src/common/relayd/Makefile
src/common/testpoint/Makefile
src/common/index/Makefile
+ src/common/health/Makefile
src/lib/Makefile
src/lib/lttng-ctl/Makefile
src/lib/lttng-ctl/filter/Makefile
-lttnginclude_HEADERS = lttng/lttng.h lttng/lttng-error.h lttng/snapshot.h
+lttnginclude_HEADERS = \
+ lttng/lttng.h \
+ lttng/lttng-error.h \
+ lttng/snapshot.h
-noinst_HEADERS = lttng/snapshot-internal.h
+noinst_HEADERS = \
+ lttng/snapshot-internal.h \
+ lttng/health-internal.h
--- /dev/null
+#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>
+ *
+ * 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 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., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <assert.h>
+#include <time.h>
+#include <pthread.h>
+#include <urcu/tls-compat.h>
+#include <urcu/uatomic.h>
+#include <urcu/list.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 (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;
+};
+
+/* 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 assert() is raised.
+ */
+static inline void health_poll_entry(void)
+{
+ /* Code MUST be in code execution state which is an even number. */
+ 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 assert()
+ * is raised.
+ */
+static inline void health_poll_exit(void)
+{
+ /* Code MUST be in poll execution state which is an odd number. */
+ 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 */
fd-limit.c fd-limit.h \
kernel-consumer.c kernel-consumer.h \
consumer.h \
- health.c health.h health-sessiond.h \
+ health-sessiond.h \
cmd.c cmd.h \
buffer-registry.c buffer-registry.h \
testpoint.h ht-cleanup.c \
$(top_builddir)/src/common/libcommon.la \
$(top_builddir)/src/common/compat/libcompat.la \
$(top_builddir)/src/common/relayd/librelayd.la \
- $(top_builddir)/src/common/testpoint/libtestpoint.la
+ $(top_builddir)/src/common/testpoint/libtestpoint.la \
+ $(top_builddir)/src/common/health/libhealth.la
if HAVE_LIBLTTNG_UST_CTL
lttng_sessiond_LDADD += -llttng-ust-ctl
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "health.h"
+#include <lttng/health-internal.h>
enum health_type {
HEALTH_TYPE_CMD = 0,
+++ /dev/null
-/*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
- * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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 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., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#include <assert.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-
-#include <common/defaults.h>
-#include <common/error.h>
-#include <common/macros.h>
-#include <common/sessiond-comm/inet.h>
-
-#include "health.h"
-
-/*
- * An application-specific error state for unregistered thread keeps
- * track of thread errors. A thread reporting a health error, normally
- * unregisters and quits. This makes the TLS health state not available
- * to the health_check_state() call so on unregister we update this
- * global error array so we can keep track of which thread was on error
- * if the TLS health state has been removed.
- */
-struct health_app {
- /* List of health state, for each application thread */
- struct cds_list_head list;
- /*
- * This lock ensures that TLS memory used for the node and its
- * container structure don't get reclaimed after the TLS owner
- * thread exits until we have finished using it.
- */
- pthread_mutex_t lock;
- int nr_types;
- struct timespec time_delta;
- /* Health flags containing thread type error state */
- enum health_flags *flags;
-};
-
-/* Define TLS health state. */
-DEFINE_URCU_TLS(struct health_state, health_state);
-
-struct health_app *health_app_create(int nr_types)
-{
- struct health_app *ha;
-
- ha = zmalloc(sizeof(*ha));
- if (!ha) {
- return NULL;
- }
- ha->flags = zmalloc(sizeof(*ha->flags));
- if (!ha->flags) {
- goto error_flags;
- }
- CDS_INIT_LIST_HEAD(&ha->list);
- pthread_mutex_init(&ha->lock, NULL);
- ha->nr_types = nr_types;
- ha->time_delta.tv_sec = DEFAULT_HEALTH_CHECK_DELTA_S;
- ha->time_delta.tv_nsec = DEFAULT_HEALTH_CHECK_DELTA_NS;
- return ha;
-
-error_flags:
- free(ha);
- return NULL;
-}
-
-void health_app_destroy(struct health_app *ha)
-{
- free(ha->flags);
- free(ha);
-}
-
-/*
- * Lock health state global list mutex.
