Fix socket timeout logic.
parent
1ae9412488
commit
21483a0ace
|
@ -1,4 +1,3 @@
|
|||
// vim:set sw=4 sts=4 et cin:
|
||||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
@ -52,6 +51,51 @@ Atomic<PRThread*, Relaxed> gSocketThread;
|
|||
uint32_t nsSocketTransportService::gMaxCount;
|
||||
PRCallOnceType nsSocketTransportService::gMaxCountInitOnce;
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
bool
|
||||
nsSocketTransportService::SocketContext::IsTimedOut(PRIntervalTime now) const
|
||||
{
|
||||
return TimeoutIn(now) == 0;
|
||||
}
|
||||
|
||||
void
|
||||
nsSocketTransportService::SocketContext::StartTimeout(PRIntervalTime now)
|
||||
{
|
||||
if (!mPollStartEpoch) {
|
||||
mPollStartEpoch = now;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
nsSocketTransportService::SocketContext::StopTimeout()
|
||||
{
|
||||
mPollStartEpoch = 0;
|
||||
}
|
||||
|
||||
void
|
||||
nsSocketTransportService::SocketContext::ResetTimeout()
|
||||
{
|
||||
if (mPollStartEpoch && mHandler->mPollTimeout == UINT16_MAX) {
|
||||
mPollStartEpoch = 0;
|
||||
}
|
||||
}
|
||||
|
||||
PRIntervalTime
|
||||
nsSocketTransportService::SocketContext::TimeoutIn(PRIntervalTime now) const
|
||||
{
|
||||
if (mHandler->mPollTimeout == UINT16_MAX || !mPollStartEpoch) {
|
||||
return NS_SOCKET_POLL_TIMEOUT;
|
||||
}
|
||||
|
||||
PRIntervalTime elapsed = (now - mPollStartEpoch);
|
||||
PRIntervalTime timeout = PR_SecondsToInterval(mHandler->mPollTimeout);
|
||||
|
||||
if (elapsed >= timeout) {
|
||||
return 0;
|
||||
}
|
||||
return timeout - elapsed;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
// ctor/dtor (called on the main/UI thread by the service manager)
|
||||
|
||||
|
@ -189,7 +233,7 @@ nsSocketTransportService::AttachSocket(PRFileDesc *fd, nsASocketHandler *handler
|
|||
SocketContext sock;
|
||||
sock.mFD = fd;
|
||||
sock.mHandler = handler;
|
||||
sock.mElapsedTime = 0;
|
||||
sock.mPollStartEpoch = 0;
|
||||
|
||||
nsresult rv = AddToIdleList(&sock);
|
||||
if (NS_SUCCEEDED(rv))
|
||||
|
@ -275,6 +319,8 @@ nsSocketTransportService::AddToPollList(SocketContext *sock)
|
|||
PodMove(mPollList + newSocketIndex + 2, mPollList + newSocketIndex + 1,
|
||||
mActiveCount - newSocketIndex);
|
||||
}
|
||||
|
||||
sock->StartTimeout(PR_IntervalNow());
|
||||
mActiveList[newSocketIndex] = *sock;
|
||||
mActiveCount++;
|
||||
|
||||
|
@ -399,34 +445,32 @@ nsSocketTransportService::GrowIdleList()
|
|||
}
|
||||
|
||||
PRIntervalTime
|
||||
nsSocketTransportService::PollTimeout()
|
||||
nsSocketTransportService::PollTimeout(PRIntervalTime now)
|
||||
{
|
||||
if (mActiveCount == 0)
|
||||
if (mActiveCount == 0) {
|
||||
return NS_SOCKET_POLL_TIMEOUT;
|
||||
}
|
||||
|
||||
// compute minimum time before any socket timeout expires.
|
||||
uint32_t minR = UINT16_MAX;
|
||||
PRIntervalTime minR = NS_SOCKET_POLL_TIMEOUT;
|
||||
for (uint32_t i=0; i<mActiveCount; ++i) {
|
||||
const SocketContext &s = mActiveList[i];
|
||||
// mPollTimeout could be less than mElapsedTime if setTimeout
|
||||
// was called with a value smaller than mElapsedTime.
