o Add a mutex (sb_mtx) to struct sockbuf. This protects the data in a
socket buffer. The mutex in the receive buffer also protects the data
in struct socket.
o Determine the lock strategy for each members in struct socket.
o Lock down the following members:
- so_count
- so_options
- so_linger
- so_state
o Remove *_locked() socket APIs. Make the following socket APIs
touching the members above now require a locked socket:
- sodisconnect()
- soisconnected()
- soisconnecting()
- soisdisconnected()
- soisdisconnecting()
- sofree()
- soref()
- sorele()
- sorwakeup()
- sotryfree()
- sowakeup()
- sowwakeup()
Reviewed by: alfred
Seigo Tanimura (tanimura) posted the initial delta.
I've polished it quite a bit reducing the need for locking and
adapting it for KSE.
Locks:
1 mutex in each filedesc
protects all the fields.
protects "struct file" initialization, while a struct file
is being changed from &badfileops -> &pipeops or something
the filedesc should be locked.
1 mutex in each struct file
protects the refcount fields.
doesn't protect anything else.
the flags used for garbage collection have been moved to
f_gcflag which was the FILLER short, this doesn't need
locking because the garbage collection is a single threaded
container.
could likely be made to use a pool mutex.
1 sx lock for the global filelist.
struct file * fhold(struct file *fp);
/* increments reference count on a file */
struct file * fhold_locked(struct file *fp);
/* like fhold but expects file to locked */
struct file * ffind_hold(struct thread *, int fd);
/* finds the struct file in thread, adds one reference and
returns it unlocked */
struct file * ffind_lock(struct thread *, int fd);
/* ffind_hold, but returns file locked */
I still have to smp-safe the fget cruft, I'll get to that asap.
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.
Sorry john! (your next MFC will be a doosie!)
Reviewed by: peter@freebsd.org, dillon@freebsd.org
X-MFC after: ha ha ha ha
opt_global.h and opt_svr4.h, instead of from the command line. This
brings them in-line with most of the rest of the kernel.
svr4_ioctl.c has also failed to compile with debugging for a while
now; fixed by adding systm.h and socketvar.
Some svr4 source files are automatically generated from syscalls.master;
these have been committed as consequential changes, otherwise everyone
will have to "make svr4_sysent.c".
Changes:
sys/svr4/svr4.h include opt_global.h and opt_svr4.h
sys/svr4/svr4_ioctl.c include svr4.h, sys/systm.h and sys/socketvar.h
sys/svr4/svr4_ipc.c include svr4.h
sys/svr4/svr4_resource.c include svr4.h
sys/svr4/svr4_socket.c include svr4.h
sys/svr4/svr4_ttold.c include svr4.h
sys/svr4/syscalls.master include svr4.h
sys/svr4/svr4_syscallnames.c dependent on syscalls.master
sys/svr4/svr4_sysent.c dependent on syscalls.master
sys/svr4/svr4_syscall.h dependent on syscalls.master
sys/svr4/svr4_proto.h dependent on syscalls.master
sys/modules/svr4/Makefile create opt_global.h and opt_svr4.h
