* cygwin.din (sem_unlink): Export.

* posix_ipc.cc: Include thread.h and semaphore.h.  Remove TODO
	comment.
	(ipc_names): Add max_len member.  Set to maximum length of the path
	before tacking on the prefix path.  Set prefix path for named semaphors
	to /dev/shm, as on Linux.
	(enum ipc_type_t): Change sem to semaphore to avoid name conflicts.
	(check_path): Detect empty paths.  Use ipc_names's max_len member.
	Use __small_sprintf to create full object path name.  Special case
	semaphores.
	(ipc_cond_init): Drop superfluous strcpy.
	(class ipc_flock): New class to simplify file locking in subsequent
	code.
	(struct mq_hdr): Raise size of mqh_uname to allow adding a unique
	LUID to the name.
	(mq_open): Fix formatting.  Create unique synchronization object names
	using AllocateLocallyUniqueId.
	(struct sem_finfo): New structure defining named semaphore file content.
	(sem_open): Move here.  Rework implementation to allow kernel
	persistent implementation of POSIX named semaphores.
	(_sem_close): Implement sem_close.
	(sem_close): Move here.  Just call _sem_close with do_close parameter
	set to true.
	(sem_unlink): New function.
	* pthread.cc (mangle_sem_name): Remove.
	(sem_open): Move to posix_ipc.cc.
	(sem_close): Ditto.
	* syscalls.cc (close_all_files): Call semaphore::terminate here.
	* thread.cc: Fix formatting.  Rearrange semaphore functions so that
	they are close together.
	(semaphore::semaphore): Rework to play nicely with new named semaphore
	implementation.
	(semaphore::_terminate): Call _sem_close if semaphore is a named
	semaphore.
	(semaphore::destroy): Don't destroy named semaphores.  Return EINVAL
	instead.
	(semaphore::close): Only destroy named semaphores.  Return EINVAL
	otherwise.
	(semaphore::open): Rework to play nicely with new named semaphore
	implementation.  Loop through existing semaphores to be able to
	return same sem_t pointer as a former call on the same named semaphore.
	(semaphore::getinternal): New function called from _sem_close.
	* thread.h (class List): Make mx and head public.
	(class semaphore): Fix formatting.  Align method declarations with
	implementation in thread.cc.  Add members used for named semaphores.
	(semaphore::terminate): New static method.
	* include/semaphore.h: Redefine SEM_FAILED.  Fix formatting.
	(sem_unlink): Add declaration.
	* include/cygwin/version.h: Bump API minor number.

winsup/cygwin/thread.h

@@ -1,6 +1,6 @@
 /* thread.h: Locking and threading module definitions
 
-   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
+   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007 Red Hat, Inc.
 
    Written by Marco Fuykschot <marco@ddi.nl>
    Major update 2001 Robert Collins <rbtcollins@hotmail.com>
@@ -208,15 +208,15 @@ template <class list_node> class List
     mx.unlock ();
   }
 
+  fast_mutex mx;
+  list_node *head;
+
 protected:
   void mx_init ()
   {
     if (!mx.init ())
       api_fatal ("Could not create mutex for list synchronisation.");
   }
-
-  fast_mutex mx;
-  list_node *head;
 };
 
 class pthread_key: public verifyable_object
@@ -633,23 +633,30 @@ class semaphore: public verifyable_object
 public:
   static bool is_good_object(sem_t const *);
   /* API calls */
-  static int init (sem_t * sem, int pshared, unsigned int value);
-  static int destroy (sem_t * sem);
-  static sem_t *open (const char *name, int oflag, mode_t mode,
-		      unsigned int value);
-  static int wait (sem_t * sem);
-  static int post (sem_t * sem);
-  static int getvalue (sem_t * sem, int *sval);
-  static int trywait (sem_t * sem);
-  static int timedwait (sem_t * sem, const struct timespec *abstime);
+  static int init (sem_t *sem, int pshared, unsigned int value);
+  static int destroy (sem_t *sem);
+  static sem_t *open (unsigned long long hash, LUID luid, int fd, int oflag,
+		      mode_t mode, unsigned int value, bool &wasopen);
+  static int close (sem_t *sem);
+  static int wait (sem_t *sem);
+  static int post (sem_t *sem);
+  static int getvalue (sem_t *sem, int *sval);
+  static int trywait (sem_t *sem);
+  static int timedwait (sem_t *sem, const struct timespec *abstime);
+
+  static int getinternal (sem_t *sem, int *sfd, unsigned long long *shash,
+			  LUID *sluid, unsigned int *sval);
 
   HANDLE win32_obj_id;
   int shared;
   long currentvalue;
-  char *name;
+  int fd;
+  unsigned long long hash;
+  LUID luid;
+  sem_t *sem;
 
   semaphore (int, unsigned int);
-  semaphore (const char *name, int oflag, mode_t mode, unsigned int value);
+  semaphore (unsigned long long, LUID, int, sem_t *, int, mode_t, unsigned int);
   ~semaphore ();
 
   class semaphore * next;
@@ -658,6 +665,10 @@ public:
     semaphores.fixup_after_fork ();
     semaphores.for_each (&semaphore::_fixup_after_fork);
   }
+  static void terminate ()
+  {
+    semaphores.for_each (&semaphore::_terminate);
+  }
 
 private:
   int _wait ();
@@ -667,6 +678,7 @@ private:
   int _timedwait (const struct timespec *abstime);
 
   void _fixup_after_fork ();
+  void _terminate ();
 
   static List<semaphore> semaphores;
 };