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qthread_readFF - waits for the source to be full, then copies it
#include
<qthread.h>
int
qthread_readFF (aligned_t *dest, const aligned_t *src);
This
function waits for memory to become full, and then reads it and leaves
the memory as full. When memory becomes full, all threads waiting for it
to become full with a readFF will receive the value at once and will be
queued to run. Data is read from src and stored in dest.
The semantics of
readFF are:
1 - src’s FEB state must be "full"
2 - data is copied from src to dest
This, and all other FEB-related
functions currently operate exclusively on aligned data. This is to simulate
the behavior of the MTA as closely as possible. The library requires 4- or
8-byte alignment, depending on whether compiled in 32-bit or 64-bit mode.
On success, the memory address src is marked full, the address dest
is filled with the contents of src and 0 is returned. On error, an non-zero
error code is returned.
- ENOMEM
- Not enough memory could be allocated
for bookkeeping structures.
qthread_empty(3)
, qthread_fill(3)
, qthread_writeEF(3)
,
qthread_writeF(3)
, qthread_readFE(3)
, qthread_lock(3)
, qthread_unlock(3)
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