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https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
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fcfd4f4ff2
NetworkManager is single-threaded and uses a mainloop. However, sometimes we may need multiple threads. For example, we will need to write sysctl values asynchronously, using the glib thread-pool. For that to work, we also need to switch the network-namespace of the thread-pool thread. We want to use NMPNetns for that. Hence it's better to have NMPNetns thread-safe, instead of coming up with a duplicate implementation. But NMPNetns may want to log, so we also need nm-logging thread-safe. In general, code under "shared/nm-utils" and nm-logging should be usable from multiple threads. It's simpler to make this code thread-safe than re-implementing it. Also, it's a bad limitation to be unable to log from other threads. If there is an error, the best we can often do is to log about it. Make nm-logging thread-safe. Actually, we only need to be able to log from multiple threads. We don't need to setup or configure logging from multiple threads. This restriction allows us to access logging from the main-thread without any thread-synchronization (because all changes in the logging setup are also done from the main-thread). So, while logging from other threads requires a mutex, logging from the main-thread is lock-free.
133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright (C) 2014 - 2018 Red Hat, Inc.
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*/
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#ifndef __NM_SD_ADAPT_BASIC_H__
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#define __NM_SD_ADAPT_BASIC_H__
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#include "nm-default.h"
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#include <syslog.h>
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#include "nm-utils/nm-logging-fwd.h"
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/*****************************************************************************/
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static inline NMLogLevel
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_slog_level_to_nm (int slevel)
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{
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switch (LOG_PRI (slevel)) {
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case LOG_DEBUG: return LOGL_DEBUG;
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case LOG_WARNING: return LOGL_WARN;
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case LOG_CRIT:
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case LOG_ERR: return LOGL_ERR;
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case LOG_INFO:
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case LOG_NOTICE:
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default: return LOGL_INFO;
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}
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}
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static inline int
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_nm_log_get_max_level_realm (void)
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{
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/* inline function, to avoid coverity warning about constant expression. */
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return LOG_DEBUG;
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}
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#define log_get_max_level_realm(realm) _nm_log_get_max_level_realm ()
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#define log_internal_realm(level, error, file, line, func, format, ...) \
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({ \
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const int _nm_e = (error); \
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const NMLogLevel _nm_l = _slog_level_to_nm ((level)); \
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\
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if (_nm_log_enabled_impl (!(NM_THREAD_SAFE_ON_MAIN_THREAD), _nm_l, LOGD_SYSTEMD)) { \
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const char *_nm_location = strrchr ((""file), '/'); \
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\
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_nm_log_impl (_nm_location ? _nm_location + 1 : (""file), (line), (func), !(NM_THREAD_SAFE_ON_MAIN_THREAD), _nm_l, LOGD_SYSTEMD, _nm_e, NULL, NULL, ("%s"format), "libsystemd: ", ## __VA_ARGS__); \
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} \
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(_nm_e > 0 ? -_nm_e : _nm_e); \
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})
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#define log_assert_failed(text, file, line, func) \
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G_STMT_START { \
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log_internal (LOG_CRIT, 0, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting.", text, file, line, func); \
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g_assert_not_reached (); \
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} G_STMT_END
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#define log_assert_failed_unreachable(text, file, line, func) \
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G_STMT_START { \
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log_internal (LOG_CRIT, 0, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting.", text, file, line, func); \
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g_assert_not_reached (); \
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} G_STMT_END
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#define log_assert_failed_return(text, file, line, func) \
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({ \
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log_internal (LOG_DEBUG, 0, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Ignoring.", text, file, line, func); \
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g_return_if_fail_warning (G_LOG_DOMAIN, G_STRFUNC, text); \
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(void) 0; \
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})
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/*****************************************************************************/
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#define VALGRIND 0
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#define ENABLE_DEBUG_HASHMAP 0
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/*****************************************************************************
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* The remainder of the header is only enabled when building the systemd code
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* itself.
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*****************************************************************************/
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#if (NETWORKMANAGER_COMPILATION) & NM_NETWORKMANAGER_COMPILATION_WITH_SYSTEMD
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#include <sys/syscall.h>
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#include <sys/ioctl.h>
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static inline pid_t
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raw_getpid (void) {
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#if defined(__alpha__)
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return (pid_t) syscall (__NR_getxpid);
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#else
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return (pid_t) syscall (__NR_getpid);
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#endif
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}
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static inline pid_t gettid(void) {
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return (pid_t) syscall(SYS_gettid);
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}
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/* we build with C11 and thus <uchar.h> provides char32_t,char16_t. */
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#define HAVE_CHAR32_T 1
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#define HAVE_CHAR16_T 1
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#if defined(HAVE_DECL_REALLOCARRAY) && HAVE_DECL_REALLOCARRAY == 1
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#define HAVE_REALLOCARRAY 1
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#else
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#define HAVE_REALLOCARRAY 0
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#endif
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#if defined(HAVE_DECL_EXPLICIT_BZERO) && HAVE_DECL_EXPLICIT_BZERO == 1
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#define HAVE_EXPLICIT_BZERO 1
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#else
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#define HAVE_EXPLICIT_BZERO 0
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#endif
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#endif /* (NETWORKMANAGER_COMPILATION) & NM_NETWORKMANAGER_COMPILATION_WITH_SYSTEMD */
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/*****************************************************************************/
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#endif /* __NM_SD_ADAPT_BASIC_H__ */
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