* target.h (TARGET_WNOHANG): New.

	* target.c (target_wait): Add `options' argument.  Adjust.
	(struct target_ops) <to_wait>: Add `options' argument.
	(target_wait): Add `options' argument.
	* infrun.c (wait_for_inferior): Pass 0 as options to
	target_wait (blocking wait).
	(fetch_inferior_event): Pass TARGET_WNOHANG as options to
	target_wait.
	* fork-child.c (startup_inferior): Pass 0 as options to
	target_wait (blocking wait).
	* linux-nat.c (linux_nat_create_inferior): Remove async masking.
	(linux_nat_wait_1): Add `target_options' argument.  Use it instead
	of checking on target_can_async_p.
	(linux_nat_wait): Add `target_options' argument.  Adjust.
	* remote.c (remote_wait_ns): Add `options' argument.  Adjust to
	check on TARGET_WNOWAIT instead of checking on remote_is_async_p.
	(remote_wait_as): Add `options' argument.  Adjust to check on
	TARGET_WNOWAIT instead of checking on remote_is_async_p.  If doing
	a blocking wait, keep waiting until an interesting event comes
	out.
	(remote_wait): Add `options' argument.  Don't loop here if the
	target is in async mode, and a blocking wait has been requested.

	* top.c (deprecated_target_wait_hook): Add `options' argument.
	* linux-thread-db.c (thread_db_wait): Add `options' argument, and
	pass it down to the layer beneath.
	* inf-ptrace.c (inf_ptrace_wait): Add `options' argument.
	* record.c (record_beneath_to_wait): Add `options' argument.
	(record_wait): Add `options' argument, and pass it down to the
	layer beneath.
	* bsd-uthread.c (bsd_uthread_wait): Add `options' argument.
	* darwin-nat.c (darwin_wait): Likewise.
	* defs.h (deprecated_target_wait_hook): Likewise.
	* gnu-nat.c (gnu_wait): Add `options' argument.
	* go32-nat.c (go32_wait): Likewise.
	* hpux-thread.c (hpux_thread_wait): Add `options' argument, and
	pass it down to the layer beneath.
	* inf-ttrace.c (inf_ttrace_wait): Add `options' argument.
	* monitor.c (monitor_wait): Likewise.
	* nto-procfs.c (procfs_wait): Likewise.
	* remote-mips.c (mips_wait): Add `options' argument.
	* remote-sim.c (gdbsim_wait): Likewise.
	* rs6000-nat.c (rs6000_wait): Add `options' argument.
	* sol-thread.c (sol_thread_wait): Add `options' argument, and pass
	it down to the layer beneath.
	* spu-linux-nat.c (spu_child_wait): Add `options' argument.
	* windows-nat.c (windows_wait): Likewise.
	* tui/tui-hooks.c (tui_target_wait_hook): Likewise.  Adjust.

1 files changed, 12 insertions, 3 deletions

diff --git a/gdb/target.h b/gdb/target.h
index b94149a..5ec06a0 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -153,6 +153,13 @@ struct target_waitstatus
     value;
   };
 
+/* Options that can be passed to target_wait.  */
+
+/* Return immediately if there's no event already queued.  If this
+   options is not requested, target_wait blocks waiting for an
+   event.  */
+#define TARGET_WNOHANG 1
+
 /* Return a pretty printed form of target_waitstatus.
    Space for the result is malloc'd, caller must free.  */
 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
@@ -327,7 +334,7 @@ struct target_ops
     void (*to_disconnect) (struct target_ops *, char *, int);
     void (*to_resume) (struct target_ops *, ptid_t, int, enum target_signal);
     ptid_t (*to_wait) (struct target_ops *,
-		      ptid_t, struct target_waitstatus *);
+		       ptid_t, struct target_waitstatus *, int);
     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
     void (*to_store_registers) (struct target_ops *, struct regcache *, int);
     void (*to_prepare_to_store) (struct regcache *);
@@ -621,9 +628,11 @@ extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
    _NOT_ OK to throw_exception() out of target_wait() without popping
    the debugging target from the stack; GDB isn't prepared to get back
    to the prompt with a debugging target but without the frame cache,
-   stop_pc, etc., set up.  */
+   stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
+   options.  */
 
-extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status);
+extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
+			   int options);
 
 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */