projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 44a5e5eb DG |
1 | /* |
| 2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify it | |
| 5 | * under the terms of the GNU General Public License, version 2 only, as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 11 | * more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public License along with | |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 16 | */ | |
| 17 | ||
| 18 | #ifndef _HEALTH_H | |
| 19 | #define _HEALTH_H | |
| 20 | ||
| 21 | #include <stdint.h> | |
| 22 | #include <urcu/uatomic.h> | |
| 23 | ||
| 24 | /* | |
| 25 | * These are the value added to the current state depending of the position in | |
| 26 | * the thread where is either waiting on a poll() or running in the code. | |
| 27 | */ | |
| 28 | #define HEALTH_POLL_VALUE 1 | |
| 29 | #define HEALTH_CODE_VALUE 2 | |
| 30 | ||
| 31 | #define HEALTH_IS_IN_POLL(x) (x % HEALTH_CODE_VALUE) | |
| 32 | #define HEALTH_IS_IN_CODE(x) (x % HEALTH_POLL_VALUE) | |
| 33 | ||
| 34 | struct health_state { | |
| 35 | uint64_t last; | |
| 36 | uint64_t current; | |
| 37 | }; | |
| 38 | ||
| 39 | /* Health state counters for the client command thread */ | |
| 40 | extern struct health_state health_thread_cmd; | |
| 41 | ||
| 42 | /* Health state counters for the application registration thread */ | |
| 43 | extern struct health_state health_thread_app_reg; | |
| 44 | ||
| 45 | /* Health state counters for the kernel thread */ | |
| 46 | extern struct health_state health_thread_kernel; | |
| 47 | ||
| 48 | /* | |
| 49 | * Update current counter by 1 to indicate that the thread is in a blocking | |
| 50 | * state cause by a poll(). | |
| 51 | */ | |
| 52 | static inline void health_poll_update(struct health_state *state) | |
| 53 | { | |
| 54 | assert(state); | |
| 55 | ||
| 56 | uatomic_add(&state->current, HEALTH_POLL_VALUE); | |
| 57 | } | |
| 58 | ||
| 59 | /* | |
| 60 | * Update current counter by 2 which indicates that we are currently running in | |
| 61 | * a thread and NOT blocked at a poll(). | |
| 62 | */ | |
| 63 | static inline void health_code_update(struct health_state *state) | |
| 64 | { | |
| 65 | assert(state); | |
| 66 | ||
| 67 | uatomic_add(&state->current, HEALTH_CODE_VALUE); | |
| 68 | } | |
| 69 | ||
| 70 | /* | |
| 71 | * Reset health state. A value of zero indicate a bad health state. | |
| 72 | */ | |
| 73 | static inline void health_reset(struct health_state *state) | |
| 74 | { | |
| 75 | assert(state); | |
| 76 | ||
| 77 | uatomic_set(&state->current, 0); | |
| 78 | uatomic_set(&state->last, 0); | |
| 79 | } | |
| 80 | ||
| 81 | /* | |
| 82 | * Init health state. | |
| 83 | */ | |
| 84 | static inline void health_init(struct health_state *state) | |
| 85 | { | |
| 86 | assert(state); | |
| 87 | ||
| 88 | uatomic_set(&state->last, 0); | |
| 89 | uatomic_set(&state->current, HEALTH_CODE_VALUE); | |
| 90 | } | |
| 91 | ||
| 92 | int health_check_state(struct health_state *state); | |
| 93 | ||
| 94 | #endif /* _HEALTH_H */ |