To help cases where kernel drivers do not
implement poll events correctly.
Bug: 316829336
Test: boot
Change-Id: Ibad16a8e8e061a5be8cede7e8680c3095d6e6f32
When enabling DEBUG_CALLBACKS , compiler complains
for the undeclared identifier 'fd'.
Fix by removing undeclared objects.
Change-Id: I751a9ef9d8843350105acd6a30645f897050ffa4
I've seen these fixed before, so we compile the debug modes
now.
Bug: 244325464
Test: 'm libutils_test_compile'
Change-Id: I4271909e81893ad448bc46b8a3a567a84c40f8a3
Previously, Looper internally kept track of the requests to add fds
using the fd value itself. It used an internal sequence number
associated with each request to add a callback to avoid a situation
where a callback is unexpectedly called. However, since it used the fd
value rather than the sequence number to register events into epoll,
there was still a way where unintended hangups could occur.
This exact sequence of events caused unintended behavior in Looper:
- An fd (FD) is added to the looper.
- Looper registers FD into epoll using its FD number.
- FD is closed.
- A hangup event arrives from epoll_wait while the Looper is polling.
Looper is waiting for the lock to process the callback for FD, because
it is blocked by:
- A new fd is created and added to the looper. Since the lowest number
fd is reused, this new fd has the same value as FD.
- The poll request for Looper is now unblocked, so it looks up the
callback associated with FD to process the hangup.
- Since FD is already associated with the new callback, the new callback
is called unintentionally.
This CL uses the sequence number to register fds into epoll. That way,
when we get a hangup from epoll that is associated with a sequence
number, there is no way an unexpected callback will called.
This CL also adds a test to verify this behavior. Due to the
nondeterministic nature of this multi-thread scenario, the test verifies
this scenario repeatedly. Without the fix in Looper, the test is flaky,
but should never fail after the fix.
Bug: 195020232
Bug: 189135695
Test: atest libutils_test --rerun-until-failure
Ignore-AOSP-First: Topic CL aosp/1799831 has a merge conflict with
internal master, resolved in ag/15613419.
Change-Id: Ib4edab7f2407adaef6a1708b29bc52634f25dbb6
When enabling DEBUG_POLL_AND_WAKE or DEBUG_CALLBACKS, compiler complains
for the undefined PRI* fprintf format constants.
Fix by including the missing cinttypes.
Test: m
Bug: none
Change-Id: I0a7b5b45bd274eefa9644cba491a8dc28f1992ff
The question arose on the bug of whether this is a legit errno or just
a stale value.
Bug: http://b/129139241
Test: ran tests
Change-Id: I486176496028f04d4fcccdd0b29a3df6b13849c9
Switch Looper to using unique_fd for its owned file descriptors, to
benefit from fdsan.
Bug: http://b/111560345
Test: treehugger
Change-Id: I8efff7741ed19fd71f82f7e604b4f1c66fc5ea2b
moved Foo.h as first include of Foo.cpp, and
removed redundant includes.
Made NativeHandle non virtual.
Test: run & compile
Bug: n/a
Change-Id: I37fa746cd42c9ba23aba181f84cb6c619386406a
Should use android/log.h instead of cutils/log.h as a good example
to all others. Adjust header order to comply with Android Coding
standards.
Test: Compile
Bug: 26552300
Bug: 31289077
Change-Id: I2c9cbbbd64d8dccf2d44356361d9742e4a9b9031
system/core/include is included in the global include path using
-isystem, which hides all warnings. Fix warnings in libutils
headers in preparation for moving from -isystem to -I.
- Fix implicit cast from int64_t to long in Condition.h. Remove
the __LP64__ check and always compare against LONG_MAX before
casting.
- Fix implicit cast from size_t to ssize_t in KeyedVector.h
- Fix -Wshadow-field-in-constructor warnings in Looper.h and RefBase.h
- Move destructors for MessageHandler and LooperCallback to Looper.cpp
and ReferenceRenamer and VirtualLightRefBase to RefBase.cpp to prevent
vtables in every compilation unit.
- Declare template variables in Singleton.h
- Fix old-style casts in StrongPointer.h and TypeHelpers.h
- Use template metaprogramming in TypeHelpers.h to avoid warnings on
memmove on non-trivial types.
- Add an assignment operator to key_value_pair_t to complete
rule-of-three
- Use memcpy instead of dereferencing a reinterpret_casted pointer to
treat the bits of a float or double as int32_t or int64_t
- Escape unicode sequences inside doxygen comments between \code and
\endcode
- Remove WIN32 ZD definition in Compat.h, %zd works fine with mingw
- Fix WIN32 printf warnings in Filemap.cpp
- Initialize mNullValue with 0 in LruCache.h, some of the tests use a
non-pointer type for TValue.
Test: m -j native
Bug: 31492149
Change-Id: I385a05a3ca01258e44fe3b37ef77e4aaff547b26
If wake() fails to write to mWakeEventFd, the looper is
screwed. This is really a fatal, unrecoverable error,
so treat it as such.
This is possibly an explaination for the unexplained
random ANRs
Change-Id: I5af3e013493b475d8e902d8ee6340f331e5d86c8
It's easier for people to debug, and side-steps the problem that errno
values differ between architectures.
Bug: http://b/17458391
Change-Id: I1db9b2cbb653839d3936b91e37e5cff02671318a
Sometimes it seems like we can get into a situation where we are
unable to remove an fd from the epoll set but it keeps sending us
events anyhow. Defensively rebuild the epoll set in this case
to prevent us from spinning forever.
Bug: 21271428
Change-Id: I5607e565f2e12460d7113a1f62a70d38d334e271
When a file descriptor is closed before removing it from the
epoll set, it will normally be removed automatically from the
epoll set by the kernel. However if there exists a duplicate
then the original file descriptor may remain in the set and
continue to receive events until all duplicates have been closed.
Unfortunately due to kernel limitations we need to rebuild the epoll
set from scratch because it may contain an old file handle that we are
now unable to remove since its file descriptor is no longer valid.
No such problem would have occurred if we were using the poll system
call instead, but that approach carries others disadvantages.
Bug: 19715279
Change-Id: If1ab8ebda0825755a416d513e888942a02ee3948
Added code to protect against situations that may occur when a
Looper callback has the side-effect of closing the file descriptor that
it is watching before it returns. This code pattern is very
convenient for implementation but it does expose issues in how
the list of callbacks is maintained. In particular, we
need to watch out for file descriptors which have been reused.
This change may resolve previously unexplained ANRs associated with
log messages such as: "Error modifying epoll events for fd 44, errno=2"
Bug: 10349083
Change-Id: I20eedf6ffbdeda382653ca0104962505194741b0
The loop isn't technically idle at this time, it's just checking
whether any file descriptors have pending events. However it's
still a good signal as to whether the loop is alive.
Bug: 19532373
Change-Id: I555c473e70ffd8a56e1b10aa60026eb674a16de9
