puffs_cc(3) - NetBSD Manual Pages

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PUFFS_CC(3)             NetBSD Library Functions Manual            PUFFS_CC(3)


NAME

     puffs_cc -- puffs continuation routines


LIBRARY

     puffs Convenience Library (libpuffs, -lpuffs)


SYNOPSIS

     #include <puffs.h>

     void
     puffs_cc_yield(struct puffs_cc *pcc);

     void
     puffs_cc_continue(struct puffs_cc *pcc);

     void
     puffs_cc_schedule(struct puffs_cc *pcc);

     struct puffs_cc *
     puffs_cc_getcc(struct puffs_usermount *pu);


DESCRIPTION

     These routines are used for the cooperative multitasking suite present in
     puffs.

     puffs_cc_yield(pcc)
           Suspend and save the current execution context and return control
           to the previous point.  In practice, from the file system author
           perspective, control returns back to where either the mainloop or
           where puffs_dispatch_exec() was called from.

     puffs_cc_continue(pcc)
           Will suspend current execution and return control to where it was
           before before calling puffs_cc_yield().  This is rarely called
           directly but rather through puffs_dispatch_exec().

     puffs_cc_schedule(pcc)
           Schedule a continuation.  As opposed to puffs_cc_continue() this
           call returns immediately.  pcc will be scheduled sometime in the
           future.

     puffs_cc_getcc(pu)
           Returns the current pcc or NULL if this is the main thread.  NOTE:
           The argument pu will most likely disappear at some point.

     Before calling puffs_cc_yield() a file system will typically want to
     record some cookie value into its own internal bookkeeping.  This cookie
     should be hooked to the pcc so that the correct continuation can be con-
     tinued when the event it was waiting for triggers.  Alternatively, the
     puffs_framebuf(3) framework and puffs_mainloop() can be used for handling
     this automatically.


SEE ALSO

     puffs(3), puffs_framebuf(3)

NetBSD 5.1                     January 28, 2008                     NetBSD 5.1