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author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-12-20 15:12:48 +0100 |
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committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-12-20 15:12:48 +0100 |
commit | c813dae5d8e469262f96b1cda0191ea076f10809 (patch) | |
tree | 5c1a6ddd1ba30aaab17172593300b6a2dcd383ed /sysdeps/unix/sysv/linux/posix_fallocate64.c | |
parent | 8d71242eb7a85860bc4f7cef5463ad61e2ea19b2 (diff) | |
download | glibc-c813dae5d8e469262f96b1cda0191ea076f10809.tar.gz glibc-c813dae5d8e469262f96b1cda0191ea076f10809.tar.xz glibc-c813dae5d8e469262f96b1cda0191ea076f10809.zip |
S390: Use C11-like atomics instead of plain memory accesses in lock elision code.
This uses atomic operations to access lock elision metadata that is accessed concurrently (ie, adapt_count fields). The size of the data is less than a word but accessed only with atomic loads and stores. See also x86 commit ca6e601a9d4a72b3699cca15bad12ac1716bf49a: "Use C11-like atomics instead of plain memory accesses in x86 lock elision." ChangeLog: * sysdeps/unix/sysv/linux/s390/elision-lock.c (__lll_lock_elision): Use atomics to load / store adapt_count. * sysdeps/unix/sysv/linux/s390/elision-trylock.c (__lll_trylock_elision): Likewise.
Diffstat (limited to 'sysdeps/unix/sysv/linux/posix_fallocate64.c')
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