path: root/mail/mail-mt.c

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include <glib.h>

#include <gtk/gtkentry.h>
#include <gtk/gtkmain.h>
#include <gtk/gtkwidget.h>
#include <gtk/gtkcheckbutton.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-stock.h>
#include <gal/widgets/e-gui-utils.h>
#include <gal/widgets/e-unicode.h>

#include "folder-browser-factory.h"
#include "e-util/e-msgport.h"
#include "camel/camel-operation.h"

#include "evolution-activity-client.h"

#include "mail-config.h"
#include "camel/camel-url.h"
#include "mail-mt.h"

#include "component-factory.h"

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

static void set_stop(int sensitive);
static void mail_enable_stop(void);
static void mail_disable_stop(void);
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, "%ld: lock " # x "\n", pthread_self()):0, pthread_mutex_lock(&x))
#define MAIL_MT_UNLOCK(x) (log_locks?fprintf(log, "%ld: unlock " # x "\n", 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
extern EvolutionShellClient *global_shell_client;

/* 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 */
    EvolutionActivityClient *activity;
};

/* This is used for the mail status bar, cheap and easy */
#include "art/mail-new.xpm"

static GdkPixbuf *progress_icon[2] = { NULL, 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 = %ld\n\n", mail_gui_thread);
                    fprintf(log, "%ld: lock mail_msg_lock\n", 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, (void *)msg->seq);
    camel_exception_init(&msg->ex);
    msg->priv = g_malloc0(sizeof(*msg->priv));

    g_hash_table_insert(mail_msg_active_table, (void *)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;
}

/* either destroy the progress (in event_data), or the whole dialogue (in data) */
static void destroy_objects(CamelObject *o, void *event_data, void *data)
{
    if (event_data)
        gtk_object_unref(event_data);
}

#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;
    void *activity = NULL;

#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\n", msg);
#endif
    g_hash_table_remove(mail_msg_active_table, (void *)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 = m->priv->activity;
    }

    MAIL_MT_UNLOCK(mail_msg_lock);

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

    if (activity)
        mail_async_event_emit(mail_async_event, destroy_objects, NULL, activity, NULL);
}

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

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

void mail_msg_check_error(void *msg)
{
    struct _mail_msg *m = msg;
    char *what = NULL;
    char *text;
    GnomeDialog *gd;

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

    if (!camel_exception_is_set(&m->ex)
        || m->ex.id == CAMEL_EXCEPTION_USER_CANCEL)
        return;

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

    if (m->ops->describe_msg)
        what = m->ops->describe_msg(m, FALSE);

    if (what) {
        text = g_strdup_printf(_("Error while '%s':\n%s"), what, camel_exception_get_description(&m->ex));
        g_free (what);
    } else
        text = g_strdup_printf(_("Error while performing operation:\n%s"), camel_exception_get_description(&m->ex));

    /* 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 occured while existing dialogue active:\n%s", text);
        g_free(text);
        return;
    }

    gd = (GnomeDialog *)gnome_error_dialog(text);
    g_hash_table_insert(active_errors, m->ops, gd);
    g_free(text);
    gtk_signal_connect((GtkObject *)gd, "destroy", error_gone, m->ops);
    gnome_dialog_set_close(gd, TRUE);
    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, (void *)msgid);

    if (m)
        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_self() == mail_gui_thread;

    if (ismain) {
        MAIL_MT_LOCK(mail_msg_lock);
        m = g_hash_table_lookup(mail_msg_active_table, (void *)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, (void *)msgid);
        }
        MAIL_MT_UNLOCK(mail_msg_lock);
    } else {
        MAIL_MT_LOCK(mail_msg_lock);
        m = g_hash_table_lookup(mail_msg_active_table, (void *)msgid);
        while (m) {
            pthread_cond_wait(&mail_msg_cond, &mail_msg_lock);
            m = g_hash_table_lookup(mail_msg_active_table, (void *)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, (void *)msgid) != NULL;
    MAIL_MT_UNLOCK(mail_msg_lock);

    return active;
}

void mail_msg_wait_all(void)
{
    int ismain = 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);
    }
}

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

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\n", m);
#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 %ld: '%s'\n", m, 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 %ld\n", m, 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);
    }
}

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);
}

void mail_msg_init(void)
{
    mail_gui_reply_port = e_msgport_new();
    mail_gui_reply_channel = g_io_channel_unix_new(e_msgport_fd(mail_gui_reply_port));
    g_io_add_watch(mail_gui_reply_channel, G_IO_IN, mail_msgport_replied, mail_gui_reply_port);

    mail_gui_port = e_msgport_new();
    mail_gui_channel = g_io_channel_unix_new(e_msgport_fd(mail_gui_port));
    mail_gui_watch = g_io_add_watch(mail_gui_channel, G_IO_IN, mail_msgport_received, mail_gui_port);

