X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/5ac4bf0bc057e29b57d7e6f8fbd42f6d075efb21..87a584a79fd6470bf0be2bf79c52fab041f5bfa8:/ev.html diff --git a/ev.html b/ev.html index 264a3b5..abaebaa 100644 --- a/ev.html +++ b/ev.html @@ -6,7 +6,7 @@ - + @@ -109,7 +109,7 @@ you linked against by calling the functions ev_version_major and ev_version_minor. If you want, you can compare against the global symbols EV_VERSION_MAJOR and EV_VERSION_MINOR, which specify the version of the library your program was compiled against.

Usually, its a good idea to terminate if the major versions mismatch, +

Usually, it's a good idea to terminate if the major versions mismatch, as this indicates an incompatible change. Minor versions are usually compatible to older versions, so a larger minor version alone is usually not a problem.

@@ -148,7 +148,7 @@ in your main thread (or in a separate thrad) and for each thread you create, you also create another event loop. Libev itself does no locking whatsoever, so if you mix calls to the same event loop in different threads, make sure you lock (this is usually a bad idea, though, even if -done correctly, because its hideous and inefficient).

+done correctly, because it's hideous and inefficient).

struct ev_loop *ev_default_loop (unsigned int flags)

@@ -165,7 +165,7 @@ backends to use, and is usually specified as 0 (or EVFLAG_AUTO).

EVFLAG_AUTO

The default flags value. Use this if you have no clue (its the right +

The default flags value. Use this if you have no clue (it's the right thing, believe me).

EVFLAG_NOENV

EVMETHOD_SELECT portable select backend

EVMETHOD_POLL poll backend (everywhere except windows)

EVMETHOD_EPOLL linux only

EVMETHOD_KQUEUE some bsds only

EVMETHOD_DEVPOLL solaris 8 only

EVMETHOD_PORT solaris 10 only

EVMETHOD_SELECT (portable select backend)

EVMETHOD_POLL (poll backend, available everywhere except on windows)

EVMETHOD_EPOLL (linux only)

EVMETHOD_KQUEUE (some bsds only)

EVMETHOD_DEVPOLL (solaris 8 only)

EVMETHOD_PORT (solaris 10 only)

If one or more of these are ored into the flags value, then only these backends will be tried (in the reverse order as given here). If one are @@ -202,7 +202,7 @@ undefined behaviour (or a failed assertion if assertions are enabled).

Destroys the default loop again (frees all memory and kernel state etc.). This stops all registered event watchers (by not touching them in -any way whatsoever, although you cnanot rely on this :).

+any way whatsoever, although you cannot rely on this :).

ev_loop_destroy (loop)

@@ -218,7 +218,7 @@ again makes little sense).

You must call this function after forking if and only if you want to use the event library in both processes. If you just fork+exec, you don't have to call it.

The function itself is quite fast and its usually not a problem to call +

The function itself is quite fast and it's usually not a problem to call it just in case after a fork. To make this easy, the function will fit in quite nicely into a call to pthread_atfork:

    pthread_atfork (0, 0, ev_default_fork);
@@ -236,7 +236,7 @@ after fork, and how you do this is entirely your own problem.
 		Returns one of the EVMETHOD_* flags indicating the event backend in
 use.

ev_tstamp = ev_now (loop)

ev_tstamp ev_now (loop)

Returns the current "event loop time", which is the time the event loop got events and started processing them. This timestamp does not change @@ -253,33 +253,35 @@ events.

no event watchers are active anymore or ev_unloop was called.

A flags value of EVLOOP_NONBLOCK will look for new events, will handle those events and any outstanding ones, but will not block your process in -case there are no events.

+case there are no events and will return after one iteration of the loop.

A flags value of EVLOOP_ONESHOT will look for new events (waiting if neccessary) and will handle those and any outstanding ones. It will block -your process until at least one new event arrives.

+your process until at least one new event arrives, and will return after +one iteration of the loop.

This flags value could be used to implement alternative looping constructs, but the prepare and check watchers provide a better and more generic mechanism.

ev_unloop (loop, how)

Can be used to make a call to ev_loop return early. The how argument -must be either EVUNLOOP_ONCE, which will make the innermost ev_loop -call return, or EVUNLOOP_ALL, which will make all nested ev_loop -calls return.

Can be used to make a call to ev_loop return early (but only after it +has processed all outstanding events). The how argument must be either +EVUNLOOP_ONCE, which will make the innermost ev_loop call return, or +EVUNLOOP_ALL, which will make all nested ev_loop calls return.

ev_ref (loop)

ev_unref (loop)

Ref/unref can be used to add or remove a refcount on the event loop: Every -watcher keeps one reference. If you have a long-runing watcher you never -unregister that should not keep ev_loop from running, ev_unref() after -starting, and ev_ref() before stopping it. Libev itself uses this for -example for its internal signal pipe: It is not visible to you as a user -and should not keep ev_loop from exiting if the work is done. It is -also an excellent way to do this for generic recurring timers or from -within third-party libraries. Just remember to unref after start and ref -before stop.

Ref/unref can be used to add or remove a reference count on the event +loop: Every watcher keeps one reference, and as long as the reference +count is nonzero, ev_loop will not return on its own. If you have +a watcher you never unregister that should not keep ev_loop from +returning, ev_unref() after starting, and ev_ref() before stopping it. For +example, libev itself uses this for its internal signal pipe: It is not +visible to the libev user and should not keep ev_loop from exiting if +no event watchers registered by it are active. It is also an excellent +way to do this for generic recurring timers or from within third-party +libraries. Just remember to unref after start and ref before stop.

@@ -464,6 +466,14 @@ times out after an hour and youreset your system clock to last years time, it will still time out after (roughly) and hour. "Roughly" because detecting time jumps is hard, and soem inaccuracies are unavoidable (the monotonic clock option helps a lot here).

The relative timeouts are calculated relative to the ev_now () +time. This is usually the right thing as this timestamp refers to the time +of the event triggering whatever timeout you are modifying/starting. If +you suspect event processing to be delayed and you *need* to base the timeout +ion the current time, use something like this to adjust for this:

   ev_timer_set (&timer, after + ev_now () - ev_time (), 0.);
+
+

ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat)
ev_timer_set (ev_timer *, ev_tstamp after, ev_tstamp repeat)