From: Pierre Habouzit <madcoder@debian.org>
Date: Fri, 11 Jan 2008 20:10:37 +0000 (+0100)
Subject: Lay off the ground of our very efficient event loop.
X-Git-Url: http://git.madism.org/?a=commitdiff_plain;h=66572f4a9c4574c9f2a2c3ef59526ac66b807b0b;p=apps%2Fmadmutt.git

Lay off the ground of our very efficient event loop.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
---

diff --git a/lib-sys/CMakeLists.txt b/lib-sys/CMakeLists.txt
index 5451b9f..178b015 100644
--- a/lib-sys/CMakeLists.txt
+++ b/lib-sys/CMakeLists.txt
@@ -1,6 +1,7 @@
 MADMUTT_SOURCES(libsyssrc libsysgen
     exit.c
     unix.c
+    evtloop.c
     mutt_signal.c
     filter.c
     mutt_tunnel.c
diff --git a/lib-sys/evtloop.c b/lib-sys/evtloop.c
new file mode 100644
index 0000000..1b5d723
--- /dev/null
+++ b/lib-sys/evtloop.c
@@ -0,0 +1,91 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *  MA 02110-1301, USA.
+ *
+ *  Copyright © 2006 Pierre Habouzit
+ */
+
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#ifndef EPOLLRDHUP
+#  include <linux/poll.h>
+#  ifdef POLLRDHUP
+#    define EPOLLRDHUP POLLRDHUP
+#  else
+#    define EPOLLRDHUP 0
+#  endif
+#endif
+#include "evtloop.h"
+#include "mutt.h"
+
+static int epollfd = -1;
+
+int el_job_release(job_t *w, el_status reason)
+{
+    w->state = EL_LLP_FINI;
+    if (w->m && w->m->finalize) {
+        w->m->finalize(w, reason);
+    }
+    if (w->fd >= 0) {
+        close(w->fd);
+    }
+    p_delete(&w);
+    return -1;
+}
+
+int el_dispatch(int timeout)
+{
+    struct epoll_event events[FD_SETSIZE];
+    int count = epoll_wait(epollfd, events, countof(events), timeout);
+
+    if (count < 0) {
+        if (errno == EAGAIN || errno == EINTR)
+            return 0;
+        mutt_error("epoll_wait");
+        mutt_exit(EXIT_FAILURE);
+    }
+
+    while (--count >= 0) {
+        job_t *w  = events[count].data.ptr;
+        int event = events[count].events;
+        int evt   = 0;
+
+        switch (w->state) {
+          case EL_LLP_INIT:
+            w->llp(w);
+            break;
+
+          case EL_LLP_READY:
+            if (event & EPOLLRDHUP) {
+                IGNORE(el_job_release(w, EL_RDHUP));
+            } else if (w->mode != w->emode) {
+                    w->m->on_event(w, EL_EVT_INOUT ^ w->emode);
+            } else {
+                if (event & EPOLLIN)
+                    evt |= EL_EVT_IN;
+                if (event & EPOLLOUT)
+                    evt |= EL_EVT_OUT;
+                w->m->on_event(w, evt);
+            }
+            break;
+
+          default:
+            IGNORE(el_job_release(w, EL_ERROR));
+            break;
+        }
+    }
+
+    return 0;
+}
diff --git a/lib-sys/evtloop.h b/lib-sys/evtloop.h
new file mode 100644
index 0000000..f08f1e7
--- /dev/null
+++ b/lib-sys/evtloop.h
@@ -0,0 +1,76 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *  MA 02110-1301, USA.
+ */
+/*
+ *  Copyright © 2006 Pierre Habouzit
+ */
+
+#ifndef MUTT_LIB_SYS_EVTLOOP_H
+#define MUTT_LIB_SYS_EVTLOOP_H
+
+#include <lib-lib/lib-lib.h>
+
+typedef enum el_state {
+    EL_LLP_INIT,
+    EL_LLP_READY,
+    EL_LLP_FINI,
+} el_state;
+
+typedef enum el_mode {
+    EL_IDLE    = 0,
+    EL_READING = 1,
+    EL_WRITING = 2,
+    EL_RDWR    = 3,
+} el_mode;
+
+typedef enum el_status {
+    EL_SUCCESS,
+    EL_ERROR,
+    EL_KILLED,
+    EL_RDHUP,
+} el_status;
+
+typedef enum el_event {
+    EL_EVT_IN      = EL_READING,
+    EL_EVT_OUT     = EL_WRITING,
+    EL_EVT_INOUT   = EL_RDWR,
+    EL_EVT_RUNNING = 4,
+    EL_EVT_WAKEUP  = 5,
+} el_event;
+
+typedef struct job_t {
+    int fd;
+
+    el_state state : 2;
+    el_mode  mode  : 2;
+    el_mode  emode : 2;
+
+    int (*llp)(struct job_t *);
+    struct machine_t *m;
+    void *ptr;
+} job_t;
+
+typedef struct machine_t {
+    const char *name;
+    __must_check__ int (*setup)(job_t *w, void *);
+    int (*on_event)(job_t *w, el_event);
+    void (*finalize)(job_t *w, el_status);
+} machine_t;
+
+__must_check__ int el_job_release(job_t *j, el_status);
+int el_dispatch(int timeout);
+
+#endif