From 4ddca59e2c07a98988ffb07571d2b35c4c90f5ac Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Fri, 28 Sep 2018 01:52:07 +0200
Subject: reactiveate threads. allow user space access to framebuffer

---
 kernel/scheduler.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

(limited to 'kernel/scheduler.c')

diff --git a/kernel/scheduler.c b/kernel/scheduler.c
index 20b69ed..0c24f94 100644
--- a/kernel/scheduler.c
+++ b/kernel/scheduler.c
@@ -35,6 +35,7 @@ static uint32_t nextPID()
 
 // we hold this stuff per cpu
 static volatile uint32_t current_task[SMP_MAX_PROC];
+static volatile uint32_t last_task[SMP_MAX_PROC]; // last non ring1 task
 
 // we hold this stuff per cpu
 static volatile struct task_list_struct
@@ -69,6 +70,7 @@ volatile void scheduler_init(uint32_t cpu, void *dir)
     }
 
     current_task[cpu]=0;
+    last_task[cpu]=0;
    
     // need to make space on the esp stacks for pushing vals vias task_pusha
     
@@ -117,6 +119,8 @@ static uint32_t scheduler_schedule(uint32_t idx)
 	uint32_t cpu=smp_get(SMP_APIC_ID);
 	if(task_list[cpu][idx].active && !task_list[cpu][idx].syscall)
 	{
+            if(current_task[cpu]!=0)last_task[cpu]=current_task[cpu];
+
 	    current_task[cpu]=idx;
 	    install_tss(cpu,task_list[cpu][idx].esp0);
 	    x86_set_page_directory(task_list[cpu][idx].vmem);
@@ -150,19 +154,21 @@ volatile uint32_t scheduler_run(uint32_t oldesp,uint32_t preference)
 
     uint32_t esp;
     esp=scheduler_schedule(preference); // try preference
+
     if(esp)return esp;
 
     for(int i=0;i<MAX_TASKS;i++)
     {
-	int idx=(current_task[cpu]+1+i)%MAX_TASKS; // schedule round robin style
-	if(idx==2)continue;// skip sleeper here
+	int idx=(last_task[cpu]+1+i)%MAX_TASKS; // schedule round robin style
 
-	esp=scheduler_schedule(idx); // try preference
-	if(esp)return esp;
+	if(idx==preference||idx==2)continue;// skip sleeper and preferred tasks here.
 
+	esp=scheduler_schedule(idx);
+
+	if(esp)return esp;
     }
 
-    // force the sleeper task
+    // force the sleeper task...
     return scheduler_schedule(2);
 
 }
@@ -455,5 +461,5 @@ void task_exit(uint32_t pid)
            task_list[cpu][i].active=false;
     }
 
-    vmem_free_space_dir(task_list[cpu][idx].vmem,false);
+    vmem_free_space_dir(task_list[cpu][idx].vmem,task_list[cpu][idx].thread);
 }
-- 
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