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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-01-19 09:26:31 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-28 15:55:56 -0300 |
| commit | c32c868ab8b2b95724550d0130782c0767fc3bab (patch) | |
| tree | 53b43a7f006fe8f549affb6b6d4d24b808a75465 /posix/Makefile | |
| parent | dd45734e322a03287d34d8af9b7da7b35cfddb8e (diff) | |
| download | glibc-c32c868ab8b2b95724550d0130782c0767fc3bab.zip glibc-c32c868ab8b2b95724550d0130782c0767fc3bab.tar.gz glibc-c32c868ab8b2b95724550d0130782c0767fc3bab.tar.bz2 | |
posix: Add _Fork [BZ #4737]
Austin Group issue 62 [1] dropped the async-signal-safe requirement
for fork and provided a async-signal-safe _Fork replacement that
does not run the atfork handlers. It will be included in the next
POSIX standard.
It allow to close a long standing issue to make fork AS-safe (BZ#4737).
As indicated on the bug, besides the internal lock for the atfork
handlers itself; there is no guarantee that the handlers itself will
not introduce more AS-safe issues.
The idea is synchronize fork with the required internal locks to allow
children in multithread processes to use mostly of standard function
(even though POSIX states only AS-safe function should be used). On
signal handles, _Fork should be used intead and only AS-safe functions
should be used.
For testing, the new tst-_Fork only check basic usage. I also added
a new tst-mallocfork3 which uses the same strategy to check for
deadlock of tst-mallocfork2 but using threads instead of subprocesses
(and it does deadlock if it replaces _Fork with fork).
[1] https://austingroupbugs.net/view.php?id=62
Diffstat (limited to 'posix/Makefile')
| -rw-r--r-- | posix/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/posix/Makefile b/posix/Makefile index 3bd7d60..e91ea25 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -130,7 +130,7 @@ test-srcs := globtest tests += wordexp-test tst-exec tst-spawn tst-spawn2 tst-spawn3 endif ifeq (yesyes,$(build-shared)$(have-thread-library)) -tests += tst-getopt-cancel +tests += tst-getopt-cancel tst-_Fork endif tests-static = tst-exec-static tst-spawn-static tests += $(tests-static) @@ -299,6 +299,7 @@ $(objpfx)ptestcases.h: PTESTS PTESTS2C.sed $(objpfx)runptests.o: $(objpfx)ptestcases.h $(objpfx)tst-getopt-cancel: $(shared-thread-library) +$(objpfx)tst-_Fork: $(shared-thread-library) test-xfail-annexc = yes $(objpfx)annexc.out: $(objpfx)annexc |