GHook is incremented, so you must call
* g_hook_unref() to restore it when no longer needed. (Or call
* g_hook_next_valid() if you are stepping through the #GHookList.)
*
* Returns: the first valid #GHook, or %NULL if none are valid
*/
GHook*
g_hook_first_valid (GHookList *hook_list,
gboolean may_be_in_call)
{
g_return_val_if_fail (hook_list != NULL, NULL);
if (hook_list->is_setup)
{
GHook *hook;
hook = hook_list->hooks;
if (hook)
{
g_hook_ref (hook_list, hook);
if (G_HOOK_IS_VALID (hook) && (may_be_in_call || !G_HOOK_IN_CALL (hook)))
return hook;
else
return g_hook_next_valid (hook_list, hook, may_be_in_call);
}
}
return NULL;
}
/**
* g_hook_next_valid:
* @hook_list: a #GHookList
* @hook: the current #GHook
* @may_be_in_call: %TRUE if hooks which are currently running
* (e.g. in another thread) are considered valid. If set to %FALSE,
* these are skipped
*
* Returns the next #GHook in a #GHookList which has not been destroyed.
* The reference count for the #GHook is incremented, so you must call
* g_hook_unref() to restore it when no longer needed. (Or continue to call
* g_hook_next_valid() until %NULL is returned.)
*
* Returns: the next valid #GHook, or %NULL if none are valid
*/
GHook*
g_hook_next_valid (GHookList *hook_list,
GHook *hook,
gboolean may_be_in_call)
{
GHook *ohook = hook;
g_return_val_if_fail (hook_list != NULL, NULL);
if (!hook)
return NULL;
hook = hook->next;
while (hook)
{
if (G_HOOK_IS_VALID (hook) && (may_be_in_call || !G_HOOK_IN_CALL (hook)))
{
g_hook_ref (hook_list, hook);
g_hook_unref (hook_list, ohook);
return hook;
}
hook = hook->next;
}
g_hook_unref (hook_list, ohook);
return NULL;
}
/**
* g_hook_get:
* @hook_list: a #GHookList
* @hook_id: a hook id
*
* Returns the #GHook with the given id, or %NULL if it is not found.
*
* Returns: the #GHook with the given id, or %NULL if it is not found
*/
GHook*
g_hook_get (GHookList *hook_list,
gulong hook_id)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (hook_id > 0, NULL);
hook = hook_list->hooks;
while (hook)
{
if (hook->hook_id == hook_id)
return hook;
hook = hook->next;
}
return NULL;
}
/**
* GHookFindFunc:
* @hook: a #GHook
* @data: user data passed to g_hook_find_func()
*
* Defines the type of the function passed to g_hook_find().
*
* Returns: %TRUE if the required #GHook has been found
*/
/**
* g_hook_find:
* @hook_list: a #GHookList
* @need_valids: %TRUE if #GHook elements which have been destroyed
* should be skipped
* @func: (scope call): the function to call for each #GHook, which should return
* %TRUE when the #GHook has been found
* @data: the data to pass to @func
*
* Finds a #GHook in a #GHookList using the given function to
* test for a match.
*
* Returns: the found #GHook or %NULL if no matching #GHook is found
*/
GHook*
g_hook_find (GHookList *hook_list,
gboolean need_valids,
GHookFindFunc func,
gpointer data)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (func != NULL, NULL);
hook = hook_list->hooks;
while (hook)
{
GHook *tmp;
/* test only non-destroyed hooks */
if (!hook->hook_id)
{
hook = hook->next;
continue;
}
g_hook_ref (hook_list, hook);
if (func (hook, data) && hook->hook_id && (!need_valids || G_HOOK_ACTIVE (hook)))
{
g_hook_unref (hook_list, hook);
return hook;
}
tmp = hook->next;
g_hook_unref (hook_list, hook);
hook = tmp;
}
return NULL;
}
/**
* g_hook_find_data:
* @hook_list: a #GHookList
* @need_valids: %TRUE if #GHook elements which have been destroyed
* should be skipped
* @data: the data to find
*
* Finds a #GHook in a #GHookList with the given data.
