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many changes associated will disconnecting the channel but not disconnecting the circuit

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This commit is contained in:
Jeff Hill
2004-01-09 00:42:15 +00:00
parent 60dde019c0
commit f04fa5fdf3
62 changed files with 3591 additions and 2586 deletions
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89
src/ca/searchTimer.cpp
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@@ -23,6 +23,10 @@
#define epicsAssertAuthor "Jeff Hill johill@lanl.gov"
#if 0
#define DEBUG
#endif
#include "tsMinMax.h"
#define epicsExportSharedSymbols
@@ -47,7 +51,7 @@ searchTimer::searchTimer ( udpiiu & iiuIn,
iiu ( iiuIn ),
mutex ( mutexIn ),
framesPerTry ( initialTriesPerFrame ),
framesPerTryCongestThresh ( UINT_MAX ),
framesPerTryCongestThresh ( DBL_MAX ),
minRetry ( 0 ),
minRetryThisPass ( UINT_MAX ),
searchAttempts ( 0u ),
@@ -55,7 +59,8 @@ searchTimer::searchTimer ( udpiiu & iiuIn,
searchAttemptsThisPass ( 0u ),
searchResponsesThisPass ( 0u ),
dgSeqNoAtTimerExpireBegin ( 0u ),
dgSeqNoAtTimerExpireEnd ( 0u )
dgSeqNoAtTimerExpireEnd ( 0u ),
stopped ( false )
{
}
@@ -64,22 +69,30 @@ searchTimer::~searchTimer ()
this->timer.destroy ();
}
void searchTimer::shutdown ()
{
this->stopped = true;
this->timer.cancel ();
}
void searchTimer::newChannelNotify (
epicsGuard < udpMutex > & guard, const epicsTime & currentTime,
bool firstChannel, unsigned minRetryNo )
{
if ( firstChannel ) {
this->recomputeTimerPeriod ( guard, minRetryNo );
double newPeriod = this->period;
{
// avoid timer cancel block deadlock
epicsGuardRelease < udpMutex > unguard ( guard );
this->timer.start ( *this, currentTime + newPeriod );
if ( ! this->stopped ) {
if ( firstChannel ) {
this->recomputeTimerPeriod ( guard, minRetryNo );
double newPeriod = this->period;
{
// avoid timer cancel block deadlock
epicsGuardRelease < udpMutex > unguard ( guard );
this->timer.start ( *this, currentTime + newPeriod );
}
}
else {
this->recomputeTimerPeriodAndStartTimer ( guard,
currentTime, minRetryNo, 0.0 );
}
}
else {
this->recomputeTimerPeriodAndStartTimer ( guard,
currentTime, minRetryNo, 0.0 );
}
}
@@ -110,7 +123,7 @@ void searchTimer::recomputeTimerPeriod (
void searchTimer::recomputeTimerPeriodAndStartTimer ( epicsGuard < udpMutex > & guard,
const epicsTime & currentTime, unsigned minRetryNew, const double & initialDelay )
{
if ( this->iiu.channelCount ( guard ) == 0 ) {
if ( this->iiu.unresolvedChannelCount ( guard ) == 0 || this->stopped ) {
return;
}
@@ -159,7 +172,7 @@ void searchTimer::recomputeTimerPeriodAndStartTimer ( epicsGuard < udpMutex > &
void searchTimer::notifySearchResponse ( epicsGuard < udpMutex > & guard,
ca_uint32_t respDatagramSeqNo, bool seqNumberIsValid, const epicsTime & currentTime )
{
if ( this->iiu.channelCount ( guard ) == 0 ) {
if ( this->iiu.unresolvedChannelCount ( guard ) == 0 || this->stopped ) {
return;
}
@@ -186,14 +199,7 @@ void searchTimer::notifySearchResponse ( epicsGuard < udpMutex > & guard,
}
if ( reschedualNeeded ) {
# if defined(DEBUG) && 0
char buf[64];
epicsTime ts = currentTime;
ts.strftime ( buf, sizeof(buf), "%M:%S.%09f");
# endif
// debugPrintf ( ( "Response set timer delay to zero. ts=%s\n",
// buf ) );
