/* gmain.h - the GLib Main loop
* Copyright (C) 1998-2000 Red Hat, Inc.
*
* 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 .
*/
#ifndef __G_MAIN_H__
#define __G_MAIN_H__
#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only can be included directly."
#endif
#include
#include
#include
G_BEGIN_DECLS
typedef enum /*< flags >*/
{
G_IO_IN GLIB_SYSDEF_POLLIN,
G_IO_OUT GLIB_SYSDEF_POLLOUT,
G_IO_PRI GLIB_SYSDEF_POLLPRI,
G_IO_ERR GLIB_SYSDEF_POLLERR,
G_IO_HUP GLIB_SYSDEF_POLLHUP,
G_IO_NVAL GLIB_SYSDEF_POLLNVAL
} GIOCondition;
/**
* GMainContext:
*
* The `GMainContext` struct is an opaque data
* type representing a set of sources to be handled in a main loop.
*/
typedef struct _GMainContext GMainContext;
/**
* GMainLoop:
*
* The `GMainLoop` struct is an opaque data type
* representing the main event loop of a GLib or GTK+ application.
*/
typedef struct _GMainLoop GMainLoop;
/**
* GSource:
*
* The `GSource` struct is an opaque data type
* representing an event source.
*/
typedef struct _GSource GSource;
typedef struct _GSourcePrivate GSourcePrivate;
/**
* GSourceCallbackFuncs:
* @ref: Called when a reference is added to the callback object
* @unref: Called when a reference to the callback object is dropped
* @get: Called to extract the callback function and data from the
* callback object.
*
* The `GSourceCallbackFuncs` struct contains
* functions for managing callback objects.
*/
typedef struct _GSourceCallbackFuncs GSourceCallbackFuncs;
/**
* GSourceFuncs:
* @prepare: Called before all the file descriptors are polled. If the
* source can determine that it is ready here (without waiting for the
* results of the poll() call) it should return %TRUE. It can also return
* a @timeout_ value which should be the maximum timeout (in milliseconds)
* which should be passed to the poll() call. The actual timeout used will
* be -1 if all sources returned -1, or it will be the minimum of all
* the @timeout_ values returned which were >= 0. Since 2.36 this may
* be %NULL, in which case the effect is as if the function always returns
* %FALSE with a timeout of -1. If @prepare returns a
* timeout and the source also has a ready time set, then the
* lower of the two will be used.
* @check: Called after all the file descriptors are polled. The source
* should return %TRUE if it is ready to be dispatched. Note that some
* time may have passed since the previous prepare function was called,
* so the source should be checked again here. Since 2.36 this may
* be %NULL, in which case the effect is as if the function always returns
* %FALSE.
* @dispatch: Called to dispatch the event source, after it has returned
* %TRUE in either its @prepare or its @check function, or if a ready time
* has been reached. The @dispatch function receives a callback function and
* user data. The callback function may be %NULL if the source was never
* connected to a callback using g_source_set_callback(). The @dispatch
* function should call the callback function with @user_data and whatever
* additional parameters are needed for this type of event source. The
* return value of the @dispatch function should be #G_SOURCE_REMOVE if the
* source should be removed or #G_SOURCE_CONTINUE to keep it.
* @finalize: Called when the source is finalized. At this point, the source
* will have been destroyed, had its callback cleared, and have been removed
* from its #GMainContext, but it will still have its final reference count,
* so methods can be called on it from within this function.
*
* The `GSourceFuncs` struct contains a table of
* functions used to handle event sources in a generic manner.
*
* For idle sources, the prepare and check functions always return %TRUE
* to indicate that the source is always ready to be processed. The prepare
* function also returns a timeout value of 0 to ensure that the poll() call
* doesn't block (since that would be time wasted which could have been spent
* running the idle function).
*
* For timeout sources, the prepare and check functions both return %TRUE
* if the timeout interval has expired. The prepare function also returns
* a timeout value to ensure that the poll() call doesn't block too long
* and miss the next timeout.
