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This implements a full memory barrier. On ubuntu amd64 with results in an 'mfence' instruction. This is required to syncronization between threads, where there's typically only one write of a memory that should be synced between all threads with the barrier. Much more details can be found here: https://gcc.gnu.org/onlinedocs/gcc-7.3.0/gcc/_005f_005fatomic-Builtins.html#g_t_005f_005fatomic-Builtins https://gcc.gnu.org/onlinedocs/gcc-7.3.0/gcc/_005f_005fsync-Builtins.html#g_t_005f_005fsync-Builtins The main one we use seems to be in C11 via stdatomic.h, the oldest fallback is __sync_synchronize(), which is available since 2005 in gcc. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org> |
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| .. | ||
| aio.h | ||
| capability.h | ||
| dir.h | ||
| filesys.h | ||
| glob.h | ||
| gssapi.h | ||
| iconv.h | ||
| kerberos.h | ||
| locale.h | ||
| network.h | ||
| nis.h | ||
| passwd.h | ||
| readline.h | ||
| README | ||
| select.h | ||
| shmem.h | ||
| syslog.h | ||
| terminal.h | ||
| threads.h | ||
| time.h | ||
| wait.h | ||
| wscript_configure | ||
This directory contains wrappers around logical groups of system include files. The idea is to avoid #ifdef blocks in the main code, and instead put all the necessary conditional includes in subsystem specific header files in this directory.