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added POSIX real-time scheduling

This commit is contained in:
darkeye 2000-12-20 12:36:47 +00:00
parent 254e7e36a4
commit 2b05be870a
4 changed files with 136 additions and 4 deletions
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3
darkice/trunk/configure.h.in
View File

@ -30,6 +30,9 @@
/* Define if you have the <netinet/in.h> header file. */
#undef HAVE_NETINET_IN_H
/* Define if you have the <sched.h> header file. */
#undef HAVE_SCHED_H
/* Define if you have the <signal.h> header file. */
#undef HAVE_SIGNAL_H

1
darkice/trunk/configure.in
View File

@ -11,6 +11,7 @@ dnl AC_STDC_HEADERS
AC_HAVE_HEADERS(errno.h fcntl.h stdio.h stdlib.h string.h unistd.h limits.h)
AC_HAVE_HEADERS(getopt.h signal.h time.h sys/time.h sys/types.h sys/soundcard.h)
AC_HAVE_HEADERS(netdb.h netinet/in.h sys/ioctl.h sys/socket.h sys/stat.h)
AC_HAVE_HEADERS(sched.h)
AC_HEADER_SYS_WAIT()
AC_TYPE_PID_T()

105
darkice/trunk/src/DarkIce.cpp
View File

@ -40,6 +40,12 @@
#error need stdlib.h
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#else
#error need unistd.h
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#else
@ -58,6 +64,12 @@
#error need errno.h
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#else
#error need sched.h
#endif
#include <hash_map>
#include <string>
@ -264,6 +276,89 @@ DarkIce :: init ( const Config & config ) throw ( Exception )
}
/*------------------------------------------------------------------------------
* Set POSIX real-time scheduling, if super-user
*----------------------------------------------------------------------------*/
void
DarkIce :: setRealTimeScheduling ( void ) throw ( Exception )
{
uid_t euid;
euid = geteuid();
if ( euid == 0 ) {
int high_priority;
struct sched_param param;
/* store the old scheduling parameters */
if ( (origSchedPolicy = sched_getscheduler(0)) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_getscheduler", errno);
}
if ( sched_getparam( 0, &param) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
}
origSchedPriority = param.sched_priority;
/* set SCHED_FIFO with max - 1 priority */
if ( (high_priority = sched_get_priority_max(SCHED_FIFO)) == -1 ) {
throw Exception(__FILE__,__LINE__,"sched_get_priority_max",errno);
}
reportEvent( 8, "scheduler high priority", high_priority);
param.sched_priority = high_priority - 1;
if ( sched_setscheduler( 0, SCHED_FIFO, &param) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_setscheduler", errno);
}
/* ask the new priortiy and report it */
if ( sched_getparam( 0, &param) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
}
reportEvent( 1,
"Using POSIX real-time scheduling, priority",
param.sched_priority );
} else {
reportEvent( 1,
"Not running as super-user, unable to use POSIX real-time scheduling" );
reportEvent( 1,
"It is recommended that you run this program as super-user");
}
}
/*------------------------------------------------------------------------------
* Set the original scheduling of the process, the one prior to the
* setRealTimeScheduling call.
* WARNING: make sure you don't call this before setRealTimeScheduling!!
*----------------------------------------------------------------------------*/
void
DarkIce :: setOriginalScheduling ( void ) throw ( Exception )
{
uid_t euid;
euid = geteuid();
if ( euid == 0 ) {
struct sched_param param;
if ( sched_getparam( 0, &param) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
}
param.sched_priority = origSchedPriority;
if ( sched_setscheduler( 0, origSchedPolicy, &param) == -1 ) {
throw Exception( __FILE__, __LINE__, "sched_setscheduler", errno);
}
reportEvent( 5, "reverted to original scheduling");
}
}
/*------------------------------------------------------------------------------
* Run the encoder
*----------------------------------------------------------------------------*/
@ -289,10 +384,7 @@ DarkIce :: encode ( void ) throw ( Exception )
dsp->getChannel() *
duration;
len = encConnector->transfer( bytes,
4096,
1,
0 );
len = encConnector->transfer( bytes, 4096, 1, 0 );
reportEvent( 1, len, "bytes transfered to the encoders");
@ -364,7 +456,9 @@ DarkIce :: run ( void ) throw ( Exception )
// this is the parent
reportEvent( 3, "encoding");
setRealTimeScheduling();
encode();
setOriginalScheduling();
reportEvent( 3, "encoding ends");
for ( u = 0; u < noOutputs; ++u ) {
@ -387,6 +481,9 @@ DarkIce :: run ( void ) throw ( Exception )
$Source$
$Log$
Revision 1.12 2000/12/20 12:36:47 darkeye
added POSIX real-time scheduling
Revision 1.11 2000/11/18 11:13:27 darkeye
removed direct reference to cout, except from main.cpp
all class use the Reporter interface to report events

31
darkice/trunk/src/DarkIce.h
View File

@ -125,6 +125,16 @@ class DarkIce : public virtual Referable, public virtual Reporter
*/
unsigned int noOutputs;
/**
* Original scheduling policy
*/
int origSchedPolicy;
/**
* Original scheduling priority
*/
int origSchedPriority;
/**
* Initialize the object.
*
@ -135,6 +145,24 @@ class DarkIce : public virtual Referable, public virtual Reporter
void
init ( const Config & config ) throw ( Exception );
/**
* Set POSIX real-time scheduling for the encoding process,
* if user permissions enable it.
*
* @exception Exception
*/
void
setRealTimeScheduling ( void ) throw ( Exception );
/**
* Set the scheduling that was before setting real-time scheduling.
* This function must be called _only_ after setRealTimeScheduling.
*
* @exception Exception
*/
void
setOriginalScheduling ( void ) throw ( Exception );
/**
* Start encoding. Spawns all encoders, opens the dsp and
* starts sending data to the encoders.
@ -236,6 +264,9 @@ class DarkIce : public virtual Referable, public virtual Reporter
$Source$
$Log$
Revision 1.7 2000/12/20 12:36:47 darkeye
added POSIX real-time scheduling
Revision 1.6 2000/11/15 18:08:43 darkeye
added multiple verbosity-level event reporting and verbosity command
line option