[gdbserver] linux-low.c: better starvation avoidance, handle non-stop mode too

[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-low.h

diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index 482092960811d475e61b2451d80e1aee04f61bea..bea4a377ed848b6e71dd767e6c1586a1ff654633 100644 (file)
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -1,5 +1,5 @@
 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
-   Copyright (C) 2002-2014 Free Software Foundation, Inc.
+   Copyright (C) 2002-2015 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -230,6 +230,24 @@ extern struct linux_target_ops the_low_target;
 #define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
 #define get_lwp_thread(lwp) ((lwp)->thread)
 
+/* Reasons an LWP last stopped.  */
+
+enum lwp_stop_reason
+{
+  /* Either not stopped, or stopped for a reason that doesn't require
+     special tracking.  */
+  LWP_STOPPED_BY_NO_REASON,
+
+  /* Stopped by a software breakpoint.  */
+  LWP_STOPPED_BY_SW_BREAKPOINT,
+
+  /* Stopped by a hardware breakpoint.  */
+  LWP_STOPPED_BY_HW_BREAKPOINT,
+
+  /* Stopped by a watchpoint.  */
+  LWP_STOPPED_BY_WATCHPOINT
+};
+
 /* This struct is recorded in the target_data field of struct thread_info.
 
    On linux ``all_threads'' is keyed by the LWP ID, which we use as the
@@ -269,8 +287,9 @@ struct lwp_info
   /* When stopped is set, the last wait status recorded for this lwp.  */
   int last_status;
 
-  /* When stopped is set, this is where the lwp stopped, with
-     decr_pc_after_break already accounted for.  */
+  /* When stopped is set, this is where the lwp last stopped, with
+     decr_pc_after_break already accounted for.  If the LWP is
+     running, this is the address at which the lwp was resumed.  */
   CORE_ADDR stop_pc;
 
   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
@@ -278,9 +297,9 @@ struct lwp_info
   int status_pending_p;
   int status_pending;
 
-  /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
-     watchpoint trap.  */
-  int stopped_by_watchpoint;
+  /* The reason the LWP last stopped, if we need to track it
+     (breakpoint, watchpoint, etc.)  */
+  enum lwp_stop_reason stop_reason;
 
   /* On architectures where it is possible to know the data address of
      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
@@ -351,12 +370,6 @@ int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine);
    errno).  */
 int linux_attach_lwp (ptid_t ptid);
 
-/* Return the reason an attach failed, in string form.  ERR is the
-   error returned by linux_attach_lwp (an errno).  This string should
-   be copied into a buffer by the client if the string will not be
-   immediately used, or if it must persist.  */
-char *linux_attach_fail_reason_string (ptid_t ptid, int err);
-
 struct lwp_info *find_lwp_pid (ptid_t ptid);
 void linux_stop_lwp (struct lwp_info *lwp);