*
* For file descriptor sources, the prepare function typically returns %FALSE,
* since it must wait until poll() has been called before it knows whether
* any events need to be processed. It sets the returned timeout to -1 to
* indicate that it doesn't mind how long the poll() call blocks. In the
* check function, it tests the results of the poll() call to see if the
* required condition has been met, and returns %TRUE if so.
*/
typedef struct _GSourceFuncs GSourceFuncs;
/**
* GPid:
*
* A type which is used to hold a process identification.
*
* On UNIX, processes are identified by a process id (an integer),
* while Windows uses process handles (which are pointers).
*
* GPid is used in GLib only for descendant processes spawned with
* the g_spawn functions.
*/
/* defined in glibconfig.h */
/**
* G_PID_FORMAT:
*
* A format specifier that can be used in printf()-style format strings
* when printing a #GPid.
*
* Since: 2.50
*/
/* defined in glibconfig.h */
/**
* GSourceFunc:
* @user_data: data passed to the function, set when the source was
* created with one of the above functions
*
* Specifies the type of function passed to g_timeout_add(),
* g_timeout_add_full(), g_idle_add(), and g_idle_add_full().
*
* When calling g_source_set_callback(), you may need to cast a function of a
* different type to this type. Use G_SOURCE_FUNC() to avoid warnings about
* incompatible function types.
*
* Returns: %FALSE if the source should be removed. #G_SOURCE_CONTINUE and
* #G_SOURCE_REMOVE are more memorable names for the return value.
*/
typedef gboolean (*GSourceFunc) (gpointer user_data);
/**
* G_SOURCE_FUNC:
* @f: a function pointer.
*
* Cast a function pointer to a #GSourceFunc, suppressing warnings from GCC 8
* onwards with `-Wextra` or `-Wcast-function-type` enabled about the function
* types being incompatible.
*
* For example, the correct type of callback for a source created by
* g_child_watch_source_new() is #GChildWatchFunc, which accepts more arguments
* than #GSourceFunc. Casting the function with `(GSourceFunc)` to call
* g_source_set_callback() will trigger a warning, even though it will be cast
* back to the correct type before it is called by the source.
*
* Since: 2.58
*/
#define G_SOURCE_FUNC(f) ((GSourceFunc) (void (*)(void)) (f))
/**
* GChildWatchFunc:
* @pid: the process id of the child process
* @status: Status information about the child process, encoded
* in a platform-specific manner
* @user_data: user data passed to g_child_watch_add()
*
* Prototype of a #GChildWatchSource callback, called when a child
* process has exited. To interpret @status, see the documentation
* for g_spawn_check_exit_status().
*/
typedef void (*GChildWatchFunc) (GPid pid,
gint status,
gpointer user_data);
struct _GSource
{
/*< private >*/
gpointer callback_data;
GSourceCallbackFuncs *callback_funcs;
const GSourceFuncs *source_funcs;
guint ref_count;
GMainContext *context;
gint priority;
guint flags;
guint source_id;
GSList *poll_fds;
GSource *prev;
GSource *next;
char *name;
GSourcePrivate *priv;
};
struct _GSourceCallbackFuncs
{
void (*ref) (gpointer cb_data);
void (*unref) (gpointer cb_data);
void (*get) (gpointer cb_data,
GSource *source,
GSourceFunc *func,
gpointer *data);
};
/**
* GSourceDummyMarshal:
*
* This is just a placeholder for #GClosureMarshal,
* which cannot be used here for dependency reasons.
*/
typedef void (*GSourceDummyMarshal) (void);
struct _GSourceFuncs
{
gboolean (*prepare) (GSource *source,
gint *timeout_);
gboolean (*check) (GSource *source);
gboolean (*dispatch) (GSource *source,
GSourceFunc callback,
gpointer user_data);
void (*finalize) (GSource *source); /* Can be NULL */
/*< private >*/
/* For use by g_source_set_closure */
GSourceFunc closure_callback;
GSourceDummyMarshal closure_marshal; /* Really is of type GClosureMarshal */
};
/* Standard priorities */
/**
* G_PRIORITY_HIGH:
*
* Use this for high priority event sources.
