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Tom Cherry 61910f123f liblog: remove Rwlocks for logd_socket and pmsg_fd 
These historically used atomics to manage their lifetime.  They were
unfortunately unsafe and later replace with a RwLock.  A lock is
also problematic as it is too heavy weight for the typical use case
and implies that logging is neither async nor fork safe.

This change returns us to using atomics with two key changes:
1) compare_exchange_strong() is used instead of atomic_exchange().
   The latter has a race condition where a separate thread could have
   read the atomic value into a register, while the thread performing
   the atomic_exchange closes that FD.  The new code only changes the
   FD in the atomic if it is uninitialized.
2) Using the fact that DGRAM sockets can have connect() called on them
   multiple times, it uses a single logd_socket for the duration of
   the program.

These sockets are thread/async/fork safely created and accessed.

The one caveat is __android_log_close(), which is intended only to be
used by zygote when it is single threaded and is therefore not thread
safe.  It will close this socket and reset the underlying variable,
such that the next log message will go through the above
initialization.

Bug: 65062446
Test: logging works, logging unit tests
Test: new unit test
Merged-In: Ia4dbf7479dbe50683d124558ab2f83bff53b8f5f
Change-Id: Ia4dbf7479dbe50683d124558ab2f83bff53b8f5f
(cherry picked from commit 7acfba274c)
2020-04-29 08:39:26 -07:00
adb adb: Avoid extra string construction 2020-04-21 20:34:44 -07:00
base Merge "base: reimagine line splitting in logger.cpp" into rvc-dev 2020-04-29 15:05:36 +00:00
bootstat Improve logging in bootstat. 2020-04-02 20:07:04 +01:00
cli-test cli-test: a tool for testing command-line programs. 2019-12-13 12:23:51 -08:00
code_coverage build code_coverage.policy with Android.bp 2020-02-11 10:33:38 -08:00
cpio Switch from dist-for-goals to dist in Android.bp 2018-11-19 23:06:12 -08:00
debuggerd Remove use of static libdexfile to avoid linking in ART internal code. 2020-03-24 21:48:00 +00:00
deprecated-adf remove deprecated bp 'subdirs' 2020-01-14 12:18:40 -08:00
diagnose_usb Set apex_available property 2020-04-20 16:07:35 +09:00
fastboot Rename vts-core to vts 2020-04-06 16:11:29 -07:00
fs_mgr Merge "Moves some shared_libs to static_libs for vts_libsnapshot_test." into rvc-dev 2020-04-28 23:14:33 +00:00
gatekeeperd Remove libhwbinder/libhidltransport deps 2019-09-05 14:17:42 -07:00
healthd BatteryMonitor: report current_now in uA 2020-04-09 14:41:51 -07:00
include Move android_filesystem_config.h => fs_config.h 2017-08-02 16:31:19 -07:00
init Merge "Add /mnt/androidwritable for MOUNT_EXTERNAL_ANDROID_WRITABLE apps" into rvc-dev 2020-04-21 11:08:07 +00:00
janitors Add the two best build system janitors. 2019-03-25 10:25:13 -07:00
libappfuse Close /dev/fuse FD before calling onClosed 2019-05-31 17:06:52 +01:00
libasyncio Set apex_available property 2020-04-20 16:07:35 +09:00
libbacktrace Set apex_available property 2020-04-20 16:06:02 +09:00
libbinderwrapper Make libbinderwrapper available in /vendor partition 2018-04-06 08:41:21 +09:00
libcrypto_utils Set apex_available property 2020-04-20 16:06:02 +09:00
libcutils Set apex_available property 2020-04-20 16:06:02 +09:00
libdiskconfig Rename target.linux[_x86[_64]] to target.linux_glibc[_x86[_64]] 2017-10-02 10:44:29 -07:00
libgrallocusage Replace -Weverything with -Wextra 2019-11-08 13:09:00 -08:00
libkeyutils Refactor mini-keyctl and split a static library 2019-09-26 10:45:38 -07:00
liblog liblog: remove Rwlocks for logd_socket and pmsg_fd 2020-04-29 08:39:26 -07:00
