Commit 519b44c8 authored Aug 14, 2019 by Yiwei Zhang

libvulkan: ensure layer discovery is triggered only once for a new process

After decoupling layer discovery from driver loading, the layer discovery is
triggered at each call of vkCreateInstance, vkEnumerateInstanceLayerProperties
and vkEnumerateInstanceExtensionProperties. However, it takes non-trivial time
to traverse the layer search path for priviledged apps and non-updated system
apps. So this change just makes sure the layer discovery logic is triggered only
once for a new process.

Bug: 139443653
Bug: 135536511
Test: preload Vulkan and atest CtsGpuToolsHostTestCases
Change-Id: Ibe502fd4b089acbbff6f4a2485fa61c736a484b5

parent b215bf6c

vulkan/libvulkan/api.cpp

+5 −1

Original line number	Diff line number	Diff line
		@@ -1177,10 +1177,14 @@ bool EnsureInitialized() {
		});

		{
		static pid_t pid = getpid() + 1;
		static std::mutex layer_lock;
		std::lock_guard<std::mutex> lock(layer_lock);
		if (pid != getpid()) {
		pid = getpid();
		DiscoverLayers();
		}
		}

		return initialized;
		}