#define n_vlog_modules ARRAY_SIZE(vlog_modules)
#endif
+/* Protects the 'pattern' in all "struct facility"s, so that a race between
+ * changing and reading the pattern does not cause an access to freed
+ * memory. */
+static struct ovs_rwlock pattern_rwlock = OVS_RWLOCK_INITIALIZER;
+
/* Information about each facility. */
struct facility {
const char *name; /* Name. */
- char *pattern; /* Current pattern (see 'pattern_rwlock'). */
+ char *pattern OVS_GUARDED_BY(pattern_rwlock); /* Current pattern. */
bool default_pattern; /* Whether current pattern is the default. */
};
static struct facility facilities[VLF_N_FACILITIES] = {
#undef VLOG_FACILITY
};
-/* Protects the 'pattern' in all "struct facility"s, so that a race between
- * changing and reading the pattern does not cause an access to freed
- * memory. */
-static pthread_rwlock_t pattern_rwlock = PTHREAD_RWLOCK_INITIALIZER;
-
/* Sequence number for the message currently being composed. */
-DEFINE_PER_THREAD_DATA(unsigned int, msg_num, 0);
+DEFINE_STATIC_PER_THREAD_DATA(unsigned int, msg_num, 0);
/* VLF_FILE configuration.
*
* All of the following is protected by 'log_file_mutex', which nests inside
* pattern_rwlock. */
-static pthread_mutex_t log_file_mutex = PTHREAD_ADAPTIVE_MUTEX_INITIALIZER;
-static char *log_file_name;
-static int log_fd = -1;
-static struct async_append *log_writer;
+static struct ovs_mutex log_file_mutex = OVS_ADAPTIVE_MUTEX_INITIALIZER;
+static char *log_file_name OVS_GUARDED_BY(log_file_mutex);
+static int log_fd OVS_GUARDED_BY(log_file_mutex) = -1;
+static struct async_append *log_writer OVS_GUARDED_BY(log_file_mutex);
+static bool log_async OVS_GUARDED_BY(log_file_mutex);
static void format_log_message(const struct vlog_module *, enum vlog_level,
enum vlog_facility,
const char *message, va_list, struct ds *)
- PRINTF_FORMAT(4, 0);
+ PRINTF_FORMAT(4, 0) OVS_REQ_RDLOCK(&pattern_rwlock);
/* Searches the 'n_names' in 'names'. Returns the index of a match for
* 'target', or 'n_names' if no name matches. */
return module->levels[facility];
}
-static void OVS_MUST_HOLD(log_file_mutex)
-update_min_level(struct vlog_module *module)
+static void
+update_min_level(struct vlog_module *module) OVS_REQUIRES(&log_file_mutex)
{
enum vlog_facility facility;
assert(facility >= 0 && facility < VLF_N_FACILITIES);
assert(level < VLL_N_LEVELS);
- xpthread_mutex_lock(&log_file_mutex);
+ ovs_mutex_lock(&log_file_mutex);
if (!module) {
struct vlog_module **mp;
module->levels[facility] = level;
update_min_level(module);
}
- xpthread_mutex_unlock(&log_file_mutex);
+ ovs_mutex_unlock(&log_file_mutex);
}
/* Sets the logging level for the given 'module' and 'facility' to 'level'. A
{
struct facility *f = &facilities[facility];
- xpthread_rwlock_wrlock(&pattern_rwlock);
+ ovs_rwlock_wrlock(&pattern_rwlock);
if (!f->default_pattern) {
free(f->pattern);
} else {
f->default_pattern = false;
}
f->pattern = xstrdup(pattern);
- xpthread_rwlock_unlock(&pattern_rwlock);
+ ovs_rwlock_unlock(&pattern_rwlock);
}
/* Sets the pattern for the given 'facility' to 'pattern'. */
struct stat new_stat;
int new_log_fd;
bool same_file;
+ bool log_close;
/* Open new log file. */
new_log_file_name = (file_name
}
/* If the new log file is the same one we already have open, bail out. */
- xpthread_mutex_lock(&log_file_mutex);
+ ovs_mutex_lock(&log_file_mutex);
same_file = (log_fd >= 0
&& new_log_fd >= 0
&& !fstat(log_fd, &old_stat)
&& !fstat(new_log_fd, &new_stat)
&& old_stat.st_dev == new_stat.st_dev
&& old_stat.st_ino == new_stat.st_ino);
- xpthread_mutex_unlock(&log_file_mutex);
+ ovs_mutex_unlock(&log_file_mutex);
if (same_file) {
close(new_log_fd);
free(new_log_file_name);
}
/* Log closing old log file (we can't log while holding log_file_mutex). */
- if (log_fd >= 0) {
+ ovs_mutex_lock(&log_file_mutex);
+ log_close = log_fd >= 0;
+ ovs_mutex_unlock(&log_file_mutex);
+ if (log_close) {
VLOG_INFO("closing log file");
}
/* Close old log file, if any, and install new one. */
- xpthread_mutex_lock(&log_file_mutex);
+ ovs_mutex_lock(&log_file_mutex);
if (log_fd >= 0) {
free(log_file_name);
close(log_fd);
log_file_name = xstrdup(new_log_file_name);
log_fd = new_log_fd;
- log_writer = async_append_create(new_log_fd);
+ if (log_async) {
+ log_writer = async_append_create(new_log_fd);
+ }
for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
update_min_level(*mp);
}
- xpthread_mutex_unlock(&log_file_mutex);
+ ovs_mutex_unlock(&log_file_mutex);
/* Log opening new log file (we can't log while holding log_file_mutex). */
VLOG_INFO("opened log file %s", new_log_file_name);
{
char *fn;
- xpthread_mutex_lock(&log_file_mutex);
+ ovs_mutex_lock(&log_file_mutex);
fn = log_file_name ? xstrdup(log_file_name) : NULL;
- xpthread_mutex_unlock(&log_file_mutex);
+ ovs_mutex_unlock(&log_file_mutex);
if (fn) {
int error = vlog_set_log_file(fn);
vlog_unixctl_reopen(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
- if (log_file_name) {
+ bool has_log_file;
+
+ ovs_mutex_lock(&log_file_mutex);
+ has_log_file = log_file_name != NULL;
+ ovs_mutex_unlock(&log_file_mutex);
+
+ if (has_log_file) {
int error = vlog_reopen_log_file();
if (error) {
unixctl_command_reply_error(conn, ovs_strerror(errno));
pthread_once(&once, vlog_init__);
}
+/* Enables VLF_FILE log output to be written asynchronously to disk.
