#ifndef _HEALTH_H
#define _HEALTH_H
-#include <stdint.h>
+#include <assert.h>
+#include <time.h>
#include <urcu/uatomic.h>
/*
* These are the value added to the current state depending of the position in
* the thread where is either waiting on a poll() or running in the code.
*/
-#define HEALTH_POLL_VALUE 1
-#define HEALTH_CODE_VALUE 2
+#define HEALTH_POLL_VALUE (1UL << 0)
+#define HEALTH_CODE_VALUE (1UL << 1)
-#define HEALTH_IS_IN_POLL(x) (x % HEALTH_CODE_VALUE)
-#define HEALTH_IS_IN_CODE(x) (x % HEALTH_POLL_VALUE)
+#define HEALTH_IS_IN_POLL(x) ((x) & HEALTH_POLL_VALUE)
+
+enum health_flags {
+ HEALTH_EXIT = (1U << 0),
+ HEALTH_ERROR = (1U << 1),
+};
struct health_state {
- uint64_t last;
- uint64_t current;
+ /*
+ * last counter and last_time are only read and updated by the health_check
+ * thread (single updater).
+ */
+ unsigned long last;
+ struct timespec last_time;
+
+ /*
+ * current and flags are updated by multiple threads concurrently.
+ */
+ unsigned long current; /* progress counter, updated atomically */
+ enum health_flags flags; /* other flags, updated atomically */
};
/* Health state counters for the client command thread */
extern struct health_state health_thread_cmd;
+/* Health state counters for the application management thread */
+extern struct health_state health_thread_app_manage;
+
/* Health state counters for the application registration thread */
extern struct health_state health_thread_app_reg;
extern struct health_state health_thread_kernel;
/*
- * Update current counter by 1 to indicate that the thread is in a blocking
- * state cause by a poll().
+ * Update current counter by 1 to indicate that the thread entered or
+ * left a blocking state caused by a poll().
*/
static inline void health_poll_update(struct health_state *state)
{
assert(state);
-
uatomic_add(&state->current, HEALTH_POLL_VALUE);
}
/*
- * Update current counter by 2 which indicates that we are currently running in
- * a thread and NOT blocked at a poll().
+ * Update current counter by 2 indicates progress in execution of a
+ * thread.
*/
static inline void health_code_update(struct health_state *state)
{
assert(state);
-
uatomic_add(&state->current, HEALTH_CODE_VALUE);
}
/*
- * Reset health state. A value of zero indicate a bad health state.
+ * Set health "exit" flag.
*/
-static inline void health_reset(struct health_state *state)
+static inline void health_exit(struct health_state *state)
{
assert(state);
+ uatomic_or(&state->flags, HEALTH_EXIT);
+}
- uatomic_set(&state->current, 0);
- uatomic_set(&state->last, 0);
+/*
+ * Set health "error" flag.
+ */
+static inline void health_error(struct health_state *state)
+{
+ assert(state);
+ uatomic_or(&state->flags, HEALTH_ERROR);
}
/*
static inline void health_init(struct health_state *state)
{
assert(state);
-
- uatomic_set(&state->last, 0);
- uatomic_set(&state->current, HEALTH_CODE_VALUE);
+ state->last = 0;
+ state->last_time.tv_sec = 0;
+ state->last_time.tv_nsec = 0;
+ uatomic_set(&state->current, 0);
+ uatomic_set(&state->flags, 0);
}
int health_check_state(struct health_state *state);