GL_ARB_sync
http://www.opengl.org/registry/specs/ARB/sync.txt
GL_ARB_sync
	GL_SYNC_FLUSH_COMMANDS_BIT 0x00000001
	GL_MAX_SERVER_WAIT_TIMEOUT 0x9111
	GL_OBJECT_TYPE 0x9112
	GL_SYNC_CONDITION 0x9113
	GL_SYNC_STATUS 0x9114
	GL_SYNC_FLAGS 0x9115
	GL_SYNC_FENCE 0x9116
	GL_SYNC_GPU_COMMANDS_COMPLETE 0x9117
	GL_UNSIGNALED 0x9118
	GL_SIGNALED 0x9119
	GL_ALREADY_SIGNALED 0x911A
	GL_TIMEOUT_EXPIRED 0x911B
	GL_CONDITION_SATISFIED 0x911C
	GL_WAIT_FAILED 0x911D
	GL_TIMEOUT_IGNORED 0xFFFFFFFFFFFFFFFF
	GLenum glClientWaitSync (GLsync GLsync,GLbitfield flags,GLuint64 timeout)
	void glDeleteSync (GLsync GLsync)
	GLsync glFenceSync (GLenum condition,GLbitfield flags)
	void glGetInteger64v (GLenum pname, GLint64* params)
	void glGetSynciv (GLsync GLsync,GLenum pname,GLsizei bufSize,GLsizei* length, GLint *values)
	GLboolean glIsSync (GLsync GLsync)
	void glWaitSync (GLsync GLsync,GLbitfield flags,GLuint64 timeout)