[Minios-devel] [UNIKRAFT PATCH 14/23] lib/uksched: Add scheduling related private info on threads

[Costin Lupu <costin.lupu@xxxxxxxxx>]

We introduce `sched_prv` field which will be used for keeping scheduler private
information on each thread. One such example is keeping thread priorities and
time slices for preemptive scheduling.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 lib/uksched/include/uk/thread.h | 1 +
 lib/uksched/sched.c             | 2 ++
 lib/uksched/thread.c            | 1 +
 3 files changed, 4 insertions(+)

diff --git a/lib/uksched/include/uk/thread.h b/lib/uksched/include/uk/thread.h
index cf10b438..3c622d7f 100644
--- a/lib/uksched/include/uk/thread.h
+++ b/lib/uksched/include/uk/thread.h
@@ -58,6 +58,7 @@ struct uk_thread {
        bool detached;
        struct uk_waitq waiting_threads;
        struct uk_sched *sched;
+       void *sched_prv;
        void *prv;
 #ifdef CONFIG_LIBNEWLIBC
        struct _reent reent;
diff --git a/lib/uksched/sched.c b/lib/uksched/sched.c
index 66a7656b..7422da6b 100644
--- a/lib/uksched/sched.c
+++ b/lib/uksched/sched.c
@@ -249,6 +249,8 @@ void uk_sched_thread_destroy(struct uk_sched *sched, struct 
uk_thread *thread)
        UK_ASSERT(is_exited(thread));
 
        UK_TAILQ_REMOVE(&sched->exited_threads, thread, thread_list);
+       if (thread->sched_prv)
+               uk_free(sched->allocator, thread->sched_prv);
        uk_thread_fini(thread, sched->allocator);
        uk_pfree(sched->allocator, thread->stack, STACK_SIZE_PAGE_ORDER);
        if (thread->tls)
diff --git a/lib/uksched/thread.c b/lib/uksched/thread.c
index 53a4ba48..60ebcdc5 100644
--- a/lib/uksched/thread.c
+++ b/lib/uksched/thread.c
@@ -113,6 +113,7 @@ int uk_thread_init(struct uk_thread *thread,
        thread->detached = false;
        uk_waitq_init(&thread->waiting_threads);
        thread->sched = NULL;
+       thread->sched_prv = NULL;
        thread->prv = NULL;
 
 #ifdef CONFIG_LIBNEWLIBC
-- 
2.20.1


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