path: root/mail/mail-mt.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#include <config.h>

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>

#include <glib.h>

#include <gtk/gtk.h>
#include <libgnome/gnome-i18n.h>

#include <libedataserver/e-msgport.h>
#include <libedataserver/e-data-server-util.h>

#include <camel/camel-url.h>
#include <camel/camel-operation.h>

#include "misc/e-gui-utils.h"
#include "e-util/e-error.h"
#include "e-util/e-icon-factory.h"

#include "e-activity-handler.h"

#include "mail-config.h"
#include "mail-component.h"
#include "mail-session.h"
#include "mail-mt.h"

/*#define MALLOC_CHECK*/
#define LOG_OPS
#define LOG_LOCKS
#define d(x) 

static void set_stop(int sensitive);
static void mail_operation_status(struct _CamelOperation *op, const char *what, int pc, void *data);

#ifdef LOG_LOCKS
#define MAIL_MT_LOCK(x) (log_locks?fprintf(log, "%" G_GINT64_MODIFIER "x: lock " # x "\n", e_util_pthread_id(pthread_self())):0, pthread_mutex_lock(&x))
#define MAIL_MT_UNLOCK(x) (log_locks?fprintf(log, "%" G_GINT64_MODIFIER "x: unlock " # x "\n", e_util_pthread_id(pthread_self())): 0, pthread_mutex_unlock(&x))
#else
#define MAIL_MT_LOCK(x) pthread_mutex_lock(&x)
#define MAIL_MT_UNLOCK(x) pthread_mutex_unlock(&x)
#endif

/* background operation status stuff */
struct _mail_msg_priv {
    int activity_state; /* sigh sigh sigh, we need to keep track of the state external to the
                   pointer itself for locking/race conditions */
    int activity_id;
};

static GdkPixbuf *progress_icon = NULL;

/* mail_msg stuff */
#ifdef LOG_OPS
static FILE *log;
static int log_ops, log_locks, log_init;
#endif

static unsigned int mail_msg_seq; /* sequence number of each message */
static GHashTable *mail_msg_active_table; /* table of active messages, must hold mail_msg_lock to access */
static pthread_mutex_t mail_msg_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t mail_msg_cond = PTHREAD_COND_INITIALIZER;

pthread_t mail_gui_thread;

MailAsyncEvent *mail_async_event;

static void mail_msg_destroy(EThread *e, EMsg *msg, void *data);

void *mail_msg_new(mail_msg_op_t *ops, EMsgPort *reply_port, size_t size)
{
    struct _mail_msg *msg;

    MAIL_MT_LOCK(mail_msg_lock);

#if defined(LOG_OPS) || defined(LOG_LOCKS)
    if (!log_init) {
        time_t now = time(0);

        log_init = TRUE;
        log_ops = getenv("EVOLUTION_MAIL_LOG_OPS") != NULL;
        log_locks = getenv("EVOLUTION_MAIL_LOG_LOCKS") != NULL;
        if (log_ops || log_locks) {
            log = fopen("evolution-mail-ops.log", "w+");
            if (log) {
                setvbuf(log, NULL, _IOLBF, 0);
                fprintf(log, "Started evolution-mail: %s\n", ctime(&now));
                g_warning("Logging mail operations to evolution-mail-ops.log");

                if (log_ops)
                    fprintf(log, "Logging async operations\n");

                if (log_locks) {
                    fprintf(log, "Logging lock operations, mail_gui_thread = %" G_GINT64_MODIFIER "x\n\n", e_util_pthread_id(mail_gui_thread));
                    fprintf(log, "%" G_GINT64_MODIFIER "x: lock mail_msg_lock\n", e_util_pthread_id(pthread_self()));
                }
            } else {
                g_warning ("Could not open log file: %s", strerror(errno));
                log_ops = log_locks = FALSE;
            }
        }
    }
#endif
    msg = g_malloc0(size);
    msg->ops = ops;
    msg->seq = mail_msg_seq++;
    msg->msg.reply_port = reply_port;
    msg->cancel = camel_operation_new(mail_operation_status, GINT_TO_POINTER(msg->seq));
    camel_exception_init(&msg->ex);
    msg->priv = g_malloc0(sizeof(*msg->priv));

    g_hash_table_insert(mail_msg_active_table, GINT_TO_POINTER(msg->seq), msg);

    d(printf("New message %p\n", msg));

