NAME
puffs_cc —
puffs continuation routines
LIBRARY
library “libpuffs”
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 throughpuffs_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
NULLif 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 continued
when the event it was waiting for triggers. Alternatively, the
puffs_framebuf(3) framework and
puffs_mainloop()
can be used for handling this automatically.