mirror of
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332 lines
15 KiB
C
332 lines
15 KiB
C
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/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_THREAD_H__
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#define __G_THREAD_H__
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#include <gerror.h>
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#include <gmain.h>
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G_BEGIN_DECLS
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#ifndef GLIB_VAR
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# ifdef G_OS_WIN32
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# ifdef GLIB_COMPILATION
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# define GLIB_VAR __declspec(dllexport)
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# else /* !GLIB_COMPILATION */
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# define GLIB_VAR extern __declspec(dllimport)
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# endif /* !GLIB_COMPILATION */
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# else /* !G_OS_WIN32 */
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# define GLIB_VAR extern
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# endif /* !G_OS_WIN32 */
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#endif /* GLIB_VAR */
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/* GLib Thread support
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*/
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extern GQuark g_thread_error_quark();
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#define G_THREAD_ERROR g_thread_error_quark()
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typedef enum
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{
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G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
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} GThreadError;
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typedef void (*GThreadFunc) (gpointer value);
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typedef enum
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{
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G_THREAD_PRIORITY_LOW,
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G_THREAD_PRIORITY_NORMAL,
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G_THREAD_PRIORITY_HIGH,
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G_THREAD_PRIORITY_URGENT
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} GThreadPriority;
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typedef struct _GThread GThread;
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struct _GThread
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{
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GThreadPriority priority;
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gboolean bound;
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gboolean joinable;
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};
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typedef struct _GMutex GMutex;
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typedef struct _GCond GCond;
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typedef struct _GPrivate GPrivate;
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typedef struct _GStaticPrivate GStaticPrivate;
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typedef struct _GThreadFunctions GThreadFunctions;
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struct _GThreadFunctions
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{
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GMutex* (*mutex_new) (void);
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void (*mutex_lock) (GMutex *mutex);
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gboolean (*mutex_trylock) (GMutex *mutex);
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void (*mutex_unlock) (GMutex *mutex);
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void (*mutex_free) (GMutex *mutex);
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GCond* (*cond_new) (void);
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void (*cond_signal) (GCond *cond);
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void (*cond_broadcast) (GCond *cond);
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void (*cond_wait) (GCond *cond,
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GMutex *mutex);
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gboolean (*cond_timed_wait) (GCond *cond,
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GMutex *mutex,
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GTimeVal *end_time);
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void (*cond_free) (GCond *cond);
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GPrivate* (*private_new) (GDestroyNotify destructor);
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gpointer (*private_get) (GPrivate *private_key);
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void (*private_set) (GPrivate *private_key,
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gpointer data);
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void (*thread_create) (GThreadFunc thread_func,
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gpointer arg,
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gulong stack_size,
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gboolean joinable,
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gboolean bound,
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GThreadPriority priority,
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gpointer thread,
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GError **error);
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void (*thread_yield) (void);
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void (*thread_join) (gpointer thread);
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void (*thread_exit) (void);
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void (*thread_set_priority)(gpointer thread,
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GThreadPriority priority);
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void (*thread_self) (gpointer thread);
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};
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GLIB_VAR GThreadFunctions g_thread_functions_for_glib_use;
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GLIB_VAR gboolean g_thread_use_default_impl;
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GLIB_VAR gboolean g_threads_got_initialized;
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/* initializes the mutex/cond/private implementation for glib, might
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* only be called once, and must not be called directly or indirectly
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* from another glib-function, e.g. as a callback.
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*/
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void g_thread_init (GThreadFunctions *vtable);
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/* Errorcheck mutexes. If you define G_ERRORCHECK_MUTEXES, then all
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* mutexes will check for re-locking and re-unlocking */
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/* Initialize thread system with errorcheck mutexes. vtable must be
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* NULL.Do not call directly. Use #define G_ERRORCHECK_MUTEXES
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* instead.