#ifdef LOG_OPS
    if (log_ops)
        fprintf(log, "%p: New\n", msg);
#endif
    MAIL_MT_UNLOCK(mail_msg_lock);

    return msg;
}


static void end_event_callback (CamelObject *o, void *event_data, void *data)
{
    EActivityHandler *activity_handler = mail_component_peek_activity_handler (mail_component_peek ());
    guint activity_id = GPOINTER_TO_INT (event_data);

    e_activity_handler_operation_finished (activity_handler, activity_id);
}


#ifdef MALLOC_CHECK
#include <mcheck.h>

static void
checkmem(void *p)
{
    if (p) {
        int status = mprobe(p);

        switch (status) {
        case MCHECK_HEAD:
            printf("Memory underrun at %p\n", p);
            abort();
        case MCHECK_TAIL:
            printf("Memory overrun at %p\n", p);
            abort();
        case MCHECK_FREE:
            printf("Double free %p\n", p);
            abort();
        }
    }
}
#endif

void mail_msg_free(void *msg)
{
    struct _mail_msg *m = msg;
    int activity_id;

#ifdef MALLOC_CHECK
    checkmem(m);
    checkmem(m->cancel);
    checkmem(m->priv);
#endif
    d(printf("Free message %p\n", msg));

    if (m->ops->destroy_msg)
        m->ops->destroy_msg(m);

    MAIL_MT_LOCK(mail_msg_lock);

#ifdef LOG_OPS
    if (log_ops)
        fprintf(log, "%p: Free  (exception `%s')\n", msg,
            camel_exception_get_description(&m->ex)?camel_exception_get_description(&m->ex):"None");
#endif
    g_hash_table_remove(mail_msg_active_table, GINT_TO_POINTER(m->seq));
    pthread_cond_broadcast(&mail_msg_cond);

    /* We need to make sure we dont lose a reference here YUCK YUCK */
    /* This is tightly integrated with the code in do_op_status,
       as it closely relates to the CamelOperation setup in msg_new() above */
    if (m->priv->activity_state == 1) {
        m->priv->activity_state = 3; /* tell the other thread
                          * to free it itself (yuck yuck) */
        MAIL_MT_UNLOCK(mail_msg_lock);
        return;
    } else {
        activity_id = m->priv->activity_id;
    }

    MAIL_MT_UNLOCK(mail_msg_lock);

    if (m->cancel) {
        camel_operation_mute(m->cancel);
        camel_operation_unref(m->cancel);
    }

    camel_exception_clear(&m->ex);
    /*g_free(m->priv->what);*/
    g_free(m->priv);
    g_free(m);

    if (activity_id != 0)
        mail_async_event_emit(mail_async_event, MAIL_ASYNC_GUI, (MailAsyncFunc) end_event_callback,
                      NULL, GINT_TO_POINTER (activity_id), NULL);
}

/* hash table of ops->dialogue of active errors */
static GHashTable *active_errors = NULL;

static void error_destroy(GtkObject *o, void *data)
{
    g_hash_table_remove(active_errors, data);
}

static void error_response(GtkObject *o, int button, void *data)
{
    gtk_widget_destroy((GtkWidget *)o);
}

void mail_msg_check_error(void *msg)
{
    struct _mail_msg *m = msg;
    char *what;
    GtkDialog *gd;
    
#ifdef MALLOC_CHECK
    checkmem(m);
    checkmem(m->cancel);
    checkmem(m->priv);
#endif
    
    /* don't report any errors if we are not in interactive mode */
    if (!mail_session_get_interactive ())
        return;
    
    if (!camel_exception_is_set(&m->ex)
        || m->ex.id == CAMEL_EXCEPTION_USER_CANCEL
        || m->ex.id == CAMEL_EXCEPTION_FOLDER_INVALID_UID)
        return;

    if (active_errors == NULL)
        active_errors = g_hash_table_new(NULL, NULL);

