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| author | Pedro Alves <palves@redhat.com> | 2015-08-07 17:23:56 +0100 |
|---|---|---|
| committer | Pedro Alves <palves@redhat.com> | 2015-08-07 17:23:56 +0100 |
| commit | 567420d10895611e03d5ee65e6b24c16a69a6e99 (patch) | |
| tree | b4c7c3195515ddb92fd249d1e6ae1ccd09379a1c | |
| parent | d8dd4d5fe6d5ab971b731df5f65025a0dbbdb912 (diff) | |
| download | gdb-567420d10895611e03d5ee65e6b24c16a69a6e99.zip gdb-567420d10895611e03d5ee65e6b24c16a69a6e99.tar.gz gdb-567420d10895611e03d5ee65e6b24c16a69a6e99.tar.bz2 | |
remote.c/all-stop: Implement TARGET_WAITKIND_NO_RESUMED and TARGET_WNOHANG
Even though "target remote" supports target-async, the all-stop
target_wait implementation ignores TARGET_WNOHANG. If the core
happens to poll for events and we've already read the stop reply out
of the serial/socket, remote_wait_as hangs forever instead of
returning an indication that there are no events to process. This
can't happen currently, but later changes will trigger this.
gdb/ChangeLog:
2015-08-07 Pedro Alves <palves@redhat.com>
* remote.c (remote_wait_as): If not waiting for a stop reply,
return TARGET_WAITKIND_NO_RESUMED. If TARGET_WNOHANG is
requested, don't block waiting forever.
| -rw-r--r-- | gdb/ChangeLog | 6 | ||||
| -rw-r--r-- | gdb/remote.c | 13 |
2 files changed, 18 insertions, 1 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 7bec9c8..5bf3d75 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2015-08-07 Pedro Alves <palves@redhat.com> + + * remote.c (remote_wait_as): If not waiting for a stop reply, + return TARGET_WAITKIND_NO_RESUMED. If TARGET_WNOHANG is + requested, don't block waiting forever. + 2015-08-07 Pedro Alves <pedro@codesourcery.com> * infrun.c (adjust_pc_after_break): Now takes thread_info and diff --git a/gdb/remote.c b/gdb/remote.c index c047f35..4b5eb8e 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -6267,6 +6267,14 @@ remote_wait_as (ptid_t ptid, struct target_waitstatus *status, int options) { int ret; int is_notif; + int forever = ((options & TARGET_WNOHANG) == 0 + && wait_forever_enabled_p); + + if (!rs->waiting_for_stop_reply) + { + status->kind = TARGET_WAITKIND_NO_RESUMED; + return minus_one_ptid; + } if (!target_is_async_p ()) { @@ -6285,7 +6293,7 @@ remote_wait_as (ptid_t ptid, struct target_waitstatus *status, int options) However, before we do that we need to ensure that the caller knows how to take the target into/out of async mode. */ ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size, - wait_forever_enabled_p, &is_notif); + forever, &is_notif); if (!target_is_async_p ()) signal (SIGINT, ofunc); @@ -6294,6 +6302,9 @@ remote_wait_as (ptid_t ptid, struct target_waitstatus *status, int options) not interesting. */ if (ret != -1 && is_notif) return minus_one_ptid; + + if (ret == -1 && (options & TARGET_WNOHANG) != 0) + return minus_one_ptid; } buf = rs->buf; |