|
||||
uint32_t r = (s.mElapsedTime < s.mHandler->mPollTimeout)
|
||||
? s.mHandler->mPollTimeout - s.mElapsedTime
|
||||
: 0;
|
||||
if (r < minR)
|
||||
PRIntervalTime r = s.TimeoutIn(now);
|
||||
if (r < minR) {
|
||||
minR = r;
|
||||
}
|
||||
}
|
||||
// nsASocketHandler defines UINT16_MAX as do not timeout
|
||||
if (minR == UINT16_MAX) {
|
||||
|
||||
if (minR == NS_SOCKET_POLL_TIMEOUT) {
|
||||
SOCKET_LOG(("poll timeout: none\n"));
|
||||
return NS_SOCKET_POLL_TIMEOUT;
|
||||
}
|
||||
SOCKET_LOG(("poll timeout: %lu\n", minR));
|
||||
return PR_SecondsToInterval(minR);
|
||||
SOCKET_LOG(("poll timeout: %lu seconds\n", PR_IntervalToSeconds(minR)));
|
||||
return minR;
|
||||
}
|
||||
|
||||
int32_t
|
||||
nsSocketTransportService::Poll(uint32_t *interval)
|
||||
nsSocketTransportService::Poll(PRIntervalTime ts)
|
||||
{
|
||||
PRPollDesc *pollList;
|
||||
uint32_t pollCount;
|
||||
|
@ -441,7 +485,7 @@ nsSocketTransportService::Poll(uint32_t *interval)
|
|||
mPollList[0].out_flags = 0;
|
||||
pollList = mPollList;
|
||||
pollCount = mActiveCount + 1;
|
||||
pollTimeout = pendingEvents ? PR_INTERVAL_NO_WAIT : PollTimeout();
|
||||
pollTimeout = pendingEvents ? PR_INTERVAL_NO_WAIT : PollTimeout(ts);
|
||||
}
|
||||
else {
|
||||
// no pollable event, so busy wait...
|
||||
|
@ -454,18 +498,14 @@ nsSocketTransportService::Poll(uint32_t *interval)
|
|||
pendingEvents ? PR_INTERVAL_NO_WAIT : PR_MillisecondsToInterval(25);
|
||||
}
|
||||
|
||||
PRIntervalTime ts = PR_IntervalNow();
|
||||
|
||||
SOCKET_LOG((" timeout = %i milliseconds\n",
|
||||
PR_IntervalToMilliseconds(pollTimeout)));
|
||||
|
||||
int32_t rv = PR_Poll(pollList, pollCount, pollTimeout);
|
||||
|
||||
PRIntervalTime passedInterval = PR_IntervalNow() - ts;
|
||||
|
||||
SOCKET_LOG((" ...returned after %i milliseconds\n",
|
||||
PR_IntervalToMilliseconds(passedInterval)));
|
||||
PR_IntervalToMilliseconds(PR_IntervalNow() - ts)));
|
||||
|
||||
*interval = PR_IntervalToSeconds(passedInterval);
|
||||
return rv;
|
||||
}
|
||||
|
||||
|
@ -811,13 +851,8 @@ nsSocketTransportService::Run()
|
|||
// make sure the pseudo random number generator is seeded on this thread
|
||||
srand(static_cast<unsigned>(PR_Now()));
|
||||
|
||||
int numberOfPendingEvents;
|
||||
|
||||
// If there is too many pending events queued, we will run some poll()
|
||||
// between them.
|
||||
for (;;) {
|
||||
bool pendingEvents = false;
|
||||
numberOfPendingEvents = 0;
|
||||
|
||||
do {
|
||||
DoPollIteration();
|
||||
|
@ -838,7 +873,6 @@ nsSocketTransportService::Run()
|
|||
TimeStamp eventQueueStart = TimeStamp::NowLoRes();
|
||||
do {
|
||||
NS_ProcessNextEvent(mRawThread);
|
||||
numberOfPendingEvents++;
|
||||
pendingEvents = false;
|
||||
mRawThread->HasPendingEvents(&pendingEvents);
|
||||
} while (pendingEvents && mServingPendingQueue &&
|
||||
|
@ -915,6 +949,9 @@ nsSocketTransportService::DoPollIteration()
|
|||
{
|
||||
SOCKET_LOG(("STS poll iter\n"));
|
||||
|
||||
// Freeze "now" for list updates and polling.