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*/
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void g_thread_init_with_errorcheck_mutexes (GThreadFunctions* vtable);
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/* A random number to recognize debug calls to g_mutex_... */
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#define G_MUTEX_DEBUG_MAGIC 0xf8e18ad7
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#ifdef G_ERRORCHECK_MUTEXES
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#define g_thread_init(vtable) g_thread_init_with_errorcheck_mutexes (vtable)
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#endif
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/* internal function for fallback static mutex implementation */
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GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
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/* shorthands for conditional and unconditional function calls */
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#define G_THREAD_UF(op, arglist) \
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(*g_thread_functions_for_glib_use . op) arglist
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#define G_THREAD_CF(op, fail, arg) \
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(g_thread_supported () ? G_THREAD_UF (op, arg) : (fail))
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#define G_THREAD_ECF(op, fail, mutex, name, type) \
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(g_thread_supported () ? \
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((type(*)(GMutex*, gulong, gchar*, gchar*)) \
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(*g_thread_functions_for_glib_use . op)) \
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(mutex, G_MUTEX_DEBUG_MAGIC, G_STRINGIFY (name), G_STRLOC) : (fail))
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#ifndef G_ERRORCHECK_MUTEXES
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#define g_mutex_lock_with_debug_name(mutex, name) \
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G_THREAD_CF (mutex_lock, (void)0, (mutex))
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#define g_mutex_trylock_with_debug_name(mutex, name) \
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G_THREAD_CF (mutex_trylock, TRUE, (mutex))
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#define g_mutex_unlock_with_debug_name(mutex, name) \
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G_THREAD_CF (mutex_unlock, (void)0, (mutex))
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#else /* G_ERRORCHECK_MUTEXES */
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#define g_mutex_lock_with_debug_name(mutex, name) \
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G_THREAD_ECF (mutex_lock, (void)0, mutex, name, void)
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#define g_mutex_trylock_with_debug_name(mutex, name) \
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G_THREAD_ECF (mutex_trylock, TRUE, mutex, name, gboolean)
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#define g_mutex_unlock_with_debug_name(mutex, name) \
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G_THREAD_ECF (mutex_unlock, (void)0, mutex, name, void)
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#endif /* G_ERRORCHECK_MUTEXES */
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#define g_thread_supported() (g_threads_got_initialized)
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#define g_mutex_new() G_THREAD_UF (mutex_new, ())
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#define g_mutex_lock(mutex) g_mutex_lock_with_debug_name(mutex, mutex)
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#define g_mutex_trylock(mutex) g_mutex_trylock_with_debug_name(mutex, mutex)
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#define g_mutex_unlock(mutex) g_mutex_unlock_with_debug_name(mutex, mutex)
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#define g_mutex_free(mutex) G_THREAD_CF (mutex_free, (void)0, (mutex))
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#define g_cond_new() G_THREAD_UF (cond_new, ())
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#define g_cond_signal(cond) G_THREAD_CF (cond_signal, (void)0, (cond))
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#define g_cond_broadcast(cond) G_THREAD_CF (cond_broadcast, (void)0, (cond))
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#define g_cond_wait(cond, mutex) G_THREAD_CF (cond_wait, (void)0, (cond, \
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mutex))
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#define g_cond_free(cond) G_THREAD_CF (cond_free, (void)0, (cond))
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#define g_cond_timed_wait(cond, mutex, abs_time) G_THREAD_CF (cond_timed_wait, \
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TRUE, \
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(cond, mutex, \
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abs_time))
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#define g_private_new(destructor) G_THREAD_UF (private_new, (destructor))
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#define g_private_get(private_key) G_THREAD_CF (private_get, \
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((gpointer)private_key), \
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(private_key))
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#define g_private_set(private_key, value) G_THREAD_CF (private_set, \
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(void) (private_key = \
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(GPrivate*) (value)), \
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(private_key, value))
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#define g_thread_yield() G_THREAD_CF (thread_yield, (void)0, ())
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#define g_thread_exit() G_THREAD_CF (thread_exit, (void)0, ())
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GThread* g_thread_create (GThreadFunc thread_func,
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gpointer arg,
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gulong stack_size,
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gboolean joinable,
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gboolean bound,
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GThreadPriority priority,
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GError **error);
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GThread* g_thread_self ();
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void g_thread_join (GThread *thread);
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void g_thread_set_priority (GThread *thread,
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GThreadPriority priority);
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/* GStaticMutexes can be statically initialized with the value
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* G_STATIC_MUTEX_INIT, and then they can directly be used, that is
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* much easier, than having to explicitly allocate the mutex before
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* use
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*/
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#define g_static_mutex_lock(mutex) \
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g_mutex_lock_with_debug_name (g_static_mutex_get_mutex (mutex), mutex)
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#define g_static_mutex_trylock(mutex) \
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g_mutex_trylock_with_debug_name (g_static_mutex_get_mutex (mutex), mutex)
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#define g_static_mutex_unlock(mutex) \
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g_mutex_unlock_with_debug_name (g_static_mutex_get_mutex (mutex), mutex)
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struct _GStaticPrivate
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{
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guint index;
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};
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#define G_STATIC_PRIVATE_INIT { 0 }
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gpointer g_static_private_get (GStaticPrivate *private_key);
