Re: [patch, 4.7] libitm: Fix lost wake-up in serial lock.

2012-03-13 Thread Jakub Jelinek
On Tue, Mar 13, 2012 at 09:54:36AM -0700, Richard Henderson wrote: > On 03/10/12 09:43, Torvald Riegel wrote: > > libitm: Fix lost wake-up in serial lock. > > > > PR libitm/52526 > > * config/linux/rwlock.cc (GTM::gtm_rwlock::read_lock): Fix lost > > wak

Re: [patch, 4.7] libitm: Fix lost wake-up in serial lock.

2012-03-13 Thread Richard Henderson
On 03/10/12 09:43, Torvald Riegel wrote: > libitm: Fix lost wake-up in serial lock. > > PR libitm/52526 > * config/linux/rwlock.cc (GTM::gtm_rwlock::read_lock): Fix lost > wake-up. Ok. Jakub needs to approve this for 4.7.0; otherwise ok for 4.7.1. r~

[patch, 4.7] libitm: Fix lost wake-up in serial lock.

2012-03-10 Thread Torvald Riegel
This patch fixes PR52526, a lost wake-up in libitm (ie, one ore more threads could hang and not get woken up anymore). The problem was missing handling of one corner case in the futex-based serial lock implementation (config/linux/rwlock.cc, read_lock()): Multiple readers would set READERS to 1 an