channel.c: Make CHECK_BLOCKING() save thread LWP id for messages.

* Removed an unnecessary call to ast_channel_blocker_set() in
__ast_read().

ASTERISK-27625

Change-Id: I342168b999984666fb869cd519fe779583a73834

include/asterisk/channel.h

@@ -2725,11 +2725,12 @@ static inline enum ast_t38_state ast_channel_get_t38_state(struct ast_channel *c
 	do { \
 		if (ast_test_flag(ast_channel_flags(c), AST_FLAG_BLOCKING)) { \
 			/* This should not happen as there should only be one thread handling a channel's media at a time. */ \
-			ast_log(LOG_DEBUG, "Thread %p is blocking '%s', already blocked by thread %p in procedure %s\n", \
-				(void *) pthread_self(), ast_channel_name(c), \
-				(void *) ast_channel_blocker(c), ast_channel_blockproc(c)); \
+			ast_log(LOG_DEBUG, "Thread LWP %d is blocking '%s', already blocked by thread LWP %d in procedure %s\n", \
+				ast_get_tid(), ast_channel_name(c), \
+				ast_channel_blocker_tid(c), ast_channel_blockproc(c)); \
 			ast_assert(0); \
 		} \
+		ast_channel_blocker_tid_set((c), ast_get_tid()); \
 		ast_channel_blocker_set((c), pthread_self()); \
 		ast_channel_blockproc_set((c), __PRETTY_FUNCTION__); \
 		ast_set_flag(ast_channel_flags(c), AST_FLAG_BLOCKING); \
@@ -4369,6 +4370,9 @@ int ast_channel_fd_add(struct ast_channel *chan, int value);
 pthread_t ast_channel_blocker(const struct ast_channel *chan);
 void ast_channel_blocker_set(struct ast_channel *chan, pthread_t value);
 
+int ast_channel_blocker_tid(const struct ast_channel *chan);
+void ast_channel_blocker_tid_set(struct ast_channel *chan, int tid);
+
 ast_timing_func_t ast_channel_timingfunc(const struct ast_channel *chan);
 void ast_channel_timingfunc_set(struct ast_channel *chan, ast_timing_func_t value);
 

main/channel.c

@@ -2618,10 +2618,10 @@ void ast_hangup(struct ast_channel *chan)
 	ast_channel_generator_set(chan, NULL);
 
 	if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_BLOCKING)) {
-		ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
-			"is blocked by thread %ld in procedure %s!  Expect a failure\n",
-			(long) pthread_self(), ast_channel_name(chan), (long)ast_channel_blocker(chan), ast_channel_blockproc(chan));
-		ast_assert(ast_test_flag(ast_channel_flags(chan), AST_FLAG_BLOCKING) == 0);
+		ast_log(LOG_WARNING, "Hard hangup called by thread LWP %d on %s, while blocked by thread LWP %d in procedure %s!  Expect a failure\n",
+			ast_get_tid(), ast_channel_name(chan), ast_channel_blocker_tid(chan),
+			ast_channel_blockproc(chan));
+		ast_assert(0);
 	}
 
 	if (ast_channel_tech(chan)->hangup) {
@@ -3661,7 +3661,6 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio, int
 			}
 		}
 	} else {
-		ast_channel_blocker_set(chan, pthread_self());
 		if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_EXCEPTION)) {
 			if (ast_channel_tech(chan)->exception)
 				f = ast_channel_tech(chan)->exception(chan);

main/channel_internal_api.c

@@ -165,6 +165,7 @@ struct ast_channel {
 	unsigned long insmpl;				/*!< Track the read/written samples for monitor use */
 	unsigned long outsmpl;				/*!< Track the read/written samples for monitor use */
 
+	int blocker_tid;					/*!< If anyone is blocking, this is their thread id */
 	AST_VECTOR(, int) fds;				/*!< File descriptors for channel -- Drivers will poll on
 							 *   these file descriptors, so at least one must be non -1.
 							 *   See \arg \ref AstFileDesc */
@@ -1178,6 +1179,15 @@ void ast_channel_blocker_set(struct ast_channel *chan, pthread_t value)
 	chan->blocker = value;
 }
 
+int ast_channel_blocker_tid(const struct ast_channel *chan)
+{
+	return chan->blocker_tid;
+}
+void ast_channel_blocker_tid_set(struct ast_channel *chan, int value)
+{
+	chan->blocker_tid = value;
+}
+
 ast_timing_func_t ast_channel_timingfunc(const struct ast_channel *chan)
 {
 	return chan->timingfunc;