    /* check to see if we have dialogue already running for this operation */
    /* we key on the operation pointer, which is at least accurate enough
       for the operation type, although it could be on a different object. */
    if (g_hash_table_lookup(active_errors, m->ops)) {
        g_warning("Error occurred while existing dialogue active:\n%s", camel_exception_get_description(&m->ex));
        return;
    }

    if (m->ops->describe_msg
        && (what = m->ops->describe_msg(m, FALSE))) {
        gd = (GtkDialog *)e_error_new(NULL, "mail:async-error", what, camel_exception_get_description(&m->ex), NULL);
        g_free(what);
    } else
        gd = (GtkDialog *)e_error_new(NULL, "mail:async-error-nodescribe", camel_exception_get_description(&m->ex), NULL);

    g_hash_table_insert(active_errors, m->ops, gd);
    g_signal_connect(gd, "response", G_CALLBACK(error_response), m->ops);
    g_signal_connect(gd, "destroy", G_CALLBACK(error_destroy), m->ops);
    gtk_widget_show((GtkWidget *)gd);
}

void mail_msg_cancel(unsigned int msgid)
{
    struct _mail_msg *m;

    MAIL_MT_LOCK(mail_msg_lock);
    m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));

    if (m && m->cancel)
        camel_operation_cancel(m->cancel);

    MAIL_MT_UNLOCK(mail_msg_lock);
}


/* waits for a message to be finished processing (freed)
   the messageid is from struct _mail_msg->seq */
void mail_msg_wait(unsigned int msgid)
{
    struct _mail_msg *m;
    int ismain = pthread_equal(pthread_self(), mail_gui_thread);

    if (ismain) {
        MAIL_MT_LOCK(mail_msg_lock);
        m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
        while (m) {
            MAIL_MT_UNLOCK(mail_msg_lock);
            gtk_main_iteration();
            MAIL_MT_LOCK(mail_msg_lock);
            m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
        }
        MAIL_MT_UNLOCK(mail_msg_lock);
    } else {
        MAIL_MT_LOCK(mail_msg_lock);
        m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
        while (m) {
            pthread_cond_wait(&mail_msg_cond, &mail_msg_lock);
            m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
        }
        MAIL_MT_UNLOCK(mail_msg_lock);
    }
}

int mail_msg_active(unsigned int msgid)
{
    int active;

    MAIL_MT_LOCK(mail_msg_lock);
    if (msgid == (unsigned int)-1) 
        active = g_hash_table_size(mail_msg_active_table) > 0;
    else
        active = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid)) != NULL;
    MAIL_MT_UNLOCK(mail_msg_lock);

    return active;
}

void mail_msg_wait_all(void)
{
    int ismain = pthread_equal(pthread_self(), mail_gui_thread);

    if (ismain) {
        MAIL_MT_LOCK(mail_msg_lock);
        while (g_hash_table_size(mail_msg_active_table) > 0) {
            MAIL_MT_UNLOCK(mail_msg_lock);
            gtk_main_iteration();
            MAIL_MT_LOCK(mail_msg_lock);
        }
        MAIL_MT_UNLOCK(mail_msg_lock);
    } else {
        MAIL_MT_LOCK(mail_msg_lock);
        while (g_hash_table_size(mail_msg_active_table) > 0) {
            pthread_cond_wait(&mail_msg_cond, &mail_msg_lock);
        }
        MAIL_MT_UNLOCK(mail_msg_lock);
    }
}

/* **************************************** */
struct _cancel_hook_data {
    struct _cancel_hook_data *next;
    struct _cancel_hook_data *prev;

    GDestroyNotify func;
    void *data;
};

static EDList cancel_hook_list = E_DLIST_INITIALISER(cancel_hook_list);

void *mail_cancel_hook_add(GDestroyNotify func, void *data)
{
    struct _cancel_hook_data *d;

    d = g_malloc0(sizeof(*d));
    d->func = func;
    d->data = data;