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void g_static_private_set (GStaticPrivate *private_key,
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gpointer data,
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GDestroyNotify notify);
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gpointer g_static_private_get_for_thread (GStaticPrivate *private_key,
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GThread *thread);
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void g_static_private_set_for_thread (GStaticPrivate *private_key,
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GThread *thread,
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gpointer data,
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GDestroyNotify notify);
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typedef struct _GStaticRecMutex GStaticRecMutex;
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struct _GStaticRecMutex
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{
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GStaticMutex mutex;
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unsigned int depth;
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GSystemThread owner;
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};
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#define G_STATIC_REC_MUTEX_INIT { G_STATIC_MUTEX_INIT }
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void g_static_rec_mutex_lock (GStaticRecMutex *mutex);
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gboolean g_static_rec_mutex_trylock (GStaticRecMutex *mutex);
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void g_static_rec_mutex_unlock (GStaticRecMutex *mutex);
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void g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
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guint depth);
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guint g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex);
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typedef struct _GStaticRWLock GStaticRWLock;
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struct _GStaticRWLock
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{
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GStaticMutex mutex;
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GCond *read_cond;
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GCond *write_cond;
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guint read_counter;
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gboolean write;
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guint want_to_write;
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};
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#define G_STATIC_RW_LOCK_INIT { G_STATIC_MUTEX_INIT, NULL, NULL, 0, FALSE, FALSE }
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void g_static_rw_lock_reader_lock (GStaticRWLock* lock);
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gboolean g_static_rw_lock_reader_trylock (GStaticRWLock* lock);
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void g_static_rw_lock_reader_unlock (GStaticRWLock* lock);
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void g_static_rw_lock_writer_lock (GStaticRWLock* lock);
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gboolean g_static_rw_lock_writer_trylock (GStaticRWLock* lock);
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void g_static_rw_lock_writer_unlock (GStaticRWLock* lock);
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void g_static_rw_lock_free (GStaticRWLock* lock);
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/* these are some convenience macros that expand to nothing if GLib
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* was configured with --disable-threads. for using StaticMutexes,
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* you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)
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* if you need to export the mutex. With G_LOCK_EXTERN (name) you can
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* declare such an globally defined lock. name is a unique identifier
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* for the protected varibale or code portion. locking, testing and
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* unlocking of such mutexes can be done with G_LOCK(), G_UNLOCK() and
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* G_TRYLOCK() respectively.
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*/
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extern void glib_dummy_decl (void);
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#define G_LOCK_NAME(name) g__ ## name ## _lock
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#ifdef G_THREADS_ENABLED
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# define G_LOCK_DEFINE_STATIC(name) static G_LOCK_DEFINE (name)
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# define G_LOCK_DEFINE(name) \
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GStaticMutex G_LOCK_NAME (name) = G_STATIC_MUTEX_INIT
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# define G_LOCK_EXTERN(name) extern GStaticMutex G_LOCK_NAME (name)
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# ifdef G_DEBUG_LOCKS
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# define G_LOCK(name) G_STMT_START{ \
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g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): locking: %s ", \
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__FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
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#name); \
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g_static_mutex_lock (&G_LOCK_NAME (name)); \
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}G_STMT_END
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# define G_UNLOCK(name) G_STMT_START{ \
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g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): unlocking: %s ", \
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__FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
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#name); \
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g_static_mutex_unlock (&G_LOCK_NAME (name)); \
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}G_STMT_END
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# define G_TRYLOCK(name) \
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(g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): try locking: %s ", \
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__FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
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#name), g_static_mutex_trylock (&G_LOCK_NAME (name)))
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# else /* !G_DEBUG_LOCKS */
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# define G_LOCK(name) g_static_mutex_lock (&G_LOCK_NAME (name))
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# define G_UNLOCK(name) g_static_mutex_unlock (&G_LOCK_NAME (name))
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# define G_TRYLOCK(name) g_static_mutex_trylock (&G_LOCK_NAME (name))
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# endif /* !G_DEBUG_LOCKS */
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#else /* !G_THREADS_ENABLED */
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# define G_LOCK_DEFINE_STATIC(name) extern void glib_dummy_decl (void)
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# define G_LOCK_DEFINE(name) extern void glib_dummy_decl (void)
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# define G_LOCK_EXTERN(name) extern void glib_dummy_decl (void)
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# define G_LOCK(name)
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# define G_UNLOCK(name)
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# define G_TRYLOCK(name) (TRUE)
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#endif /* !G_THREADS_ENABLED */
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G_END_DECLS
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#endif /* __G_THREAD_H__ */
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