tree 8b632cea0832373b9cb843427bb5976b3668f1a2
parent f374358414812d3e5a45ba75a2b1926693924420
author Elliott Hughes <enh@google.com> 1421806145 -0800
committer Elliott Hughes <enh@google.com> 1421865210 -0800

Implement __fsetlocking.

The old __isthreaded hack was never very useful on Android because all user
code runs in a VM where there are lots of threads running. But __fsetlocking
lets a caller say "I'll worry about the locking for this FILE*", which is
useful for the normal case where you don't share a FILE* between threads
so you don't need any locking.

Bug: 17154740
Bug: 18593728
Change-Id: I2a8dddc29d3edff39a3d7d793387f2253608a68d