diff --git a/include/l4/generic/tcb.h b/include/l4/generic/tcb.h
index 82fa4b3..37a77da 100644
--- a/include/l4/generic/tcb.h
+++ b/include/l4/generic/tcb.h
@@ -51,6 +51,7 @@ typedef struct arm_context {
 struct task_ids {
 	l4id_t tid;
 	l4id_t spid;
+	l4id_t tgid;
 };
 
 struct ktcb {
@@ -70,6 +71,7 @@ struct ktcb {
 	/* Thread information */
 	l4id_t tid;		/* Global thread id */
 	l4id_t spid;		/* Global space id */
+	l4id_t tgid;		/* Global thread group id */
 
 	/* Flags to hint scheduler on future task state */
 	unsigned int schedfl;
@@ -140,14 +142,17 @@ static inline void set_task_ids(struct ktcb *task, struct task_ids *ids)
 {
 	task->tid = ids->tid;
 	task->spid = ids->spid;
+	task->tgid = ids->tgid;
 }
 
 #define THREAD_IDS_MAX		1024
 #define SPACE_IDS_MAX		1024
+#define TGROUP_IDS_MAX		1024
 
 
 extern struct id_pool *thread_id_pool;
 extern struct id_pool *space_id_pool;
+extern struct id_pool *tgroup_id_pool;
 
 #endif /* __TCB_H__ */
 
diff --git a/src/api/syscall.c b/src/api/syscall.c
index b25df95..380259e 100644
--- a/src/api/syscall.c
+++ b/src/api/syscall.c
@@ -71,6 +71,8 @@ int sys_getid(syscall_context_t *regs)
 
 	ids->tid = this->tid;
 	ids->spid = this->spid;
+	ids->tgid = this->tgid;
+
 	return 0;
 }
 
diff --git a/src/api/thread.c b/src/api/thread.c
index e3e7192..6c75890 100644
--- a/src/api/thread.c
+++ b/src/api/thread.c
@@ -175,6 +175,12 @@ out:
 		if ((ids->spid = id_get(space_id_pool,
 					ids->spid)) < 0)
 			ids->spid = id_new(space_id_pool);
+
+		/* It also gets a thread group id */
+		if ((ids->tgid = id_get(tgroup_id_pool,
+					ids->tgid)) < 0)
+			ids->tgid = id_new(tgroup_id_pool);
+
 	}
 
 	/* Set all ids */
diff --git a/src/generic/tcb.c b/src/generic/tcb.c
index cde6f72..fa4d2b5 100644
--- a/src/generic/tcb.c
+++ b/src/generic/tcb.c
@@ -10,6 +10,7 @@
 /* ID pools for threads and spaces. */
 struct id_pool *thread_id_pool;
 struct id_pool *space_id_pool;
+struct id_pool *tgroup_id_pool;
 
 /* Hash table for all existing tasks */
 struct list_head global_task_list;
diff --git a/src/glue/arm/init.c b/src/glue/arm/init.c
index 4088a7d..045ff95 100644
--- a/src/glue/arm/init.c
+++ b/src/glue/arm/init.c
@@ -331,8 +331,10 @@ void init_tasks()
 	/* Initialise thread and space id pools */
 	thread_id_pool = id_pool_new_init(THREAD_IDS_MAX);
 	space_id_pool = id_pool_new_init(SPACE_IDS_MAX);
+	tgroup_id_pool = id_pool_new_init(TGROUP_IDS_MAX);
 	ids.tid = id_new(thread_id_pool);
 	ids.spid = id_new(space_id_pool);
+	ids.tgid = id_new(tgroup_id_pool);
 
 	/* Initialise the global task list head */
 	INIT_LIST_HEAD(&global_task_list);
diff --git a/tasks/libl4/include/l4lib/arch-arm/types.h b/tasks/libl4/include/l4lib/arch-arm/types.h
index 8ead25a..c7a474a 100644
--- a/tasks/libl4/include/l4lib/arch-arm/types.h
+++ b/tasks/libl4/include/l4lib/arch-arm/types.h
@@ -5,6 +5,7 @@
 struct task_ids {
 	int tid;
 	int spid;
+	int tgid;
 };
 
 #include <l4/arch/arm/types.h>