X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fmain.c;h=85a20d795cb253123c0b2753a02a8fcad98e8436;hp=730ac656ba199153fd663d825ea4058803b396ea;hb=a23ec3a78becfaeca0041c4a6747d30b3ac44bfd;hpb=7f51dcba1efdc03c85412a75ab71894a1b5af798 diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c index 730ac656b..85a20d795 100644 --- a/src/bin/lttng-sessiond/main.c +++ b/src/bin/lttng-sessiond/main.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include #include @@ -81,7 +80,10 @@ static int is_root; /* Set to 1 if the daemon is running as root */ static pid_t ppid; /* Parent PID for --sig-parent option */ static char *rundir; -/* Consumer daemon specific control data */ +/* + * Consumer daemon specific control data. Every value not initialized here is + * set to 0 by the static definition. + */ static struct consumer_data kconsumer_data = { .type = LTTNG_CONSUMER_KERNEL, .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, @@ -90,6 +92,8 @@ static struct consumer_data kconsumer_data = { .cmd_sock = -1, .pid_mutex = PTHREAD_MUTEX_INITIALIZER, .lock = PTHREAD_MUTEX_INITIALIZER, + .cond = PTHREAD_COND_INITIALIZER, + .cond_mutex = PTHREAD_MUTEX_INITIALIZER, }; static struct consumer_data ustconsumer64_data = { .type = LTTNG_CONSUMER64_UST, @@ -99,6 +103,8 @@ static struct consumer_data ustconsumer64_data = { .cmd_sock = -1, .pid_mutex = PTHREAD_MUTEX_INITIALIZER, .lock = PTHREAD_MUTEX_INITIALIZER, + .cond = PTHREAD_COND_INITIALIZER, + .cond_mutex = PTHREAD_MUTEX_INITIALIZER, }; static struct consumer_data ustconsumer32_data = { .type = LTTNG_CONSUMER32_UST, @@ -108,6 +114,8 @@ static struct consumer_data ustconsumer32_data = { .cmd_sock = -1, .pid_mutex = PTHREAD_MUTEX_INITIALIZER, .lock = PTHREAD_MUTEX_INITIALIZER, + .cond = PTHREAD_COND_INITIALIZER, + .cond_mutex = PTHREAD_MUTEX_INITIALIZER, }; /* Shared between threads */ @@ -788,6 +796,29 @@ error_poll_create: return NULL; } +/* + * Signal pthread condition of the consumer data that the thread. + */ +static void signal_consumer_condition(struct consumer_data *data, int state) +{ + pthread_mutex_lock(&data->cond_mutex); + + /* + * The state is set before signaling. It can be any value, it's the waiter + * job to correctly interpret this condition variable associated to the + * consumer pthread_cond. + * + * A value of 0 means that the corresponding thread of the consumer data + * was not started. 1 indicates that the thread has started and is ready + * for action. A negative value means that there was an error during the + * thread bootstrap. + */ + data->consumer_thread_is_ready = state; + (void) pthread_cond_signal(&data->cond); + + pthread_mutex_unlock(&data->cond_mutex); +} + /* * This thread manage the consumer error sent back to the session daemon. */ @@ -886,13 +917,13 @@ restart: consumer_data->cmd_sock = lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); if (consumer_data->cmd_sock < 0) { - sem_post(&consumer_data->sem); + /* On error, signal condition and quit. */ + signal_consumer_condition(consumer_data, -1); PERROR("consumer connect"); goto error; } - /* Signal condition to tell that the kconsumerd is ready */ - sem_post(&consumer_data->sem); - DBG("consumer command socket ready"); + signal_consumer_condition(consumer_data, 1); + DBG("Consumer command socket ready"); } else { ERR("consumer error when waiting for SOCK_READY : %s", lttcomm_get_readable_code(-code)); @@ -1446,59 +1477,110 @@ error_create_poll: */ static int spawn_consumer_thread(struct consumer_data *consumer_data) { - int ret; + int ret, clock_ret; struct timespec timeout; - timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; - timeout.tv_nsec = 0; + /* Make sure we set the readiness flag to 0 because we are NOT ready */ + consumer_data->consumer_thread_is_ready = 0; - /* Setup semaphore */ - ret = sem_init(&consumer_data->sem, 0, 0); - if (ret < 0) { - PERROR("sem_init consumer semaphore"); + /* Setup pthread condition */ + ret = pthread_condattr_init(&consumer_data->condattr); + if (ret != 0) { + errno = ret; + PERROR("pthread_condattr_init consumer data"); + goto error; + } + + /* + * Set the monotonic clock in order to make sure we DO NOT jump in time + * between the clock_gettime() call and the timedwait call. See bug #324 + * for a more details and how we noticed it. + */ + ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); + if (ret != 0) { + errno = ret; + PERROR("pthread_condattr_setclock consumer data"); goto error; } - ret = pthread_create(&consumer_data->thread, NULL, - thread_manage_consumer, consumer_data); + ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); + if (ret != 0) { + errno = ret; + PERROR("pthread_cond_init consumer data"); + goto error; + } + + ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, + consumer_data); if (ret != 0) { PERROR("pthread_create consumer"); ret = -1; goto error; } + /* We are about to wait on a pthread condition */ + pthread_mutex_lock(&consumer_data->cond_mutex); + /* Get time for sem_timedwait absolute timeout */ - ret = clock_gettime(CLOCK_REALTIME, &timeout); - if (ret < 0) { - PERROR("clock_gettime spawn consumer"); - /* Infinite wait for the kconsumerd thread to be ready */ - ret = sem_wait(&consumer_data->sem); - } else { - /* Normal timeout if the gettime was successful */ - timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; - ret = sem_timedwait(&consumer_data->sem, &timeout); + clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); + /* + * Set the timeout for the condition timed wait even if the clock gettime + * call fails since we might loop on that call and we want to avoid to + * increment the timeout too many times. + */ + timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; + + /* + * The following loop COULD be skipped in some conditions so this is why we + * set ret to 0 in order to make sure at least one round of the loop is + * done. + */ + ret = 0; + + /* + * Loop until the condition is reached or when a timeout is reached. Note + * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT + * be returned but the pthread_cond(3), from the glibc-doc, says that it is + * possible. This loop does not take any chances and works with both of + * them. + */ + while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { + if (clock_ret < 0) { + PERROR("clock_gettime spawn consumer"); + /* Infinite wait for the consumerd thread to be ready */ + ret = pthread_cond_wait(&consumer_data->cond, + &consumer_data->cond_mutex); + } else { + ret = pthread_cond_timedwait(&consumer_data->cond, + &consumer_data->cond_mutex, &timeout); + } } - if (ret < 0) { - if (errno == ETIMEDOUT) { + /* Release the pthread condition */ + pthread_mutex_unlock(&consumer_data->cond_mutex); + + if (ret != 0) { + errno = ret; + if (ret == ETIMEDOUT) { /* * Call has timed out so we kill the kconsumerd_thread and return * an error. */ - ERR("The consumer thread was never ready. Killing it"); + ERR("Condition timed out. The consumer thread was never ready." + " Killing it"); ret = pthread_cancel(consumer_data->thread); if (ret < 0) { PERROR("pthread_cancel consumer thread"); } } else { - PERROR("semaphore wait failed consumer thread"); + PERROR("pthread_cond_wait failed consumer thread"); } goto error; } pthread_mutex_lock(&consumer_data->pid_mutex); if (consumer_data->pid == 0) { - ERR("Kconsumerd did not start"); + ERR("Consumerd did not start"); pthread_mutex_unlock(&consumer_data->pid_mutex); goto error; }