X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fpoll-loop.h;h=412bd09d40ce021530a870fe8b0ac4a25ed2ab15;hb=HEAD;hp=89c8e573e71d51e5212035dae2ac78d5634b707b;hpb=c69ee87c10818267f991236201150b1fa51ae519;p=sliver-openvswitch.git

diff --git a/lib/poll-loop.h b/lib/poll-loop.h
index 89c8e573e..412bd09d4 100644
--- a/lib/poll-loop.h
+++ b/lib/poll-loop.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * 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.
@@ -16,7 +16,7 @@
 
 /* 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(),
@@ -24,27 +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"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+
+/* 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)
 
-struct poll_waiter;
+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)
 
-/* 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);
+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);
 
-/* Cancel a file descriptor callback or event. */
-void poll_cancel(struct poll_waiter *);
+#ifdef  __cplusplus
+}
+#endif
 
 #endif /* poll-loop.h */