    /* experimental temporary */
    mail_gui_port2 = e_msgport_new();
    mail_gui_channel2 = g_io_channel_unix_new(e_msgport_fd(mail_gui_port2));
    mail_gui_watch2 = g_io_add_watch(mail_gui_channel2, G_IO_IN, mail_msgport_received2, mail_gui_port2);


    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;

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

#if 0
static GnomeDialog *password_dialogue = NULL;
static EDList password_list = E_DLIST_INITIALISER(password_list);
static struct _pass_msg *password_current = NULL;

static void do_get_pass (struct _mail_msg *mm);

struct _pass_msg {
    struct _mail_msg msg;
    const char *prompt;
    gboolean secret;
    gboolean *cache;
    char *result;
    char *service_url;
    GtkWidget *check;
    int inmain;
};

static void
pass_got (char *string, void *data)
{
    struct _pass_msg *m = data;

    printf("password got!  string = '%s'\n", string?string:"<nil>");
    
    if (string) {
        MailConfigService *service = NULL;
        const MailConfigAccount *mca;
        gboolean remember;
        
        m->result = g_strdup (string);
        
        remember = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (m->check));
        if (m->service_url) {
            mca = mail_config_get_account_by_source_url (m->service_url);
            if (mca) {
                service = mca->source;
            } else {
                mca = mail_config_get_account_by_transport_url (m->service_url);
                if (mca)
                    service = mca->transport;
            }
            
            if (service) {
                mail_config_service_set_save_passwd (service, remember);
                
                /* set `remember' to TRUE because people don't want to have to
                   re-enter their passwords for this session even if they told
                   us not to cache their passwords in the dialog...*sigh* */
                remember = TRUE;
            }
        }
        
        if (m->cache)
            *(m->cache) = remember;

    }

    if (!m->inmain)
        e_msgport_reply((EMsg *)m);

    password_dialogue = NULL;

    m = e_dlist_remhead(&password_list);
    if (m) {
        printf("Have queued password request, showing now the other is finished\n");
        do_get_pass(m);
    }
}

static void
do_get_pass (struct _mail_msg *mm)
{
    struct _pass_msg *m = (struct _pass_msg *)mm;
    const MailConfigAccount *mca = NULL;
    GtkWidget *dialogue;
    GtkWidget *check, *entry;
    GList *children, *iter;
    gboolean show;
    char *title;

    /* If we already have a password_dialogue up, save this request till later */
    if (!m->inmain && password_dialogue) {
        e_dlist_addtail(&password_list, (EDListNode *)mm);
        return;
    }

    password_current = m;

    /* this api is just awful ... hence the hacks */
    dialogue = gnome_request_dialog (m->secret, m->prompt, NULL, 0, pass_got, m, NULL);
    
    /* Remember the password? */
    check = gtk_check_button_new_with_label (m->service_url ? _("Remember this password") :
                         _("Remember this password for the remainder of this session"));
    show = TRUE;
    
    if (m->service_url) {
        mca = mail_config_get_account_by_source_url (m->service_url);
        if (mca)
            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), mca->source->save_passwd);
        else {
            mca = mail_config_get_account_by_transport_url (m->service_url);
            if (mca)
                gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), mca->transport->save_passwd);
            else {
                d(printf ("Cannot figure out which account owns URL \"%s\"\n", m->service_url));
                show = FALSE;
            }
        }
    }
    
    if (show)
        gtk_widget_show (check);
    
    /* do some dirty stuff to put the checkbutton after the entry */
    entry = NULL;
    children = gtk_container_children (GTK_CONTAINER (GNOME_DIALOG (dialogue)->vbox));
    for (iter = children; iter; iter = iter->next) {
        if (GTK_IS_ENTRY (iter->data)) {
            entry = GTK_WIDGET (iter->data);
            break;
        }
    }
    g_list_free (children);
    
    if (entry) {
        gtk_object_ref (GTK_OBJECT (entry));
        gtk_container_remove (GTK_CONTAINER (GNOME_DIALOG (dialogue)->vbox), entry);
    }
    
    gtk_box_pack_end (GTK_BOX (GNOME_DIALOG (dialogue)->vbox), check, TRUE, FALSE, 0);
    
    if (entry) {
        gtk_box_pack_end (GTK_BOX (GNOME_DIALOG (dialogue)->vbox), entry, TRUE, FALSE, 0);
        gtk_widget_grab_focus (entry);
        gtk_object_unref (GTK_OBJECT (entry));
    }
    
    m->check = check;
    