debugPrintf ( ( "Response set timer delay to zero\n" ) );
// avoid timer cancel block deadlock
epicsGuardRelease < udpMutex > unguard ( guard );
this->timer.start ( *this, currentTime );
@@ -208,12 +214,13 @@ epicsTimerNotify::expireStatus searchTimer::expire ( const epicsTime & currentTi
epicsGuard < udpMutex > guard ( this->mutex );
// check to see if there is nothing to do here
if ( this->iiu.channelCount ( guard ) == 0 ) {
if ( this->iiu.unresolvedChannelCount ( guard ) == 0 ) {
debugPrintf ( ( "all channels located - search timer terminating\n" ) );
this->period = DBL_MAX;
return noRestart;
}
#if 0
//
// dynamically adjust the number of UDP frames per
// try depending how many search requests are not
@@ -260,9 +267,37 @@ epicsTimerNotify::expireStatus searchTimer::expire ( const epicsTime & currentTi
this->framesPerTry--;
}
this->framesPerTryCongestThresh = this->framesPerTry/2 + 1;
debugPrintf ( ("Congestion detected - set frames per try to %f t=%u r=%u\n",
this->framesPerTry, this->searchAttempts, this->searchResponses) );
}
#else
if ( this->searchResponses == this->searchAttempts ) {
// increase UDP frames per try if we have a good score
if ( this->framesPerTry < maxTriesPerFrame ) {
// a congestion avoidance threshold similar to TCP is now used
if ( this->framesPerTry < this->framesPerTryCongestThresh ) {
double doubled = 2 * this->framesPerTry;
if ( doubled > this->framesPerTryCongestThresh ) {
this->framesPerTry = this->framesPerTryCongestThresh;
}
else {
this->framesPerTry = doubled;
}
}
else {
this->framesPerTry += 1.0 / this->framesPerTry;
}
debugPrintf ( ("Increasing frame count to %u t=%u r=%u\n",
this->framesPerTry, this->searchAttempts, this->searchResponses) );
}
}
else {
this->framesPerTryCongestThresh = this->framesPerTry / 2.0;
this->framesPerTry = 1u;
debugPrintf ( ("Congestion detected - set frames per try to %u t=%u r=%u\n",
this->framesPerTry, this->searchAttempts, this->searchResponses) );
}
#endif
if ( this->searchAttemptsThisPass <= UINT_MAX - this->searchAttempts ) {
this->searchAttemptsThisPass += this->searchAttempts;
@@ -287,7 +322,7 @@ epicsTimerNotify::expireStatus searchTimer::expire ( const epicsTime & currentTi
while ( true ) {
// check to see if we have reached the end of the list
if ( this->searchAttemptsThisPass >= this->iiu.channelCount ( guard ) ) {
if ( this->searchAttemptsThisPass >= this->iiu.unresolvedChannelCount ( guard ) ) {
// if we are making some progress then dont increase the
// delay between search requests
if ( this->searchResponsesThisPass == 0u ) {
@@ -330,7 +365,7 @@ epicsTimerNotify::expireStatus searchTimer::expire ( const epicsTime & currentTi
//
// dont send any of the channels twice within one try
//
if ( nChanSent >= this->iiu.channelCount ( guard ) ) {
if ( nChanSent >= this->iiu.unresolvedChannelCount ( guard ) ) {
//
// add one to nFrameSent because there may be
// one more partial frame to be sent
@@ -363,7 +398,7 @@ epicsTimerNotify::expireStatus searchTimer::expire ( const epicsTime & currentTi
nFrameSent, this->period, buf ) );
# endif
if ( this->iiu.channelCount ( guard ) == 0 ) {
if ( this->iiu.unresolvedChannelCount ( guard ) == 0 ) {
debugPrintf ( ( "all channels connected\n" ) );
this->period = DBL_MAX;
return noRestart;