+ * Asynchronous file writes avoid blocking the process in the case of a busy
+ * disk, but on the other hand they are less robust: there is a chance that the
+ * write will not make it to the log file if the process crashes soon after the
+ * log call. */
+void
+vlog_enable_async(void)
+{
+ ovs_mutex_lock(&log_file_mutex);
+ log_async = true;
+ if (log_fd >= 0 && !log_writer) {
+ log_writer = async_append_create(log_fd);
+ }
+ ovs_mutex_unlock(&log_file_mutex);
+}
+
/* Print the current logging level for each module. */
char *
vlog_get_levels(void)
{
bool log_to_console = module->levels[VLF_CONSOLE] >= level;
bool log_to_syslog = module->levels[VLF_SYSLOG] >= level;
- bool log_to_file = module->levels[VLF_FILE] >= level && log_fd >= 0;
+ bool log_to_file;
+
+ ovs_mutex_lock(&log_file_mutex);
+ log_to_file = module->levels[VLF_FILE] >= level && log_fd >= 0;
+ ovs_mutex_unlock(&log_file_mutex);
if (log_to_console || log_to_syslog || log_to_file) {
int save_errno = errno;
struct ds s;
ds_reserve(&s, 1024);
++*msg_num_get();
- xpthread_rwlock_rdlock(&pattern_rwlock);
+ ovs_rwlock_rdlock(&pattern_rwlock);
if (log_to_console) {
format_log_message(module, level, VLF_CONSOLE, message, args, &s);
ds_put_char(&s, '\n');
format_log_message(module, level, VLF_FILE, message, args, &s);
ds_put_char(&s, '\n');
- xpthread_mutex_lock(&log_file_mutex);
+ ovs_mutex_lock(&log_file_mutex);
if (log_fd >= 0) {
- async_append_write(log_writer, s.string, s.length);
- if (level == VLL_EMER) {
- async_append_flush(log_writer);
+ if (log_writer) {
+ async_append_write(log_writer, s.string, s.length);
+ if (level == VLL_EMER) {
+ async_append_flush(log_writer);
+ }
+ } else {
+ ignore(write(log_fd, s.string, s.length));
}
}
- xpthread_mutex_unlock(&log_file_mutex);
+ ovs_mutex_unlock(&log_file_mutex);
}
- xpthread_rwlock_unlock(&pattern_rwlock);
+ ovs_rwlock_unlock(&pattern_rwlock);
ds_destroy(&s);
errno = save_errno;
return true;
}
- xpthread_mutex_lock(&rl->mutex);
+ ovs_mutex_lock(&rl->mutex);
if (!token_bucket_withdraw(&rl->token_bucket, VLOG_MSG_TOKENS)) {
time_t now = time_now();
if (!rl->n_dropped) {
}
rl->last_dropped = now;
rl->n_dropped++;
- xpthread_mutex_unlock(&rl->mutex);
+ ovs_mutex_unlock(&rl->mutex);
return true;
}
if (!rl->n_dropped) {
- xpthread_mutex_unlock(&rl->mutex);
+ ovs_mutex_unlock(&rl->mutex);
} else {
time_t now = time_now();
unsigned int n_dropped = rl->n_dropped;
unsigned int first_dropped_elapsed = now - rl->first_dropped;
unsigned int last_dropped_elapsed = now - rl->last_dropped;
rl->n_dropped = 0;
- xpthread_mutex_unlock(&rl->mutex);
+ ovs_mutex_unlock(&rl->mutex);
vlog(module, level,
"Dropped %u log messages in last %u seconds (most recently, "
git://git.onelab.eu / sliver-openvswitch.git / blobdiff