Provide OpenSSL style support for multiple threads accessing the same…

… event_base

svn:r684

ChangeLog

@@ -56,6 +56,7 @@ Changes in current version:
  o rewrite of the evbuffer code to reduce memory copies
  o Some older Solaris versions demand that _REENTRANT be defined to get strtok_r(); do so.
  o Do not free the kqop file descriptor in other processes, also allow it to be 0; from Andrei Nigmatulin
+ o Provide OpenSSL style support for multiple threads accessing the same event_base
 
 Changes in 1.4.0:
  o allow \r or \n individually to separate HTTP headers instead of the standard "\r\n"; from Charles Kerr.

Makefile.am

@@ -29,7 +29,7 @@ VERSION_INFO = 2:0:0
 bin_SCRIPTS = event_rpcgen.py
 
 EXTRA_DIST = autogen.sh event.h event-internal.h log.h evsignal.h evdns.3 \
-	evrpc.h evrpc-internal.h min_heap.h \
+	evrpc.h evrpc-internal.h min_heap.h evthread-internal.h \
 	event.3 \
 	kqueue.c epoll_sub.c epoll.c select.c poll.c signal.c \
 	evport.c devpoll.c event_rpcgen.py \

autogen.sh

@@ -4,7 +4,7 @@ SYSNAME=`uname`
 if [ "x$SYSNAME" = "xDarwin" ] ; then
   LIBTOOLIZE=glibtoolize
 fi
-aclocal && \
+aclocal -I m4 && \
 	autoheader && \
 	$LIBTOOLIZE && \
 	autoconf && \

configure.in

@@ -22,7 +22,9 @@ fi
 
 AC_ARG_ENABLE(gcc-warnings,
      AS_HELP_STRING(--enable-gcc-warnings, enable verbose warnings with GCC))
-
+AC_ARG_ENABLE(thread-support,
+     AS_HELP_STRING(--enable-thread-support, enable support for threading),
+	[], [enable_thread_support=yes])
 AC_PROG_LIBTOOL
 
 dnl   Uncomment "AC_DISABLE_SHARED" to make shared librraries not get
@@ -351,6 +353,20 @@ AC_TRY_COMPILE([],
          [Define to appropriate substitue if compiler doesnt have __func__])))
 
 
+# check if we can compile with pthreads for the unittests
+have_pthreads=no
+ACX_PTHREAD([
+	AC_DEFINE(HAVE_PTHREADS, 1,
+		[Define if we have pthreads on this system])
+	have_pthreads=yes])
+AM_CONDITIONAL(PTHREAD_REGRESS, [test "$have_pthreads" != "no"])
+
+# check if we should compile locking into the  library
+if test x$enable_thread_support = xno; then
+   AC_DEFINE(DISABLE_THREAD_SUPPORT, 1,
+	[Define if libevent should not be compiled with thread support])
+fi
+
 # Add some more warnings which we use in development but not in the
 # released versions.  (Some relevant gcc versions can't handle these.)
 if test x$enable_gcc_warnings = xyes; then

event-internal.h

@@ -67,6 +67,13 @@ struct event_base {
 	struct timeval event_tv;
 
 	struct min_heap timeheap;
+
+	/* threading support */
+	unsigned long th_owner_id;
+	unsigned long (*th_get_id)(void);
+	void (*th_lock)(int mode, int locknum);
+	int th_notify_fd[2];
+	struct event th_notify;
 };
 
 /* Internal use only: Functions that might be missing from <sys/queue.h> */