X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Fhealth-internal.hpp;fp=include%2Flttng%2Fhealth-internal.hpp;h=67bdc6a5eeec383b9ce7706b62c6a61d36769c9e;hp=0000000000000000000000000000000000000000;hb=c9e313bc594f40a86eed237dce222c0fc99c957f;hpb=4878de5c7deb512bbdac4fdfc498907efa06fb7c

diff --git a/include/lttng/health-internal.hpp b/include/lttng/health-internal.hpp
new file mode 100644
index 000000000..67bdc6a5e
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+++ b/include/lttng/health-internal.hpp
@@ -0,0 +1,119 @@
+#ifndef HEALTH_INTERNAL_H
+#define HEALTH_INTERNAL_H
+
+/*
+ * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#include <common/compat/time.hpp>
+#include <pthread.h>
+#include <urcu/tls-compat.h>
+#include <urcu/uatomic.h>
+#include <urcu/list.h>
+#include <lttng/health.h>
+#include <common/macros.hpp>
+
+/*
+ * 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 	(1UL << 0)
+#define HEALTH_CODE_VALUE	(1UL << 1)
+
+#define HEALTH_IS_IN_POLL(x)	((x) & HEALTH_POLL_VALUE)
+
+struct health_app;
+
+enum health_flags {
+	HEALTH_ERROR			 = (1U << 0),
+};
+
+struct health_state {
+	/*
+	 * 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 */
+	int type;			/* Indicates the nature of the thread. */
+	/* Node of the global TLS state list. */
+	struct cds_list_head node;
+};
+
+enum health_cmd {
+	HEALTH_CMD_CHECK		= 0,
+};
+
+struct health_comm_msg {
+	uint32_t cmd;		/* enum health_cmd */
+} LTTNG_PACKED;
+
+struct health_comm_reply {
+	uint64_t ret_code;	/* bitmask of threads in bad health */
+} LTTNG_PACKED;
+
+/* Declare TLS health state. */
+extern DECLARE_URCU_TLS(struct health_state, health_state);
+
+/*
+ * Update current counter by 1 to indicate that the thread entered or left a
+ * blocking state caused by a poll(). If the counter's value is not an even
+ * number (meaning a code execution flow), an LTTNG_ASSERT() is raised.
+ */
+static inline void health_poll_entry(void)
+{
+	/* Code MUST be in code execution state which is an even number. */
+	LTTNG_ASSERT(!(uatomic_read(&URCU_TLS(health_state).current)
+				& HEALTH_POLL_VALUE));
+
+	uatomic_add(&URCU_TLS(health_state).current, HEALTH_POLL_VALUE);
+}
+
+/*
+ * Update current counter by 1 indicating the exit of a poll or blocking call.
+ * If the counter's value is not an odd number (a poll execution), an LTTNG_ASSERT()
+ * is raised.
+ */
+static inline void health_poll_exit(void)
+{
+	/* Code MUST be in poll execution state which is an odd number. */
+	LTTNG_ASSERT(uatomic_read(&URCU_TLS(health_state).current)
+				& HEALTH_POLL_VALUE);
+
+	uatomic_add(&URCU_TLS(health_state).current, HEALTH_POLL_VALUE);
+}
+
+/*
+ * Update current counter by 2 indicates progress in execution of a
+ * thread.
+ */
+static inline void health_code_update(void)
+{
+	uatomic_add(&URCU_TLS(health_state).current, HEALTH_CODE_VALUE);
+}
+
+/*
+ * Set health "error" flag.
+ */
+static inline void health_error(void)
+{
+	uatomic_or(&URCU_TLS(health_state).flags, HEALTH_ERROR);
+}
+
+struct health_app *health_app_create(int nr_types);
+void health_app_destroy(struct health_app *ha);
+int health_check_state(struct health_app *ha, int type);
+void health_register(struct health_app *ha, int type);
+void health_unregister(struct health_app *ha);
+
+#endif /* HEALTH_INTERNAL_H */