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Bug 955888. Part 4: In chaos mode, put new sockets at a random position in the poll list. r=jduell

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This means sockets are processed in a semi-random (but consistent) order during
a poll.

--HG--
extra : rebase_source : 46d1e0bcdde73fc2e0886294f90df4b8eb93af62
This commit is contained in:
Robert O'Callahan 2014-03-03 18:12:32 +13:00
parent dfca86f550
commit 03b64d9405
1 changed files with 14 additions and 4 deletions
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18
netwerk/base/src/nsSocketTransportService2.cpp
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@ -21,6 +21,8 @@
#include "mozilla/Preferences.h"
#include "mozilla/Likely.h"
#include "mozilla/PublicSSL.h"
#include "mozilla/ChaosMode.h"
#include "mozilla/PodOperations.h"
#include "nsThreadUtils.h"
#include "nsIFile.h"
@ -227,12 +229,20 @@ nsSocketTransportService::AddToPollList(SocketContext *sock)
}
}
mActiveList[mActiveCount] = *sock;
uint32_t newSocketIndex = mActiveCount;
if (ChaosMode::isActive()) {
newSocketIndex = ChaosMode::randomUint32LessThan(mActiveCount + 1);
PodMove(mActiveList + newSocketIndex + 1, mActiveList + newSocketIndex,
mActiveCount - newSocketIndex);
PodMove(mPollList + newSocketIndex + 2, mPollList + newSocketIndex + 1,
mActiveCount - newSocketIndex);
}
mActiveList[newSocketIndex] = *sock;
mActiveCount++;
mPollList[mActiveCount].fd = sock->mFD;
mPollList[mActiveCount].in_flags = sock->mHandler->mPollFlags;
mPollList[mActiveCount].out_flags = 0;
mPollList[newSocketIndex + 1].fd = sock->mFD;
mPollList[newSocketIndex + 1].in_flags = sock->mHandler->mPollFlags;
mPollList[newSocketIndex + 1].out_flags = 0;
SOCKET_LOG((" active=%u idle=%u\n", mActiveCount, mIdleCount));
return NS_OK;