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/* GLIB - Library of useful routines for C programming
*
* gthreadprivate.h - GLib internal thread system related declarations.
*
* Copyright (C) 2003 Sebastian Wilhelmi
*
* 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/>.
*/
#ifndef __G_THREADPRIVATE_H__
#define __G_THREADPRIVATE_H__
#include "config.h"
#include "deprecated/gthread.h"
typedef struct _GRealThread GRealThread;
struct _GRealThread
{
GThread thread;
gint ref_count;
gboolean ours;
gchar *name;
gpointer retval;
};
/* system thread implementation (gthread-posix.c, gthread-win32.c) */
#if defined(HAVE_FUTEX) || defined(HAVE_FUTEX_TIME64)
#include <errno.h>
#include <linux/futex.h>
#include <sys/syscall.h>
#include <unistd.h>
#ifndef FUTEX_WAIT_PRIVATE
#define FUTEX_WAIT_PRIVATE FUTEX_WAIT
#define FUTEX_WAKE_PRIVATE FUTEX_WAKE
#endif
/* Wrapper macro to call `futex_time64` and/or `futex` with simple
* parameters and without returning the return value.
*
* If the `futex_time64` syscall does not exist (`ENOSYS`), we retry again
* with the normal `futex` syscall. This can happen if newer kernel headers
* are used than the kernel that is actually running.
*
* This must not be called with a timeout parameter as that differs
* in size between the two syscall variants!
*/
#if defined(__NR_futex) && defined(__NR_futex_time64)
#define g_futex_simple(uaddr, futex_op, ...) \
G_STMT_START \
{ \
int res = syscall (__NR_futex_time64, uaddr, (gsize) futex_op, __VA_ARGS__); \
if (res < 0 && errno == ENOSYS) \
syscall (__NR_futex, uaddr, (gsize) futex_op, __VA_ARGS__); \
} \
G_STMT_END
#elif defined(__NR_futex_time64)
#define g_futex_simple(uaddr, futex_op, ...) \
G_STMT_START \
{ \
syscall (__NR_futex_time64, uaddr, (gsize) futex_op, __VA_ARGS__); \
} \
G_STMT_END
#elif defined(__NR_futex)
#define g_futex_simple(uaddr, futex_op, ...) \
G_STMT_START \
{ \
syscall (__NR_futex, uaddr, (gsize) futex_op, __VA_ARGS__); \
} \
G_STMT_END
#else /* !defined(__NR_futex) && !defined(__NR_futex_time64) */
#error "Neither __NR_futex nor __NR_futex_time64 are defined but were found by meson"
#endif /* defined(__NR_futex) && defined(__NR_futex_time64) */
#endif
/* Platform-specific scheduler settings for a thread */
typedef struct
{
#if defined(HAVE_SYS_SCHED_GETATTR)
/* This is for modern Linux */
struct sched_attr *attr;
#elif defined(G_OS_WIN32)
gint thread_prio;
#else
/* TODO: Add support for macOS and the BSDs */
void *dummy;
#endif
} GThreadSchedulerSettings;
void g_system_thread_wait (GRealThread *thread);
GRealThread *g_system_thread_new (GThreadFunc proxy,
gulong stack_size,
const GThreadSchedulerSettings *scheduler_settings,
const char *name,
GThreadFunc func,
gpointer data,
GError **error);
void g_system_thread_free (GRealThread *thread);
void g_system_thread_exit (void);
void g_system_thread_set_name (const gchar *name);
gboolean g_system_thread_get_scheduler_settings (GThreadSchedulerSettings *scheduler_settings);
/* gthread.c */
GThread *g_thread_new_internal (const gchar *name,
GThreadFunc proxy,
GThreadFunc func,
gpointer data,
gsize stack_size,
const GThreadSchedulerSettings *scheduler_settings,
GError **error);
gboolean g_thread_get_scheduler_settings (GThreadSchedulerSettings *scheduler_settings);
gpointer g_thread_proxy (gpointer thread);
guint g_thread_n_created (void);
gpointer g_private_set_alloc0 (GPrivate *key,
gsize size);
#endif /* __G_THREADPRIVATE_H__ */
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