libmodprobe first_stage_init: load modules in modules.load.recovery in recovery 2020-04-08 10:49:13 -07:00
libnetutils add nodad argument to ifc_act_on_address() and add it to header file 2020-01-26 06:35:30 -08:00
libpackagelistparser Add require_root to adbd_test and libpackagelistparser_test 2019-09-24 09:13:32 -07:00
libprocessgroup Add vts_processgroup_validate_test to vts suite 2020-04-27 13:34:20 -07:00
libprocinfo libprocinfo: remove error msg for unknown process state. 2020-01-17 15:55:13 -08:00
libqtaguid Redirect qtaguid native call to netd fwmark client 2017-11-09 18:02:22 -08:00
libsparse Make ramdisk_available. 2020-01-22 16:47:14 -08:00
libstats Add require root to libstats tests 2020-04-24 10:44:25 -07:00
libsuspend Remove libsuspend from VNDK. 2018-08-14 13:39:55 -07:00
libsync Rename # vndk tag to # llndk 2019-11-13 14:32:44 +09:00
libsystem Set apex_available property 2020-04-20 16:06:02 +09:00
libsysutils NetlinkEvent - ignore captive portal and pref64 nd user opts 2020-04-03 01:01:15 +00:00
libunwindstack Remove use of static libdexfile to avoid linking in ART internal code. 2020-03-24 21:48:00 +00:00
libusbhost Revert "Mark libs as double_loadable" 2019-03-11 14:10:34 +00:00
libutils Set apex_available property 2020-04-20 16:06:02 +09:00
libvndksupport remove deprecated bp 'subdirs' 2020-01-14 12:18:40 -08:00
libziparchive Handle the invalid timestamp in zipfile 2020-04-16 04:34:00 +00:00
llkd llkd: Print thread group before panic the kernel 2020-04-27 16:11:53 +08:00
logcat logcatd: unset pinning log files 2020-04-23 13:53:37 -07:00
logd liblog: support extended logger_entry headers 2020-04-10 11:48:06 -07:00
logwrapper logwrap: add missing O_CLOEXEC 2020-02-27 09:41:24 -08:00
property_service Rename ro.device_owner system property 2020-02-19 10:34:36 +00:00
qemu_pipe Set apex_available property 2020-04-20 16:07:35 +09:00
reboot adb: replace reboot service with exec of /system/bin/reboot. 2019-10-23 14:33:36 -07:00
rootdir Merge "Make /data/apex/active world readable" into rvc-dev 2020-04-24 21:44:40 +00:00
run-as run-as: improve diagnostics on failure. 2019-03-13 11:16:03 -07:00
sdcard Move layout_version to /data/misc/installd 2019-08-21 10:12:18 -07:00
set-verity-state set-verity-state: Link to libfs_mgr_binder. 2019-12-30 13:42:57 -08:00
shell_and_utilities Update shell_and_utilities docs for R. 2020-01-16 15:54:16 -08:00
storaged storaged: ignore SIGPIPE 2020-03-18 13:53:15 -07:00
toolbox Control audio HAL services in start/stop 2020-04-23 10:42:55 -07:00
trusty Merge "First working version of the confirmationui HAL service" 2020-01-21 16:40:03 +00:00
usbd Remove libhwbinder/libhidltransport deps 2019-09-05 14:17:42 -07:00
watchdogd Move watchdogd out of init 2018-08-02 12:25:58 -07:00
.clang-format Add a 2 width option of clang format. 2017-03-10 13:01:39 -08:00
.clang-format-2 Move clang-formats to build. 2019-01-18 14:26:33 -08:00
.clang-format-4 Move clang-formats to build. 2019-01-18 14:26:33 -08:00
.gitignore Ignore adb/*.pyc files 2015-08-11 12:59:58 -07:00
Android.bp remove deprecated bp 'subdirs' 2020-01-14 12:18:40 -08:00
CleanSpec.mk snapshotctl don't auto-merge. 2020-03-05 08:41:42 -08:00
MODULE_LICENSE_APACHE2 auto import from //depot/cupcake/@135843 2013-07-30 13:56:49 -07:00
NOTICE Fix omission in NOTICE file. 2013-07-30 13:56:55 -07:00
OWNERS Move per-file OWNERS directives to their directories. 2018-06-06 11:49:40 +09:00
PREUPLOAD.cfg Add a PREUPLOAD.cfg file to run git-clang-format on every commit 2017-03-08 16:51:26 +08:00
TEST_MAPPING Move adb RSA utilities into its own library. 2020-02-11 20:49:20 -08:00