Hi all, attached is a larger patch which enables multi-threaded retrieval of POP3 messages. The biggest part of the patch is related to changes of the progress dialogue implementation, though. It also changes the preferences by replacing the old (retrieve) progress dialogue options by two simple check boxes for enabling the send and receive progress, respectively. As a side effect, we get rid of a bunch of global variables used for the POP3 progress communication between the main and retrieval threads which is a lot cleaner IMHO. BTW, the patch removes the (now obsolete) file src/threads.h. I noticed that the file libbalsa/gforest.c is not referenced everywhere – couldn't we remove it? As always, any comment is welcome! Cheers, Albrecht. --- Patch details: * libbalsa/libbalsa-marshal.list, libbalsa/mailbox.[ch]: new simplified signature for the mailbox '' signal and the related helper libbalsa_mailbox_progress_notify() * libbalsa/libbalsa-progress.[ch]: heavy re-factoring of the progress dialogue, including a fully thread-safe interface, simplified access functions, and a new activity mode * libbalsa/mailbox_pop3.c, libbalsa/send.[ch]: use new progress dialogue interface, pass option to disable send progress dialogue * src/balsa-app.[ch]: define and initialise enable progress dialogue settings, use changed send function signature * src/balsa-message.c, src/balsa-mime-widget-message.c, src/balsa-mime-widget-vcalendar.c, src/sendmsg-window.c: use changed send function signature * src/main-window.[ch]: implement multi-threaded POP3 retrieval, remove old progress implementation, use changed send function signature, replace two-state enum by bool * src/main.c: remove old progress implementation stuff * src/pref-manager.c: replace progress dialogue settings by two new bool values and related check boxes * src/save-restore.c: save/restore new progress dialogue bool values * src/threads.h: completely remove the file
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