X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Flttng-sessiond.h;h=ae73507620a8b7ea02c7afdc1d75efa6a30c34bc;hp=79e7fcb4383b1765a870a44c2c6576f5c6c7b92c;hb=971a61c658e35f7e2a71040455a273320b409636;hpb=1af0e2e4d4a770e32f4fc169122b0c338bd799f6 diff --git a/src/bin/lttng-sessiond/lttng-sessiond.h b/src/bin/lttng-sessiond/lttng-sessiond.h index 79e7fcb43..ae7350762 100644 --- a/src/bin/lttng-sessiond/lttng-sessiond.h +++ b/src/bin/lttng-sessiond/lttng-sessiond.h @@ -1,41 +1,83 @@ /* * Copyright (C) 2011 - David Goulet + * Copyright (C) 2013 - Raphaël Beamonte * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; only version 2 - * of the License. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. * * This program 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 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef _LTT_SESSIOND_H #define _LTT_SESSIOND_H -#define _LGPL_SOURCE #include -#include +#include #include +#include #include #include "session.h" #include "ust-app.h" +#include "notification-thread.h" +#include "sessiond-config.h" -const char *module_proc_lttng = "/proc/lttng"; +/* + * Consumer daemon state which is changed when spawning it, killing it or in + * case of a fatal error. + */ +enum consumerd_state { + CONSUMER_STARTED = 1, + CONSUMER_STOPPED = 2, + CONSUMER_ERROR = 3, +}; + +/* + * This consumer daemon state is used to validate if a client command will be + * able to reach the consumer. If not, the client is informed. For instance, + * doing a "lttng start" when the consumer state is set to ERROR will return an + * error to the client. + * + * The following example shows a possible race condition of this scheme: + * + * consumer thread error happens + * client cmd arrives + * client cmd checks state -> still OK + * consumer thread exit, sets error + * client cmd try to talk to consumer + * ... + * + * However, since the consumer is a different daemon, we have no way of making + * sure the command will reach it safely even with this state flag. This is why + * we consider that up to the state validation during command processing, the + * command is safe. After that, we can not guarantee the correctness of the + * client request vis-a-vis the consumer. + */ +extern enum consumerd_state ust_consumerd_state; +extern enum consumerd_state kernel_consumerd_state; extern const char default_home_dir[], default_tracing_group[], default_ust_sock_dir[], default_global_apps_pipe[]; +/* Set in main.c at boot time of the daemon */ +extern int kernel_tracer_fd; +extern struct lttng_kernel_tracer_version kernel_tracer_version; +extern struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; + +/* Notification thread handle. */ +extern struct notification_thread_handle *notification_thread_handle; + /* * This contains extra data needed for processing a command received by the * session daemon from the lttng client. @@ -52,16 +94,86 @@ struct command_ctx { struct ust_command { int sock; struct ust_register_msg reg_msg; - struct cds_wfq_node node; + struct cds_wfcq_node node; }; /* - * Queue used to enqueue UST registration request (ust_commant) and protected + * Queue used to enqueue UST registration request (ust_command) and synchronized * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h */ struct ust_cmd_queue { int32_t futex; - struct cds_wfq_queue queue; + struct cds_wfcq_head head; + struct cds_wfcq_tail tail; +}; + +/* + * This is the wait queue containing wait nodes during the application + * registration process. + */ +struct ust_reg_wait_queue { + unsigned long count; + struct cds_list_head head; +}; + +/* + * Use by the dispatch registration to queue UST command socket to wait for the + * notify socket. + */ +struct ust_reg_wait_node { + struct ust_app *app; + struct cds_list_head head; }; +/* + * Used to notify that a hash table needs to be destroyed by dedicated + * thread. Required by design because we don't want to move destroy + * paths outside of large RCU read-side lock paths, and destroy cannot + * be called by call_rcu thread, because it may hang (waiting for + * call_rcu completion). + */ +extern int ht_cleanup_pipe[2]; + +extern int kernel_poll_pipe[2]; + +/* + * Populated when the daemon starts with the current page size of the system. + * Set in main() with the current page size. + */ +extern long page_size; + +/* Application health monitoring */ +extern struct health_app *health_sessiond; + +extern struct sessiond_config config; + +extern int lttng_sessiond_ready; + +extern int ust_consumerd64_fd, ust_consumerd32_fd; + +/* Parent PID for --sig-parent option */ +extern pid_t ppid; +/* Internal parent PID use with daemonize. */ +extern pid_t child_ppid; + +/* Consumer daemon specific control data. */ +extern struct consumer_data ustconsumer32_data; +extern struct consumer_data ustconsumer64_data; +extern struct consumer_data kconsumer_data; + +int sessiond_init_thread_quit_pipe(void); +int sessiond_check_thread_quit_pipe(int fd, uint32_t events); +int sessiond_wait_for_quit_pipe(unsigned int timeout_us); +int sessiond_notify_quit_pipe(void); +void sessiond_close_quit_pipe(void); + +int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size); +void sessiond_notify_ready(void); +void sessiond_signal_parents(void); + +void sessiond_set_client_thread_state(bool running); +void sessiond_wait_client_thread_stopped(void); + +void *thread_manage_consumer(void *data); + #endif /* _LTT_SESSIOND_H */