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Marc Alexander Lehmann 8 years ago
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fa259eab31
3 changed files with 43 additions and 8 deletions
  1. +1
    -0
      Changes
  2. +41
    -7
      ev.3
  3. +1
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      ev.c

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Changes View File

@ -22,6 +22,7 @@ TODO: assert on fd watcher linked list pointing to itself
- (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
- work around some kernels losing file descriptors by leaking
the kqueue descriptor in the child.
- include sys/syscall.h instead of plain syscall.h.
4.11 Sat Feb 4 19:52:39 CET 2012
- INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as


+ 41
- 7
ev.3 View File

@ -124,7 +124,7 @@
.\" ========================================================================
.\"
.IX Title "LIBEV 3"
.TH LIBEV 3 "2012-04-03" "libev-4.11" "libev - high performance full featured event loop"
.TH LIBEV 3 "2012-04-19" "libev-4.11" "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
@ -369,8 +369,8 @@ the current system, you would need to look at \f(CW\*(C`ev_embeddable_backends (
& ev_supported_backends ()\*(C'\fR, likewise for recommended ones.
.Sp
See the description of \f(CW\*(C`ev_embed\*(C'\fR watchers for more info.
.IP "ev_set_allocator (void *(*cb)(void *ptr, long size))" 4
.IX Item "ev_set_allocator (void *(*cb)(void *ptr, long size))"
.IP "ev_set_allocator (void *(*cb)(void *ptr, long size) throw ())" 4
.IX Item "ev_set_allocator (void *(*cb)(void *ptr, long size) throw ())"
Sets the allocation function to use (the prototype is similar \- the
semantics are identical to the \f(CW\*(C`realloc\*(C'\fR C89/SuS/POSIX function). It is
used to allocate and free memory (no surprises here). If it returns zero
@ -406,8 +406,8 @@ retries (example requires a standards-compliant \f(CW\*(C`realloc\*(C'\fR).
\& ...
\& ev_set_allocator (persistent_realloc);
.Ve
.IP "ev_set_syserr_cb (void (*cb)(const char *msg))" 4
.IX Item "ev_set_syserr_cb (void (*cb)(const char *msg))"
.IP "ev_set_syserr_cb (void (*cb)(const char *msg) throw ())" 4
.IX Item "ev_set_syserr_cb (void (*cb)(const char *msg) throw ())"
Set the callback function to call on a retryable system call error (such
as failed select, poll, epoll_wait). The message is a printable string
indicating the system call or subsystem causing the problem. If this
@ -1142,8 +1142,8 @@ invoke the actual watchers inside another context (another thread etc.).
.Sp
If you want to reset the callback, use \f(CW\*(C`ev_invoke_pending\*(C'\fR as new
callback.
.IP "ev_set_loop_release_cb (loop, void (*release)(\s-1EV_P\s0), void (*acquire)(\s-1EV_P\s0))" 4
.IX Item "ev_set_loop_release_cb (loop, void (*release)(EV_P), void (*acquire)(EV_P))"
.IP "ev_set_loop_release_cb (loop, void (*release)(\s-1EV_P\s0) throw (), void (*acquire)(\s-1EV_P\s0) throw ())" 4
.IX Item "ev_set_loop_release_cb (loop, void (*release)(EV_P) throw (), void (*acquire)(EV_P) throw ())"
Sometimes you want to share the same loop between multiple threads. This
can be done relatively simply by putting mutex_lock/unlock calls around
each call to a libev function.
@ -4036,6 +4036,40 @@ The libev emulation is \fInot\fR \s-1ABI\s0 compatible to libevent, you need
to use the libev header file and library.
.SH "\*(C+ SUPPORT"
.IX Header " SUPPORT"
.SS "C \s-1API\s0"
.IX Subsection "C API"
The normal C \s-1API\s0 should work fine when used from \*(C+: both ev.h and the
libev sources can be compiled as \*(C+. Therefore, code that uses the C \s-1API\s0
will work fine.
.PP
Proper exception specifications might have to be added to callbacks passed
to libev: exceptions may be thrown only from watcher callbacks, all
other callbacks (allocator, syserr, loop acquire/release and periodioc
reschedule callbacks) must not throw exceptions, and might need a \f(CW\*(C`throw
()\*(C'\fR specification. If you have code that needs to be compiled as both C
and \*(C+ you can use the \f(CW\*(C`EV_THROW\*(C'\fR macro for this:
.PP
.Vb 6
\& static void
\& fatal_error (const char *msg) EV_THROW
\& {
\& perror (msg);
\& abort ();
\& }
\&
\& ...
\& ev_set_syserr_cb (fatal_error);
.Ve
.PP
The only \s-1API\s0 functions that can currently throw exceptions are \f(CW\*(C`ev_run\*(C'\fR,
\&\f(CW\*(C`ev_inoke\*(C'\fR, \f(CW\*(C`ev_invoke_pending\*(C'\fR and \f(CW\*(C`ev_loop_destroy\*(C'\fR (the latter
because it runs cleanup watchers).
.PP
Throwing exceptions in watcher callbacks is only supported if libev itself
is compiled with a \*(C+ compiler or your C and \*(C+ environments allow
throwing exceptions through C libraries (most do).
.SS "\*(C+ \s-1API\s0"
.IX Subsection " API"
Libev comes with some simplistic wrapper classes for \*(C+ that mainly allow
you to use some convenience methods to start/stop watchers and also change
the callback model to a model using method callbacks on objects.


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ev.c View File

@ -361,7 +361,7 @@
/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
/* which makes programs even slower. might work on other unices, too. */
#if EV_USE_CLOCK_SYSCALL
# include <syscall.h>
# include <sys/syscall.h>
# ifdef SYS_clock_gettime
# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
# undef EV_USE_MONOTONIC


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