diff options
Diffstat (limited to 'libcutils/trace.c')
| -rw-r--r-- | libcutils/trace.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libcutils/trace.c b/libcutils/trace.c index 15c8a98..152ea61 100644 --- a/libcutils/trace.c +++ b/libcutils/trace.c @@ -33,6 +33,7 @@ int32_t atrace_is_ready = 0; int atrace_marker_fd = -1; uint64_t atrace_enabled_tags = ATRACE_TAG_NOT_READY; static pthread_once_t atrace_once_control = PTHREAD_ONCE_INIT; +static pthread_mutex_t atrace_tags_mutex = PTHREAD_MUTEX_INITIALIZER; // Read the sysprop and return the value tags should be set to static uint64_t atrace_get_property() @@ -54,6 +55,18 @@ static uint64_t atrace_get_property() return (tags | ATRACE_TAG_ALWAYS) & ATRACE_TAG_VALID_MASK; } +// Update tags if tracing is ready. Useful as a sysprop change callback. +void atrace_update_tags() +{ + uint64_t tags; + if (CC_UNLIKELY(android_atomic_acquire_load(&atrace_is_ready))) { + tags = atrace_get_property(); + pthread_mutex_lock(&atrace_tags_mutex); + atrace_enabled_tags = tags; + pthread_mutex_unlock(&atrace_tags_mutex); + } +} + static void atrace_init_once() { atrace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY); |