    MAIL_MT_LOCK(mail_msg_lock);
    e_dlist_addtail(&cancel_hook_list, (EDListNode *)d);
    MAIL_MT_UNLOCK(mail_msg_lock);

    return (void *)d;
}

void mail_cancel_hook_remove(void *handle)
{
    struct _cancel_hook_data *d = handle;

    MAIL_MT_LOCK(mail_msg_lock);
    e_dlist_remove((EDListNode *)d);
    MAIL_MT_UNLOCK(mail_msg_lock);
    g_free(d);
}

void mail_cancel_all(void)
{
    struct _cancel_hook_data *d, *n;

    camel_operation_cancel(NULL);

    /* I can ssee a deadlock coming on ... */
    MAIL_MT_LOCK(mail_msg_lock);
    d = (struct _cancel_hook_data *)cancel_hook_list.head;
    n = d->next;
    while (n) {
        d->func(d->data);
        d = n;
        n = n->next;
    }
    MAIL_MT_UNLOCK(mail_msg_lock);
}

EMsgPort        *mail_gui_port;
static GIOChannel   *mail_gui_channel;
static guint         mail_gui_watch;

/* TODO: Merge these, gui_port2 doesn't do any mail_msg processing on the request (replies, forwards, frees) */
EMsgPort        *mail_gui_port2;
static GIOChannel   *mail_gui_channel2;
static guint         mail_gui_watch2;

EMsgPort        *mail_gui_reply_port;
static GIOChannel   *mail_gui_reply_channel;

/* a couple of global threads available */
EThread *mail_thread_queued;    /* for operations that can (or should) be queued */
EThread *mail_thread_queued_slow;   /* for operations that can (or should) be queued, but take a long time */
EThread *mail_thread_new;   /* for operations that should run in a new thread each time */

static gboolean
mail_msgport_replied(GIOChannel *source, GIOCondition cond, void *d)
{
    EMsgPort *port = (EMsgPort *)d;
    mail_msg_t *m;

    while (( m = (mail_msg_t *)e_msgport_get(port))) {

#ifdef MALLOC_CHECK
        checkmem(m);
        checkmem(m->cancel);
        checkmem(m->priv);
#endif

#ifdef LOG_OPS
        if (log_ops)
            fprintf(log, "%p: Replied to GUI thread (exception `%s'\n", m,
                camel_exception_get_description(&m->ex)?camel_exception_get_description(&m->ex):"None");
#endif

        if (m->ops->reply_msg)
            m->ops->reply_msg(m);
        mail_msg_check_error(m);
        mail_msg_free(m);
    }

    return TRUE;
}

static gboolean
mail_msgport_received(GIOChannel *source, GIOCondition cond, void *d)
{
    EMsgPort *port = (EMsgPort *)d;
    mail_msg_t *m;

    while (( m = (mail_msg_t *)e_msgport_get(port))) {
#ifdef MALLOC_CHECK
        checkmem(m);
        checkmem(m->cancel);
        checkmem(m->priv);
#endif

#ifdef LOG_OPS
        if (log_ops)
            fprintf(log, "%p: Received at GUI thread\n", m);
#endif

        if (m->ops->receive_msg)
            m->ops->receive_msg(m);
        if (m->msg.reply_port)
            e_msgport_reply((EMsg *)m);
        else {
            if (m->ops->reply_msg)
                m->ops->reply_msg(m);
            mail_msg_free(m);
        }
    }

    return TRUE;
}

/* Test code, lighterwight, more configurable calls */
static gboolean
mail_msgport_received2(GIOChannel *source, GIOCondition cond, void *d)
{
    EMsgPort *port = (EMsgPort *)d;
    mail_msg_t *m;

    while (( m = (mail_msg_t *)e_msgport_get(port))) {
#ifdef LOG_OPS
        if (log_ops)
            fprintf(log, "%p: Received at GUI2 thread\n", m);
#endif

        if (m->ops->receive_msg)
            m->ops->receive_msg(m);
        else
            mail_msg_free(m);
    }

    return TRUE;
}


static void
mail_msg_destroy(EThread *e, EMsg *msg, void *data)
{
    mail_msg_t *m = (mail_msg_t *)msg;