*
* It is not used within GLib or GTK+.
*/
#define G_PRIORITY_HIGH -100
/**
* G_PRIORITY_DEFAULT:
*
* Use this for default priority event sources.
*
* In GLib this priority is used when adding timeout functions
* with g_timeout_add(). In GDK this priority is used for events
* from the X server.
*/
#define G_PRIORITY_DEFAULT 0
/**
* G_PRIORITY_HIGH_IDLE:
*
* Use this for high priority idle functions.
*
* GTK+ uses #G_PRIORITY_HIGH_IDLE + 10 for resizing operations,
* and #G_PRIORITY_HIGH_IDLE + 20 for redrawing operations. (This is
* done to ensure that any pending resizes are processed before any
* pending redraws, so that widgets are not redrawn twice unnecessarily.)
*/
#define G_PRIORITY_HIGH_IDLE 100
/**
* G_PRIORITY_DEFAULT_IDLE:
*
* Use this for default priority idle functions.
*
* In GLib this priority is used when adding idle functions with
* g_idle_add().
*/
#define G_PRIORITY_DEFAULT_IDLE 200
/**
* G_PRIORITY_LOW:
*
* Use this for very low priority background tasks.
*
* It is not used within GLib or GTK+.
*/
#define G_PRIORITY_LOW 300
/**
* G_SOURCE_REMOVE:
*
* Use this macro as the return value of a #GSourceFunc to remove
* the #GSource from the main loop.
*
* Since: 2.32
*/
#define G_SOURCE_REMOVE FALSE
/**
* G_SOURCE_CONTINUE:
*
* Use this macro as the return value of a #GSourceFunc to leave
* the #GSource in the main loop.
*
* Since: 2.32
*/
#define G_SOURCE_CONTINUE TRUE
/* GMainContext: */
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_context_new (void);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_context_ref (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
void g_main_context_unref (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_context_default (void);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_iteration (GMainContext *context,
gboolean may_block);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_pending (GMainContext *context);
/* For implementation of legacy interfaces
*/
GLIB_AVAILABLE_IN_ALL
GSource *g_main_context_find_source_by_id (GMainContext *context,
guint source_id);
GLIB_AVAILABLE_IN_ALL
GSource *g_main_context_find_source_by_user_data (GMainContext *context,
gpointer user_data);
GLIB_AVAILABLE_IN_ALL
GSource *g_main_context_find_source_by_funcs_user_data (GMainContext *context,
GSourceFuncs *funcs,
gpointer user_data);
/* Low level functions for implementing custom main loops.
*/
GLIB_AVAILABLE_IN_ALL
void g_main_context_wakeup (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_acquire (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
void g_main_context_release (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_is_owner (GMainContext *context);
GLIB_DEPRECATED_IN_2_58_FOR(g_main_context_is_owner)
gboolean g_main_context_wait (GMainContext *context,
GCond *cond,
GMutex *mutex);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_prepare (GMainContext *context,
gint *priority);
GLIB_AVAILABLE_IN_ALL
gint g_main_context_query (GMainContext *context,
gint max_priority,
gint *timeout_,
GPollFD *fds,
gint n_fds);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_context_check (GMainContext *context,
gint max_priority,
GPollFD *fds,
gint n_fds);
GLIB_AVAILABLE_IN_ALL
void g_main_context_dispatch (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
void g_main_context_set_poll_func (GMainContext *context,
GPollFunc func);
GLIB_AVAILABLE_IN_ALL
GPollFunc g_main_context_get_poll_func (GMainContext *context);
/* Low level functions for use by source implementations
