Mercurial > hg > nginx
view misc/README @ 6080:4296627f385a stable-1.6
Core: fixed a race resulting in extra sem_post()'s.
The mtx->wait counter was not decremented if we were able to obtain the lock
right after incrementing it. This resulted in unneeded sem_post() calls,
eventually leading to EOVERFLOW errors being logged, "sem_post() failed
while wake shmtx (75: Value too large for defined data type)".
To close the race, mtx->wait is now decremented if we obtain the lock right
after incrementing it in ngx_shmtx_lock(). The result can become -1 if a
concurrent ngx_shmtx_unlock() decrements mtx->wait before the added code does.
However, that only leads to one extra iteration in the next call of
ngx_shmtx_lock().
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Wed, 04 Feb 2015 16:22:43 +0300 |
parents | 09dbd363050a |
children | 001beb963d86 |
line wrap: on
line source
make -f misc/GNUmakefile release the required tools: *) xsltproc to build CHANGES, *) java and XSLScript ( http://pault.com/pault/XSLScript/ ) to build XSLTs from XSLScript sources. make -f misc/GNUmakefile icons the required tool: *) netpbm to create Win32 icons from xpm sources.