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+ Added NanoSleep

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michael 2002-08-30 06:37:15 +00:00
parent b963ca1c2a
commit f017203411
1 changed files with 32 additions and 2 deletions
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34
docs/linux.tex
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@ -216,6 +216,13 @@ TimeVal = Record
end; end;
PTimeVal = ^TimeVal; PTimeVal = ^TimeVal;
\end{verbatim} \end{verbatim}
The \var{timespec} record is needed in the \seef{NanoSleep} function:
\begin{verbatim}
timespec = packed record
tv_sec,tv_nsec:longint;
end;
\end{verbatim}
The \seep{Uname} function uses the \var{utsname} to return information about The \seep{Uname} function uses the \var{utsname} to return information about
the current kernel : the current kernel :
\begin{verbatim} \begin{verbatim}
@ -562,6 +569,7 @@ Functions for managing and responding to signals.
\procref{SigProcMask}{Set signal processing mask} \procref{SigProcMask}{Set signal processing mask}
\procref{SigRaise}{Send signal to self} \procref{SigRaise}{Send signal to self}
\procref{SigSuspend}{Sets signal mask and waits for signal} \procref{SigSuspend}{Sets signal mask and waits for signal}
\funcref{NanoSleep}{Waits for a specific amount of time}
\end{funclist} \end{funclist}
\subsection{System information} \subsection{System information}
@ -2502,11 +2510,33 @@ is set to an error value. See \seef{MMap} for possible error values.
For an example, see \seef{MMap}. For an example, see \seef{MMap}.
\begin{function}{NanoSleep}
\Declaration
Function NanoSleep(const req : timespec;var rem : timespec) : longint;
\Description
\var{NanoSleep} suspends the process till a time period as specified
in \var{req} has passed. Then the function returns. If the
call was interrupted (e.g. by some signal) then the function may
return earlier, and \var{rem} will contain the remaining time till the
end of the intended period. In this case the return value will be
-1, and \var{LinuxError} will be set to \var{EINTR}
If the function returns without error, the return value is zero.
\Errors
If the call was interrupted, -1 is returned, and \var{LinuxError} is set
to \var{EINTR}. If invalid time values were specified, then -1 is returned
and \var{LinuxError} is set to \var{EINVAL}.
\SeeAlso
\seep{Pause}, \seef{Alarm}
\end{function}
\FPCexample{ex70}
\begin{procedure}{Nice} \begin{procedure}{Nice}
\Declaration \Declaration
Procedure Nice ( N : Integer); Procedure Nice ( N : Integer);
\Description \Description
Nice adds \var{-N} to the priority of the running process. The lower the \var{Nice} adds \var{-N} to the priority of the running process. The lower the
priority numerically, the less the process is favored. priority numerically, the less the process is favored.
Only the superuser can specify a negative \var{N}, i.e. increase the rate at Only the superuser can specify a negative \var{N}, i.e. increase the rate at
which the process is run. which the process is run.
@ -3419,7 +3449,7 @@ behaves:
exited. exited.
\item [WUNTRACED] Causes \var{WaitPid} to return also for children which are \item [WUNTRACED] Causes \var{WaitPid} to return also for children which are
stopped, but whose status has not yet been reported. stopped, but whose status has not yet been reported.
\item[__WCLONE] Causes \var{WaitPid} also to wait for threads created by \item[\_\_WCLONE] Causes \var{WaitPid} also to wait for threads created by
the \seef{Clone} call. the \seef{Clone} call.
\end{description} \end{description}
Upon return, it returns the exit status of the process, or -1 in case of Upon return, it returns the exit status of the process, or -1 in case of