mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-11-10 03:16:17 +01:00
179 lines
8.8 KiB
C
179 lines
8.8 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.
|
||
*
|
||
* The `futex_time64` syscall is also skipped in favour of `futex` if the
|
||
* Android runtime’s API level is lower than 30, as it’s blocked by seccomp
|
||
* there and using it will cause the app to be terminated:
|
||
* https://android-review.googlesource.com/c/platform/bionic/+/1094758
|
||
* https://github.com/aosp-mirror/platform_bionic/commit/ee7bc3002dc3127faac110167d28912eb0e86a20
|
||
*
|
||
* This must not be called with a timeout parameter as that differs
|
||
* in size between the two syscall variants!
|
||
*/
|
||
#if defined(HAVE_FUTEX) && defined(HAVE_FUTEX_TIME64)
|
||
#if defined(__ANDROID__)
|
||
#define g_futex_simple(uaddr, futex_op, ...) \
|
||
G_STMT_START \
|
||
{ \
|
||
int saved_errno = errno; \
|
||
int res = 0; \
|
||
if (__builtin_available (android 30, *)) \
|
||
{ \
|
||
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__); \
|
||
} \
|
||
} \
|
||
else \
|
||
{ \
|
||
res = syscall (__NR_futex, uaddr, (gsize) futex_op, __VA_ARGS__); \
|
||
} \
|
||
if (res < 0 && errno == EAGAIN) \
|
||
{ \
|
||
errno = saved_errno; \
|
||
} \
|
||
} \
|
||
G_STMT_END
|
||
#else
|
||
#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
|
||
#endif /* defined(__ANDROID__) */
|
||
#elif defined(HAVE_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(HAVE_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(HAVE_FUTEX) && !defined(HAVE_FUTEX_TIME64) */
|
||
#error "Neither __NR_futex nor __NR_futex_time64 are available"
|
||
#endif /* defined(HAVE_FUTEX) && defined(HAVE_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__ */
|