|
||||
PRIntervalTime now = PR_IntervalNow();
|
||||
|
||||
int32_t i, count;
|
||||
//
|
||||
// poll loop
|
||||
|
@ -932,16 +969,18 @@ nsSocketTransportService::DoPollIteration()
|
|||
mActiveList[i].mHandler->mCondition,
|
||||
mActiveList[i].mHandler->mPollFlags));
|
||||
//---
|
||||
if (NS_FAILED(mActiveList[i].mHandler->mCondition))
|
||||
if (NS_FAILED(mActiveList[i].mHandler->mCondition)) {
|
||||
DetachSocket(mActiveList, &mActiveList[i]);
|
||||
else {
|
||||
} else {
|
||||
uint16_t in_flags = mActiveList[i].mHandler->mPollFlags;
|
||||
if (in_flags == 0)
|
||||
if (in_flags == 0) {
|
||||
MoveToIdleList(&mActiveList[i]);
|
||||
else {
|
||||
} else {
|
||||
// update poll flags
|
||||
mPollList[i+1].in_flags = in_flags;
|
||||
mPollList[i+1].out_flags = 0;
|
||||
// Active polling entry; start timeout.
|
||||
mActiveList[i].StartTimeout(now);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
@ -952,10 +991,11 @@ nsSocketTransportService::DoPollIteration()
|
|||
mIdleList[i].mHandler->mCondition,
|
||||
mIdleList[i].mHandler->mPollFlags));
|
||||
//---
|
||||
if (NS_FAILED(mIdleList[i].mHandler->mCondition))
|
||||
if (NS_FAILED(mIdleList[i].mHandler->mCondition)) {
|
||||
DetachSocket(mIdleList, &mIdleList[i]);
|
||||
else if (mIdleList[i].mHandler->mPollFlags != 0)
|
||||
} else if (mIdleList[i].mHandler->mPollFlags != 0) {
|
||||
MoveToPollList(&mIdleList[i]);
|
||||
}
|
||||
}
|
||||
|
||||
SOCKET_LOG((" calling PR_Poll [active=%u idle=%u]\n", mActiveCount, mIdleCount));
|
||||
|
@ -969,55 +1009,44 @@ nsSocketTransportService::DoPollIteration()
|
|||
#endif
|
||||
|
||||
// Measures seconds spent while blocked on PR_Poll
|
||||
uint32_t pollInterval = 0;
|
||||
int32_t n = 0;
|
||||
|
||||
if (!gIOService->IsNetTearingDown()) {
|
||||
// Let's not do polling during shutdown.
|
||||
#if defined(XP_WIN)
|
||||
StartPolling();
|
||||
#endif
|
||||
n = Poll(&pollInterval);
|
||||
n = Poll(now);
|
||||
#if defined(XP_WIN)
|
||||
EndPolling();
|
||||
#endif
|
||||
}
|
||||
|
||||
// Refresh when "now" is for following checks.
|
||||
now = PR_IntervalNow();
|
||||
|
||||
if (n < 0) {
|
||||
SOCKET_LOG((" PR_Poll error [%d] os error [%d]\n", PR_GetError(),
|
||||
PR_GetOSError()));
|
||||
}
|
||||
else {
|
||||
} else {
|
||||
//
|
||||
// service "active" sockets...
|
||||
//
|
||||
uint32_t numberOfOnSocketReadyCalls = 0;
|
||||
for (i=0; i<int32_t(mActiveCount); ++i) {
|
||||
PRPollDesc &desc = mPollList[i+1];
|
||||
SocketContext &s = mActiveList[i];
|
||||
if (n > 0 && desc.out_flags != 0) {
|
||||
s.mElapsedTime = 0;
|
||||
s.StopTimeout();
|
||||
s.mHandler->OnSocketReady(desc.fd, desc.out_flags);
|
||||
numberOfOnSocketReadyCalls++;
|
||||
}
|
||||
// check for timeout errors unless disabled...
|
||||
else if (s.mHandler->mPollTimeout != UINT16_MAX) {
|
||||
// update elapsed time counter
|
||||
// (NOTE: We explicitly cast UINT16_MAX to be an unsigned value
|
||||
// here -- otherwise, some compilers will treat it as signed,
|
||||
// which makes them fire signed/unsigned-comparison build
|
||||
// warnings for the comparison against 'pollInterval'.)
