* 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.
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