#ifdef MALLOC_CHECK
    checkmem(m);
    checkmem(m->cancel);
    checkmem(m->priv);
#endif  

    mail_msg_free(m);
}

static void
mail_msg_received(EThread *e, EMsg *msg, void *data)
{
    mail_msg_t *m = (mail_msg_t *)msg;

#ifdef MALLOC_CHECK
    checkmem(m);
    checkmem(m->cancel);
    checkmem(m->priv);
#endif

    if (m->ops->describe_msg) {
        char *text = m->ops->describe_msg(m, FALSE);

#ifdef LOG_OPS
        if (log_ops)
            fprintf(log, "%p: Received at thread %" G_GINT64_MODIFIER "x: '%s'\n", m, e_util_pthread_id(pthread_self()), text);
#endif

        d(printf("message received at thread\n"));
        camel_operation_register(m->cancel);
        camel_operation_start(m->cancel, "%s", text);
        g_free(text);
    }
#ifdef LOG_OPS
    else
        if (log_ops)
            fprintf(log, "%p: Received at thread %" G_GINT64_MODIFIER "x\n", m, e_util_pthread_id(pthread_self()));
#endif

    if (m->ops->receive_msg) {
        mail_enable_stop();
        m->ops->receive_msg(m);
        mail_disable_stop();
    }

    if (m->ops->describe_msg) {
        camel_operation_end(m->cancel);
        camel_operation_unregister(m->cancel);
        MAIL_MT_LOCK(mail_msg_lock);
        camel_operation_unref(m->cancel);
        m->cancel = NULL;
        MAIL_MT_UNLOCK(mail_msg_lock);
    }
}

void mail_msg_cleanup(void)
{
    mail_msg_wait_all();

    e_thread_destroy(mail_thread_queued_slow);
    e_thread_destroy(mail_thread_queued);
    e_thread_destroy(mail_thread_new);

    g_io_channel_unref(mail_gui_channel);
    g_io_channel_unref(mail_gui_reply_channel);

    e_msgport_destroy(mail_gui_port);
    e_msgport_destroy(mail_gui_reply_port);
}

static guint
em_channel_setup(EMsgPort **port, GIOChannel **channel, GIOFunc func)
{
    GSource *source;
    guint id;

    *port = e_msgport_new();
#ifndef G_OS_WIN32
    *channel = g_io_channel_unix_new(e_msgport_fd(*port));
#else
    *channel = g_io_channel_win32_new_socket(e_msgport_fd(*port));
#endif
    source = g_io_create_watch(*channel, G_IO_IN);
    g_source_set_callback(source, (GSourceFunc)func, *port, NULL);
    g_source_set_can_recurse(source, FALSE);
    id = g_source_attach(source, NULL);
    g_source_unref(source);

    return id;
}

void mail_msg_init(void)
{
    em_channel_setup(&mail_gui_reply_port, &mail_gui_reply_channel, mail_msgport_replied);
    mail_gui_watch = em_channel_setup(&mail_gui_port, &mail_gui_channel, mail_msgport_received);
    mail_gui_watch2 = em_channel_setup(&mail_gui_port2, &mail_gui_channel2, mail_msgport_received2);

    mail_thread_queued = e_thread_new(E_THREAD_QUEUE);
    e_thread_set_msg_destroy(mail_thread_queued, mail_msg_destroy, 0);
    e_thread_set_msg_received(mail_thread_queued, mail_msg_received, 0);
    e_thread_set_reply_port(mail_thread_queued, mail_gui_reply_port);

    mail_thread_queued_slow = e_thread_new(E_THREAD_QUEUE);
    e_thread_set_msg_destroy(mail_thread_queued_slow, mail_msg_destroy, 0);
    e_thread_set_msg_received(mail_thread_queued_slow, mail_msg_received, 0);
    e_thread_set_reply_port(mail_thread_queued_slow, mail_gui_reply_port);