- */
-static void state_lock(struct health_app *ha)
-{
- pthread_mutex_lock(&ha->lock);
-}
-
-/*
- * Unlock health state global list mutex.
- */
-static void state_unlock(struct health_app *ha)
-{
- pthread_mutex_unlock(&ha->lock);
-}
-
-/*
- * Set time difference in res from time_a and time_b.
- */
-static void time_diff(const struct timespec *time_a,
- const struct timespec *time_b, struct timespec *res)
-{
- if (time_a->tv_nsec - time_b->tv_nsec < 0) {
- res->tv_sec = time_a->tv_sec - time_b->tv_sec - 1;
- res->tv_nsec = 1000000000L + time_a->tv_sec - time_b->tv_sec;
- } else {
- res->tv_sec = time_a->tv_sec - time_b->tv_sec;
- res->tv_nsec = time_a->tv_nsec - time_b->tv_nsec;
- }
-}
-
-/*
- * Return true if time_a - time_b > diff, else false.
- */
-static int time_diff_gt(const struct timespec *time_a,
- const struct timespec *time_b, const struct timespec *diff)
-{
- struct timespec res;
-
- time_diff(time_a, time_b, &res);
- time_diff(&res, diff, &res);
-
- if (res.tv_sec > 0) {
- return 1;
- } else if (res.tv_sec == 0 && res.tv_nsec > 0) {
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Validate health state. Checks for the error flag or health conditions.
- *
- * Return 0 if health is bad or else 1.
- */
-static int validate_state(struct health_app *ha, struct health_state *state)
-{
- int retval = 1, ret;
- unsigned long current, last;
- struct timespec current_time;
-
- assert(state);
-
- last = state->last;
- current = uatomic_read(&state->current);
-
- ret = clock_gettime(CLOCK_MONOTONIC, ¤t_time);
- if (ret < 0) {
- PERROR("Error reading time\n");
- /* error */
- retval = 0;
- goto end;
- }
-
- /*
- * Thread is in bad health if flag HEALTH_ERROR is set. It is also in bad
- * health if, after the delta delay has passed, its the progress counter
- * has not moved and it has NOT been waiting for a poll() call.
- */
- if (uatomic_read(&state->flags) & HEALTH_ERROR) {
- retval = 0;
- goto end;
- }
-
- /*
- * Initial condition need to update the last counter and sample time, but
- * should not check health in this initial case, because we don't know how
- * much time has passed.
- */
- if (state->last_time.tv_sec == 0 && state->last_time.tv_nsec == 0) {
- /* update last counter and last sample time */
- state->last = current;
- memcpy(&state->last_time, ¤t_time, sizeof(current_time));
- } else {
- if (time_diff_gt(¤t_time, &state->last_time,
- &ha->time_delta)) {
- if (current == last && !HEALTH_IS_IN_POLL(current)) {
- /* error */
- retval = 0;
- }
- /* update last counter and last sample time */
- state->last = current;
- memcpy(&state->last_time, ¤t_time, sizeof(current_time));
-
- /* On error, stop right now and notify caller. */
- if (retval == 0) {
- goto end;
- }
- }
- }
-
-end:
- DBG("Health state current %lu, last %lu, ret %d",
- current, last, ret);
- return retval;
-}
-
-/*
- * Check health of a specific health type. Note that if a thread has not yet
- * initialize its health subsystem or has quit, it's considered in a good
- * state.
- *
- * Return 0 if health is bad or else 1.
- */
-int health_check_state(struct health_app *ha, int type)
-{
- int retval = 1;
- struct health_state *state;
-
- assert(type < ha->nr_types);
-
- state_lock(ha);
-
- cds_list_for_each_entry(state, &ha->list, node) {
- int ret;
-
- if (state->type != type) {
- continue;
- }
-
- ret = validate_state(ha, state);
- if (!ret) {
- retval = 0;
- goto end;
- }
- }
-
- /* Check the global state since some state might not be visible anymore. */
- if (ha->flags[type] & HEALTH_ERROR) {
- retval = 0;
- }
-
-end:
- state_unlock(ha);
-
- DBG("Health check for type %d is %s", (int) type,
- (retval == 0) ? "BAD" : "GOOD");
- return retval;
-}
-
-/*
- * Init health state.
