add docs for syscalls. make syscall code kind-of cleaner

1 files changed, 30 insertions, 0 deletions

diff --git a/sys/lockstack.c b/sys/lockstack.c
new file mode 100644
index 0000000..7a419ac
--- /dev/null
+++ b/sys/lockstack.c
@@ -0,0 +1,30 @@
+#include "lockstack.h"
+#include "lib/printf.h"
+
+jove_owned_obj_t*
+lockstack_push(lockstack_t *stack, jove_owned_obj_t *obj)
+{
+    if(stack->depth == LOCKSTACK_MAX) {
+        klogf("lock stack exceeds %i entries\n", LOCKSTACK_MAX);
+        return NULL;
+    }
+    if(obj == NULL) return obj;
+
+    stack->stack[stack->depth++] = obj;
+    return obj;
+}
+
+jove_obj_t*
+lockstack_pop(lockstack_t *stack)
+{
+    return obj_release(stack->stack[--stack->depth]);
+}
+
+void
+lockstack_popall(lockstack_t *stack)
+{
+    for(size_t i = 0; i < stack->depth; i++)
+        obj_release(stack->stack[i]);
+    stack->depth = 0;
+}
+