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XrdPollPoll Class Reference

#include <XrdPollPoll.hh>

+ Inheritance diagram for XrdPollPoll:
+ Collaboration diagram for XrdPollPoll:

Public Member Functions

 XrdPollPoll (struct pollfd *pp, int numfd)
 
 ~XrdPollPoll ()
 
void Disable (XrdPollInfo &pInfo, const char *etxt=0)
 
int Enable (XrdPollInfo &pInfo)
 
void Start (XrdSysSemaphore *syncp, int &rc)
 

Protected Member Functions

void doDetach (int pti)
 
void Exclude (XrdPollInfo &pInfo)
 
int Include (XrdPollInfo &pInfo)
 

Detailed Description

Definition at line 38 of file XrdPollPoll.hh.

Constructor & Destructor Documentation

◆ XrdPollPoll()

XrdPollPoll::XrdPollPoll ( struct pollfd *  pp,
int  numfd 
)

Definition at line 65 of file XrdPollPoll.icc.

66{
67
68// Initialize the standard stuff
69//
70 PollTab = pp;
71 PollTNum= 0;
72 PollQ = 0;
73 maxent = numfd;
74}

◆ ~XrdPollPoll()

XrdPollPoll::~XrdPollPoll ( )

Definition at line 80 of file XrdPollPoll.icc.

81{
82 if (PollTab) free(PollTab);
83}

Member Function Documentation

◆ Disable()

void XrdPollPoll::Disable ( XrdPollInfo pInfo,
const char *  etxt = 0 
)
virtual

Implements XrdPoll.

Definition at line 133 of file XrdPollPoll.icc.

134{
135 XrdSysSemaphore mySem(0);
136 PipeData cmdbuff[2];
137 int myerrno = 0;
138
139// Check if this link is in the pollQ. If so, remove it.
140//
141 if (pInfo.inQ) dqLink(&pInfo);
142
143// Simply return if the link is already disabled
144//
145 if (!pInfo.isEnabled) return;
146
147// Trace this event
148//
149 TRACEI(POLL, "Poller " <<PID <<" async disabling link FD " <<pInfo.FD);
150
151// Send a disable request to the poller thread handling this link. We need to
152// wait until the operation is actually completed before returning.
153//
154 memset(&cmdbuff, 0, sizeof(cmdbuff));
155 cmdbuff[0].req = PipeData::DiFD;
156 cmdbuff[0].Parms.Arg.fd = pInfo.FD;
157 cmdbuff[0].Parms.Arg.ent = pInfo.PollEnt - PollTab;
158 cmdbuff[1].req = PipeData::Post;
159 cmdbuff[1].Parms.theSem = &mySem;
160 PollPipe.Lock();
161 if (write(CmdFD, &cmdbuff, sizeof(cmdbuff)) < 0) myerrno = errno;
163
164// Verify that all went well and if termination wanted, terminate the link
165//
166 if (myerrno) Log.Emsg("Poll", myerrno, "disable link", pInfo.Link.ID);
167 else {mySem.Wait();
168 if (etxt && Finish(pInfo, etxt))
169 Sched.Schedule((XrdJob *)&pInfo.Link);
170 }
171}
#define write(a, b, c)
Definition XrdPosix.hh:110
#define TRACEI(act, x)
Definition XrdTrace.hh:66
struct pollfd * PollEnt
XrdLink & Link
int PID
Definition XrdPoll.hh:82
XrdSysMutex PollPipe
Definition XrdPoll.hh:115
static int Finish(XrdPollInfo &pInfo, const char *etxt=0)
Definition XrdPoll.cc:204
int CmdFD
Definition XrdPoll.hh:117
void Schedule(XrdJob *jp)
int Emsg(const char *esfx, int ecode, const char *text1, const char *text2=0)
XrdSysError Log
Definition XrdConfig.cc:112
XrdScheduler Sched
Definition XrdLinkCtl.cc:54

References XrdPoll::CmdFD, XrdSysError::Emsg(), XrdPollInfo::FD, XrdPoll::Finish(), XrdLink::ID, XrdPollInfo::inQ, XrdPollInfo::isEnabled, XrdPollInfo::Link, XrdSysMutex::Lock(), XrdPoll::PipeData::Parms, XrdPoll::PID, XrdPollInfo::PollEnt, XrdPoll::PollPipe, XrdPoll::PipeData::req, XrdScheduler::Schedule(), TRACEI, XrdSysMutex::UnLock(), XrdSysSemaphore::Wait(), and write.

Referenced by Exclude().

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◆ doDetach()

void XrdPollPoll::doDetach ( int  pti)
protected

Definition at line 337 of file XrdPollPoll.icc.

