Fix possible lock-ups when a trigger triggers a trigger.

Hanging was possible on the subsequent try to acquire a mutex.
Now it is correctly implemented and if a trigger is being executed
then no other trigger will be fired, on recursive calls.

diff --git a/ext/mysqlnd/mysqlnd_statistics.h b/ext/mysqlnd/mysqlnd_statistics.h
index b2b5adab963eb02f7a646de740fa575637bf0dba..e9290f363ad8f8b7f8a6b5a27299e81c575c1d66 100644 (file)
--- a/ext/mysqlnd/mysqlnd_statistics.h
+++ b/ext/mysqlnd/mysqlnd_statistics.h
@@ -42,13 +42,20 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
 #define MYSQLND_STATS_UNLOCK(stats)
 #endif
 
-#define MYSQLND_CHECK_AND_CALL_HANDLER(stats, statistic, value) \
+#define MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(stats, statistic, value) \
        { \
+                       MYSQLND_STATS_LOCK(stats); \
+                       (stats)->values[(statistic)] += (value); \
                        if ((stats)->triggers[(statistic)] && (stats)->in_trigger == FALSE) { \
                                (stats)->in_trigger = TRUE; \
+                               MYSQLND_STATS_UNLOCK(stats); \
+                                                                                                                                                                                       \
                                (stats)->triggers[(statistic)]((stats), (statistic), (value) TSRMLS_CC); \
+                                                                                                                                                                                       \
+                               MYSQLND_STATS_LOCK(stats); \
                                (stats)->in_trigger = FALSE; \
                        } \
+                       MYSQLND_STATS_UNLOCK(_p_s); \
        } \
        
 #define MYSQLND_DEC_STATISTIC(enabler, stats, statistic) \
@@ -56,10 +63,7 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
        enum_mysqlnd_collected_stats _s = (statistic);\
        MYSQLND_STATS * _p_s = (MYSQLND_STATS *) (stats); \
        if ((enabler) && _p_s && _s != _p_s->count) { \
-               MYSQLND_STATS_LOCK(_p_s); \
-               MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s, -1); \
-               _p_s->values[_s]--; \
-               MYSQLND_STATS_UNLOCK(_p_s); \
+               MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s, -1); \
        }\
  }
 
@@ -68,10 +72,7 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
        enum_mysqlnd_collected_stats _s = (statistic);\
        MYSQLND_STATS * _p_s = (MYSQLND_STATS *) (stats); \
        if ((enabler) && _p_s && _s != _p_s->count) { \
-               MYSQLND_STATS_LOCK(_p_s); \
-               MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s, 1); \
-               _p_s->values[_s]++; \
-               MYSQLND_STATS_UNLOCK(_p_s); \
+               MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s, 1); \
        }\
  }
 
@@ -81,10 +82,7 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
        MYSQLND_STATS * _p_s = (MYSQLND_STATS *) (stats); \
        if ((enabler) && _p_s && _s != _p_s->count) { \
                uint64_t v = (uint64_t) (value); \
-               MYSQLND_STATS_LOCK(_p_s); \
-               MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s, v); \
-               _p_s->values[_s] += v; \
-               MYSQLND_STATS_UNLOCK(_p_s); \
+               MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s, v); \
        }\
  }
 
@@ -96,16 +94,8 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
                uint64_t v2 = (uint64_t) (value2); \
                enum_mysqlnd_collected_stats _s1 = (statistic1);\
                enum_mysqlnd_collected_stats _s2 = (statistic2);\
-               MYSQLND_STATS_LOCK(_p_s); \
-               if (_s1 != _p_s->count) { \
-                       MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s1, v1); \
-                       _p_s->values[_s1]+= v1; \
-               } \
-               if (_s2 != _p_s->count) { \
-                       MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s2, v2); \
-                       _p_s->values[_s2]+= v2; \
-               } \
-               MYSQLND_STATS_UNLOCK(_p_s); \
+               if (_s1 != _p_s->count) MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s1, v1); \
+               if (_s2 != _p_s->count) MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s2, v2); \
        }\
  }
 
@@ -119,20 +109,9 @@ extern const MYSQLND_STRING mysqlnd_stats_values_names[];
                enum_mysqlnd_collected_stats _s1 = (statistic1);\
                enum_mysqlnd_collected_stats _s2 = (statistic2);\
                enum_mysqlnd_collected_stats _s3 = (statistic3);\
-               MYSQLND_STATS_LOCK(_p_s); \
-               if (_s1 != _p_s->count) { \
-                       MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s1, v1); \
-                       _p_s->values[_s1]+= v1; \
-               } \
-               if (_s2 != _p_s->count) { \
-                       MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s2, v2); \
-                       _p_s->values[_s2]+= v2; \
-               } \
-               if (_s3 != _p_s->count) { \
-                       MYSQLND_CHECK_AND_CALL_HANDLER(_p_s, _s3, v3); \
-                       _p_s->values[_s3]+= v3; \
-               } \
-               MYSQLND_STATS_UNLOCK(_p_s); \
+               if (_s1 != _p_s->count) MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s1, v1); \
+               if (_s2 != _p_s->count) MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s2, v2); \
+               if (_s3 != _p_s->count) MYSQLND_UPDATE_VALUE_AND_CALL_TRIGGER(_p_s, _s3, v3); \
        }\
  }