    mail_thread_new = e_thread_new(E_THREAD_NEW);
    e_thread_set_msg_destroy(mail_thread_new, mail_msg_destroy, 0);
    e_thread_set_msg_received(mail_thread_new, mail_msg_received, 0);
    e_thread_set_reply_port(mail_thread_new, mail_gui_reply_port);
    e_thread_set_queue_limit(mail_thread_new, 10);

    mail_msg_active_table = g_hash_table_new(NULL, NULL);
    mail_gui_thread = pthread_self();

    mail_async_event = mail_async_event_new();
}

/* ********************************************************************** */

/* locks */
static pthread_mutex_t status_lock = PTHREAD_MUTEX_INITIALIZER;

/* ********************************************************************** */

struct _proxy_msg {
    struct _mail_msg msg;
    MailAsyncEvent *ea;
    mail_async_event_t type;

    pthread_t thread;
    int have_thread;

    MailAsyncFunc func;
    void *o;
    void *event_data;
    void *data;
};

static void
do_async_event(struct _mail_msg *mm)
{
    struct _proxy_msg *m = (struct _proxy_msg *)mm;

    m->thread = pthread_self();
    m->have_thread = TRUE;
    m->func(m->o, m->event_data, m->data);
    m->have_thread = FALSE;

    g_mutex_lock(m->ea->lock);
    m->ea->tasks = g_slist_remove(m->ea->tasks, m);
    g_mutex_unlock(m->ea->lock);
}

static int
idle_async_event(void *mm)
{
    do_async_event(mm);
    mail_msg_free(mm);

    return FALSE;
}

static struct _mail_msg_op async_event_op = {
    NULL,
    do_async_event,
    NULL,
    NULL,
};

MailAsyncEvent *mail_async_event_new(void)
{
    MailAsyncEvent *ea;

    ea = g_malloc0(sizeof(*ea));
    ea->lock = g_mutex_new();

    return ea;
}

int mail_async_event_emit(MailAsyncEvent *ea, mail_async_event_t type, MailAsyncFunc func, void *o, void *event_data, void *data)
{
    struct _proxy_msg *m;
    int id;
    int ismain = pthread_equal(pthread_self(), mail_gui_thread);

    /* we dont have a reply port for this, we dont care when/if it gets executed, just queue it */
    m = mail_msg_new(&async_event_op, NULL, sizeof(*m));
    m->func = func;
    m->o = o;
    m->event_data = event_data;
    m->data = data;
    m->ea = ea;
    m->type = type;
    m->have_thread = FALSE;
    
    id = m->msg.seq;
    g_mutex_lock(ea->lock);
    ea->tasks = g_slist_prepend(ea->tasks, m);
    g_mutex_unlock(ea->lock);

    /* We use an idle function instead of our own message port only because the
       gui message ports's notification buffer might overflow and deadlock us */
    if (type == MAIL_ASYNC_GUI) {
        if (ismain)
            g_idle_add(idle_async_event, m);
        else
            e_msgport_put(mail_gui_port, (EMsg *)m);
    } else
        e_thread_put(mail_thread_queued, (EMsg *)m);

    return id;
}

int mail_async_event_destroy(MailAsyncEvent *ea)
{
    int id;
    pthread_t thread = pthread_self();
    struct _proxy_msg *m;

    g_mutex_lock(ea->lock);
    while (ea->tasks) {
        m = ea->tasks->data;
        id = m->msg.seq;
        if (m->have_thread && pthread_equal(m->thread, thread)) {
            g_warning("Destroying async event from inside an event, returning EDEADLK");
            g_mutex_unlock(ea->lock);
            errno = EDEADLK;
            return -1;
        }
        g_mutex_unlock(ea->lock);
        mail_msg_wait(id);
        g_mutex_lock(ea->lock);
    }
    g_mutex_unlock(ea->lock);

    g_mutex_free(ea->lock);
    g_free(ea);

    return 0;
}

/* ********************************************************************** */

struct _call_msg {
    struct _mail_msg msg;
    mail_call_t type;
    MailMainFunc func;
    void *ret;
    va_list ap;
};

static void
do_call(struct _mail_msg *mm)
{
    struct _call_msg *m = (struct _call_msg *)mm;
    void *p1, *p2, *p3, *p4, *p5;
    int i1;
    va_list ap;