*
* Returns: the #GHook with the given @data or %NULL if no matching
* #GHook is found
*/
GHook*
g_hook_find_data (GHookList *hook_list,
gboolean need_valids,
gpointer data)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
hook = hook_list->hooks;
while (hook)
{
/* test only non-destroyed hooks */
if (hook->data == data &&
hook->hook_id &&
(!need_valids || G_HOOK_ACTIVE (hook)))
return hook;
hook = hook->next;
}
return NULL;
}
/**
* g_hook_find_func:
* @hook_list: a #GHookList
* @need_valids: %TRUE if #GHook elements which have been destroyed
* should be skipped
* @func: the function to find
*
* Finds a #GHook in a #GHookList with the given function.
*
* Returns: the #GHook with the given @func or %NULL if no matching
* #GHook is found
*/
GHook*
g_hook_find_func (GHookList *hook_list,
gboolean need_valids,
gpointer func)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (func != NULL, NULL);
hook = hook_list->hooks;
while (hook)
{
/* test only non-destroyed hooks */
if (hook->func == func &&
hook->hook_id &&
(!need_valids || G_HOOK_ACTIVE (hook)))
return hook;
hook = hook->next;
}
return NULL;
}
/**
* g_hook_find_func_data:
* @hook_list: a #GHookList
* @need_valids: %TRUE if #GHook elements which have been destroyed
* should be skipped
* @func: (not nullable): the function to find
* @data: the data to find
*
* Finds a #GHook in a #GHookList with the given function and data.
*
* Returns: the #GHook with the given @func and @data or %NULL if
* no matching #GHook is found
*/
GHook*
g_hook_find_func_data (GHookList *hook_list,
gboolean need_valids,
gpointer func,
gpointer data)
{
GHook *hook;
g_return_val_if_fail (hook_list != NULL, NULL);
g_return_val_if_fail (func != NULL, NULL);
hook = hook_list->hooks;
while (hook)
{
/* test only non-destroyed hooks */
if (hook->data == data &&
hook->func == func &&
hook->hook_id &&
(!need_valids || G_HOOK_ACTIVE (hook)))
return hook;
hook = hook->next;
}
return NULL;
}
/**
* GHookCompareFunc:
* @new_hook: the #GHook being inserted
* @sibling: the #GHook to compare with @new_hook
*
* Defines the type of function used to compare #GHook elements in
* g_hook_insert_sorted().
*
* Returns: a value <= 0 if @new_hook should be before @sibling
*/
/**
* g_hook_insert_sorted:
* @hook_list: a #GHookList
* @hook: the #GHook to insert
* @func: (scope call): the comparison function used to sort the #GHook elements
*
* Inserts a #GHook into a #GHookList, sorted by the given function.
*/
void
g_hook_insert_sorted (GHookList *hook_list,
GHook *hook,
GHookCompareFunc func)
{
GHook *sibling;
g_return_if_fail (hook_list != NULL);
g_return_if_fail (hook_list->is_setup);
g_return_if_fail (hook != NULL);
g_return_if_fail (G_HOOK_IS_UNLINKED (hook));
g_return_if_fail (hook->func != NULL);
g_return_if_fail (func != NULL);
/* first non-destroyed hook */
sibling = hook_list->hooks;
while (sibling && !sibling->hook_id)
sibling = sibling->next;
while (sibling)
{
GHook *tmp;
g_hook_ref (hook_list, sibling);
if (func (hook, sibling) <= 0 && sibling->hook_id)
{
g_hook_unref (hook_list, sibling);
break;
}
/* next non-destroyed hook */
tmp = sibling->next;
while (tmp && !tmp->hook_id)
tmp = tmp->next;
g_hook_unref (hook_list, sibling);
sibling = tmp;
}
g_hook_insert_before (hook_list, sibling, hook);
}
/**
* g_hook_compare_ids:
* @new_hook: a #GHook
* @sibling: a #GHook to compare with @new_hook
*
* Compares the ids of two #GHook elements, returning a negative value
* if the second id is greater than the first.
*
* Returns: a value <= 0 if the id of @sibling is >= the id of @new_hook
*/
gint
g_hook_compare_ids (GHook *new_hook,
GHook *sibling)
{
if (new_hook->hook_id < sibling->hook_id)
return -1;
else if (new_hook->hook_id > sibling->hook_id)
return 1;
return 0;
}
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