_FD_LOCK/UNLOCK() is libpthread specific and not needed for librthread, so

isolate its usage to libpthread only and replace with generic non-static
mutex support in the one place it is needed:
 - remove _FD_LOCK/UNLOCK from lseek and ftruncate in libc and make the
   functions weak so that libpthread can override with its own new
   versions that do the locking.
 - remove _thread_fd_lock/unlock() weak functions from libc and adjust
   libpthread for the change.
 - add generic _thread_mutex_lock/unlock/destroy() weak functions in libc
   to support non-static mutexes in libc and add libpthread and librthread
   implementations for them. libc can utilize non-static mutexes via the
   new _MUTEX_LOCK/UNLOCK/DESTROY() macros. Actually these new macros can
   support both static and non-static mutexes but currently only using
   them for non-static.
 - make opendir/closedir/readdir/readdir_r/seekdir/telldir() thread-safe
   for both thread libraries by using a non-static mutex in the struct
   _dirdesc (typedef DIR), utilizing it in the *dir functions and remove
   remaining and incorrect _FD_LOCK/UNLOCK() use in libc.
 - add comments to both thread libraries to indicate libc depends on the
   current implementation of static mutex initialization. suggested by
   marc@
 - major bump libc and libpthread due to function removal, structure
   change and weak symbol conversions.
okay marc@, tedu@

1 files changed, 9 insertions, 12 deletions

diff --git a/lib/libc/sys/ftruncate.c b/lib/libc/sys/ftruncate.c
index c1722580859..d0f5e9837c4 100644
--- a/lib/libc/sys/ftruncate.c
+++ b/lib/libc/sys/ftruncate.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ftruncate.c,v 1.14 2005/08/08 08:05:37 espie Exp $ */
+/*	$OpenBSD: ftruncate.c,v 1.15 2007/06/05 18:11:48 kurt Exp $ */
 /*
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -28,27 +28,24 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/types.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 #include "thread_private.h"
 
 register_t __syscall(quad_t, ...);
 
+/* ftruncate is weak to support libpthread locking */
+
+WEAK_PROTOTYPE(ftruncate);
+
+WEAK_ALIAS(ftruncate);
+
 /*
  * This function provides 64-bit offset padding that
  * is not supplied by GCC 1.X but is supplied by GCC 2.X.
  */
 int
-ftruncate(int fd, off_t length)
+WEAK_NAME(ftruncate)(int fd, off_t length)
 {
-	int retval;
-
-	if (_FD_LOCK(fd, FD_RDWR, NULL) != 0) {
-		retval = -1;
-	} else {
-		retval = __syscall((quad_t)SYS_ftruncate, fd, 0, length);
-		_FD_UNLOCK(fd, FD_RDWR);
-	}
-	return retval;
+	return (__syscall((quad_t)SYS_ftruncate, fd, 0, length));
 }