- */
-void health_register(struct health_app *ha, int type)
-{
- assert(type < ha->nr_types);
-
- /* Init TLS state. */
- uatomic_set(&URCU_TLS(health_state).last, 0);
- uatomic_set(&URCU_TLS(health_state).last_time.tv_sec, 0);
- uatomic_set(&URCU_TLS(health_state).last_time.tv_nsec, 0);
- uatomic_set(&URCU_TLS(health_state).current, 0);
- uatomic_set(&URCU_TLS(health_state).flags, 0);
- uatomic_set(&URCU_TLS(health_state).type, type);
-
- /* Add it to the global TLS state list. */
- state_lock(ha);
- cds_list_add(&URCU_TLS(health_state).node, &ha->list);
- state_unlock(ha);
-}
-
-/*
- * Remove node from global list.
- */
-void health_unregister(struct health_app *ha)
-{
- state_lock(ha);
- /*
- * On error, set the global_error_state since we are about to remove
- * the node from the global list.
- */
- if (uatomic_read(&URCU_TLS(health_state).flags) & HEALTH_ERROR) {
- uatomic_set(&ha->flags[URCU_TLS(health_state).type],
- HEALTH_ERROR);
- }
- cds_list_del(&URCU_TLS(health_state).node);
- state_unlock(ha);
-}
-
-/*
- * Initiliazie health check subsytem. This should be called before any health
- * register occurs.
- */
-void health_init(struct health_app *ha)
-{
- /*
- * Get the maximum value between the default delta value and the TCP
- * timeout with a safety net of the default health check delta.
- */
- ha->time_delta.tv_sec = max_t(unsigned long,
- lttcomm_inet_tcp_timeout + DEFAULT_HEALTH_CHECK_DELTA_S,
- ha->time_delta.tv_sec);
- DBG("Health check time delta in seconds set to %lu",
- ha->time_delta.tv_sec);
-}
+++ /dev/null
-/*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
- *
- * 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 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., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef _HEALTH_H
-#define _HEALTH_H
-
-#include <assert.h>
-#include <time.h>
-#include <pthread.h>
-#include <urcu/tls-compat.h>
-#include <urcu/uatomic.h>
-#include <urcu/list.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 (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;
-};
-
-/* 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 assert() is raised.
- */
-static inline void health_poll_entry(void)
-{
- /* Code MUST be in code execution state which is an even number. */
- 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 assert()
- * is raised.
- */
-static inline void health_poll_exit(void)
-{
- /* Code MUST be in poll execution state which is an odd number. */
- 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);
-void health_init(struct health_app *ha);
-
-#endif /* _HEALTH_H */
PERROR("health_app_create error");
goto exit_health_sessiond_cleanup;
}
- health_init(health_sessiond);
/* Create thread to manage the client socket */
ret = pthread_create(&ht_cleanup_thread, NULL,
AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src
-SUBDIRS = compat hashtable kernel-ctl sessiond-comm relayd \
+SUBDIRS = compat health hashtable kernel-ctl sessiond-comm relayd \
kernel-consumer ust-consumer testpoint index
AM_CFLAGS = -fno-strict-aliasing
--- /dev/null
+AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src
+
+noinst_LTLIBRARIES = libhealth.la
+
+libhealth_la_SOURCES = health.c
--- /dev/null
+/*
+ * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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 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., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <common/defaults.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <common/sessiond-comm/inet.h>
+
+#include <lttng/health-internal.h>
+
+/*
+ * An application-specific error state for unregistered thread keeps
+ * track of thread errors. A thread reporting a health error, normally
+ * unregisters and quits. This makes the TLS health state not available
+ * to the health_check_state() call so on unregister we update this
+ * global error array so we can keep track of which thread was on error
+ * if the TLS health state has been removed.