    G_VA_COPY(ap, m->ap);

    switch(m->type) {
    case MAIL_CALL_p_p:
        p1 = va_arg(ap, void *);
        m->ret = m->func(p1);
        break;
    case MAIL_CALL_p_pp:
        p1 = va_arg(ap, void *);
        p2 = va_arg(ap, void *);
        m->ret = m->func(p1, p2);
        break;
    case MAIL_CALL_p_ppp:
        p1 = va_arg(ap, void *);
        p2 = va_arg(ap, void *);
        p3 = va_arg(ap, void *);
        m->ret = m->func(p1, p2, p3);
        break;
    case MAIL_CALL_p_pppp:
        p1 = va_arg(ap, void *);
        p2 = va_arg(ap, void *);
        p3 = va_arg(ap, void *);
        p4 = va_arg(ap, void *);
        m->ret = m->func(p1, p2, p3, p4);
        break;
    case MAIL_CALL_p_ppppp:
        p1 = va_arg(ap, void *);
        p2 = va_arg(ap, void *);
        p3 = va_arg(ap, void *);
        p4 = va_arg(ap, void *);
        p5 = va_arg(ap, void *);
        m->ret = m->func(p1, p2, p3, p4, p5);
        break;
    case MAIL_CALL_p_ppippp:
        p1 = va_arg(ap, void *);
        p2 = va_arg(ap, void *);
        i1 = va_arg(ap, int);
        p3 = va_arg(ap, void *);
        p4 = va_arg(ap, void *);
        p5 = va_arg(ap, void *);
        m->ret = m->func(p1, p2, i1, p3, p4, p5);
        break;
    }
}

static struct _mail_msg_op mail_call_op = {
    NULL,
    do_call,
    NULL,
    NULL,
};

void *mail_call_main(mail_call_t type, MailMainFunc func, ...)
{
    struct _call_msg *m;
    void *ret;
    va_list ap;
    EMsgPort *reply = NULL;
    int ismain = pthread_equal(pthread_self(), mail_gui_thread);

    va_start(ap, func);

    if (!ismain)
        reply = e_msgport_new();

    m = mail_msg_new(&mail_call_op, reply, sizeof(*m));
    m->type = type;
    m->func = func;
    G_VA_COPY(m->ap, ap);

    if (!ismain) {
        e_msgport_put(mail_gui_port, (EMsg *)m);
        e_msgport_wait(reply);
        e_msgport_destroy(reply);
    } else {
        do_call(&m->msg);
    }

    va_end(ap);

    ret = m->ret;
    mail_msg_free(m);
    
    return ret;
}

/* ********************************************************************** */
/* locked via status_lock */
static int busy_state;

static void do_set_busy(struct _mail_msg *mm)
{
    set_stop(busy_state > 0);
}

static struct _mail_msg_op set_busy_op = {
    NULL,
    do_set_busy,
    NULL,
    NULL,
};

void mail_enable_stop(void)
{
    struct _mail_msg *m;

    MAIL_MT_LOCK(status_lock);
    busy_state++;
    if (busy_state == 1) {
        m = mail_msg_new(&set_busy_op, NULL, sizeof(*m));
        e_msgport_put(mail_gui_port, (EMsg *)m);
    }
    MAIL_MT_UNLOCK(status_lock);
}

void mail_disable_stop(void)
{
    struct _mail_msg *m;

    MAIL_MT_LOCK(status_lock);
    busy_state--;
    if (busy_state == 0) {
        m = mail_msg_new(&set_busy_op, NULL, sizeof(*m));
        e_msgport_put(mail_gui_port, (EMsg *)m);
    }
    MAIL_MT_UNLOCK(status_lock);
}

