X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fpoll-loop.h;h=412bd09d40ce021530a870fe8b0ac4a25ed2ab15;hb=cfc50ae514f805dcd9c14589f21158185424daf6;hp=188b4f1987db8c3fa4e069a20b06c49e0c63a270;hpb=064af42167bf4fc9aaea2702d80ce08074b889c0;p=sliver-openvswitch.git

diff --git a/lib/poll-loop.h b/lib/poll-loop.h
index 188b4f198..412bd09d4 100644
--- a/lib/poll-loop.h
+++ b/lib/poll-loop.h
@@ -1,22 +1,22 @@
 /*
- * Copyright (c) 2008 Nicira Networks.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 /* High-level wrapper around the "poll" system call.
  *
- * Intended usage is for the program's main loop to go about its business
+ * The intended usage is for each thread's main loop to go about its business
  * servicing whatever events it needs to.  Then, when it runs out of immediate
  * tasks, it calls each subordinate module's "wait" function, which in turn
  * calls one (or more) of the functions poll_fd_wait(), poll_immediate_wake(),
@@ -24,32 +24,54 @@
  * occurs.  Then the main loop calls poll_block(), which blocks until one of
  * the registered events happens.
  *
- * There is also some support for autonomous subroutines that are executed by
- * poll_block() when a file descriptor becomes ready.  To prevent these
- * routines from starving if events are continuously ready, the application
- * should bound the amount of work it does between poll_block() calls. */
-
+ *
+ * Thread-safety
+ * =============
+ *
+ * The poll set is per-thread, so all functions in this module are thread-safe.
+ */
 #ifndef POLL_LOOP_H
 #define POLL_LOOP_H 1
 
 #include <poll.h>
+#include "util.h"
 
-struct poll_waiter;
+#ifdef  __cplusplus
+extern "C" {
+#endif
 
-/* Schedule events to wake up the following poll_block(). */
-struct poll_waiter *poll_fd_wait(int fd, short int events);
-void poll_timer_wait(int msec);
-void poll_immediate_wake(void);
+
+/* Schedule events to wake up the following poll_block().
+ *
+ * The poll_loop logs the 'where' argument to each function at "debug" level
+ * when an event causes a wakeup.  Each of these ways to schedule an event has
+ * a function and a macro wrapper.  The macro version automatically supplies
+ * the source code location of the caller.  The function version allows the
+ * caller to supply a location explicitly, which is useful if the caller's own
+ * caller would be more useful in log output.  See timer_wait_at() for an
+ * example. */
+void poll_fd_wait_at(int fd, HANDLE wevent, short int events, const char *where);
+#ifndef _WIN32
+#define poll_fd_wait(fd, events) poll_fd_wait_at(fd, 0, events, SOURCE_LOCATOR)
+#endif
+#define poll_fd_wait_event(fd, wevent, events)  \
+    poll_fd_wait_at(fd, wevent, events, SOURCE_LOCATOR)
+
+void poll_timer_wait_at(long long int msec, const char *where);
+#define poll_timer_wait(msec) poll_timer_wait_at(msec, SOURCE_LOCATOR)
+
+void poll_timer_wait_until_at(long long int msec, const char *where);
+#define poll_timer_wait_until(msec)             \
+    poll_timer_wait_until_at(msec, SOURCE_LOCATOR)
+
+void poll_immediate_wake_at(const char *where);
+#define poll_immediate_wake() poll_immediate_wake_at(SOURCE_LOCATOR)
 
 /* Wait until an event occurs. */
 void poll_block(void);
 
-/* Autonomous function callbacks. */
-typedef void poll_fd_func(int fd, short int revents, void *aux);
-struct poll_waiter *poll_fd_callback(int fd, short int events,
-                                     poll_fd_func *, void *aux);
-
-/* Cancel a file descriptor callback or event. */
-void poll_cancel(struct poll_waiter *);
+#ifdef  __cplusplus
+}
+#endif
 
 #endif /* poll-loop.h */