Changeset 6a0e568 in mainline for kernel/generic/src/proc/thread.c

Timestamp:

2024-01-19T16:56:48Z (18 months ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

286da52

Parents:

c1eaec4

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-02-22 18:04:40)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2024-01-19 16:56:48)

Message:

Allow fast-switch to another runnable thread

When a thread is available that can be switched to immediately
without having to block, do so without a detour through CPU
scheduler context. The new thread will handle whatever cannot
be done while the previous context is active on a CPU, such as
requeuing the thread or deallocation.

File:

• kernel/generic/src/proc/thread.c (modified) (2 diffs)

kernel/generic/src/proc/thread.c

@@ -108 +108 @@
 static int threads_cmp(void *, void *);
 
-/** Thread wrapper.
- *
- * This wrapper is provided to ensure that every thread makes a call to
- * thread_exit() when its implementing function returns.
- *
- * interrupts_disable() is assumed.
- *
- */
-static void cushion(void)
-{
-        void (*f)(void *) = THREAD->thread_code;
-        void *arg = THREAD->thread_arg;
-
-        /* This is where each thread wakes up after its creation */
-        interrupts_enable();
-
-        f(arg);
-
-        thread_exit();
-
-        /* Not reached */
-}
-
 /** Initialization and allocation for thread_t structure
  *
@@ -309 +286 @@
         irq_spinlock_unlock(&tidlock, true);
 
-        context_create(&thread->saved_context, cushion, thread->kstack, STACK_SIZE);
+        context_create(&thread->saved_context, thread_main_func,
+            thread->kstack, STACK_SIZE);
 
         current_initialize((current_t *) thread->kstack);