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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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/.
*/
#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#ifndef __G_THREAD_H__
#define __G_THREAD_H__
#include <glib/gerror.h>
#include <glib/gtypes.h>
#include <glib/gutils.h> /* for G_INLINE_FUNC */
#include <glib/gatomic.h> /* for g_atomic_pointer_get */
G_BEGIN_DECLS
/* GLib Thread support
*/
extern GQuark g_thread_error_quark (void);
#define G_THREAD_ERROR g_thread_error_quark ()
typedef enum
{
G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
} GThreadError;
typedef gpointer (*GThreadFunc) (gpointer data);
typedef enum
{
G_THREAD_PRIORITY_LOW,
G_THREAD_PRIORITY_NORMAL,
G_THREAD_PRIORITY_HIGH,
G_THREAD_PRIORITY_URGENT
} GThreadPriority;
typedef struct _GThread GThread;
struct _GThread
{
/*< private >*/
GThreadFunc func;
gpointer data;
gboolean joinable;
GThreadPriority priority;
};
typedef struct _GMutex GMutex;
typedef struct _GCond GCond;
typedef struct _GPrivate GPrivate;
typedef struct _GStaticPrivate GStaticPrivate;
typedef struct _GThreadFunctions GThreadFunctions;
struct _GThreadFunctions
{
GMutex* (*mutex_new) (void);
void (*mutex_lock) (GMutex *mutex);
gboolean (*mutex_trylock) (GMutex *mutex);
void (*mutex_unlock) (GMutex *mutex);
void (*mutex_free) (GMutex *mutex);
GCond* (*cond_new) (void);
void (*cond_signal) (GCond *cond);
void (*cond_broadcast) (GCond *cond);
void (*cond_wait) (GCond *cond,
GMutex *mutex);
gboolean (*cond_timed_wait) (GCond *cond,
GMutex *mutex,
GTimeVal *end_time);
void (*cond_free) (GCond *cond);
GPrivate* (*private_new) (GDestroyNotify destructor);
gpointer (*private_get) (GPrivate *private_key);
void (*private_set) (GPrivate *private_key,
gpointer data);
void (*thread_create) (GThreadFunc func,
gpointer data,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority,
gpointer thread,
GError **error);
void (*thread_yield) (void);
void (*thread_join) (gpointer thread);
void (*thread_exit) (void);
void (*thread_set_priority)(gpointer thread,
GThreadPriority priority);
void (*thread_self) (gpointer thread);
gboolean (*thread_equal) (gpointer thread1,
gpointer thread2);
};
GLIB_VAR GThreadFunctions g_thread_functions_for_glib_use;
GLIB_VAR gboolean g_thread_use_default_impl;
GLIB_VAR gboolean g_threads_got_initialized;
GLIB_VAR guint64 (*g_thread_gettime) (void);
/* initializes the mutex/cond/private implementation for glib, might
* only be called once, and must not be called directly or indirectly
* from another glib-function, e.g. as a callback.
*/
void g_thread_init (GThreadFunctions *vtable);
/* Errorcheck mutexes. If you define G_ERRORCHECK_MUTEXES, then all
* mutexes will check for re-locking and re-unlocking */
/* Initialize thread system with errorcheck mutexes. vtable must be
* NULL. Do not call directly. Use #define G_ERRORCHECK_MUTEXES
* instead.
*/
void g_thread_init_with_errorcheck_mutexes (GThreadFunctions* vtable);
/* Checks if thread support is initialized. Identical to the
* g_thread_supported macro but provided for language bindings.
