From d52faadf73d8b66e39b1d5fde5d20d3cdce12d8c Mon Sep 17 00:00:00 2001
From: "Thiago Marcos P. Santos" <thiago@mapbox.com>
Date: Fri, 15 Jul 2016 12:18:08 +0300
Subject: [PATCH] [android] Set thread name properly

---
 platform/android/platform.gyp     |  2 +-
 platform/android/src/run_loop.cpp |  3 ++-
 platform/android/src/thread.cpp   | 37 +++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 platform/android/src/thread.cpp

diff --git a/platform/android/platform.gyp b/platform/android/platform.gyp
index c5b81c974..171fc0b51 100644
--- a/platform/android/platform.gyp
+++ b/platform/android/platform.gyp
@@ -31,7 +31,7 @@
         'src/log_android.cpp',
         'src/http_file_source.cpp',
         'src/asset_file_source.cpp',
-        '../default/thread.cpp',
+        'src/thread.cpp',
         '../default/string_stdlib.cpp',
         '../default/image.cpp',
         '../default/png_reader.cpp',
diff --git a/platform/android/src/run_loop.cpp b/platform/android/src/run_loop.cpp
index 007ea2919..1e5fc9b4b 100644
--- a/platform/android/src/run_loop.cpp
+++ b/platform/android/src/run_loop.cpp
@@ -1,5 +1,6 @@
 #include "run_loop_impl.hpp"
 
+#include <mbgl/platform/platform.hpp>
 #include <mbgl/util/thread_context.hpp>
 #include <mbgl/util/thread_local.hpp>
 #include <mbgl/util/timer.hpp>
@@ -75,7 +76,7 @@ private:
 
 RunLoop::Impl::Impl(RunLoop* runLoop_, RunLoop::Type type) : runLoop(runLoop_) {
     using namespace mbgl::android;
-    detach = attach_jni_thread(theJVM, &env, "");
+    detach = attach_jni_thread(theJVM, &env, platform::getCurrentThreadName());
 
     loop = ALooper_prepare(0);
     assert(loop);
diff --git a/platform/android/src/thread.cpp b/platform/android/src/thread.cpp
new file mode 100644
index 000000000..77f981586
--- /dev/null
+++ b/platform/android/src/thread.cpp
@@ -0,0 +1,37 @@
+#include <mbgl/platform/log.hpp>
+#include <mbgl/platform/platform.hpp>
+
+#include <sys/prctl.h>
+#include <sys/resource.h>
+
+// Implementation based on Chromium's platform_thread_android.cc.
+
+namespace mbgl {
+namespace platform {
+
+std::string getCurrentThreadName() {
+    char name[32] = "unknown";
+
+    if (prctl(PR_GET_NAME, name) == -1) {
+        Log::Warning(Event::General, "Couldn't get thread name");
+    }
+
+    return name;
+}
+
+void setCurrentThreadName(const std::string& name) {
+    if (prctl(PR_SET_NAME, name.c_str()) == -1) {
+        Log::Warning(Event::General, "Couldn't set thread name");
+    }
+}
+
+void makeThreadLowPriority() {
+    // ANDROID_PRIORITY_LOWEST = 19
+    //
+    // Supposedly would set the priority for the whole process, but
+    // on Linux/Android it only sets for the current thread.
+    setpriority(PRIO_PROCESS, 0, 19);
+}
+
+} // namespace platform
+} // namespace mbgl