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Marc Alexander Lehmann 2014-09-05 16:00:17 +00:00
parent cf196da9d9
commit d2057c2b65
4 changed files with 35 additions and 24 deletions
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@ -11,10 +11,11 @@ TODO: store pid for each signal
TODO: document file descriptor usage per loop
TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork
TODO: embed watchers need updating when fd changes
TODO: document portbaility requirements for atomic pointer access
TODO: document portability requirements for atomic pointer access
TODO: possible cb aliasing?
TODO: document requirements for function piinters and calling conventions.
TODO: document requirements for function pointers and calling conventions.
4.18 Fri Sep 5 17:55:26 CEST 2014
- events on files were not always generated properly with the
epoll backend (testcase by Assaf Inbal).
- mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).

45
ev.3
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@ -1,4 +1,4 @@
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28)
.\"
.\" Standard preamble:
.\" ========================================================================
@ -133,7 +133,7 @@
.\" ========================================================================
.\"
.IX Title "LIBEV 3"
.TH LIBEV 3 "2013-12-27" "libev-4.15" "libev - high performance full featured event loop"
.TH LIBEV 3 "2014-09-05" "libev-4.15" "libev - high performance full featured event loop"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
@ -812,11 +812,12 @@ If you need dynamically allocated loops it is better to use \f(CW\*(C`ev_loop_ne
and \f(CW\*(C`ev_loop_destroy\*(C'\fR.
.IP "ev_loop_fork (loop)" 4
.IX Item "ev_loop_fork (loop)"
This function sets a flag that causes subsequent \f(CW\*(C`ev_run\*(C'\fR iterations to
reinitialise the kernel state for backends that have one. Despite the
name, you can call it anytime, but it makes most sense after forking, in
the child process. You \fImust\fR call it (or use \f(CW\*(C`EVFLAG_FORKCHECK\*(C'\fR) in the
child before resuming or calling \f(CW\*(C`ev_run\*(C'\fR.
This function sets a flag that causes subsequent \f(CW\*(C`ev_run\*(C'\fR iterations
to reinitialise the kernel state for backends that have one. Despite
the name, you can call it anytime you are allowed to start or stop
watchers (except inside an \f(CW\*(C`ev_prepare\*(C'\fR callback), but it makes most
sense after forking, in the child process. You \fImust\fR call it (or use
\&\f(CW\*(C`EVFLAG_FORKCHECK\*(C'\fR) in the child before resuming or calling \f(CW\*(C`ev_run\*(C'\fR.
.Sp
Again, you \fIhave\fR to call it on \fIany\fR loop that you want to re-use after
a fork, \fIeven if you do not plan to use the loop in the parent\fR. This is
@ -2163,15 +2164,17 @@ The relative timeouts are calculated relative to the \f(CW\*(C`ev_now ()\*(C'\fR
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 \fIneed\fR to base the
timeout on the current time, use something like this to adjust for this:
timeout on the current time, use something like the following to adjust
for it:
.PP
.Vb 1
\& ev_timer_set (&timer, after + ev_now () \- ev_time (), 0.);
\& ev_timer_set (&timer, after + (ev_time () \- ev_now ()), 0.);
.Ve
.PP
If the event loop is suspended for a long time, you can also force an
update of the time returned by \f(CW\*(C`ev_now ()\*(C'\fR by calling \f(CW\*(C`ev_now_update
()\*(C'\fR.
()\*(C'\fR, although that will push the event time of all outstanding events
further into the future.
.PP
\fIThe special problem of unsynchronised clocks\fR
.IX Subsection "The special problem of unsynchronised clocks"
@ -3050,13 +3053,13 @@ Prepare and check watchers are often (but not always) used in pairs:
prepare watchers get invoked before the process blocks and check watchers
afterwards.
.PP
You \fImust not\fR call \f(CW\*(C`ev_run\*(C'\fR or similar functions that enter
the current event loop from either \f(CW\*(C`ev_prepare\*(C'\fR or \f(CW\*(C`ev_check\*(C'\fR
watchers. Other loops than the current one are fine, however. The
rationale behind this is that you do not need to check for recursion in
those watchers, i.e. the sequence will always be \f(CW\*(C`ev_prepare\*(C'\fR, blocking,
\&\f(CW\*(C`ev_check\*(C'\fR so if you have one watcher of each kind they will always be
called in pairs bracketing the blocking call.
You \fImust not\fR call \f(CW\*(C`ev_run\*(C'\fR (or similar functions that enter the
current event loop) or \f(CW\*(C`ev_loop_fork\*(C'\fR from either \f(CW\*(C`ev_prepare\*(C'\fR or
\&\f(CW\*(C`ev_check\*(C'\fR watchers. Other loops than the current one are fine,
however. The rationale behind this is that you do not need to check
for recursion in those watchers, i.e. the sequence will always be
\&\f(CW\*(C`ev_prepare\*(C'\fR, blocking, \f(CW\*(C`ev_check\*(C'\fR so if you have one watcher of each
kind they will always be called in pairs bracketing the blocking call.
.PP
Their main purpose is to integrate other event mechanisms into libev and
their use is somewhat advanced. They could be used, for example, to track
@ -3360,7 +3363,7 @@ used).
\& struct ev_loop *loop_hi = ev_default_init (0);
\& struct ev_loop *loop_lo = 0;
\& ev_embed embed;
\&
\&
\& // see if there is a chance of getting one that works
\& // (remember that a flags value of 0 means autodetection)
\& loop_lo = ev_embeddable_backends () & ev_recommended_backends ()
@ -3386,7 +3389,7 @@ kqueue implementation). Store the kqueue/socket\-only event loop in
\& struct ev_loop *loop = ev_default_init (0);
\& struct ev_loop *loop_socket = 0;
\& ev_embed embed;
\&
\&
\& if (ev_supported_backends () & ~ev_recommended_backends () & EVBACKEND_KQUEUE)
\& if ((loop_socket = ev_loop_new (EVBACKEND_KQUEUE))
\& {
@ -3413,7 +3416,7 @@ of course.
\fIThe special problem of life after fork \- how is it possible?\fR
.IX Subsection "The special problem of life after fork - how is it possible?"
.PP
Most uses of \f(CW\*(C`fork()\*(C'\fR consist of forking, then some simple calls to set
Most uses of \f(CW\*(C`fork ()\*(C'\fR consist of forking, then some simple calls to set
up/change the process environment, followed by a call to \f(CW\*(C`exec()\*(C'\fR. This
sequence should be handled by libev without any problems.
.PP
@ -4247,7 +4250,7 @@ Example: use a functor object as callback.
\& ...
\& }
\& }
\&
\&
\& myfunctor f;
\&
\& ev::io w;

7
ev.c
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@ -807,11 +807,18 @@ typedef int ecb_bool;
#define ecb_decltype(x) __typeof(x)
#endif
#if _MSC_VER >= 1300
#define ecb_deprecated __declspec(deprecated)
#else
#define ecb_deprecated ecb_attribute ((__deprecated__))
#endif
#define ecb_noinline ecb_attribute ((__noinline__))
#define ecb_unused ecb_attribute ((__unused__))
#define ecb_const ecb_attribute ((__const__))
#define ecb_pure ecb_attribute ((__pure__))
/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
#if ECB_C11
#define ecb_noreturn _Noreturn
#else

2
ev.h
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@ -205,7 +205,7 @@ struct ev_loop;
/*****************************************************************************/
#define EV_VERSION_MAJOR 4
#define EV_VERSION_MINOR 15
#define EV_VERSION_MINOR 18
/* eventmask, revents, events... */
enum {