+ */
+struct health_app {
+ /* List of health state, for each application thread */
+ struct cds_list_head list;
+ /*
+ * This lock ensures that TLS memory used for the node and its
+ * container structure don't get reclaimed after the TLS owner
+ * thread exits until we have finished using it.
+ */
+ pthread_mutex_t lock;
+ int nr_types;
+ struct timespec time_delta;
+ /* Health flags containing thread type error state */
+ enum health_flags *flags;
+};
+
+/* Define TLS health state. */
+DEFINE_URCU_TLS(struct health_state, health_state);
+
+/*
+ * Initialize health check subsytem.
+ */
+static
+void health_init(struct health_app *ha)
+{
+ /*
+ * Get the maximum value between the default delta value and the TCP
+ * timeout with a safety net of the default health check delta.
+ */
+ ha->time_delta.tv_sec = max_t(unsigned long,
+ lttcomm_inet_tcp_timeout + DEFAULT_HEALTH_CHECK_DELTA_S,
+ ha->time_delta.tv_sec);
+ DBG("Health check time delta in seconds set to %lu",
+ ha->time_delta.tv_sec);
+}
+
+struct health_app *health_app_create(int nr_types)
+{
+ struct health_app *ha;
+
+ ha = zmalloc(sizeof(*ha));
+ if (!ha) {
+ return NULL;
+ }
+ ha->flags = zmalloc(sizeof(*ha->flags));
+ if (!ha->flags) {
+ goto error_flags;
+ }
+ CDS_INIT_LIST_HEAD(&ha->list);
+ pthread_mutex_init(&ha->lock, NULL);
+ ha->nr_types = nr_types;
+ ha->time_delta.tv_sec = DEFAULT_HEALTH_CHECK_DELTA_S;
+ ha->time_delta.tv_nsec = DEFAULT_HEALTH_CHECK_DELTA_NS;
+ health_init(ha);
+ return ha;
+
+error_flags:
+ free(ha);
+ return NULL;
+}
+
+void health_app_destroy(struct health_app *ha)
+{
+ free(ha->flags);
+ free(ha);
+}
+
+/*
+ * Lock health state global list mutex.
+ */
+static void state_lock(struct health_app *ha)
+{
+ pthread_mutex_lock(&ha->lock);
+}
+
+/*
+ * Unlock health state global list mutex.
+ */
+static void state_unlock(struct health_app *ha)
+{
+ pthread_mutex_unlock(&ha->lock);
+}
+
+/*
+ * Set time difference in res from time_a and time_b.
+ */
+static void time_diff(const struct timespec *time_a,
+ const struct timespec *time_b, struct timespec *res)
+{
+ if (time_a->tv_nsec - time_b->tv_nsec < 0) {
+ res->tv_sec = time_a->tv_sec - time_b->tv_sec - 1;
+ res->tv_nsec = 1000000000L + time_a->tv_sec - time_b->tv_sec;
+ } else {
+ res->tv_sec = time_a->tv_sec - time_b->tv_sec;
+ res->tv_nsec = time_a->tv_nsec - time_b->tv_nsec;
+ }
+}
+
+/*
+ * Return true if time_a - time_b > diff, else false.
+ */
+static int time_diff_gt(const struct timespec *time_a,
+ const struct timespec *time_b, const struct timespec *diff)
+{
+ struct timespec res;
+
+ time_diff(time_a, time_b, &res);
+ time_diff(&res, diff, &res);
+
+ if (res.tv_sec > 0) {
+ return 1;
+ } else if (res.tv_sec == 0 && res.tv_nsec > 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+ * Validate health state. Checks for the error flag or health conditions.
+ *
+ * Return 0 if health is bad or else 1.
