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
..
asan	Try to make duplicate_os_log_reports.cpp more reliable.	2020-05-04 13:49:55 -07:00
BlocksRuntime
builtins	[builtins] Support architectures with 16-bit int	2020-04-26 01:22:10 +02:00
cfi
crt
dfsan	[dfsan] Fix a bug in strcasecmp() and strncasecmp(): Compare the lowercase versions of the characters when choosing a return value.	2020-04-20 17:13:40 -07:00
fuzzer	[libFuzzer] Fix denominator in the "inputs have DFT" log line.	2020-02-19 11:05:14 -08:00
gwp_asan	[GWP-ASan] Crash Handler API.	2020-02-05 15:39:17 -08:00
hwasan	[hwasan] Fix allocator alignment.	2020-05-11 15:45:42 -07:00
interception
lsan	[lsan] Fix warnings lit config	2020-05-05 22:42:14 -07:00
msan	Fix MSan test use-after-dtor.cpp under new pass manager	2020-05-08 09:12:41 -07:00
profile	[gcov] Fix simultaneous .gcda creation/lock	2020-05-13 13:03:03 +09:00
safestack
sanitizer_common	[sanitizer] Enable whitelist/blacklist in new PM	2020-05-10 02:34:29 +00:00
scudo
shadowcallstack
tsan	[Darwin] Fix symbolization for recent simulator runtimes.	2020-04-17 15:08:14 -07:00
ubsan	[UBSan] Fix vptr checks on arm64e	2020-04-16 16:09:05 -07:00
ubsan_minimal
xray
.clang-format
CMakeLists.txt
lit.common.cfg.py	[compiler-rt][test] Add feature host-byteorder-big-endian	2020-05-10 11:02:25 -07:00
lit.common.configured.in	build: use Python3 for compiler-rt	2020-04-28 17:29:04 +00:00