liblog: add android_log_logger_list management
Add list of android_log_logger_list entities as a way of
accessing the list of transport contexts from within
one of the transports. This will enable us to iterate back
to an internal transport context which may house a last index
or signalling semaphore to propagate a wakeup on a blocking
read.
Test: gTest libcutils-tests, logd-unit-tests, liblog-unit-tests,
logcat-unit-tests
Bug: 27405083
Change-Id: I0a5e793946c020d97ffe10192369998e4ed92a83
diff --git a/liblog/logger.h b/liblog/logger.h
index d332c03..471a529 100644
--- a/liblog/logger.h
+++ b/liblog/logger.h
@@ -99,6 +99,7 @@
};
struct android_log_logger_list {
+ struct listnode node;
struct listnode logger;
struct listnode transport;
int mode;
@@ -146,6 +147,41 @@
(logp) = node_to_item((logp)->node.next, \
struct android_log_logger, node))
+/*
+ * Global list of log readers.
+ *
+ * Usage case: search out transport contexts for all readers
+ */
+
+LIBLOG_HIDDEN struct listnode __android_log_readers;
+
+#if defined(_WIN32)
+#define logger_list_rdlock()
+#define logger_list_wrlock()
+#define logger_list_unlock()
+#else
+LIBLOG_HIDDEN pthread_rwlock_t __android_log_readers_lock;
+
+#define logger_list_rdlock() pthread_rwlock_rdlock(&__android_log_readers_lock)
+#define logger_list_wrlock() pthread_rwlock_wrlock(&__android_log_readers_lock)
+#define logger_list_unlock() pthread_rwlock_unlock(&__android_log_readers_lock)
+#endif
+
+/* Must be called with logger_list_rdlock() or logger_list_wrlock() held */
+#define logger_list_for_each(logger_list) \
+ for ((logger_list) = node_to_item(&__android_log_readers, \
+ struct android_log_logger_list, \
+ node); \
+ (logger_list) != node_to_item(&__android_log_readers, \
+ struct android_log_logger_list, \
+ node) && \
+ (logger_list) != node_to_item((logger_list)->node.next, \
+ struct android_log_logger_list, \
+ node); \
+ (logger_list) = node_to_item((logger_list)->node.next, \
+ struct android_log_logger_list, \
+ node))
+
/* OS specific dribs and drabs */
#if defined(_WIN32)