338{
339 int lastent;
340
341// Get some starting values
342//
343 PollMutex.Lock();
344 if ((lastent = PollTNum-1) < 0)
345 {Log.Emsg("Poll","Underflow during detach"); abort();}
346
347 if (pti == lastent)
348 do {PollTNum--;} while(PollTNum && PollTab[PollTNum-1].fd == -1);
349 PollMutex.UnLock();
350}

References XrdSysError::Emsg(), XrdSysMutex::Lock(), and XrdSysMutex::UnLock().

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◆ Enable()

int XrdPollPoll::Enable ( XrdPollInfo pInfo)
virtual

Implements XrdPoll.

Definition at line 177 of file XrdPollPoll.icc.

178{
179 PipeData cmdbuff;
180 int myerrno = 0;
181
182// Simply return if the link is already enabled
183//
184 if (pInfo.isEnabled) return 1;
185
186// Add this link element to the queue
187//
188 PollMutex.Lock();
189 pInfo.Next = PollQ;
190 PollQ = &pInfo;
191 pInfo.inQ = true;
192 PollMutex.UnLock();
193
194// Send an enable request to the poller thread handling this link
195//
196 TRACEI(POLL, "sending poller " <<PID <<" enable for link " <<pInfo.FD);
197 cmdbuff.req = PipeData::EnFD;
198 cmdbuff.Parms.Arg.fd = pInfo.FD;
199 cmdbuff.Parms.Arg.ent = pInfo.PollEnt - PollTab;
200 PollPipe.Lock();
201 if (write(CmdFD, &cmdbuff, sizeof(cmdbuff)) < 0) myerrno = errno;
203
204// Verify that all went well. Note that the link stays in the pollQ.
205//
206 if (myerrno)
207 {Log.Emsg("Poll", myerrno, "enable link", pInfo.Link.ID); return 0;}
208
209// All done
210//
211 return 1;
212}
XrdPollInfo * Next

References XrdPoll::CmdFD, XrdSysError::Emsg(), XrdPollInfo::FD, XrdLink::ID, XrdPollInfo::inQ, XrdPollInfo::isEnabled, XrdPollInfo::Link, XrdSysMutex::Lock(), XrdPollInfo::Next, XrdPoll::PipeData::Parms, XrdPoll::PID, XrdPollInfo::PollEnt, XrdPoll::PollPipe, XrdPoll::PipeData::req, TRACEI, XrdSysMutex::UnLock(), and write.

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◆ Exclude()

void XrdPollPoll::Exclude ( XrdPollInfo pInfo)
protectedvirtual

Implements XrdPoll.

Definition at line 218 of file XrdPollPoll.icc.

219{
220 XrdSysSemaphore mySem(0);
221 PipeData cmdbuff[2];
222 int myerrno = 0;
223
224// Make sure this link is not enabled
225//
226 if (pInfo.isEnabled)
227 {Log.Emsg("Poll", "Detach of enabled link", pInfo.Link.ID);
228 Disable(pInfo);
229 }
230 else if (pInfo.inQ) dqLink(&pInfo);
231
232// Send a deatch request to the poller thread handling this link
233//
234 TRACEI(POLL, "sending poller " <<PID <<" detach for link " <<pInfo.FD);
235 cmdbuff[0].req = PipeData::RmFD;
236 cmdbuff[0].Parms.Arg.fd = pInfo.FD;
237 cmdbuff[0].Parms.Arg.ent = pInfo.PollEnt - PollTab;
238 cmdbuff[1].req = PipeData::Post;
239 cmdbuff[1].Parms.theSem = &mySem;
240 PollPipe.Lock();
241 if (write(CmdFD, &cmdbuff, sizeof(cmdbuff)) < 0) myerrno = errno;
243
244// Verify that all went well and if termination wanted, terminate the link
245//
246 if (myerrno) Log.Emsg("Poll", myerrno, "detach link", pInfo.Link.ID);
247 else mySem.Wait();
248}
void Disable(XrdPollInfo &pInfo, const char *etxt=0)

References XrdPoll::CmdFD, Disable(), XrdSysError::Emsg(), XrdPollInfo::FD, XrdLink::ID, XrdPollInfo::inQ, XrdPollInfo::isEnabled, XrdPollInfo::Link, XrdSysMutex::Lock(), XrdPoll::PipeData::Parms, XrdPoll::PID, XrdPollInfo::PollEnt, XrdPoll::PollPipe, XrdPoll::PipeData::req, TRACEI, XrdSysMutex::UnLock(), XrdSysSemaphore::Wait(), and write.

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◆ Include()

int XrdPollPoll::Include ( XrdPollInfo pInfo)
protectedvirtual

Implements XrdPoll.

Definition at line 89 of file XrdPollPoll.icc.

