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Add a new inline function to check whether debug logging is on

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We already do this in our log_debug() macro, but there are times
when we'd like to avoid allocating or precomputing something that we
are only going to log if debugging is on.
This commit is contained in:
Nick Mathewson 2019-01-13 15:45:06 -05:00
parent 253fea84cf
commit a62ac17198
1 changed files with 13 additions and 4 deletions
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17
src/lib/log/log.h
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@ -193,6 +193,15 @@ void tor_log_get_logfile_names(struct smartlist_t *out);
extern int log_global_min_severity_;
static inline bool debug_logging_enabled(void);
/**
* Return true iff debug logging is enabled for at least one domain.
*/
static inline bool debug_logging_enabled(void)
{
return PREDICT_UNLIKELY(log_global_min_severity_ == LOG_DEBUG);
}
void log_fn_(int severity, log_domain_mask_t domain,
const char *funcname, const char *format, ...)
CHECK_PRINTF(4,5);
@ -222,8 +231,8 @@ void tor_log_string(int severity, log_domain_mask_t domain,
log_fn_ratelim_(ratelim, severity, domain, __FUNCTION__, args)
#define log_debug(domain, args...) \
STMT_BEGIN \
if (PREDICT_UNLIKELY(log_global_min_severity_ == LOG_DEBUG)) \
log_fn_(LOG_DEBUG, domain, __FUNCTION__, args); \
if (debug_logging_enabled()) \
log_fn_(LOG_DEBUG, domain, __FUNCTION__, args); \
STMT_END
#define log_info(domain, args...) \
log_fn_(LOG_INFO, domain, __FUNCTION__, args)
@ -240,8 +249,8 @@ void tor_log_string(int severity, log_domain_mask_t domain,
#define log_debug(domain, args, ...) \
STMT_BEGIN \
if (PREDICT_UNLIKELY(log_global_min_severity_ == LOG_DEBUG)) \
log_fn_(LOG_DEBUG, domain, __FUNCTION__, args, ##__VA_ARGS__); \
if (debug_logging_enabled()) \
log_fn_(LOG_DEBUG, domain, __FUNCTION__, args, ##__VA_ARGS__); \
STMT_END
#define log_info(domain, args,...) \
log_fn_(LOG_INFO, domain, __FUNCTION__, args, ##__VA_ARGS__)