lower thread priority of worker threads

3 files changed, 25 insertions, 1 deletions

diff --git a/platform/darwin/nsthread.mm b/platform/darwin/nsthread.mm
new file mode 100644
index 0000000000..9ac1d2caa0
--- /dev/null
+++ b/platform/darwin/nsthread.mm
@@ -0,0 +1,13 @@
+#import <Foundation/Foundation.h>
+
+#include <mbgl/platform/platform.hpp>
+
+namespace mbgl {
+namespace platform {
+
+void makeThreadLowPriority() {
+    [[NSThread currentThread] setThreadPriority:0.0];
+}
+
+}
+}
diff --git a/platform/default/sqlite_cache.cpp b/platform/default/sqlite_cache.cpp
index 83d42d5a5c..fb4cdf74e7 100644
--- a/platform/default/sqlite_cache.cpp
+++ b/platform/default/sqlite_cache.cpp
@@ -62,7 +62,7 @@ std::string unifyMapboxURLs(const std::string &url) {
 using namespace mapbox::sqlite;
 
 SQLiteCache::SQLiteCache(const std::string& path_)
-    : thread(util::make_unique<util::Thread<Impl>>("SQLite Cache", path_)) {
+    : thread(util::make_unique<util::Thread<Impl>>("SQLite Cache", util::ThreadPriority::Low, path_)) {
 }
 
 SQLiteCache::~SQLiteCache() = default;
diff --git a/platform/default/thread.cpp b/platform/default/thread.cpp
new file mode 100644
index 0000000000..c0a1069b9c
--- /dev/null
+++ b/platform/default/thread.cpp
@@ -0,0 +1,11 @@
+#include <mbgl/platform/platform.hpp>
+
+namespace mbgl {
+namespace platform {
+
+void makeThreadLowPriority() {
+    // no-op
+}
+
+}
+}