/*
- * Copyright (c) 2008, 2009, 2010, 2011 Nicira, Inc.
+ * 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.
/* 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(),
* and poll_timer_wait() to register to be awakened when the appropriate event
* occurs. Then the main loop calls poll_block(), which blocks until one of
- * the registered events happens. */
-
+ * the registered events happens.
+ *
+ *
+ * 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
extern "C" {
#endif
-struct poll_waiter;
/* 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. Ordinarily, it is automatically filled in
- * with the location in the source of the call, and caller should therefore
- * omit it. But, if the function you are implementing is very generic, so that
- * its location in the source would not be very helpful for debugging, you can
- * avoid the macro expansion and pass a different argument, e.g.:
- * (poll_fd_wait)(fd, events, where);
- * See timer_wait() for an example.
- */
-struct poll_waiter *poll_fd_wait(int fd, short int events, const char *where);
-#define poll_fd_wait(fd, events) poll_fd_wait(fd, events, SOURCE_LOCATOR)
+ * 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, short int events, const char *where);
+#define poll_fd_wait(fd, events) poll_fd_wait_at(fd, events, SOURCE_LOCATOR)
-void poll_timer_wait(long long int msec, const char *where);
-#define poll_timer_wait(msec) poll_timer_wait(msec, 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(long long int msec, const char *where);
-#define poll_timer_wait_until(msec) poll_timer_wait_until(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(const char *where);
-#define poll_immediate_wake() poll_immediate_wake(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);
-/* Cancel a file descriptor callback or event. */
-void poll_cancel(struct poll_waiter *);
-
#ifdef __cplusplus
}
#endif