1 #ifndef HEALTH_INTERNAL_H
2 #define HEALTH_INTERNAL_H
5 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
6 * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License, version 2 only, as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc., 51
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <urcu/tls-compat.h>
26 #include <urcu/uatomic.h>
27 #include <urcu/list.h>
28 #include <lttng/health.h>
29 #include <common/macros.h>
32 * These are the value added to the current state depending of the position in
33 * the thread where is either waiting on a poll() or running in the code.
35 #define HEALTH_POLL_VALUE (1UL << 0)
36 #define HEALTH_CODE_VALUE (1UL << 1)
38 #define HEALTH_IS_IN_POLL(x) ((x) & HEALTH_POLL_VALUE)
43 HEALTH_ERROR
= (1U << 0),
48 * last counter and last_time are only read and updated by the health_check
49 * thread (single updater).
52 struct timespec last_time
;
55 * current and flags are updated by multiple threads concurrently.
57 unsigned long current
; /* progress counter, updated atomically */
58 enum health_flags flags
; /* other flags, updated atomically */
59 int type
; /* Indicates the nature of the thread. */
60 /* Node of the global TLS state list. */
61 struct cds_list_head node
;
68 struct health_comm_msg
{
69 uint32_t cmd
; /* enum health_cmd */
72 struct health_comm_reply
{
73 uint64_t ret_code
; /* bitmask of threads in bad health */
76 /* Declare TLS health state. */
77 extern DECLARE_URCU_TLS(struct health_state
, health_state
);
80 * Update current counter by 1 to indicate that the thread entered or left a
81 * blocking state caused by a poll(). If the counter's value is not an even
82 * number (meaning a code execution flow), an assert() is raised.
84 static inline void health_poll_entry(void)
86 /* Code MUST be in code execution state which is an even number. */
87 assert(!(uatomic_read(&URCU_TLS(health_state
).current
)
88 & HEALTH_POLL_VALUE
));
90 uatomic_add(&URCU_TLS(health_state
).current
, HEALTH_POLL_VALUE
);
94 * Update current counter by 1 indicating the exit of a poll or blocking call.
95 * If the counter's value is not an odd number (a poll execution), an assert()
98 static inline void health_poll_exit(void)
100 /* Code MUST be in poll execution state which is an odd number. */
101 assert(uatomic_read(&URCU_TLS(health_state
).current
)
102 & HEALTH_POLL_VALUE
);
104 uatomic_add(&URCU_TLS(health_state
).current
, HEALTH_POLL_VALUE
);
108 * Update current counter by 2 indicates progress in execution of a
111 static inline void health_code_update(void)
113 uatomic_add(&URCU_TLS(health_state
).current
, HEALTH_CODE_VALUE
);
117 * Set health "error" flag.
119 static inline void health_error(void)
121 uatomic_or(&URCU_TLS(health_state
).flags
, HEALTH_ERROR
);
124 struct health_app
*health_app_create(int nr_types
);
125 void health_app_destroy(struct health_app
*ha
);
126 int health_check_state(struct health_app
*ha
, int type
);
127 void health_register(struct health_app
*ha
, int type
);
128 void health_unregister(struct health_app
*ha
);
130 #endif /* HEALTH_INTERNAL_H */
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