|
||||
if (MOZ_UNLIKELY(pollInterval >
|
||||
static_cast<uint32_t>(UINT16_MAX) -
|
||||
s.mElapsedTime))
|
||||
s.mElapsedTime = UINT16_MAX;
|
||||
else
|
||||
s.mElapsedTime += uint16_t(pollInterval);
|
||||
// check for timeout expiration
|
||||
if (s.mElapsedTime >= s.mHandler->mPollTimeout) {
|
||||
s.mElapsedTime = 0;
|
||||
s.mHandler->OnSocketReady(desc.fd, -1);
|
||||
numberOfOnSocketReadyCalls++;
|
||||
}
|
||||
} else if (s.IsTimedOut(now)) {
|
||||
// Socket timed out; disengage.
|
||||
s.StopTimeout();
|
||||
s.mHandler->OnSocketReady(desc.fd, -1);
|
||||
} else {
|
||||
// We may have recorded a timeout start on a socket and subsequently
|
||||
// set it to not time out. Check the socket and reset the timestamp
|
||||
// in this case to keep our states predictable.
|
||||
s.ResetTimeout();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -19,7 +19,6 @@
|
|||
#include "mozilla/Mutex.h"
|
||||
#include "mozilla/net/DashboardTypes.h"
|
||||
#include "mozilla/Atomics.h"
|
||||
#include "mozilla/TimeStamp.h"
|
||||
#include "nsITimer.h"
|
||||
#include "mozilla/UniquePtr.h"
|
||||
#include "PollableEvent.h"
|
||||
|
@ -167,7 +166,33 @@ private:
|
|||
{
|
||||
PRFileDesc *mFD;
|
||||
nsASocketHandler *mHandler;
|
||||
uint16_t mElapsedTime; // time elapsed w/o activity
|
||||
PRIntervalTime mPollStartEpoch; // Epoch timestamp when we started to poll this socket
|
||||
|
||||
public:
|
||||
// Helper functions implementing a timeout mechanism.
|
||||
|
||||
// Returns true if the socket has not been signalled in more than the desired
|
||||
// timeout for this socket (mHandler->mPollTimeout).
|
||||
bool IsTimedOut(PRIntervalTime now) const;
|
||||
|
||||
// Records the epoch timestamp we started polling this socket. If the epoch is already
|
||||
// recorded, then it does nothing (i.e. does not re-arm) so it's safe to call whenever
|
||||
// this socket is put into the active polling list.
|
||||
void StartTimeout(PRIntervalTime now);
|
||||
|
||||
// Turns off the timout calculation.
|
||||
void StopTimeout();
|
||||
|
||||
// Returns the number of intervals from "now" after which this socket will timeout,
|
||||
// or 0 (zero) when it has already timed out. Returns NS_SOCKET_POLL_TIMEOUT
|
||||
// when there is no timeout set on the socket.
|
||||
PRIntervalTime TimeoutIn(PRIntervalTime now) const;
|
||||
|
||||
// When a socket timeout is set to not time out and later set again to time out, it
|
||||
// is possible that mPollStartEpoch is not reset in-between. We have to manually
|
||||
// call this on every iteration over sockets to ensure the epoch timestamp is reset
|
||||
// and our socket bookkeeping remains accurate.
|
||||
void ResetTimeout();
|
||||
};
|
||||
|
||||
SocketContext *mActiveList; /* mListSize entries */
|
||||
|
@ -203,10 +228,10 @@ private:
|
|||
|
||||
PRPollDesc *mPollList; /* mListSize + 1 entries */
|
||||
|
||||
PRIntervalTime PollTimeout(); // computes ideal poll timeout
|
||||
PRIntervalTime PollTimeout(PRIntervalTime now); // computes ideal poll timeout
|
||||
nsresult DoPollIteration();
|
||||
// perfoms a single poll iteration
|
||||
int32_t Poll(uint32_t *interval);
|
||||
int32_t Poll(PRIntervalTime now);
|
||||
// calls PR_Poll. the out param
|
||||
// interval indicates the poll
|
||||
// duration in seconds.
|
||||
|
|
Loading…
Reference in New Issue