From 41cba1de51b328979ff2d0261b4141bb4e128fe6 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Fri, 15 Jan 2021 16:34:19 +0100
Subject: Implemented basic dev ready-state waiting

---
 kernel/features/proc.c    | 17 ++++++++++++++++-
 kernel/features/syscall.c |  7 ++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

(limited to 'kernel/features')

diff --git a/kernel/features/proc.c b/kernel/features/proc.c
index f792824..af6a307 100644
--- a/kernel/features/proc.c
+++ b/kernel/features/proc.c
@@ -105,7 +105,7 @@ void proc_exit(struct proc *proc, int status)
 
 	int res = 0;
 	struct node *iterator = proc_list->head;
-	while (iterator != NULL) {
+	while (iterator) {
 		if (iterator->data == proc) {
 			res = 1;
 			list_remove(proc_list, iterator);
@@ -131,6 +131,21 @@ void proc_yield(struct regs *r)
 	scheduler(r);
 }
 
+void proc_enable_waiting(u32 dev_id)
+{
+	printf("ENABLING %d\n", dev_id);
+	struct node *iterator = proc_list->head;
+	while (iterator) {
+		struct proc *p = iterator->data;
+		printf("\t-> %s: %d\n", p->name, p->waits_for);
+		if (p && p->waits_for && p->waits_for == dev_id) {
+			//printf("WAKING %s\n", p->name);
+			p->state = PROC_RUNNING;
+		}
+		iterator = iterator->next;
+	}
+}
+
 struct proc *proc_make(void)
 {
 	struct proc *proc = malloc(sizeof(*proc));
diff --git a/kernel/features/syscall.c b/kernel/features/syscall.c
index c5570c3..59965a5 100644
--- a/kernel/features/syscall.c
+++ b/kernel/features/syscall.c
@@ -40,8 +40,13 @@ void syscall_handler(struct regs *r)
 		if (vfs_ready((char *)r->ebx)) {
 			r->eax = (u32)vfs_read((char *)r->ebx, (void *)r->ecx, r->edx, r->esi);
 		} else {
-			proc_current()->state = PROC_SLEEPING;
+			struct proc *p = proc_current();
+			p->state = PROC_SLEEPING;
+			p->waits_for = vfs_find_dev((char *)r->ebx)->id;
 			scheduler(r);
+			sti();
+			while (1)
+				hlt();
 		}
 		break;
 	}
-- 
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