emulator/opengl: Remove Android-specific thread_store.

This patch removes the use of the 'thread_store' class from
<utils/threads.h> by providing its own implementation instead
under shared/emugl/common/thread_store.h, plus appropriate
unit tests.

Note that unlike the Android version, this properly destroys
the thread-local values on thread exit (instead of leaking
them).

+ Provide a LazyInstance class used to perform thread-safe
  lazy initialization of static variables without the use
  of C++ constructors.

Change-Id: Iabe01fbd713c6872b5fe245d7255c3c03749a88a

1 files changed, 15 insertions, 4 deletions

diff --git a/emulator/opengl/host/libs/libOpenglRender/ThreadInfo.cpp b/emulator/opengl/host/libs/libOpenglRender/ThreadInfo.cpp
index 566ca40..5337009 100644
--- a/emulator/opengl/host/libs/libOpenglRender/ThreadInfo.cpp
+++ b/emulator/opengl/host/libs/libOpenglRender/ThreadInfo.cpp
@@ -15,17 +15,28 @@
 */
 
 #include "ThreadInfo.h"
-#include <cutils/threads.h>
+#include "emugl/common/lazy_instance.h"
+#include "emugl/common/thread_store.h"
 
-static thread_store_t s_tls = THREAD_STORE_INITIALIZER;
+namespace {
+
+class ThreadInfoStore : public ::emugl::ThreadStore {
+public:
+    ThreadInfoStore() : ::emugl::ThreadStore(NULL) {}
+};
+
+}  // namespace
+
+static ::emugl::LazyInstance<ThreadInfoStore> s_tls = LAZY_INSTANCE_INIT;
 
 RenderThreadInfo::RenderThreadInfo() {
-    thread_store_set(&s_tls, this, NULL);
+    s_tls->set(this);
 }
 
 RenderThreadInfo::~RenderThreadInfo() {
+    s_tls->set(NULL);
 }
 
 RenderThreadInfo* RenderThreadInfo::get() {
-    return (RenderThreadInfo*)thread_store_get(&s_tls);
+    return static_cast<RenderThreadInfo*>(s_tls->get());
 }