KAWASHIMA Takahiro 7d4167430c [gcov] Fix simultaneous .gcda creation/lock ... Fixes PR45673 The commit 9180c14fe4 (D76206) resolved only a part of the problem of concurrent .gcda file creation. It ensured that only one process creates the file but did not ensure that the process locks the file first. If not, the process which created the file may clobber the contents written by a process which locked the file first. This is the cause of PR45673. This commit prevents the clobbering by revising the assumption that a process which creates the file locks the file first. Regardless of file creation, a process which locked the file first uses fwrite (new_file==1) and other processes use mmap (new_file==0). I also tried to keep the creation/first-lock process same by using mkstemp/link/unlink but the code gets long. This commit is more simple. Note: You may be confused with other changes which try to resolve concurrent file access. My understanding is (may not be correct): D76206: Resolve race of .gcda file creation (but not lock) This one: Resolve race of .gcda file creation and lock D54599: Same as D76206 but abandoned? D70910: Resolve race of multi-threaded counter flushing D74953: Resolve counter sharing between parent/children processes D78477: Revision of D74953 Differential Revision: https://reviews.llvm.org/D79556		2020-05-13 13:03:03 +09:00
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asan	[ASan] Fix issue where system log buffer was not cleared after reporting an issue.	2020-03-26 10:56:17 -07:00
BlocksRuntime
builtins	[builtins] Support architectures with 16-bit int	2020-04-26 01:22:10 +02:00
cfi
crt	[cmake] Strip quotes in compiler-rt/lib/crt; error if checks fail	2020-03-09 15:52:39 -07:00
dfsan	[dfsan] Remove realloc from done_abilist.txt	2020-05-05 22:32:45 -07:00
fuzzer	[libFuzzer] Fix typo in seed_inputs flag description. NFC.	2020-04-09 13:54:07 +02:00
gwp_asan	[GWP-ASan] Use functions in backtrace test, not line numbers.	2020-03-26 10:10:24 -07:00
hwasan	[hwasan] Untag destination address in hwasan_posix_memalign.	2020-05-08 16:35:48 -07:00
interception
lsan	[lsan] Support LeakSanitizer runtime on Fuchsia	2020-01-28 11:34:53 -08:00
msan	[MSan] Enable for SystemZ	2020-04-16 12:15:01 +02:00
profile	[gcov] Fix simultaneous .gcda creation/lock	2020-05-13 13:03:03 +09:00
safestack
sanitizer_common	[hwasan] Fix allocator alignment.	2020-05-11 15:45:42 -07:00
scudo	Add vendor identity check for Hygon Dhyana processor in Scudo	2020-05-11 09:17:57 -07:00
stats
tsan	[compile-rt] Reduce #ifdef noise for ptrauth	2020-05-11 09:47:21 -07:00
ubsan	[compile-rt] Reduce #ifdef noise for ptrauth	2020-05-11 09:47:21 -07:00
ubsan_minimal
xray	[xray] Preserve x8 in trampoline on AArch64	2020-04-27 14:57:26 -04:00
CMakeLists.txt	scudo: Add support for diagnosing memory errors when memory tagging is enabled.	2020-04-17 17:26:30 -07:00