90{
91 struct pollfd *pfd;
92 int ptnum;
93
94// Lock down the poll data structure
95//
96 PollMutex.Lock();
97
98// Get the next entry to be used
99//
100 ptnum = 0;
101 while((ptnum < PollTNum) && (PollTab[ptnum].fd != -1)) ptnum++;
102
103// Make sure we have enough table entries to add this link
104//
105 if (ptnum > maxent)
106 {Log.Emsg("Attach","Attach",pInfo.Link.ID,"failed; poll table overflow.");
107 PollMutex.UnLock();
108 return 0;
109 }
110
111// Initialize the polltable entry
112//
113 pfd = &(PollTab[ptnum]);
114 pfd->fd = -pInfo.FD;
115 pfd->events = POLLIN | POLLRDNORM;
116 pfd->revents = 0;
117
118// Record relevant information in the link
119//
120 pInfo.PollEnt = pfd;
121 if (ptnum == PollTNum) PollTNum++;
122
123// All done
124//
125 PollMutex.UnLock();
126 return 1;
127}

References XrdSysError::Emsg(), XrdPollInfo::FD, XrdLink::ID, XrdPollInfo::Link, XrdSysMutex::Lock(), XrdPollInfo::PollEnt, and XrdSysMutex::UnLock().

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◆ Start()

void XrdPollPoll::Start ( XrdSysSemaphore syncp,
int &  rc 
)
virtual

Implements XrdPoll.

Definition at line 254 of file XrdPollPoll.icc.

255{
256 int numpolled, num2sched;
257 XrdJob *jfirst, *jlast;
258 XrdPollInfo *plp, *nlp, *pInfo;
259 XrdLink *lp;
260 short pollevents;
261 const short pollOK = POLLIN | POLLRDNORM;
262
263// Set up he first entry in the poll table to be our communications port
264//
265 PollTab[0].fd = ReqFD;
266 PollTab[0].events = pollOK;
267 PollTab[0].revents = 0;
268 PollTNum = 1;
269
270// Signal the caller to continue
271//
272 retcode = 0;
273 syncsem->Post();
274
275// Now do the main poll loop
276//
277 do {do {numpolled = poll(PollTab, PollTNum, -1);}
278 while(numpolled < 0 && (errno == EAGAIN || errno == EINTR));
279
280 // Check if we had a polling error
281 //
282 if (numpolled < 0)
283 {if (errno != EINTR) Restart(errno);
284 else numInterrupts++;
285 continue;
286 }
287 numEvents += numpolled;
288
289 // Check out base poll table entry, we can do this without a lock
290 //
291 if (PollTab[0].revents & pollOK)
292 {doRequests(numpolled);
293 if (--numpolled <= 0) continue;
294 }
295
296 // Checkout which links must be dispatched (do this locked)
297 //
298 PollMutex.Lock();
299 plp = 0; nlp = PollQ; jfirst = jlast = 0; num2sched = 0;
300 while ((pInfo = nlp) && numpolled > 0)
301 {if ((pollevents = pInfo->PollEnt->revents))
302 {pInfo->PollEnt->fd = -pInfo->PollEnt->fd;
303 if (plp) nlp = plp->Next = pInfo->Next;
304 else nlp = PollQ = pInfo->Next;
305 numpolled--; pInfo->inQ = false;
306 if (!(pollevents & pollOK))
307 Finish(*pInfo, Poll2Text(pollevents));
308 lp = &(pInfo->Link);
309 if (!(pInfo->isEnabled))
310 Log.Emsg("Poll", "Disabled event occurred for", lp->ID);
311 else {pInfo->isEnabled = false;
312 lp->NextJob = jfirst; jfirst = (XrdJob *)lp;
313 if (!jlast) jlast=(XrdJob *)lp;
314 num2sched++;
315 continue;
316 }
317 }
318 plp = pInfo; nlp = pInfo->Next;
319 }
320 if (numpolled) Recover(numpolled);
321 PollMutex.UnLock();
322
323 // Schedule the polled links
324 //
325 if (num2sched == 1) Sched.Schedule(jfirst);
326 else if (num2sched) Sched.Schedule(num2sched, jfirst, jlast);
327 } while(1);
328}
XrdJob * NextJob
Definition XrdJob.hh:46
int numInterrupts
Definition XrdPoll.hh:134
int ReqFD
Definition XrdPoll.hh:118
int numEvents
Definition XrdPoll.hh:133
static char * Poll2Text(short events)
Definition XrdPoll.cc:272

References XrdSysError::Emsg(), XrdPoll::Finish(), XrdLink::ID, XrdPollInfo::inQ, XrdPollInfo::isEnabled, XrdPollInfo::Link, XrdSysMutex::Lock(), XrdPollInfo::Next, XrdJob::NextJob, XrdPoll::numEvents, XrdPoll::numInterrupts, XrdPoll::Poll2Text(), XrdPollInfo::PollEnt, XrdSysSemaphore::Post(), XrdPoll::ReqFD, XrdScheduler::Schedule(), and XrdSysMutex::UnLock().

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The documentation for this class was generated from the following files: