mirror of https://gitee.com/openkylin/glib2.0.git
146 lines
6.5 KiB
C
146 lines
6.5 KiB
C
/* 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.
|
|
*
|
|
* We expect futex to sometimes return EAGAIN due to the race
|
|
* between the caller checking the current value and deciding to
|
|
* do the futex op. To avoid splattering errno on success, we
|
|
* restore the original errno if EAGAIN is seen. See also:
|
|
* https://gitlab.gnome.org/GNOME/glib/-/issues/3034
|
|
*
|
|
* 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 saved_errno = errno; \
|
|
int res = syscall (__NR_futex_time64, uaddr, (gsize) futex_op, __VA_ARGS__); \
|
|
if (res < 0 && errno == ENOSYS) \
|
|
{ \
|
|
errno = saved_errno; \
|
|
res = syscall (__NR_futex, uaddr, (gsize) futex_op, __VA_ARGS__); \
|
|
} \
|
|
if (res < 0 && errno == EAGAIN) \
|
|
{ \
|
|
errno = saved_errno; \
|
|
} \
|
|
} \
|
|
G_STMT_END
|
|
#elif defined(__NR_futex_time64)
|
|
#define g_futex_simple(uaddr, futex_op, ...) \
|
|
G_STMT_START \
|
|
{ \
|
|
int saved_errno = errno; \
|
|
int res = syscall (__NR_futex_time64, uaddr, (gsize) futex_op, __VA_ARGS__); \
|
|
if (res < 0 && errno == EAGAIN) \
|
|
{ \
|
|
errno = saved_errno; \
|
|
} \
|
|
} \
|
|
G_STMT_END
|
|
#elif defined(__NR_futex)
|
|
#define g_futex_simple(uaddr, futex_op, ...) \
|
|
G_STMT_START \
|
|
{ \
|
|
int saved_errno = errno; \
|
|
int res = syscall (__NR_futex, uaddr, (gsize) futex_op, __VA_ARGS__); \
|
|
if (res < 0 && errno == EAGAIN) \
|
|
{ \
|
|
errno = saved_errno; \
|
|
} \
|
|
} \
|
|
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
|
|
|
|
void g_system_thread_wait (GRealThread *thread);
|
|
|
|
GRealThread *g_system_thread_new (GThreadFunc proxy,
|
|
gulong stack_size,
|
|
const char *name,
|
|
GThreadFunc func,
|
|
gpointer data,
|
|
GError **error);
|
|
void g_system_thread_free (GRealThread *thread);
|
|
|
|
G_NORETURN void g_system_thread_exit (void);
|
|
void g_system_thread_set_name (const gchar *name);
|
|
|
|
/* gthread.c */
|
|
GThread *g_thread_new_internal (const gchar *name,
|
|
GThreadFunc proxy,
|
|
GThreadFunc func,
|
|
gpointer data,
|
|
gsize stack_size,
|
|
GError **error);
|
|
|
|
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__ */
|