+ */
+static int validate_state(struct health_app *ha, struct health_state *state)
+{
+ int retval = 1, ret;
+ unsigned long current, last;
+ struct timespec current_time;
+
+ assert(state);
+
+ last = state->last;
+ current = uatomic_read(&state->current);
+
+ ret = clock_gettime(CLOCK_MONOTONIC, ¤t_time);
+ if (ret < 0) {
+ PERROR("Error reading time\n");
+ /* error */
+ retval = 0;
+ goto end;
+ }
+
+ /*
+ * Thread is in bad health if flag HEALTH_ERROR is set. It is also in bad
+ * health if, after the delta delay has passed, its the progress counter
+ * has not moved and it has NOT been waiting for a poll() call.
+ */
+ if (uatomic_read(&state->flags) & HEALTH_ERROR) {
+ retval = 0;
+ goto end;
+ }
+
+ /*
+ * Initial condition need to update the last counter and sample time, but
+ * should not check health in this initial case, because we don't know how
+ * much time has passed.
+ */
+ if (state->last_time.tv_sec == 0 && state->last_time.tv_nsec == 0) {
+ /* update last counter and last sample time */
+ state->last = current;
+ memcpy(&state->last_time, ¤t_time, sizeof(current_time));
+ } else {
+ if (time_diff_gt(¤t_time, &state->last_time,
+ &ha->time_delta)) {
+ if (current == last && !HEALTH_IS_IN_POLL(current)) {
+ /* error */
+ retval = 0;
+ }
+ /* update last counter and last sample time */
+ state->last = current;
+ memcpy(&state->last_time, ¤t_time, sizeof(current_time));
+
+ /* On error, stop right now and notify caller. */
+ if (retval == 0) {
+ goto end;
+ }
+ }
+ }
+
+end:
+ DBG("Health state current %lu, last %lu, ret %d",
+ current, last, ret);
+ return retval;
+}
+
+/*
+ * Check health of a specific health type. Note that if a thread has not yet
+ * initialize its health subsystem or has quit, it's considered in a good
+ * state.
+ *
+ * Return 0 if health is bad or else 1.
+ */
+int health_check_state(struct health_app *ha, int type)
+{
+ int retval = 1;
+ struct health_state *state;
+
+ assert(type < ha->nr_types);
+
+ state_lock(ha);
+
+ cds_list_for_each_entry(state, &ha->list, node) {
+ int ret;
+
+ if (state->type != type) {
+ continue;
+ }
+
+ ret = validate_state(ha, state);
+ if (!ret) {
+ retval = 0;
+ goto end;
+ }
+ }
+
+ /* Check the global state since some state might not be visible anymore. */
+ if (ha->flags[type] & HEALTH_ERROR) {
+ retval = 0;
+ }
+
+end:
+ state_unlock(ha);
+
+ DBG("Health check for type %d is %s", (int) type,
+ (retval == 0) ? "BAD" : "GOOD");
+ return retval;
+}
+
+/*
+ * Init health state.
+ */
+void health_register(struct health_app *ha, int type)
+{
+ assert(type < ha->nr_types);
+
+ /* Init TLS state. */
+ uatomic_set(&URCU_TLS(health_state).last, 0);
+ uatomic_set(&URCU_TLS(health_state).last_time.tv_sec, 0);
+ uatomic_set(&URCU_TLS(health_state).last_time.tv_nsec, 0);
+ uatomic_set(&URCU_TLS(health_state).current, 0);
+ uatomic_set(&URCU_TLS(health_state).flags, 0);
+ uatomic_set(&URCU_TLS(health_state).type, type);
+
+ /* Add it to the global TLS state list. */
+ state_lock(ha);
+ cds_list_add(&URCU_TLS(health_state).node, &ha->list);
+ state_unlock(ha);
+}
+
+/*
+ * Remove node from global list.
+ */
+void health_unregister(struct health_app *ha)
+{
+ state_lock(ha);
+ /*
+ * On error, set the global_error_state since we are about to remove
+ * the node from the global list.
+ */
+ if (uatomic_read(&URCU_TLS(health_state).flags) & HEALTH_ERROR) {
+ uatomic_set(&ha->flags[URCU_TLS(health_state).type],
+ HEALTH_ERROR);
+ }
+ cds_list_del(&URCU_TLS(health_state).node);
+ state_unlock(ha);
+}
projects / lttng-tools.git / commitdiff