*/
GLIB_AVAILABLE_IN_ALL
void g_main_context_add_poll (GMainContext *context,
GPollFD *fd,
gint priority);
GLIB_AVAILABLE_IN_ALL
void g_main_context_remove_poll (GMainContext *context,
GPollFD *fd);
GLIB_AVAILABLE_IN_ALL
gint g_main_depth (void);
GLIB_AVAILABLE_IN_ALL
GSource *g_main_current_source (void);
/* GMainContexts for other threads
*/
GLIB_AVAILABLE_IN_ALL
void g_main_context_push_thread_default (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
void g_main_context_pop_thread_default (GMainContext *context);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_context_get_thread_default (void);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_context_ref_thread_default (void);
/* GMainLoop: */
GLIB_AVAILABLE_IN_ALL
GMainLoop *g_main_loop_new (GMainContext *context,
gboolean is_running);
GLIB_AVAILABLE_IN_ALL
void g_main_loop_run (GMainLoop *loop);
GLIB_AVAILABLE_IN_ALL
void g_main_loop_quit (GMainLoop *loop);
GLIB_AVAILABLE_IN_ALL
GMainLoop *g_main_loop_ref (GMainLoop *loop);
GLIB_AVAILABLE_IN_ALL
void g_main_loop_unref (GMainLoop *loop);
GLIB_AVAILABLE_IN_ALL
gboolean g_main_loop_is_running (GMainLoop *loop);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_main_loop_get_context (GMainLoop *loop);
/* GSource: */
GLIB_AVAILABLE_IN_ALL
GSource *g_source_new (GSourceFuncs *source_funcs,
guint struct_size);
GLIB_AVAILABLE_IN_ALL
GSource *g_source_ref (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_unref (GSource *source);
GLIB_AVAILABLE_IN_ALL
guint g_source_attach (GSource *source,
GMainContext *context);
GLIB_AVAILABLE_IN_ALL
void g_source_destroy (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_set_priority (GSource *source,
gint priority);
GLIB_AVAILABLE_IN_ALL
gint g_source_get_priority (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_set_can_recurse (GSource *source,
gboolean can_recurse);
GLIB_AVAILABLE_IN_ALL
gboolean g_source_get_can_recurse (GSource *source);
GLIB_AVAILABLE_IN_ALL
guint g_source_get_id (GSource *source);
GLIB_AVAILABLE_IN_ALL
GMainContext *g_source_get_context (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_set_callback (GSource *source,
GSourceFunc func,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
void g_source_set_funcs (GSource *source,
GSourceFuncs *funcs);
GLIB_AVAILABLE_IN_ALL
gboolean g_source_is_destroyed (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_set_name (GSource *source,
const char *name);
GLIB_AVAILABLE_IN_ALL
const char * g_source_get_name (GSource *source);
GLIB_AVAILABLE_IN_ALL
void g_source_set_name_by_id (guint tag,
const char *name);
GLIB_AVAILABLE_IN_2_36
void g_source_set_ready_time (GSource *source,
gint64 ready_time);
GLIB_AVAILABLE_IN_2_36
gint64 g_source_get_ready_time (GSource *source);
#ifdef G_OS_UNIX
GLIB_AVAILABLE_IN_2_36
gpointer g_source_add_unix_fd (GSource *source,
gint fd,
GIOCondition events);
GLIB_AVAILABLE_IN_2_36
void g_source_modify_unix_fd (GSource *source,
gpointer tag,
GIOCondition new_events);
GLIB_AVAILABLE_IN_2_36
void g_source_remove_unix_fd (GSource *source,
gpointer tag);
GLIB_AVAILABLE_IN_2_36
GIOCondition g_source_query_unix_fd (GSource *source,
gpointer tag);
#endif
/* Used to implement g_source_connect_closure and internally*/
GLIB_AVAILABLE_IN_ALL
void g_source_set_callback_indirect (GSource *source,
gpointer callback_data,
GSourceCallbackFuncs *callback_funcs);
GLIB_AVAILABLE_IN_ALL
void g_source_add_poll (GSource *source,
GPollFD *fd);
GLIB_AVAILABLE_IN_ALL
void g_source_remove_poll (GSource *source,
