Revise MIPS 64-bit ptrace interface

[linux-2.6] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 38c8654aaa96b66d327a09aa2b2cf9effb49674d..27519df0f9876bfb1ced31d3998062ccd48c12e5 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -107,13 +107,25 @@ extern unsigned long nr_iowait(void);
 
 #include <asm/processor.h>
 
+/*
+ * Task state bitmask. NOTE! These bits are also
+ * encoded in fs/proc/array.c: get_task_state().
+ *
+ * We have two separate sets of flags: task->state
+ * is about runnability, while task->exit_state are
+ * about the task exiting. Confusing, but this way
+ * modifying one set can't modify the other one by
+ * mistake.
+ */
 #define TASK_RUNNING           0
 #define TASK_INTERRUPTIBLE     1
 #define TASK_UNINTERRUPTIBLE   2
 #define TASK_STOPPED           4
 #define TASK_TRACED            8
+/* in tsk->exit_state */
 #define EXIT_ZOMBIE            16
 #define EXIT_DEAD              32
+/* in tsk->state again */
 #define TASK_NONINTERACTIVE    64
 
 #define __set_task_state(tsk, state_value)             \
@@ -121,6 +133,17 @@ extern unsigned long nr_iowait(void);
 #define set_task_state(tsk, state_value)               \
        set_mb((tsk)->state, (state_value))
 
+/*
+ * set_current_state() includes a barrier so that the write of current->state
+ * is correctly serialised wrt the caller's subsequent test of whether to
+ * actually sleep:
+ *
+ *     set_current_state(TASK_UNINTERRUPTIBLE);
+ *     if (do_i_need_to_sleep())
+ *             schedule();
+ *
+ * If the caller does not need such serialisation then use __set_current_state()
+ */
 #define __set_current_state(state_value)                       \
        do { current->state = (state_value); } while (0)
 #define set_current_state(state_value)         \
@@ -995,6 +1018,7 @@ extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
 extern int kill_pg_info(int, struct siginfo *, pid_t);
 extern int kill_proc_info(int, struct siginfo *, pid_t);
+extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t);
 extern void do_notify_parent(struct task_struct *, int);
 extern void force_sig(int, struct task_struct *);
 extern void force_sig_specific(int, struct task_struct *);