tree 9bba80c02f293fcf759bd9b2fe0004f99ac96fae
parent 7356c2554e33cf16768616e8e3ae4a4f5a5aac17
author Rich Felker <dalias@aerifal.cx> 1375561650 -0400
committer Rich Felker <dalias@aerifal.cx> 1375561650 -0400

add system for resetting TLS to initial values

this is needed for reused threads in the SIGEV_THREAD timer
notification system, and could be reused elsewhere in the future if
needed, though it should be refactored for such use.

for static linking, __init_tls.c is simply modified to export the TLS
info in a structure with external linkage, rather than using statics.
this perhaps makes the code more clear, since the statics were poorly
named for statics. the new __reset_tls.c is only linked if it is used.

for dynamic linking, the code is in dynlink.c. sharing code with
__copy_tls is not practical since __reset_tls must also re-zero
thread-local bss.