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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-01-19 09:26:31 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-28 15:55:56 -0300 |
commit | c32c868ab8b2b95724550d0130782c0767fc3bab (patch) | |
tree | 53b43a7f006fe8f549affb6b6d4d24b808a75465 /sysdeps/unix/sysv/linux/aarch64 | |
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 'sysdeps/unix/sysv/linux/aarch64')
-rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 5ff33f6..4736a59 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2369,6 +2369,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 _Fork F GLIBC_2.34 __libc_start_main F GLIBC_2.34 __mq_open_2 F GLIBC_2.34 __pthread_cleanup_routine F |