*/
gboolean g_thread_get_initialized (void);
/* A random number to recognize debug calls to g_mutex_... */
#define G_MUTEX_DEBUG_MAGIC 0xf8e18ad7
#ifdef G_ERRORCHECK_MUTEXES
#define g_thread_init(vtable) g_thread_init_with_errorcheck_mutexes (vtable)
#endif
/* internal function for fallback static mutex implementation */
GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
#define g_static_mutex_get_mutex_impl_shortcut(mutex) \
(g_atomic_pointer_get (mutex) ? *(mutex) : \
g_static_mutex_get_mutex_impl (mutex))
/* shorthands for conditional and unconditional function calls */
#define G_THREAD_UF(op, arglist) \
(*g_thread_functions_for_glib_use . op) arglist
#define G_THREAD_CF(op, fail, arg) \
(g_thread_supported () ? G_THREAD_UF (op, arg) : (fail))
#define G_THREAD_ECF(op, fail, mutex, type) \
(g_thread_supported () ? \
((type(*)(GMutex*, const gulong, gchar const*)) \
(*g_thread_functions_for_glib_use . op)) \
(mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (fail))
#ifndef G_ERRORCHECK_MUTEXES
# define g_mutex_lock(mutex) \
G_THREAD_CF (mutex_lock, (void)0, (mutex))
# define g_mutex_trylock(mutex) \
G_THREAD_CF (mutex_trylock, TRUE, (mutex))
# define g_mutex_unlock(mutex) \
G_THREAD_CF (mutex_unlock, (void)0, (mutex))
# define g_mutex_free(mutex) \
G_THREAD_CF (mutex_free, (void)0, (mutex))
# define g_cond_wait(cond, mutex) \
G_THREAD_CF (cond_wait, (void)0, (cond, mutex))
# define g_cond_timed_wait(cond, mutex, abs_time) \
G_THREAD_CF (cond_timed_wait, TRUE, (cond, mutex, abs_time))
#else /* G_ERRORCHECK_MUTEXES */
# define g_mutex_lock(mutex) \
G_THREAD_ECF (mutex_lock, (void)0, (mutex), void)
# define g_mutex_trylock(mutex) \
G_THREAD_ECF (mutex_trylock, TRUE, (mutex), gboolean)
# define g_mutex_unlock(mutex) \
G_THREAD_ECF (mutex_unlock, (void)0, (mutex), void)
# define g_mutex_free(mutex) \
G_THREAD_ECF (mutex_free, (void)0, (mutex), void)
# define g_cond_wait(cond, mutex) \
(g_thread_supported () ? ((void(*)(GCond*, GMutex*, gulong, gchar*))\
g_thread_functions_for_glib_use.cond_wait) \
(cond, mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (void) 0)
# define g_cond_timed_wait(cond, mutex, abs_time) \
(g_thread_supported () ? \
((gboolean(*)(GCond*, GMutex*, GTimeVal*, gulong, gchar*)) \
g_thread_functions_for_glib_use.cond_timed_wait) \
(cond, mutex, abs_time, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : TRUE)
#endif /* G_ERRORCHECK_MUTEXES */
#if defined(G_THREADS_ENABLED) && defined(G_THREADS_MANDATORY)
#define g_thread_supported() 1
#else
#define g_thread_supported() (g_threads_got_initialized)
#endif
#define g_mutex_new() G_THREAD_UF (mutex_new, ())
#define g_cond_new() G_THREAD_UF (cond_new, ())
#define g_cond_signal(cond) G_THREAD_CF (cond_signal, (void)0, (cond))
#define g_cond_broadcast(cond) G_THREAD_CF (cond_broadcast, (void)0, (cond))
#define g_cond_free(cond) G_THREAD_CF (cond_free, (void)0, (cond))
#define g_private_new(destructor) G_THREAD_UF (private_new, (destructor))
#define g_private_get(private_key) G_THREAD_CF (private_get, \
((gpointer)private_key), \
(private_key))
#define g_private_set(private_key, value) G_THREAD_CF (private_set, \
(void) (private_key = \
(GPrivate*) (value)), \
(private_key, value))
#define g_thread_yield() G_THREAD_CF (thread_yield, (void)0, ())
#define g_thread_create(func, data, joinable, error) \
(g_thread_create_full (func, data, 0, joinable, FALSE, \
G_THREAD_PRIORITY_NORMAL, error))
GThread* g_thread_create_full (GThreadFunc func,
gpointer data,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority,
GError **error);
GThread* g_thread_self (void);
void g_thread_exit (gpointer retval);
gpointer g_thread_join (GThread *thread);
void g_thread_set_priority (GThread *thread,
GThreadPriority priority);
/* GStaticMutexes can be statically initialized with the value
* G_STATIC_MUTEX_INIT, and then they can directly be used, that is
* much easier, than having to explicitly allocate the mutex before
* use
*/
#define g_static_mutex_lock(mutex) \
g_mutex_lock (g_static_mutex_get_mutex (mutex))
#define g_static_mutex_trylock(mutex) \
g_mutex_trylock (g_static_mutex_get_mutex (mutex))
#define g_static_mutex_unlock(mutex) \
g_mutex_unlock (g_static_mutex_get_mutex (mutex))
void g_static_mutex_init (GStaticMutex *mutex);
void g_static_mutex_free (GStaticMutex *mutex);
struct _GStaticPrivate
{
/*< private >*/
guint index;
};
#define G_STATIC_PRIVATE_INIT { 0 }
void g_static_private_init (GStaticPrivate *private_key);
gpointer g_static_private_get (GStaticPrivate *private_key);
void g_static_private_set (GStaticPrivate *private_key,
gpointer data,
GDestroyNotify notify);
void g_static_private_free (GStaticPrivate *private_key);
typedef struct _GStaticRecMutex GStaticRecMutex;
struct _GStaticRecMutex
