Removed YIELD call since we're waiting for ringbuf semaphore instead.

incom() now supports timeout parameter (defaults to 0).

(Ctrl-L).

each write), must define RINGBUF_SEM.

The semaphore emulation lib provides for sem_timedwait() which will allow
correct blocking calls to be used rather than bogus (On *nix anyways)
arbitrary 1-55ms (depending on hardware) wait during a loop to avoid 100%
CPU utilization.

The xpsem lib uses mutexes to provide semaphore functions and is taken
almost line-per-line from FreeBSD.  (copyright left intact)

**** WARNING ****
This commit was performed while drunk.  If this breaks your build, I
personally guarantee you get to keep all remaning pieces.

Note: Some systems do not have daemon() noteably Solaris... for these
systems, daemon() is in sbbscon... not sure if this will break any utils
ion those platforms or not.

problem where a click is sent to adjacent icons.

to security, credits, etc. immediately effective.

permanently locked under some circumstances on Win32.

deleted after QWK-packing.

10ms delay) - should improve performance of NT FOSSIL driver.

Event and a Semaphore (using sem_init).
output_sem is now initialized immediately in sbbs_t::init() so if init() fails,
the semaphore can be destroyed without causing a segfault.

Node: This SHOULD pass command-line arguments to child make but doesn't/

Eliminated some comment-out code.

Checking return value of getnodedat() before calling putnodedat().