ptos: thread: Add PsExitThread()

Signed-off-by: Chloe M <chloe@mensia.org>

service/ptos/head/ps/thread.h

@@ -36,6 +36,13 @@ typedef struct _THREAD {
     TAILQ_ENTRY(_THREAD) ThreadLink;
 } THREAD;
 
+/*
+ * Exit the current thread
+ *
+ * @ExitCode:  Exit code to terminate with
+ */
+NO_RETURN VOID PsExitThread(ULONG ExitCode);
+
 /*
  * Create a new thread
  *

service/ptos/ps/thread.c

@@ -9,11 +9,14 @@
 #include <ps/thread.h>
 #include <ps/process.h>
 #include <hal/thread.h>
+#include <hal/prim.h>
+#include <hal/kpcr.h>
 #include <ex/pool.h>
 #include <atomic.h>
 
 /* Globals */
 static UQUAD NextThreadTid = 0;
+static SCHED_QUEUE ReaperQueue;
 
 PT_STATUS
 PsCreateThread(struct _PROCESS *Parent, ULONG Flags, UPTR Ip, THREAD **Result)
@@ -46,3 +49,18 @@ PsCreateThread(struct _PROCESS *Parent, ULONG Flags, UPTR Ip, THREAD **Result)
     *Result = Thread;
     return STATUS_SUCCESS;
 }
+
+NO_RETURN VOID
+PsExitThread(ULONG ExitCode)
+{
+    KPCR *Kpcr;
+
+    Kpcr = HalKpcrCurrent();
+    KeSchedEnqueue(&ReaperQueue, Kpcr->CurrentThread);
+    Kpcr->CurrentThread = NULL;
+    HalThreadYield();
+
+    for (;;) {
+        HalCpuSuspend();
+    }
+}