{
/*< private >*/
GStaticMutex mutex;
guint depth;
GSystemThread owner;
};
#define G_STATIC_REC_MUTEX_INIT { G_STATIC_MUTEX_INIT }
void g_static_rec_mutex_init (GStaticRecMutex *mutex);
void g_static_rec_mutex_lock (GStaticRecMutex *mutex);
gboolean g_static_rec_mutex_trylock (GStaticRecMutex *mutex);
void g_static_rec_mutex_unlock (GStaticRecMutex *mutex);
void g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
guint depth);
guint g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex);
void g_static_rec_mutex_free (GStaticRecMutex *mutex);
typedef struct _GStaticRWLock GStaticRWLock;
struct _GStaticRWLock
{
/*< private >*/
GStaticMutex mutex;
GCond *read_cond;
GCond *write_cond;
guint read_counter;
gboolean have_writer;
guint want_to_read;
guint want_to_write;
};
#define G_STATIC_RW_LOCK_INIT { G_STATIC_MUTEX_INIT, NULL, NULL, 0, FALSE, 0, 0 }
void g_static_rw_lock_init (GStaticRWLock* lock);
void g_static_rw_lock_reader_lock (GStaticRWLock* lock);
gboolean g_static_rw_lock_reader_trylock (GStaticRWLock* lock);
void g_static_rw_lock_reader_unlock (GStaticRWLock* lock);
void g_static_rw_lock_writer_lock (GStaticRWLock* lock);
gboolean g_static_rw_lock_writer_trylock (GStaticRWLock* lock);
void g_static_rw_lock_writer_unlock (GStaticRWLock* lock);
void g_static_rw_lock_free (GStaticRWLock* lock);
void g_thread_foreach (GFunc thread_func,
gpointer user_data);
typedef enum
{
G_ONCE_STATUS_NOTCALLED,
G_ONCE_STATUS_PROGRESS,
G_ONCE_STATUS_READY
} GOnceStatus;
typedef struct _GOnce GOnce;
struct _GOnce
{
volatile GOnceStatus status;
volatile gpointer retval;
};
#define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
#ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
# define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
#else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
# define g_once(once, func, arg) \
(((once)->status == G_ONCE_STATUS_READY) ? \
(once)->retval : \
g_once_impl ((once), (func), (arg)))
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
/* initialize-once guards, keyed by value_location */
G_INLINE_FUNC gboolean g_once_init_enter (volatile gsize *value_location);
gboolean g_once_init_enter_impl (volatile gsize *value_location);
void g_once_init_leave (volatile gsize *value_location,
gsize initialization_value);
#if defined (G_CAN_INLINE) || defined (__G_THREAD_C__)
G_INLINE_FUNC gboolean
g_once_init_enter (volatile gsize *value_location)
{
if G_LIKELY ((gpointer) g_atomic_pointer_get (value_location) != NULL)
return FALSE;
else
return g_once_init_enter_impl (value_location);
}
#endif /* G_CAN_INLINE || __G_THREAD_C__ */
/* these are some convenience macros that expand to nothing if GLib
* was configured with --disable-threads. for using StaticMutexes,
* you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)
* if you need to export the mutex. With G_LOCK_EXTERN (name) you can
* declare such an globally defined lock. name is a unique identifier
* for the protected varibale or code portion. locking, testing and
* unlocking of such mutexes can be done with G_LOCK(), G_UNLOCK() and
* G_TRYLOCK() respectively.
*/
extern void glib_dummy_decl (void);
#define G_LOCK_NAME(name) g__ ## name ## _lock
#ifdef G_THREADS_ENABLED
# define G_LOCK_DEFINE_STATIC(name) static G_LOCK_DEFINE (name)
# define G_LOCK_DEFINE(name) \
GStaticMutex G_LOCK_NAME (name) = G_STATIC_MUTEX_INIT
# define G_LOCK_EXTERN(name) extern GStaticMutex G_LOCK_NAME (name)
# ifdef G_DEBUG_LOCKS
# define G_LOCK(name) G_STMT_START{ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): locking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name); \
g_static_mutex_lock (&G_LOCK_NAME (name)); \
}G_STMT_END
# define G_UNLOCK(name) G_STMT_START{ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): unlocking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name); \
g_static_mutex_unlock (&G_LOCK_NAME (name)); \
}G_STMT_END
# define G_TRYLOCK(name) \
(g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): try locking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name), g_static_mutex_trylock (&G_LOCK_NAME (name)))
# else /* !G_DEBUG_LOCKS */
# define G_LOCK(name) g_static_mutex_lock (&G_LOCK_NAME (name))
# define G_UNLOCK(name) g_static_mutex_unlock (&G_LOCK_NAME (name))
# define G_TRYLOCK(name) g_static_mutex_trylock (&G_LOCK_NAME (name))
# endif /* !G_DEBUG_LOCKS */
#else /* !G_THREADS_ENABLED */
# define G_LOCK_DEFINE_STATIC(name) extern void glib_dummy_decl (void)
# define G_LOCK_DEFINE(name) extern void glib_dummy_decl (void)
# define G_LOCK_EXTERN(name) extern void glib_dummy_decl (void)
# define G_LOCK(name)
# define G_UNLOCK(name)
# define G_TRYLOCK(name) (TRUE)
#endif /* !G_THREADS_ENABLED */
G_END_DECLS
#endif /* __G_THREAD_H__ */ |
