The ChangeLog file mentioned that rtsig support was removed in 1.40-beta:
Changes in 1.4.0-beta:
....
o Remove support for the rtsig method: it hasn't compiled for a while ...
With the patch against libevent 1.3e included below, rtsig.c compiles.
I only noticed that RT signals were supported because the 1.4.3 man
page had the (obsolete) note:
Support for real-time signals is due to Taral.
NOTE!
I have not yet tested it. A client of mine is looking at converting
an application from RT signals to epoll, and I wanted to benchmark the
performance of the two mechanisms (no paper I've found covers both),
and libevent looked like a good way to test the two head on, and
perhaps the ideal new API to use).
Suggestions on testing/benchmarking methods would be most welcome
(ie; programs/scripts to generate graphs found on the libevent home page)!
Phil
*** rtsig.c.orig 2007-07-30 23:41:04.000000000 -0400
--- rtsig.c 2008-05-06 21:23:00.000000000 -0400
***************
*** 176,190 ****
#include "event.h"
#include "event-internal.h"
#include "log.h"
- extern struct event_list signalqueue;
- #include <linux/unistd.h>
#ifndef __NR_gettid
#define gettid() getpid()
#else
-
#if ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)))
_syscall0(pid_t,gettid)
#endif
#endif
--- 176,193 ----
#include "event.h"
#include "event-internal.h"
#include "log.h"
#ifndef __NR_gettid
#define gettid() getpid()
#else
#if ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)))
+ #ifdef _syscall0
_syscall0(pid_t,gettid)
+ #else
+ pid_t gettid(void) {
+ return syscall(__NR_gettid);
+ }
+ #endif
#endif
#endif
***************
*** 544,550 ****
} while (0)
void *
! rtsig_init(struct event_base *)
{
struct rtsigop *op;
int sockets[2];
--- 547,553 ----
} while (0)
void *
! rtsig_init(struct event_base *base)
{
struct rtsigop *op;
int sockets[2];
***************
*** 866,873 ****
} else if (sigismember(&op->sigs, signum)) {
/* managed signals are queued */
! ev = TAILQ_FIRST(&signalqueue);
! while (ev != TAILQ_END(&signalqueue)) {
next_ev = TAILQ_NEXT(ev, ev_signal_next);
if (EVENT_SIGNAL(ev) == signum)
activate(ev, EV_SIGNAL);
--- 869,876 ----
} else if (sigismember(&op->sigs, signum)) {
/* managed signals are queued */
! ev = TAILQ_FIRST(&base->sig.signalqueue);
! while (ev != TAILQ_END(&base->sig.signalqueue)) {
next_ev = TAILQ_NEXT(ev, ev_signal_next);
if (EVENT_SIGNAL(ev) == signum)
activate(ev, EV_SIGNAL);
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