    /* hrm, we can't run this async since the gui_port from which we're called
       will reply to our message for us */
    
    if (mca) {
        char *name;
        
        name = e_utf8_to_gtk_string (GTK_WIDGET (dialogue), mca->name);
        title = g_strdup_printf (_("Enter Password for %s"), name);
        g_free (name);
    } else
        title = g_strdup (_("Enter Password"));
    
    gtk_window_set_title (GTK_WINDOW (dialogue), title);
    g_free (title);

    if (m->inmain) {
        printf("showing dialogue in main\n");
        password_current = NULL;
        gnome_dialog_run_and_close ((GnomeDialog *)dialogue);
        e_msgport_reply((EMsg *)m);
    } else {
        printf("showing dialogue async\n");
        gtk_widget_show(dialogue);
    }
}

static void
do_free_pass(struct _mail_msg *mm)
{
    /*struct _pass_msg *m = (struct _pass_msg *)mm;*/
    
    /* the string is passed out so we dont need to free it */
}

struct _mail_msg_op get_pass_op = {
    NULL,
    do_get_pass,
    NULL,
    do_free_pass,
};

/* returns the password, or NULL if cancelled */
char *
mail_get_password (CamelService *service, const char *prompt, gboolean secret, gboolean *cache)
{
    char *ret;
    struct _pass_msg *m, *r;
    EMsgPort *pass_reply;
    
    pass_reply = e_msgport_new ();
    
    m = mail_msg_new (&get_pass_op, pass_reply, sizeof (struct _pass_msg));
    
    m->prompt = prompt;
    m->secret = secret;
    m->cache = cache;
    m->inmain = pthread_self() == mail_gui_thread;
    if (service) {
        m->service_url = camel_url_to_string (service->url, CAMEL_URL_HIDE_ALL);
    } else
        m->service_url = NULL;
    
    if (m->inmain) {
        do_get_pass ((struct _mail_msg *)m);
        r = m;
    } else {
        e_msgport_put (mail_gui_port2, (EMsg *)m);
        e_msgport_wait (pass_reply);
        r = (struct _pass_msg *)e_msgport_get (pass_reply);
    }
    
    g_assert (r == m);
    
    ret = m->result;
    
    g_free (m->service_url);
    mail_msg_free (m);
    e_msgport_destroy (pass_reply);
    
    return ret;
}
#endif

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

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

struct _user_message_msg {
    struct _mail_msg msg;
    const char *type;
    const char *prompt;
    gboolean allow_cancel;
    gboolean result;
};

static void
do_user_message (struct _mail_msg *mm)
{
    struct _user_message_msg *m = (struct _user_message_msg *)mm;
    int dialog_result;
    GtkWidget *dialog;
    
    dialog = gnome_message_box_new (m->prompt, m->type,
                    GNOME_STOCK_BUTTON_OK,
                    m->allow_cancel ? GNOME_STOCK_BUTTON_CANCEL : NULL,
                    NULL);
    gnome_dialog_set_default (GNOME_DIALOG (dialog), 1);
    gtk_window_set_policy (GTK_WINDOW (dialog), TRUE, TRUE, TRUE);
    
    /* hrm, we can't run this async since the gui_port from which we're called
       will reply to our message for us */
    dialog_result = gnome_dialog_run_and_close (GNOME_DIALOG (dialog));

    if (dialog_result == -1 || dialog_result == 1)
        m->result = FALSE;
    else
        m->result = TRUE;
}

struct _mail_msg_op user_message_op = {
    NULL,
    do_user_message,
    NULL,
    NULL,
};

/* prompt the user with a yes/no question and return the response */
gboolean
mail_user_message (const char *type, const char *prompt, gboolean allow_cancel)
{
    struct _user_message_msg *m, *r;
    EMsgPort *user_message_reply;
    gboolean accept;
    
    user_message_reply = e_msgport_new ();
    
    m = mail_msg_new (&user_message_op, user_message_reply, sizeof (*m));
    
    m->type = type;
    m->prompt = prompt;
    m->allow_cancel = allow_cancel;
    
    if (pthread_self () == mail_gui_thread) {
        do_user_message ((struct _mail_msg *)m);
        r = m;
    } else {
        static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
        
        /* we want this single-threaded, this is the easiest way to do it without blocking ? */
        pthread_mutex_lock (&lock);
        e_msgport_put (mail_gui_port, (EMsg *)m);
        e_msgport_wait (user_message_reply);
        r = (struct _user_message_msg *)e_msgport_get (user_message_reply);
        pthread_mutex_unlock (&lock);
    }
    
    g_assert (r == m);
    
    accept = m->result;
    
    mail_msg_free (m);
    e_msgport_destroy (user_message_reply);
    
    return accept;
}

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

struct _proxy_msg {
    struct _mail_msg msg;
    MailAsyncEvent *ea;
    CamelObjectEventHookFunc func;
    CamelObject *o;
    void *event_data;
    void *data;
};