/* ******************************************************************************** */

struct _op_status_msg {
    struct _mail_msg msg;

    struct _CamelOperation *op;
    char *what;
    int pc;
    void *data;
};

static void do_op_status(struct _mail_msg *mm)
{
    EActivityHandler *activity_handler = mail_component_peek_activity_handler (mail_component_peek ());
    struct _op_status_msg *m = (struct _op_status_msg *)mm;
    struct _mail_msg *msg;
    struct _mail_msg_priv *data;
    char *out, *p, *o, c;
    int pc;
    
    g_assert (pthread_equal(mail_gui_thread, pthread_self ()));
    
    MAIL_MT_LOCK (mail_msg_lock);
    
    msg = g_hash_table_lookup (mail_msg_active_table, m->data);

    if (msg == NULL) {
        MAIL_MT_UNLOCK (mail_msg_lock);
        return;
    }
    
    data = msg->priv;
    
    out = alloca (strlen (m->what) * 2 + 1);
    o = out;
    p = m->what;
    while ((c = *p++)) {
        if (c == '%')
            *o++ = '%';
        *o++ = c;
    }
    *o = 0;
    
    pc = m->pc;
    
    if (data->activity_id == 0) {
        char *what;
        
        /* its being created/removed?  well leave it be */
        if (data->activity_state == 1 || data->activity_state == 3) {
            MAIL_MT_UNLOCK (mail_msg_lock);
            return;
        } else {
            data->activity_state = 1;
            
            if (progress_icon == NULL)
                progress_icon = e_icon_factory_get_icon ("stock_mail-unread", E_ICON_SIZE_MENU);
            
            MAIL_MT_UNLOCK (mail_msg_lock);
            if (msg->ops->describe_msg)
                what = msg->ops->describe_msg (msg, FALSE);
            /* uncommenting because message is not very useful for a user, see bug 271734*/
            else {
                what = g_strdup_printf("Working %p", msg);
            }
            

            data->activity_id = e_activity_handler_operation_started (activity_handler, "evolution-mail", progress_icon, what, TRUE);
            
            g_free (what);
            
            MAIL_MT_LOCK (mail_msg_lock);
            if (data->activity_state == 3) {
                MAIL_MT_UNLOCK (mail_msg_lock);
                if (msg->cancel)
                    camel_operation_unref (msg->cancel);
                camel_exception_clear (&msg->ex);
                g_free (msg->priv);
                g_free (msg);
            } else {
                data->activity_state = 2;
                MAIL_MT_UNLOCK (mail_msg_lock);
            }
            return;
        }
    } else if (data->activity_id != 0) {
        MAIL_MT_UNLOCK (mail_msg_lock);
        e_activity_handler_operation_progressing (activity_handler, data->activity_id, out, (double)(pc/100.0));
    } else {
        MAIL_MT_UNLOCK (mail_msg_lock);
    }
}

static void
do_op_status_free (struct _mail_msg *mm)
{
    struct _op_status_msg *m = (struct _op_status_msg *)mm;

    g_free (m->what);
}

static struct _mail_msg_op op_status_op = {
    NULL,
    do_op_status,
    NULL,
    do_op_status_free,
};

static void
mail_operation_status (struct _CamelOperation *op, const char *what, int pc, void *data)
{
    struct _op_status_msg *m;
    
    d(printf("got operation statys: %s %d%%\n", what, pc));

    m = mail_msg_new(&op_status_op, NULL, sizeof(*m));
    m->op = op;
    m->what = g_strdup(what);
    switch (pc) {
    case CAMEL_OPERATION_START:
        pc = 0;
        break;
    case CAMEL_OPERATION_END:
        pc = 100;
        break;
    }
    m->pc = pc;
    m->data = data;
    e_msgport_put(mail_gui_port, (EMsg *)m);
}

/* ******************** */

static void
set_stop (int sensitive)
{
    static int last = FALSE;
    
    if (last == sensitive)
        return;
    
    /*bonobo_ui_component_set_prop (uic, "/commands/MailStop", "sensitive", sensitive ? "1" : "0", NULL);*/
    last = sensitive;
}