GPollFD *fd);
GLIB_AVAILABLE_IN_ALL
void g_source_add_child_source (GSource *source,
GSource *child_source);
GLIB_AVAILABLE_IN_ALL
void g_source_remove_child_source (GSource *source,
GSource *child_source);
GLIB_DEPRECATED_IN_2_28_FOR(g_source_get_time)
void g_source_get_current_time (GSource *source,
GTimeVal *timeval);
GLIB_AVAILABLE_IN_ALL
gint64 g_source_get_time (GSource *source);
/* void g_source_connect_closure (GSource *source,
GClosure *closure);
*/
/* Specific source types
*/
GLIB_AVAILABLE_IN_ALL
GSource *g_idle_source_new (void);
GLIB_AVAILABLE_IN_ALL
GSource *g_child_watch_source_new (GPid pid);
GLIB_AVAILABLE_IN_ALL
GSource *g_timeout_source_new (guint interval);
GLIB_AVAILABLE_IN_ALL
GSource *g_timeout_source_new_seconds (guint interval);
/* Miscellaneous functions
*/
GLIB_AVAILABLE_IN_ALL
void g_get_current_time (GTimeVal *result);
GLIB_AVAILABLE_IN_ALL
gint64 g_get_monotonic_time (void);
GLIB_AVAILABLE_IN_ALL
gint64 g_get_real_time (void);
/* Source manipulation by ID */
GLIB_AVAILABLE_IN_ALL
gboolean g_source_remove (guint tag);
GLIB_AVAILABLE_IN_ALL
gboolean g_source_remove_by_user_data (gpointer user_data);
GLIB_AVAILABLE_IN_ALL
gboolean g_source_remove_by_funcs_user_data (GSourceFuncs *funcs,
gpointer user_data);
/**
* GClearHandleFunc:
* @handle_id: the handle ID to clear
*
* Specifies the type of function passed to g_clear_handle_id().
* The implementation is expected to free the resource identified
* by @handle_id; for instance, if @handle_id is a #GSource ID,
* g_source_remove() can be used.
*
* Since: 2.56
*/
typedef void (* GClearHandleFunc) (guint handle_id);
GLIB_AVAILABLE_IN_2_56
void g_clear_handle_id (guint *tag_ptr,
GClearHandleFunc clear_func);
#define g_clear_handle_id(tag_ptr, clear_func) \
G_STMT_START { \
G_STATIC_ASSERT (sizeof *(tag_ptr) == sizeof (guint)); \
guint *_tag_ptr = (guint *) (tag_ptr); \
guint _handle_id; \
\
_handle_id = *_tag_ptr; \
if (_handle_id > 0) \
{ \
*_tag_ptr = 0; \
clear_func (_handle_id); \
} \
} G_STMT_END
/* Idles, child watchers and timeouts */
GLIB_AVAILABLE_IN_ALL
guint g_timeout_add_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
guint g_timeout_add (guint interval,
GSourceFunc function,
gpointer data);
GLIB_AVAILABLE_IN_ALL
guint g_timeout_add_seconds_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
guint g_timeout_add_seconds (guint interval,
GSourceFunc function,
gpointer data);
GLIB_AVAILABLE_IN_ALL
guint g_child_watch_add_full (gint priority,
GPid pid,
GChildWatchFunc function,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
guint g_child_watch_add (GPid pid,
GChildWatchFunc function,
gpointer data);
GLIB_AVAILABLE_IN_ALL
guint g_idle_add (GSourceFunc function,
gpointer data);
GLIB_AVAILABLE_IN_ALL
guint g_idle_add_full (gint priority,
GSourceFunc function,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
gboolean g_idle_remove_by_data (gpointer data);
GLIB_AVAILABLE_IN_ALL
void g_main_context_invoke_full (GMainContext *context,
gint priority,
GSourceFunc function,
gpointer data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
void g_main_context_invoke (GMainContext *context,
GSourceFunc function,
gpointer data);
/* Hook for GClosure / GSource integration. Don't touch */
GLIB_VAR GSourceFuncs g_timeout_funcs;
GLIB_VAR GSourceFuncs g_child_watch_funcs;
GLIB_VAR GSourceFuncs g_idle_funcs;
#ifdef G_OS_UNIX
GLIB_VAR GSourceFuncs g_unix_signal_funcs;
GLIB_VAR GSourceFuncs g_unix_fd_source_funcs;
#endif
G_END_DECLS
#endif /* __G_MAIN_H__ */