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Proof-read comments on w32notify.c. Adapt NEWS entry.

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Eli Zaretskii 2012-12-10 14:38:49 +02:00
parent 3907e630a7
commit f282b9f798
2 changed files with 22 additions and 16 deletions
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3
etc/NEWS
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@ -136,7 +136,8 @@ spurious warnings about an unused var.
** Support for filesystem notifications.
Emacs now supports notifications of filesystem changes, such as
creation, modification, and deletion of files. This requires the
'inotify' API on GNU/Linux systems.
'inotify' API on GNU/Linux systems. On MS-Windows systems, this is
supported for Windows XP and newer versions.
** Face changes

35
src/w32notify.c
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@ -16,15 +16,18 @@ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Design overview:
/* Written by Eli Zaretskii <eliz@gnu.org>.
Design overview:
For each watch request, we launch a separate worker thread. The
worker thread runs the watch_worker function, which issues an
asynchronous call to ReadDirectoryChangesW, and then waits for that
call to complete in SleepEx. Waiting in SleepEx puts the thread in
an alertable state, so it wakes up when either (a) the call to
ReadDirectoryChangesW completes, or (b) the main thread instructs
the worker thread to terminate by sending it an APC, see below.
asynchronous call to ReadDirectoryChangesW, and then waits in
SleepEx for that call to complete. Waiting in SleepEx puts the
thread in an "alertable" state, so it wakes up when either (a) the
call to ReadDirectoryChangesW completes, or (b) the main thread
instructs the worker thread to terminate by sending it an APC, see
below.
When the ReadDirectoryChangesW call completes, its completion
routine watch_completion is automatically called. watch_completion
@ -59,9 +62,10 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
bound to a command. The default binding is w32notify-handle-event,
defined on subr.el.
After w32_read_socket or w32_console_read_socket is done processing
the notifications, it resets a flag signaling to all watch worker
threads that the notifications buffer is available for more input.
After w32_read_socket or w32_console_read_socket are done
processing the notifications, they reset a flag signaling to all
watch worker threads that the notifications buffer is available for
more input.
When the watch is removed by a call to w32notify-rm-watch, the main
thread requests that the worker thread terminates by queuing an APC
@ -72,9 +76,10 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
watch_completion function is called one last time with the
ERROR_OPERATION_ABORTED status, which causes it to clean up and set
a flag telling watch_worker to exit without issuing another
ReadDirectoryChangesW call. The main thread waits for some time
for the worker thread to exit, and if it doesn't, terminates it
forcibly. */
ReadDirectoryChangesW call. Since watch_worker is the thread
procedure of the worker thread, exiting it causes the thread to
exit. The main thread waits for some time for the worker thread to
exit, and if it doesn't, terminates it forcibly. */
#include <stddef.h>
#include <errno.h>
@ -185,9 +190,9 @@ watch_end (ULONG_PTR arg)
}
}
/* A completion routine (a.k.a. APC function) for handling events read
by ReadDirectoryChangesW. Called by the OS when the thread which
issued the asynchronous ReadDirectoryChangesW call is in the
/* A completion routine (a.k.a. "APC function") for handling events
read by ReadDirectoryChangesW. Called by the OS when the thread
which issued the asynchronous ReadDirectoryChangesW call is in the
"alertable state", i.e. waiting inside SleepEx call. */
VOID CALLBACK
watch_completion (DWORD status, DWORD bytes_ret, OVERLAPPED *io_info)