kernel threads

kernel threads and preemptive multitasking

src/include/kernel/sched.h

@@ -5,18 +5,29 @@
 #include <arch/regs.h>
 #include <kernel/vfs.h>
 
+#define THREAD_PRIORITY_INTERRUPT 0
+#define THREAD_PRIORITY_KERNEL 1
+#define THREAD_PRIORITY_USER 2
+
 #define THREAD_STATE_WAITING 0
 #define THREAD_STATE_RUNNING 1
 #define THREAD_STATE_BLOCKED 2
 
+typedef unsigned long state_t;
+
 struct _proc_t;
 
 typedef struct _thread_t{
 	struct _thread_t* next;
+	struct _thread_t* prev;
 	struct _proc_t* proc;
 	arch_regs* regs;
-	size_t state;
+	state_t state;
 	void* kernelstack;
+	void* kernelstackbase;
+	size_t stacksize;
+	pid_t tid;
+	int priority;
 } thread_t;
 
 typedef struct _proc_t{
@@ -26,8 +37,19 @@ typedef struct _proc_t{
 	pid_t pid;
 	gid_t gid;
 	uid_t uid;
+	thread_t** threads;
+	size_t threadcount;
 	dirnode_t* root;
 	dirnode_t* cwd;
 } proc_t;
 
+
+typedef struct{
+	thread_t* start;
+	thread_t* end;
+	int lock;
+} sched_queue;
+
+void sched_init();
+
 #endif

src/include/kernel/timer.h

@@ -1,6 +1,7 @@
 #ifndef _TIMER_H_INCLUDE
 #define _TIMER_H_INCLUDE
 
+#include <stdbool.h>
 #include <stddef.h>
 #include <arch/regs.h>
 
@@ -14,7 +15,7 @@ typedef struct _timer_req{
 } timer_req;
 
 void timer_init();
-void timer_add(timer_req* req, size_t us);
+void timer_add(timer_req* req, size_t us, bool start);
 void timer_resume();
 void timer_stop();
 void timer_irq(arch_regs* ctx);

src/include/stdio/vprintf.c

@@ -11,7 +11,6 @@
 
 typedef int wint_t;
 
-bool ignoresign = false;
 
 char* __int_str(uintmax_t i, char b[], int base, bool plusSignIfNeeded, bool spaceSignIfNeeded,
                 int paddingNo, bool justify, bool zeroPad) {
@@ -262,10 +261,8 @@ int vprintf (const char* format, va_list list)
                         {
 
                             size_t integer = va_arg(list, size_t);
-                        ignoresign = true;
 			__int_str(integer, intStrBuffer, base, plusSign, spaceNoSign, lengthSpec, leftJustify, zeroPad);
                             displayString(intStrBuffer, &chars);
-                            ignoresign = false;
 			    break;
                         }
                         case 't':