PollableEvent::PollableEvent()
: mWriteFD(nullptr)
, mReadFD(nullptr)
, mSignaled(false)
{
MOZ_COUNT_CTOR(PollableEvent);
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
// create pair of prfiledesc that can be used as a poll()ble
// signal. on windows use a localhost socket pair, and on
// unix use a pipe.
#ifdef USEPIPE
SOCKET_LOG(("PollableEvent() using pipe\n"));
if (PR_CreatePipe(&mReadFD, &mWriteFD) == PR_SUCCESS) {
// make the pipe non blocking. NSPR asserts at
// trying to use SockOpt here
PROsfd fd = PR_FileDesc2NativeHandle(mReadFD);
int flags = fcntl(fd, F_GETFL, 0);
(void)fcntl(fd, F_SETFL, flags | O_NONBLOCK);
fd = PR_FileDesc2NativeHandle(mWriteFD);
flags = fcntl(fd, F_GETFL, 0);
(void)fcntl(fd, F_SETFL, flags | O_NONBLOCK);
} else {
mReadFD = nullptr;
mWriteFD = nullptr;
SOCKET_LOG(("PollableEvent() pipe failed\n"));
}
#else
SOCKET_LOG(("PollableEvent() using socket pair\n"));
PRFileDesc *fd[2];
LazyInitSocket();
if (NewTCPSocketPair(fd)) {
mReadFD = fd[0];
mWriteFD = fd[1];
// compatibility with LSPs such as McAfee that assume a NSPR
// layer for read ala the nspr Pollable Event - Bug 698882. This layer is a nop.
PRFileDesc *topLayer =
PR_CreateIOLayerStub(sPollableEventLayerIdentity,
sPollableEventLayerMethodsPtr);
if (topLayer) {
if (PR_PushIOLayer(fd[0], PR_TOP_IO_LAYER, topLayer) == PR_FAILURE) {
topLayer->dtor(topLayer);
} else {
SOCKET_LOG(("PollableEvent() nspr layer ok\n"));
mReadFD = topLayer;
}
}
} else {
SOCKET_LOG(("PollableEvent() socketpair failed\n"));
}
#endif
if (mReadFD && mWriteFD) {
// prime the system to deal with races invovled in [dc]tor cycle
SOCKET_LOG(("PollableEvent() ctor ok\n"));
mSignaled = true;
PR_Write(mWriteFD, "I", 1);
}
}
PollableEvent::PollableEvent()
: mWriteFD(nullptr)
, mReadFD(nullptr)
, mSignaled(false)
{
MOZ_COUNT_CTOR(PollableEvent);
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
// create pair of prfiledesc that can be used as a poll()ble
// signal. on windows use a localhost socket pair, and on
// unix use a pipe.
#ifdef USEPIPE
SOCKET_LOG(("PollableEvent() using pipe\n"));
if (PR_CreatePipe(&mReadFD, &mWriteFD) == PR_SUCCESS) {
// make the pipe non blocking. NSPR asserts at
// trying to use SockOpt here
PROsfd fd = PR_FileDesc2NativeHandle(mReadFD);
int flags = fcntl(fd, F_GETFL, 0);
(void)fcntl(fd, F_SETFL, flags | O_NONBLOCK);
fd = PR_FileDesc2NativeHandle(mWriteFD);
flags = fcntl(fd, F_GETFL, 0);
(void)fcntl(fd, F_SETFL, flags | O_NONBLOCK);
} else {
mReadFD = nullptr;
mWriteFD = nullptr;
SOCKET_LOG(("PollableEvent() pipe failed\n"));
}
#else
SOCKET_LOG(("PollableEvent() using socket pair\n"));
PRFileDesc *fd[2];
LazyInitSocket();
// Try with a increased recv buffer first (bug 1248358).
if (NewTCPSocketPair(fd, true)) {
mReadFD = fd[0];
mWriteFD = fd[1];
// If the previous fails try without recv buffer increase (bug 1305436).
} else if (NewTCPSocketPair(fd, false)) {
mReadFD = fd[0];
mWriteFD = fd[1];
// If both fail, try the old version.
} else if (PR_NewTCPSocketPair(fd) == PR_SUCCESS) {
mReadFD = fd[0];
mWriteFD = fd[1];
PRSocketOptionData socket_opt;
DebugOnly<PRStatus> status;
socket_opt.option = PR_SockOpt_NoDelay;
socket_opt.value.no_delay = true;
PR_SetSocketOption(mWriteFD, &socket_opt);
PR_SetSocketOption(mReadFD, &socket_opt);
socket_opt.option = PR_SockOpt_Nonblocking;
socket_opt.value.non_blocking = true;
status = PR_SetSocketOption(mWriteFD, &socket_opt);
MOZ_ASSERT(status == PR_SUCCESS);
status = PR_SetSocketOption(mReadFD, &socket_opt);
MOZ_ASSERT(status == PR_SUCCESS);
}
if (mReadFD && mWriteFD) {
// compatibility with LSPs such as McAfee that assume a NSPR
// layer for read ala the nspr Pollable Event - Bug 698882. This layer is a nop.
PRFileDesc *topLayer =
PR_CreateIOLayerStub(sPollableEventLayerIdentity,
sPollableEventLayerMethodsPtr);
if (topLayer) {
if (PR_PushIOLayer(fd[0], PR_TOP_IO_LAYER, topLayer) == PR_FAILURE) {
topLayer->dtor(topLayer);
} else {
SOCKET_LOG(("PollableEvent() nspr layer ok\n"));
mReadFD = topLayer;
}
}
} else {
SOCKET_LOG(("PollableEvent() socketpair failed\n"));
}
#endif
if (mReadFD && mWriteFD) {
// prime the system to deal with races invovled in [dc]tor cycle
SOCKET_LOG(("PollableEvent() ctor ok\n"));
mSignaled = true;
PR_Write(mWriteFD, "I", 1);
}
}
