disable-threaded-io.patch

commit f897929a4616f0b0a88bab36c7fc2a9c5bbb3365
Author: LekKit <50500857+LekKit@users.noreply.github.com>
Date:   Fri Mar 22 10:05:07 2024 +0200

    Disable threaded IO on Serenity

diff --git a/src/threading.c b/src/threading.c
index 98883ed..705749c 100644
--- a/src/threading.c
+++ b/src/threading.c
@@ -318,6 +318,12 @@ void condvar_free(cond_var_t* cond)
 
 // Threadpool task offloading
 
+// Serenity has serious scheduler issues that cause threadpool to
+// perform very poorly when vCPU is not sleeping.
+// Basically a thread that uses 100% of CPU on Serenity somehow
+// monopolizes host CPU so threadpool/eventloop tasks are timing out.
+
+#ifndef __serenity__
 #define WORKER_THREADS 4
 #define WORKQUEUE_SIZE 2048
 #define WORKQUEUE_MASK (WORKQUEUE_SIZE - 1)
@@ -440,8 +446,11 @@ static void* threadpool_worker(void* ptr)
     return ptr;
 }
 
+#endif
+
 static bool thread_queue_task(thread_func_t func, void** arg, unsigned arg_count, bool va)
 {
+#ifndef __serenity__
     DO_ONCE ({
         atomic_store_uint32_ex(&pool_run, 1, ATOMIC_RELAXED);
         workqueue_init(&pool_wq);
@@ -461,6 +470,9 @@ static bool thread_queue_task(thread_func_t func, void** arg, unsigned arg_count
     // Still not queued!
     // Assuming entire threadpool is busy, just do a blocking task
     DO_ONCE(rvvm_warn("Blocking on workqueue task %p", func));
+#else
+    UNUSED(func); UNUSED(arg); UNUSED(arg_count); UNUSED(va);
+#endif
     return false;
 }