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

    m->func(m->o, m->event_data, m->data);

    g_mutex_lock(m->ea->lock);
    m->ea->tasks = g_slist_remove(m->ea->tasks, (void *)mm->seq);
    g_mutex_unlock(m->ea->lock);

}

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, CamelObjectEventHookFunc func, CamelObject *o, void *event_data, void *data)
{
    struct _proxy_msg *m;
    int id;
    int ismain = pthread_self() == mail_gui_thread;

    if (ismain) {
        func(o, event_data, data);
        /* id of -1 is 'always finished' */
        return -1;
    } else {
        /* 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;

        id = m->msg.seq;
        g_mutex_lock(ea->lock);
        ea->tasks = g_slist_prepend(ea->tasks, (void *)id);
        g_mutex_unlock(ea->lock);
        e_msgport_put(mail_gui_port, (EMsg *)m);
        return id;
    }
}

void mail_async_event_destroy(MailAsyncEvent *ea)
{
    int id;

    g_mutex_lock(ea->lock);
    while (ea->tasks) {
        id = (int)ea->tasks->data;
        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);
}

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

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_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;
    }
}

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_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);
}

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

static 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);
}

static 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)
{
    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;
    EvolutionActivityClient *activity;
    
    g_assert (mail_gui_thread == pthread_self ());
    
    MAIL_MT_LOCK (mail_msg_lock);
    
    msg = g_hash_table_lookup (mail_msg_active_table, m->data);

    /* shortcut processing, i.e. if we have no global_shell_client and no activity, we can't create one */
    if (msg == NULL || (msg->priv->activity == NULL && global_shell_client == 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;
    
    /* so whats all this crap about:
     * When we call activity_client, we have a chance of coming
     * back to code that will call mail_msg_new or one of many
     * calls which may deadlock us.  So we need to call corba
     * outside of the lock.  The activity_state thing is so we can
     * properly lock data->activity without having to hold a lock
     * ... of course we have to be careful in the free function to
     * keep track of it too.
     */
    if (data->activity == NULL && global_shell_client) {
        char *what;
        int display;
        
        /* 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[0] == NULL)
                progress_icon[0] = gdk_pixbuf_new_from_xpm_data ((const char **)mail_new_xpm);
            
            MAIL_MT_UNLOCK (mail_msg_lock);
            if (msg->ops->describe_msg)
                what = msg->ops->describe_msg (msg, FALSE);
            else
                what = _("Working");
            
            if (global_shell_client) {
                activity = evolution_activity_client_new (global_shell_client,
                                      COMPONENT_ID,
                                      progress_icon, what, TRUE,
                                      &display);
            } else {
                activity = NULL;
            }
            
            if (msg->ops->describe_msg)
                g_free (what);
            
            MAIL_MT_LOCK (mail_msg_lock);
            if (data->activity_state == 3) {
                MAIL_MT_UNLOCK (mail_msg_lock);
                if (activity)
                    gtk_object_unref (GTK_OBJECT (activity));
                camel_operation_unref (msg->cancel);
                camel_exception_clear (&msg->ex);
                g_free (msg->priv);
                g_free (msg);
            } else {
                data->activity_state = 2;
                data->activity = activity;
                MAIL_MT_UNLOCK (mail_msg_lock);
            }
            return;
        }
    } else if (data->activity) {
        activity = data->activity;
        gtk_object_ref (GTK_OBJECT (activity));
        MAIL_MT_UNLOCK (mail_msg_lock);
            
        evolution_activity_client_update (activity, out, (double)(pc/100.0));
        gtk_object_unref (GTK_OBJECT (activity));
    } 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);
}

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)
{
    EList *controls;
    EIterator *it;
    static int last = FALSE;

    if (last == sensitive)
        return;

    controls = folder_browser_factory_get_control_list ();
    for (it = e_list_get_iterator (controls); e_iterator_is_valid (it); e_iterator_next (it)) {
        BonoboControl *control;
        BonoboUIComponent *uic;

        control = BONOBO_CONTROL (e_iterator_get (it));
        uic = bonobo_control_get_ui_component (control);
        if (uic == CORBA_OBJECT_NIL || bonobo_ui_component_get_container(uic) == CORBA_OBJECT_NIL)
            continue;

        bonobo_ui_component_set_prop(uic, "/commands/MailStop", "sensitive", sensitive?"1":"0", NULL);
    }
    gtk_object_unref(GTK_OBJECT(it));
    last = sensitive;
}